class.ilObjSurvey.php

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<?php
/* Copyright (c) 1998-2010 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once "./Services/Object/classes/class.ilObject.php";

class ilObjSurvey extends ilObject
{
        const STATUS_OFFLINE = 0;
        const STATUS_ONLINE = 1;        
        
        const EVALUATION_ACCESS_OFF = 0;
        const EVALUATION_ACCESS_ALL = 1;
        const EVALUATION_ACCESS_PARTICIPANTS = 2;
        
        const INVITATION_OFF = 0;
        const INVITATION_ON = 1;
        
        const MODE_UNLIMITED = 0;
        const MODE_PREDEFINED_USERS = 1;
        
        const ANONYMIZE_OFF = 0; // personalized, no codes
        const ANONYMIZE_ON = 1; // anonymized, codes
        const ANONYMIZE_FREEACCESS = 2; // anonymized, no codes
        const ANONYMIZE_CODE_ALL = 3; // personalized, codes
        
        const QUESTIONTITLES_HIDDEN = 0;
        const QUESTIONTITLES_VISIBLE = 1;       
        
        var $survey_id;

        var $author;

        var $introduction;

        var $outro;

        var $status;

        var $evaluation_access;

        var $start_date;

        var $end_date;

        var $questions;

        var $invitation;

        var $invitation_mode;
        
        var $anonymize;

        var $display_question_titles;

        var $surveyCodeSecurity;
        
        var $mailnotification;
        var $mailaddresses;
        var $mailparticipantdata;
        var $template_id;
        var $pool_usage;

        protected $log;
        
        protected $activation_visibility;
        protected $activation_starting_time;
        protected $activation_ending_time;
        
        // 360° 
        protected $mode_360; // [bool]
        protected $mode_360_self_eval; // [bool]
        protected $mode_360_self_appr; // [bool]
        protected $mode_360_self_rate; // [bool]
        protected $mode_360_results; // [int]
        protected $mode_360_skill_service; // [bool]
        
        const RESULTS_360_NONE = 0;
        const RESULTS_360_OWN = 1;
        const RESULTS_360_ALL = 2;
        
        // reminder/notification        
        protected $reminder_status; // [bool]
        protected $reminder_start; // [ilDate]
        protected $reminder_end; // [ilDate]
        protected $reminder_frequency; // [int]
        protected $reminder_target; // [int]
        protected $reminder_last_sent; // [bool]
        protected $reminder_tmpl; // [int]
        protected $tutor_ntf_status; // [bool]
        protected $tutor_ntf_recipients; // [array]
        protected $tutor_ntf_target; // [int]
        
        protected $view_own_results; // [bool]
        protected $mail_own_results; // [bool]
        protected $mail_confirmation; // [bool]
        
        protected $anon_user_list; // [bool]
        
        const NOTIFICATION_PARENT_COURSE = 1;
        const NOTIFICATION_INVITED_USERS = 2;
        

        function __construct($a_id = 0,$a_call_by_reference = true)
        {
                global $ilUser, $lng;
                
                $this->type = "svy";    
                $this->survey_id = -1;
                $this->introduction = "";
                $this->outro = $lng->txt("survey_finished");
                $this->author = $ilUser->getFullname();
                $this->status = self::STATUS_OFFLINE;
                $this->evaluation_access = self::EVALUATION_ACCESS_OFF;
                $this->questions = array();
                $this->invitation = self::INVITATION_OFF;
                $this->invitation_mode = self::MODE_PREDEFINED_USERS;
                $this->anonymize = self::ANONYMIZE_OFF;
                $this->display_question_titles = self::QUESTIONTITLES_VISIBLE;
                $this->surveyCodeSecurity = TRUE;
                $this->template_id = NULL;
                $this->pool_usage = true;
                $this->log = ilLoggerFactory::getLogger("svy");

                parent::__construct($a_id,$a_call_by_reference);
        }

        function create($a_upload = false)
        {
                parent::create();
                if(!$a_upload)
                {
                        $this->createMetaData();
                }
        }

        function createMetaData()
        {
                parent::createMetaData();
                $this->saveAuthorToMetadata();
        }

        function update()
        {
                $this->updateMetaData();

                if (!parent::update())
                {
                        return false;
                }

                // put here object specific stuff
                
                return true;
        }

        function createReference() 
        {
                $result = parent::createReference();
                $this->saveToDb();
                return $result;
        }

        public function read()
        {
                parent::read();
                $this->loadFromDb();
        }
        
        function addQuestion($question_id)
        {
                array_push($this->questions, $question_id);
        }
        
        function delete()
        {
                if ($this->countReferences() == 1)
                {
                        $this->deleteMetaData();

                        // Delete all survey questions, constraints and materials
                        foreach ($this->questions as $question_id)
                        {
                                $this->removeQuestion($question_id);
                        }
                        $this->deleteSurveyRecord();

                        ilUtil::delDir($this->getImportDirectory());
                }

                $remove = parent::delete();

                // always call parent delete function first!!
                if (!$remove)
                {
                        return false;
                }
                return true;
        }
        
        function deleteSurveyRecord()
        {
                global $ilDB;
                
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_svy WHERE survey_id = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );

                $result = $ilDB->queryF("SELECT questionblock_fi FROM svy_qblk_qst WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                $questionblocks = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        array_push($questionblocks, $row["questionblock_fi"]);
                }
                if (count($questionblocks))
                {
                        $affectedRows = $ilDB->manipulate("DELETE FROM svy_qblk WHERE " . $ilDB->in('questionblock_id', $questionblocks, false, 'integer'));
                }
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk_qst WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                $this->deleteAllUserData();

                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_anonymous WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                
                // delete export files
                $svy_data_dir = ilUtil::getDataDir()."/svy_data";
                $directory = $svy_data_dir."/svy_".$this->getId();
                if (is_dir($directory))
                {
                        ilUtil::delDir($directory);
                }

                include_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");
                $mobs = ilObjMediaObject::_getMobsOfObject("svy:html", $this->getId());
                // remaining usages are not in text anymore -> delete them
                // and media objects (note: delete method of ilObjMediaObject
                // checks whether object is used in another context; if yes,
                // the object is not deleted!)
                foreach($mobs as $mob)
                {
                        ilObjMediaObject::_removeUsage($mob, "svy:html", $this->getId());
                        $mob_obj = new ilObjMediaObject($mob);
                        $mob_obj->delete();
                }
        }
        
        function deleteAllUserData()
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT finished_id FROM svy_finished WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                $active_array = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        array_push($active_array, $row["finished_id"]);
                }

                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_finished WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );

                foreach ($active_array as $active_fi)
                {
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_answer WHERE active_fi = %s",
                                array('integer'),
                                array($active_fi)
                        );
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_times WHERE finished_fi = %s",
                                array('integer'),
                                array($active_fi)
                        );
                }
                
                include_once "Services/Object/classes/class.ilObjectLP.php";
                $lp_obj = ilObjectLP::getInstance($this->getId());
                $lp_obj->resetLPDataForCompleteObject();
        }
        
        function removeSelectedSurveyResults($finished_ids)
        {
                global $ilDB;
                
                $user_ids[] = array();
                
                foreach ($finished_ids as $finished_id)
                {
                        $result = $ilDB->queryF("SELECT finished_id FROM svy_finished WHERE finished_id = %s",
                                array('integer'),
                                array($finished_id)
                        );
                        $row = $ilDB->fetchAssoc($result);
                        
                        if($row["user_fi"])
                        {
                                $user_ids[] = $row["user_fi"];
                        }

                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_answer WHERE active_fi = %s",
                                array('integer'),
                                array($row["finished_id"])
                        );

                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_finished WHERE finished_id = %s",
                                array('integer'),
                                array($finished_id)
                        );

                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_times WHERE finished_fi = %s",
                                array('integer'),
                                array($row["finished_id"])
                        );
                }
                
                if(sizeof($user_ids))
                {
                        include_once "Services/Object/classes/class.ilObjectLP.php";
                        $lp_obj = ilObjectLP::getInstance($this->getId());
                        $lp_obj->resetLPDataForUserIds($user_ids);
                }
        }
        
        function &getSurveyParticipants($finished_ids = null, $force_non_anonymous = false)
        {
                global $ilDB;
                
                $sql = "SELECT * FROM svy_finished".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer");
                if($finished_ids)
                {
                        $sql .= " AND ".$ilDB->in("finished_id", $finished_ids, "", "integer");
                }
                
                $result = $ilDB->query($sql);
                $participants = array();
                if ($result->numRows() > 0)
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                $userdata = $this->getUserDataFromActiveId($row["finished_id"], $force_non_anonymous);
                                $userdata["finished"] = (bool)$row["state"];
                                $userdata["finished_tstamp"] = $row["tstamp"];
                                $participants[$userdata["sortname"] . $userdata["active_id"]] = $userdata;
                        }
                }
                return $participants;
        }

        function isComplete()
        {
                if (($this->getTitle()) and (count($this->questions)))
                {
                        return 1;
                } 
                        else 
                {
                        return 0;
                }
        }

        function saveCompletionStatus() 
        {
                global $ilDB;
                
                $complete = 0;
                if ($this->isComplete()) 
                {
                        $complete = 1;
                }
    if ($this->getSurveyId() > 0) 
                {
                        $affectedRows = $ilDB->manipulateF("UPDATE svy_svy SET complete = %s, tstamp = %s WHERE survey_id = %s",
                                array('text','integer','integer'),
                                array($this->isComplete(), time(), $this->getSurveyId())
                        );
                }
        }

        function duplicateQuestionForSurvey($question_id, $a_force = false)
        {
                global $ilUser;
                
                $questiontype = $this->getQuestionType($question_id);
                $question_gui = $this->getQuestionGUI($questiontype, $question_id);

                // check if question is a pool question at all, if not do nothing
                if($this->getId() == $question_gui->object->getObjId() &&  !$a_force)
                {
                        return $question_id;
                }

                $duplicate_id = $question_gui->object->duplicate(true, "", "", "", $this->getId());
                return $duplicate_id;
        }

        function insertQuestion($question_id) 
        {
                global $ilDB;

                $this->log->debug("insert question, id:".$question_id);
                
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                if (!SurveyQuestion::_isComplete($question_id))
                {
                        $this->log->debug("question is not complete");
                        return FALSE;
                }
                else
                {
                        // get maximum sequence index in test
                        // @todo: refactor this
                        $result = $ilDB->queryF("SELECT survey_question_id FROM svy_svy_qst WHERE survey_fi = %s",
                                array('integer'),
                                array($this->getSurveyId())
                        );
                        $sequence = $result->numRows();
                        $duplicate_id = $this->duplicateQuestionForSurvey($question_id);
                        $this->log->debug("duplicate, id: ".$question_id.", duplicate id: ".$duplicate_id);

                        // check if question is not already in the survey, see #22018
                        if ($this->isQuestionInSurvey($duplicate_id))
                        {
                                return false;
                        }

                        $next_id = $ilDB->nextId('svy_svy_qst');
                        $affectedRows = $ilDB->manipulateF("INSERT INTO svy_svy_qst (survey_question_id, survey_fi, question_fi, sequence, tstamp) VALUES (%s, %s, %s, %s, %s)",
                                array('integer', 'integer', 'integer', 'integer', 'integer'),
                                array($next_id, $this->getSurveyId(), $duplicate_id, $sequence, time())
                        );

                        $this->log->debug("added entry to svy_svy_qst, id: ".$next_id.", question id: ".$duplicate_id.", sequence: ".$sequence);

                        $this->loadQuestionsFromDb();
                        return TRUE;
                }
        }

        function isQuestionInSurvey($a_question_fi)
        {
                global $DIC;
//return false;
                $ilDB = $DIC->database();

                $set = $ilDB->query("SELECT * FROM svy_svy_qst ".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND question_fi = ".$ilDB->quote($a_question_fi, "integer"));
                if ($rec = $ilDB->fetchAssoc($set))
                {
                        return true;
                }
                return false;
        }



        function insertQuestionblock($questionblock_id) 
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT svy_qblk.title, svy_qblk.show_questiontext, svy_qblk.show_blocktitle,".
                        " svy_qblk_qst.question_fi FROM svy_qblk, svy_qblk_qst, svy_svy_qst".
                        " WHERE svy_qblk.questionblock_id = svy_qblk_qst.questionblock_fi".
                        " AND svy_svy_qst.question_fi = svy_qblk_qst.question_fi".
                        " AND svy_qblk.questionblock_id = %s".
                        " ORDER BY svy_svy_qst.sequence",
                        array('integer'),
                        array($questionblock_id)
                );
                $questions = array();
                $show_questiontext = 0;
                $show_blocktitle = 0;
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $duplicate_id = $this->duplicateQuestionForSurvey($row["question_fi"]);
                        array_push($questions, $duplicate_id);
                        $title = $row["title"];
                        $show_questiontext = $row["show_questiontext"];
                        $show_blocktitle = $row["show_blocktitle"];
                }
                $this->createQuestionblock($title, $show_questiontext, $show_blocktitle, $questions);
        }
        
        public function saveUserSettings($usr_id, $key, $title, $value)
        {
                global $ilDB;
                
                $next_id = $ilDB->nextId('svy_settings');
                $affectedRows = $ilDB->insert("svy_settings", array(
                        "settings_id" => array("integer", $next_id),
                        "usr_id" => array("integer", $usr_id),
                        "keyword" => array("text", $key),
                        "title" => array("text", $title),
                        "value" => array("clob", $value)
                ));
        }
        
        public function deleteUserSettings($id)
        {
                global $ilDB;
                
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_settings WHERE settings_id = %s",
                        array('integer'),
                        array($id)
                );
                return $affectedRows;
        }
        
        public function getUserSettings($usr_id, $key)
        {
                global $ilDB;

                $result = $ilDB->queryF("SELECT * FROM svy_settings WHERE usr_id = %s AND keyword = %s",
                        array('integer', 'text'),
                        array($usr_id, $key)
                );
                $found = array();
                if ($result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                $found[$row['settings_id']] = $row;
                        }
                }
                return $found;
        }

        function saveToDb()
        {
                global $ilDB;
                
                // date handling
                $rmd_start = $this->getReminderStart();
                if(is_object($rmd_start))
                {
                        $rmd_start = $rmd_start->get(IL_CAL_DATE);
                }
                $rmd_end = $this->getReminderEnd();
                if(is_object($rmd_end))
                {
                        $rmd_end = $rmd_end->get(IL_CAL_DATE);
                }
                
                include_once("./Services/RTE/classes/class.ilRTE.php");
                if ($this->getSurveyId() < 1)
                {
                        $next_id = $ilDB->nextId('svy_svy');
                        $affectedRows = $ilDB->insert("svy_svy", array(
                                "survey_id" => array("integer", $next_id),
                                "obj_fi" => array("integer", $this->getId()),
                                "author" => array("text", $this->getAuthor()),
                                "introduction" => array("clob", ilRTE::_replaceMediaObjectImageSrc($this->getIntroduction(), 0)),
                                "outro" => array("clob", ilRTE::_replaceMediaObjectImageSrc($this->getOutro(), 0)),
                                "status" => array("text", $this->getStatus()),
                                "startdate" => array("text", $this->getStartDate()),
                                "enddate" => array("text", $this->getEndDate()),
                                "evaluation_access" => array("text", $this->getEvaluationAccess()),
                                "invitation" => array("text", $this->getInvitation()),
                                "invitation_mode" => array("text", $this->getInvitationMode()),
                                "complete" => array("text", $this->isComplete()),
                                "created" => array("integer", time()),
                                "anonymize" => array("text", $this->getAnonymize()),
                                "show_question_titles" => array("text", $this->getShowQuestionTitles()),
                                "mailnotification" => array('integer', ($this->getMailNotification()) ? 1 : 0),
                                "mailaddresses" => array('text', strlen($this->getMailAddresses()) ? $this->getMailAddresses() : NULL),
                                "mailparticipantdata" => array('text', strlen($this->getMailParticipantData()) ? $this->getMailParticipantData() : NULL),
                                "tstamp" => array("integer", time()),
                                "template_id" => array("integer", $this->getTemplate()),
                                "pool_usage" => array("integer", $this->getPoolUsage()),
                                // 360°
                                "mode_360" => array("integer", $this->get360Mode()),
                                "mode_360_self_eval" => array("integer", $this->get360SelfEvaluation()),
                                "mode_360_self_rate" => array("integer", $this->get360SelfRaters()),
                                "mode_360_self_appr" => array("integer", $this->get360SelfAppraisee()),
                                "mode_360_results" => array("integer", $this->get360Results()),
                                "mode_360_skill_service" => array("integer", (int) $this->get360SkillService()),
                                // reminder/notification
                                "reminder_status" => array("integer", (int)$this->getReminderStatus()),
                                "reminder_start" => array("datetime", $rmd_start),
                                "reminder_end" => array("datetime", $rmd_end),
                                "reminder_frequency" => array("integer", (int)$this->getReminderFrequency()),                           
                                "reminder_target" => array("integer", (int)$this->getReminderTarget()),
                                "reminder_last_sent" => array("datetime", $this->getReminderLastSent()),
                                "reminder_tmpl" => array("text", $this->getReminderTemplate()),
                                "tutor_ntf_status" => array("integer", (int)$this->getTutorNotificationStatus()),
                                "tutor_ntf_reci" => array("text", implode(";", (array)$this->getTutorNotificationRecipients())),
                                "tutor_ntf_target" => array("integer", (int)$this->getTutorNotificationTarget()),
                                "own_results_view" => array("integer", $this->hasViewOwnResults()),
                                "own_results_mail" => array("integer", $this->hasMailOwnResults()),
                                "confirmation_mail" => array("integer", $this->hasMailConfirmation()),                          
                                "anon_user_list" => array("integer", $this->hasAnonymousUserList())
                        ));
                        $this->setSurveyId($next_id);
                }
                else
                {
                        $affectedRows = $ilDB->update("svy_svy", array(
                                "author" => array("text", $this->getAuthor()),
                                "introduction" => array("clob", ilRTE::_replaceMediaObjectImageSrc($this->getIntroduction(), 0)),
                                "outro" => array("clob", ilRTE::_replaceMediaObjectImageSrc($this->getOutro(), 0)),
                                "status" => array("text", $this->getStatus()),
                                "startdate" => array("text", $this->getStartDate()),
                                "enddate" => array("text", $this->getEndDate()),
                                "evaluation_access" => array("text", $this->getEvaluationAccess()),
                                "invitation" => array("text", $this->getInvitation()),
                                "invitation_mode" => array("text", $this->getInvitationMode()),
                                "complete" => array("text", $this->isComplete()),
                                "anonymize" => array("text", $this->getAnonymize()),
                                "show_question_titles" => array("text", $this->getShowQuestionTitles()),
                                "mailnotification" => array('integer', ($this->getMailNotification()) ? 1 : 0),
                                "mailaddresses" => array('text', strlen($this->getMailAddresses()) ? $this->getMailAddresses() : NULL),
                                "mailparticipantdata" => array('text', strlen($this->getMailParticipantData()) ? $this->getMailParticipantData() : NULL),
                                "tstamp" => array("integer", time()),
                                "template_id" => array("integer", $this->getTemplate()),
                                "pool_usage" => array("integer", $this->getPoolUsage()),
                                // 360°
                                "mode_360" => array("integer", $this->get360Mode()),
                                "mode_360_self_eval" => array("integer", $this->get360SelfEvaluation()),
                                "mode_360_self_rate" => array("integer", $this->get360SelfRaters()),
                                "mode_360_self_appr" => array("integer", $this->get360SelfAppraisee()),
                                "mode_360_results" => array("integer", $this->get360Results()),
                                "mode_360_skill_service" => array("integer", (int) $this->get360SkillService()),
                                // reminder/notification
                                "reminder_status" => array("integer", $this->getReminderStatus()),
                                "reminder_start" => array("datetime", $rmd_start),
                                "reminder_end" => array("datetime", $rmd_end),
                                "reminder_frequency" => array("integer", $this->getReminderFrequency()),
                                "reminder_target" => array("integer", $this->getReminderTarget()),
                                "reminder_last_sent" => array("datetime", $this->getReminderLastSent()),
                                "reminder_tmpl" => array("text", $this->getReminderTemplate()),
                                "tutor_ntf_status" => array("integer", $this->getTutorNotificationStatus()),
                                "tutor_ntf_reci" => array("text", implode(";", (array)$this->getTutorNotificationRecipients())),
                                "tutor_ntf_target" => array("integer", $this->getTutorNotificationTarget()),
                                "own_results_view" => array("integer", $this->hasViewOwnResults()),
                                "own_results_mail" => array("integer", $this->hasMailOwnResults()),
                                "confirmation_mail" => array("integer", $this->hasMailConfirmation()),                          
                                "anon_user_list" => array("integer", $this->hasAnonymousUserList())                             
                        ), array(
                        "survey_id" => array("integer", $this->getSurveyId())
                        ));
                }
                if ($affectedRows)
                {
                        // save questions to db
                        $this->saveQuestionsToDb();
                }
                
                // moved activation to ilObjectActivation
                if($this->ref_id)
                {
                        include_once "./Services/Object/classes/class.ilObjectActivation.php";          
                        ilObjectActivation::getItem($this->ref_id);
                        
                        $item = new ilObjectActivation;                 
                        if(!$this->isActivationLimited())
                        {
                                $item->setTimingType(ilObjectActivation::TIMINGS_DEACTIVATED);
                        }
                        else
                        {                               
                                $item->setTimingType(ilObjectActivation::TIMINGS_ACTIVATION);
                                $item->setTimingStart($this->getActivationStartDate());
                                $item->setTimingEnd($this->getActivationEndDate());
                                $item->toggleVisible($this->getActivationVisibility());
                        }                                               
                        
                        $item->update($this->ref_id);           
                }
        }

        function saveQuestionsToDb() 
        {
                global $ilDB;

                $this->log->debug("save questions");

                // gather old questions state
                $old_questions = array();
                $result = $ilDB->queryF("SELECT survey_question_id,question_fi,sequence".
                        " FROM svy_svy_qst WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );              
                while($row = $ilDB->fetchAssoc($result))
                {
                        $old_questions[$row["question_fi"]] = $row;             // problem, as soon as duplicates exist, they will be hidden here
                }               
                
                // #15231 - diff with current questions state
                $insert = $update = $delete = array();          
                foreach($this->questions as $seq => $fi)
                {
                        if(!array_key_exists($fi, $old_questions))              // really new fi IDs
                        {
                                $insert[] = $fi;                                                        // this should be ok, should not create duplicates here
                        }
                        else if($old_questions[$fi]["sequence"] != $seq)                                // we are updating one of the duplicates (if any)
                        {
                                $update[$fi] = $old_questions[$fi]["survey_question_id"];
                        }
                        // keep track of still relevant questions
                        unset($old_questions[$fi]);                                             // deleting old question, if they are not in current array
                }               
                
                // delete obsolete question relations
                if(sizeof($old_questions))
                {
                        $del_ids = array();
                        foreach($old_questions as $fi => $old)
                        {
                                $del_ids[] = $old["survey_question_id"];
                        }
                        $ilDB->manipulate($q = "DELETE FROM svy_svy_qst".
                                " WHERE ".$ilDB->in("survey_question_id", $del_ids, "", "integer"));
                        $this->log->debug("delete: ".$q);
                }
                unset($old_questions);
                
                // create/update question relations
                foreach($this->questions as $seq => $fi) 
                {
                        if(in_array($fi, $insert))
                        {
                                // check if question is not already in the survey, see #22018
                                if (!$this->isQuestionInSurvey($fi))
                                {
                                        $next_id = $ilDB->nextId('svy_svy_qst');
                                        $ilDB->manipulateF("INSERT INTO svy_svy_qst" .
                                                " (survey_question_id, survey_fi, question_fi, heading, sequence, tstamp)" .
                                                " VALUES (%s, %s, %s, %s, %s, %s)",
                                                array('integer', 'integer', 'integer', 'text', 'integer', 'integer'),
                                                array($next_id, $this->getSurveyId(), $fi, null, $seq, time())
                                        );
                                        $this->log->debug("insert svy_svy_qst, id:" . $next_id . ", fi: " . $fi . ", seq:" . $seq);
                                }
                        }
                        else if(array_key_exists($fi, $update))
                        {
                                $ilDB->manipulate("UPDATE svy_svy_qst".
                                        " SET sequence = ".$ilDB->quote($seq, "integer").
                                        ", tstamp = ".$ilDB->quote(time(), "integer").
                                        " WHERE survey_question_id = ".$ilDB->quote($update[$fi], "integer"));
                                $this->log->debug("update svy_svy_qst, id:".$update[$fi].", fi: ".$fi.", seq:".$seq);
                        }
                }
        }

        function getAnonymousId($id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT anonymous_id FROM svy_finished WHERE anonymous_id = %s",
                        array('text'),
                        array($id)
                );
                if ($result->numRows())
                {
                        $row = $ilDB->fetchAssoc($result);
                        return $row["anonymous_id"];
                }
                else
                {
                        return "";
                }
        }

        function getQuestionGUI($questiontype, $question_id)
        {
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestionGUI.php";
                return SurveyQuestionGUI::_getQuestionGUI($questiontype, $question_id);
        }
        
        function getQuestionType($question_id) 
        {
                global $ilDB;
                if ($question_id < 1) return -1;
                $result = $ilDB->queryF("SELECT type_tag FROM svy_question, svy_qtype WHERE svy_question.question_id = %s AND " .
                        "svy_question.questiontype_fi = svy_qtype.questiontype_id",
                        array('integer'),
                        array($question_id)
                );
                if ($result->numRows() == 1) 
                {
                        $data = $ilDB->fetchAssoc($result);
                        return $data["type_tag"];
                } 
                else 
                {
                        return "";
                }
        }

        function getSurveyId()
        {
                return $this->survey_id;
        }
        
        function setAnonymize($a_anonymize)
        {
                switch ($a_anonymize)
                {
                        case self::ANONYMIZE_OFF:
                        case self::ANONYMIZE_ON:
                        case self::ANONYMIZE_FREEACCESS:
                        case self::ANONYMIZE_CODE_ALL:
                                $this->anonymize = $a_anonymize;
                                break;
                        default:
                                $this->anonymize = self::ANONYMIZE_OFF;
                                break;
                }
        }

        function getAnonymize()
        {
                return ($this->anonymize) ? $this->anonymize : 0;
        }
        
        function isAccessibleWithoutCode()
        {
                return ($this->getAnonymize() == self::ANONYMIZE_OFF || 
                        $this->getAnonymize() == self::ANONYMIZE_FREEACCESS);           
        }
        
        function hasAnonymizedResults()
        {
                return ($this->getAnonymize() == self::ANONYMIZE_ON || 
                        $this->getAnonymize() == self::ANONYMIZE_FREEACCESS);
        }

        function loadFromDb()
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT * FROM svy_svy WHERE obj_fi = %s",
                        array('integer'),
                        array($this->getId())
                );
                if ($result->numRows() == 1) 
                {
                        $data = $ilDB->fetchAssoc($result);
                        $this->setSurveyId($data["survey_id"]);
                        $this->setAuthor($data["author"]);
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->setIntroduction(ilRTE::_replaceMediaObjectImageSrc($data["introduction"], 1));
                        if (strcmp($data["outro"], "survey_finished") == 0)
                        {
                                $this->setOutro($this->lng->txt("survey_finished"));
                        }
                        else
                        {
                                $this->setOutro(ilRTE::_replaceMediaObjectImageSrc($data["outro"], 1));
                        }
                        $this->setInvitation($data["invitation"]);
                        $this->setInvitationMode($data["invitation_mode"]);
                        $this->setShowQuestionTitles($data["show_question_titles"]);
                        $this->setStartDate($data["startdate"]);
                        $this->setEndDate($data["enddate"]);
                        $this->setAnonymize($data["anonymize"]);
                        $this->setEvaluationAccess($data["evaluation_access"]);
                        $this->loadQuestionsFromDb();
                        $this->setStatus($data["status"]);
                        $this->setMailNotification($data['mailnotification']);
                        $this->setMailAddresses($data['mailaddresses']);
                        $this->setMailParticipantData($data['mailparticipantdata']);
                        $this->setTemplate($data['template_id']);
                        $this->setPoolUsage($data['pool_usage']);
                        // 360°
                        $this->set360Mode($data['mode_360']);
                        $this->set360SelfEvaluation($data['mode_360_self_eval']);
                        $this->set360SelfRaters($data['mode_360_self_rate']);
                        $this->set360SelfAppraisee($data['mode_360_self_appr']);
                        $this->set360Results($data['mode_360_results']);
                        $this->set360SkillService($data['mode_360_skill_service']);
                        // reminder/notification
                        $this->setReminderStatus($data["reminder_status"]);
                        $this->setReminderStart($data["reminder_start"] ? new ilDate($data["reminder_start"], IL_CAL_DATE) : null);
                        $this->setReminderEnd($data["reminder_end"] ? new ilDate($data["reminder_end"], IL_CAL_DATE) : null);
                        $this->setReminderFrequency($data["reminder_frequency"]);
                        $this->setReminderTarget($data["reminder_target"]);
                        $this->setReminderLastSent($data["reminder_last_sent"]);
                        $this->setReminderTemplate($data["reminder_tmpl"]);
                        $this->setTutorNotificationStatus($data["tutor_ntf_status"]);
                        $this->setTutorNotificationRecipients(explode(";", $data["tutor_ntf_reci"]));
                        $this->setTutorNotificationTarget($data["tutor_ntf_target"]);
                        
                        $this->setViewOwnResults($data["own_results_view"]);
                        $this->setMailOwnResults($data["own_results_mail"]);
                        $this->setMailConfirmation($data["confirmation_mail"]);
                        
                        $this->setAnonymousUserList($data["anon_user_list"]);                   
                }
                
                // moved activation to ilObjectActivation
                if($this->ref_id)
                {
                        include_once "./Services/Object/classes/class.ilObjectActivation.php";
                        $activation = ilObjectActivation::getItem($this->ref_id);                       
                        switch($activation["timing_type"])
                        {                               
                                case ilObjectActivation::TIMINGS_ACTIVATION:    
                                        $this->setActivationLimited(true);
                                        $this->setActivationStartDate($activation["timing_start"]);
                                        $this->setActivationEndDate($activation["timing_end"]);
                                        $this->setActivationVisibility($activation["visible"]);
                                        break;
                                
                                default:                        
                                        $this->setActivationLimited(false);
                                        break;                                                  
                        }
                }
        }

        function loadQuestionsFromDb() 
        {
                global $ilDB;
                $this->questions = array();
                $result = $ilDB->queryF("SELECT * FROM svy_svy_qst WHERE survey_fi = %s ORDER BY sequence",
                        array('integer'),
                        array($this->getSurveyId())
                );
                while ($data = $ilDB->fetchAssoc($result)) 
                {
                        $this->questions[$data["sequence"]] = $data["question_fi"];
                }
        }

        function fixSequenceStructure()
        {
                global $DIC;

                $ilDB = $DIC->database();
//return;
                // we keep all survey question ids with their lowest sequence
                $result = $ilDB->queryF("SELECT * FROM svy_svy_qst WHERE survey_fi = %s ORDER BY sequence",
                        array('integer'),
                        array($this->getSurveyId())
                );

                // step 1: find duplicates -> $to_delete_ids
                $fis = array();
                $to_delete_ids = array();
                while ($data = $ilDB->fetchAssoc($result))
                {
                        if (in_array($data["question_fi"], $fis))               // found a duplicate
                        {
                                $to_delete_ids[] = $data["survey_question_id"];
                        }
                        else
                        {
                                $fis[] = $data["question_fi"];
                        }
                }

                // step 2: we delete the duplicates
                if (count($to_delete_ids) > 0)
                {
                        $ilDB->manipulate($q = "DELETE FROM svy_svy_qst" .
                                " WHERE " . $ilDB->in("survey_question_id", $to_delete_ids, false, "integer") .
                                " AND survey_fi = " . $ilDB->quote($this->getSurveyId(), "integer"));
                        $this->log->debug("delete: " . $q);

                        $ilDB->manipulate($q = "DELETE FROM svy_qblk_qst " .
                                " WHERE " . $ilDB->in("question_fi", $fis, true, "integer") .
                                " AND survey_fi = " . $ilDB->quote($this->getSurveyId(), "integer"));
                        $this->log->debug("delete: " . $q);
                }

                // step 3: we fix the sequence
                $set = $ilDB->query("SELECT * FROM svy_svy_qst ".
                        " WHERE survey_fi = " . $ilDB->quote($this->getSurveyId(), "integer")." ORDER BY sequence");
                $seq = 0;
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        $ilDB->manipulate($q = "UPDATE svy_svy_qst SET ".
                                " sequence = ".$ilDB->quote($seq++ , "integer").
                                " WHERE survey_question_id = ".$ilDB->quote($rec["survey_question_id"], "integer")
                        );
                        $this->log->debug("update: " . $q);
                }
        }


        function setAuthor($author = "") 
        {
                $this->author = $author;
        }

        function saveAuthorToMetadata($a_author = "")
        {
                $md = new ilMD($this->getId(), 0, $this->getType());
                $md_life =& $md->getLifecycle();
                if (!$md_life)
                {
                        if (strlen($a_author) == 0)
                        {
                                global $ilUser;
                                $a_author = $ilUser->getFullname();
                        }
                        
                        $md_life =& $md->addLifecycle();
                        $md_life->save();
                        $con =& $md_life->addContribute();
                        $con->setRole("Author");
                        $con->save();
                        $ent =& $con->addEntity();
                        $ent->setEntity($a_author);
                        $ent->save();
                }
        }
        
  function getAuthor() 
        {
                $author = array();
                include_once "./Services/MetaData/classes/class.ilMD.php";
                $md = new ilMD($this->getId(), 0, $this->getType());
                $md_life =& $md->getLifecycle();
                if ($md_life)
                {
                        $ids =& $md_life->getContributeIds();
                        foreach ($ids as $id)
                        {
                                $md_cont =& $md_life->getContribute($id);
                                if (strcmp($md_cont->getRole(), "Author") == 0)
                                {
                                        $entids =& $md_cont->getEntityIds();
                                        foreach ($entids as $entid)
                                        {
                                                $md_ent =& $md_cont->getEntity($entid);
                                                array_push($author, $md_ent->getEntity());
                                        }
                                }
                        }
                }
                return join($author, ",");
  }

        public function getShowQuestionTitles() 
        {
                return ($this->display_question_titles) ? 1 : 0;
        }

        public function setShowQuestionTitles($a_show) 
        {
                $this->display_question_titles = ($a_show) ? 1 : 0;
        }

        function showQuestionTitles() 
        {
                $this->display_question_titles = 1;
        }

        function hideQuestionTitles() 
        {
                $this->display_question_titles = 0;
        }
        
        function setInvitation($invitation = 0) 
        {
                global $ilDB, $ilAccess;
                
                $this->invitation = $invitation;
                if ($invitation == self::INVITATION_OFF)
                {
                        $this->disinviteAllUsers();
                }
                else if ($invitation == self::INVITATION_ON)
                {
                        if ($this->getInvitationMode() == self::MODE_UNLIMITED)
                        {
                                $result = $ilDB->query("SELECT usr_id FROM usr_data");
                                while ($row = $ilDB->fetchAssoc($result))
                                {                                       
                                        if ($ilAccess->checkAccessOfUser($row["usr_id"], "read", "", $this->getRefId(), "svy", $this->getId()))
                                        {
                                                $this->inviteUser($row['usr_id']);
                                        }
                                }
                        }
                }
  }

  function setInvitationMode($invitation_mode = 0) 
        {
                $this->invitation_mode = $invitation_mode;
  }
        
        function setInvitationAndMode($invitation = 0, $invitation_mode = 0)
        {
                $this->invitation_mode = $invitation_mode;
                $this->setInvitation($invitation);
        }

        public function setIntroduction($introduction = "") 
        {
                $this->introduction = $introduction;
        }

        public function setOutro($outro = "") 
        {
                $this->outro = $outro;
        }

        function getInvitation() 
        {
                return ($this->invitation) ? $this->invitation : self::INVITATION_OFF;
        }

        function getInvitationMode() 
        {
                include_once "./Services/Administration/classes/class.ilSetting.php";
                $surveySetting = new ilSetting("survey");
                $unlimited_invitation = $surveySetting->get("unlimited_invitation");
                if (!$unlimited_invitation && $this->invitation_mode == self::MODE_UNLIMITED)
                {
                        return self::MODE_PREDEFINED_USERS;
                }
                else
                {
                        return ($this->invitation_mode) ? $this->invitation_mode : self::MODE_UNLIMITED;
                }
        }

        function getStatus() 
        {
                return ($this->status) ? $this->status : self::STATUS_OFFLINE;
        }

        function isOnline() 
        {
                return ($this->status == self::STATUS_ONLINE) ? true : false;
        }

        function isOffline() 
        {
                return ($this->status == self::STATUS_OFFLINE) ? true : false;
        }

        function setStatus($status = self::STATUS_OFFLINE) 
        {
                $result = "";
                if (($status == self::STATUS_ONLINE) && (count($this->questions) == 0))
                {
                        $this->status = self::STATUS_OFFLINE;
                        $result = $this->lng->txt("cannot_switch_to_online_no_questions");
                }
                else
                {
                        $this->status = $status;
                }
                return $result;
        }

        function getStartDate() 
        {
                return (strlen($this->start_date)) ? $this->start_date : NULL;
        }

        function canStartSurvey($anonymous_id = NULL, $a_no_rbac = false)
        {
                global $ilAccess;
                
                $result = TRUE;
                $messages = array();
                $edit_settings = false;
                // check start date             
                if (preg_match("/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/", $this->getStartDate(), $matches))
                {                       
                        $epoch_time = mktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);             
                        $now = time();
                        if ($now < $epoch_time) 
                        {               
                                array_push($messages,$this->lng->txt('start_date_not_reached').' ('.
                                        ilDatePresentation::formatDate(new ilDateTime($this->getStartDate(), IL_CAL_TIMESTAMP)). ")");
                                $result = FALSE;
                                $edit_settings = true;
                        }
                }                               
                // check end date               
                if (preg_match("/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/", $this->getEndDate(), $matches))
                {
                        $epoch_time = mktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);
                        $now = time();
                        if ($now > $epoch_time) 
                        {
                                array_push($messages,$this->lng->txt('end_date_reached').' ('.
                                        ilDatePresentation::formatDate(new ilDateTime($this->getEndDate(), IL_CAL_TIMESTAMP)). ")");
                                $result = FALSE;
                                $edit_settings = true;
                        }
                }
                
                // check online status
                if ($this->getStatus() == self::STATUS_OFFLINE)
                {
                        array_push($messages, $this->lng->txt("survey_is_offline"));
                        $result = FALSE;
                        $edit_settings = true;
                }
                // check rbac permissions
                if (!$a_no_rbac && !$ilAccess->checkAccess("read", "", $this->ref_id))
                {
                        array_push($messages, $this->lng->txt("cannot_participate_survey"));
                        $result = FALSE;
                }
                /*
                // 2. check previous access
                if (!$result["error"])
                {
                        global $ilUser;
                        $survey_started = $this->isSurveyStarted($ilUser->getId(), $anonymous_id);
                        if ($survey_started === 1)
                        {
                                array_push($messages, $this->lng->txt("already_completed_survey"));
                                $result = FALSE;
                        }
                }                
                */
                return array(
                        "result" => $result,
                        "messages" => $messages,
                        "edit_settings" => $edit_settings
                );
        }

        function setStartDate($start_date = "") 
        {
                $this->start_date = $start_date;
        }

        function setStartDateAndTime($start_date = "", $start_time) 
        {
                $y = ''; $m = ''; $d = ''; $h = ''; $i = ''; $s = '';
                if (preg_match("/(\d{4})-(\d{2})-(\d{2})/", $start_date, $matches))
                {
                        $y = $matches[1];
                        $m = $matches[2];
                        $d = $matches[3];
                }
                if (preg_match("/(\d{2}):(\d{2}):(\d{2})/", $start_time, $matches))
                {
                        $h = $matches[1];
                        $i = $matches[2];
                        $s = $matches[3];
                }
                $this->start_date = sprintf('%04d%02d%02d%02d%02d%02d', $y, $m, $d, $h, $i, $s);
        }

        function getEndDate() 
        {
                return (strlen($this->end_date)) ? $this->end_date : NULL;
        }

        function setEndDate($end_date = "") 
        {
                $this->end_date = $end_date;
        }

        function setEndDateAndTime($end_date = "", $end_time) 
        {
                $y = ''; $m = ''; $d = ''; $h = ''; $i = ''; $s = '';
                if (preg_match("/(\d{4})-(\d{2})-(\d{2})/", $end_date, $matches))
                {
                        $y = $matches[1];
                        $m = $matches[2];
                        $d = $matches[3];
                }
                if (preg_match("/(\d{2}):(\d{2}):(\d{2})/", $end_time, $matches))
                {
                        $h = $matches[1];
                        $i = $matches[2];
                        $s = $matches[3];
                }
                $this->end_date = sprintf('%04d%02d%02d%02d%02d%02d', $y, $m, $d, $h, $i, $s);
        }

        function getEvaluationAccess() 
        {
                return ($this->evaluation_access) ? $this->evaluation_access : self::EVALUATION_ACCESS_OFF;
        }

        function setEvaluationAccess($evaluation_access = self::EVALUATION_ACCESS_OFF) 
        {
                $this->evaluation_access = ($evaluation_access) ? $evaluation_access : self::EVALUATION_ACCESS_OFF;
        }
        
        function setActivationVisibility($a_value)
        {
                $this->activation_visibility = (bool) $a_value;
        }
        
        function getActivationVisibility()
        {
                return $this->activation_visibility;
        }
        
        function isActivationLimited()
        {
           return (bool)$this->activation_limited;
        }
        
        function setActivationLimited($a_value)
        {
           $this->activation_limited = (bool)$a_value;
        }

        function getIntroduction() 
        {
                return (strlen($this->introduction)) ? $this->introduction : NULL;
        }

        function getOutro() 
        {
                return (strlen($this->outro)) ? $this->outro : NULL;
        }

        function &getExistingQuestions() 
        {
                global $ilDB;
                $existing_questions = array();
                $result = $ilDB->queryF("SELECT svy_question.original_id FROM svy_question, svy_svy_qst WHERE " .
                        "svy_svy_qst.survey_fi = %s AND svy_svy_qst.question_fi = svy_question.question_id",
                        array('integer'),
                        array($this->getSurveyId())
                );
                while ($data = $ilDB->fetchAssoc($result)) 
                {
                        if($data["original_id"])
                        {
                                array_push($existing_questions, $data["original_id"]);
                        }
                }
                return $existing_questions;
        }

        function &getQuestionpoolTitles($could_be_offline = FALSE, $showPath = FALSE) 
        {
                include_once "./Modules/SurveyQuestionPool/classes/class.ilObjSurveyQuestionPool.php";
                return ilObjSurveyQuestionPool::_getAvailableQuestionpools($use_object_id = TRUE, $could_be_offline, $showPath);
        }
        
        function moveQuestions($move_questions, $target_index, $insert_mode)
        {
                $array_pos = array_search($target_index, $this->questions);
                if ($insert_mode == 0)
                {
                        $part1 = array_slice($this->questions, 0, $array_pos);
                        $part2 = array_slice($this->questions, $array_pos);
                }
                else if ($insert_mode == 1)
                {
                        $part1 = array_slice($this->questions, 0, $array_pos + 1);
                        $part2 = array_slice($this->questions, $array_pos + 1);
                }
                foreach ($move_questions as $question_id)
                {
                        if (!(array_search($question_id, $part1) === FALSE))
                        {
                                unset($part1[array_search($question_id, $part1)]);
                        }
                        if (!(array_search($question_id, $part2) === FALSE))
                        {
                                unset($part2[array_search($question_id, $part2)]);
                        }
                }
                $part1 = array_values($part1);
                $part2 = array_values($part2);
                $this->questions = array_values(array_merge($part1, $move_questions, $part2));
                foreach ($move_questions as $question_id)
                {
                        $constraints = $this->getConstraints($question_id);
                        foreach ($constraints as $idx => $constraint)
                        {
                                foreach ($part2 as $next_question_id)
                                {
                                        if ($constraint["question"] == $next_question_id)
                                        {
                                                // constraint concerning a question that follows -> delete constraint
                                                $this->deleteConstraint($constraint["id"]);
                                        }
                                }
                        }
                }
                $this->saveQuestionsToDb();
        }
        
        function removeQuestion($question_id)
        {
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                $question = self::_instanciateQuestion($question_id);
                #20610 if no question found, do nothing.
                if($question)
                {
                        $question->delete($question_id);
                        $this->removeConstraintsConcerningQuestion($question_id);
                }
        }
        
        function removeConstraintsConcerningQuestion($question_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT constraint_fi FROM svy_qst_constraint WHERE question_fi = %s AND survey_fi = %s",
                        array('integer','integer'),
                        array($question_id, $this->getSurveyId())
                );
                if ($result->numRows() > 0)
                {
                        $remove_constraints = array();
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                array_push($remove_constraints, $row["constraint_fi"]);
                        }
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qst_constraint WHERE question_fi = %s AND survey_fi = %s",
                                array('integer','integer'),
                                array($question_id, $this->getSurveyId())
                        );
                        foreach ($remove_constraints as $key => $constraint_id)
                        {
                                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_constraint WHERE constraint_id = %s",
                                        array('integer'),
                                        array($constraint_id)
                                );
                        }
                }
        }
                
        function removeQuestions($remove_questions, $remove_questionblocks)
        {
                global $ilDB;

                $block_sizes = array();
                foreach ($this->getSurveyQuestions() as $question_id => $data)
                {
                        if (in_array($question_id, $remove_questions) or in_array($data["questionblock_id"], $remove_questionblocks))
                        {
                                unset($this->questions[array_search($question_id, $this->questions)]);
                            $this->removeQuestion($question_id);
                        }
                        else if($data["questionblock_id"])
                        {
                                $block_sizes[$data["questionblock_id"]]++;
                        }
                }
                
                // blocks with just 1 question need to be deleted
                foreach($block_sizes as $block_id => $size)
                {
                        if($size < 2)
                        {
                                $remove_questionblocks[] = $block_id;
                        }
                }

                foreach (array_unique($remove_questionblocks) as $questionblock_id)
                {
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk WHERE questionblock_id = %s",
                                array('integer'),
                                array($questionblock_id)
                        );
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk_qst WHERE questionblock_fi = %s AND survey_fi = %s",
                                array('integer','integer'),
                                array($questionblock_id, $this->getSurveyId())
                        );
                }
                
                $this->questions = array_values($this->questions);
                $this->saveQuestionsToDb();
        }
                
        function unfoldQuestionblocks($questionblocks)
        {
                global $ilDB;
                foreach ($questionblocks as $index)
                {
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk WHERE questionblock_id = %s",
                                array('integer'),
                                array($index)
                        );
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk_qst WHERE questionblock_fi = %s AND survey_fi = %s",
                                array('integer','integer'),
                                array($index, $this->getSurveyId())
                        );
                }
        }

        function removeQuestionFromBlock($question_id, $questionblock_id)
        {
                global $ilDB;
                
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qblk_qst WHERE questionblock_fi = %s AND survey_fi = %s AND question_fi = %s",
                        array('integer','integer','integer'),
                        array($questionblock_id, $this->getSurveyId(), $question_id)
                );
        }

        function addQuestionToBlock($question_id, $questionblock_id)
        {
                global $ilDB;

                // see #22018
                if (!$this->isQuestionInAnyBlock($question_id))
                {
                        $next_id = $ilDB->nextId('svy_qblk_qst');
                        $affectedRows = $ilDB->manipulateF("INSERT INTO svy_qblk_qst (qblk_qst_id, survey_fi, questionblock_fi, " .
                                "question_fi) VALUES (%s, %s, %s, %s)",
                                array('integer', 'integer', 'integer', 'integer'),
                                array($next_id, $this->getSurveyId(), $questionblock_id, $question_id)
                        );

                        $this->deleteConstraints($question_id); // #13713
                }
        }

        function isQuestionInAnyBlock($a_question_fi)
        {
                global $DIC;

                $ilDB = $DIC->database();

                $set = $ilDB->query("SELECT * FROM svy_qblk_qst ".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND question_fi = ".$ilDB->quote($a_question_fi, "integer"));
                if ($rec = $ilDB->fetchAssoc($set))
                {
                        return true;
                }
                return false;
        }


        function &getQuestionblockQuestions($questionblock_id)
        {
                global $ilDB;
                $titles = array();
                $result = $ilDB->queryF("SELECT svy_question.title, svy_qblk_qst.question_fi, svy_qblk_qst.survey_fi FROM ".
                        "svy_qblk, svy_qblk_qst, svy_question WHERE svy_qblk.questionblock_id = svy_qblk_qst.questionblock_fi AND " .
                        "svy_question.question_id = svy_qblk_qst.question_fi AND svy_qblk.questionblock_id = %s",
                        array('integer'),
                        array($questionblock_id)
                );
                $survey_id = "";
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $titles[$row["question_fi"]] = $row["title"];
                        $survey_id = $row["survey_fi"];
                }
                $result = $ilDB->queryF("SELECT question_fi, sequence FROM svy_svy_qst WHERE survey_fi = %s ORDER BY sequence",
                        array('integer'),
                        array($survey_id)
                );
                $resultarray = array();
                $counter = 1;
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if (array_key_exists($row["question_fi"], $titles))
                        {
                                $resultarray[$counter++] = $titles[$row["question_fi"]];
                        }
                }
                return $resultarray;
        }
        
        function &getQuestionblockQuestionIds($questionblock_id)
        {
                global $ilDB;

                // we need a correct order here, see #22011
                $result = $ilDB->queryF("SELECT a.question_fi FROM svy_qblk_qst a JOIN svy_svy_qst b ON (a.question_fi = b.question_fi) ".
                        " WHERE a.questionblock_fi = %s ORDER BY b.sequence",
                        array("integer"),
                        array($questionblock_id)
                );
                $ids = array();
                if ($result->numRows())
                {
                        while ($data = $ilDB->fetchAssoc($result))
                        {
                                if (!in_array($data['question_fi'], $ids))              // no duplicates, see #22018
                                {
                                        array_push($ids, $data['question_fi']);
                                }
                        }
                }

                return $ids;
        }
        
        static function _getQuestionblock($questionblock_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT * FROM svy_qblk WHERE questionblock_id = %s",
                        array('integer'),
                        array($questionblock_id)
                );
                $row = $ilDB->fetchAssoc($result);
                return $row;
        }

        static function _addQuestionblock($title = "", $owner = 0,  $show_questiontext = true, $show_blocktitle = false)
        {               
                global $ilDB;
                $next_id = $ilDB->nextId('svy_qblk');
                $ilDB->manipulateF("INSERT INTO svy_qblk (questionblock_id, title, show_questiontext,".
                        " show_blocktitle, owner_fi, tstamp) " .
                        "VALUES (%s, %s, %s, %s, %s, %s)",
                        array('integer','text','integer','integer','integer','integer'),
                        array($next_id, $title, $show_questiontext, $show_blocktitle, $owner, time())
                );
                return $next_id;
        }
        
        function createQuestionblock($title, $show_questiontext, $show_blocktitle, $questions)
        {
                global $ilDB;
                
                // if the selected questions are not in a continous selection, move all questions of the
                // questionblock at the position of the first selected question
                $this->moveQuestions($questions, $questions[0], 0);
                
                // now save the question block
                global $ilUser;
                $next_id = $ilDB->nextId('svy_qblk');
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_qblk (questionblock_id, title, show_questiontext,".
                        " show_blocktitle, owner_fi, tstamp) VALUES (%s, %s, %s, %s, %s, %s)",
                        array('integer','text','text','text','integer','integer'),
                        array($next_id, $title, $show_questiontext, $show_blocktitle, $ilUser->getId(), time())
                );
                if ($affectedRows)
                {
                        $questionblock_id = $next_id;
                        foreach ($questions as $index)
                        {
                                if (!$this->isQuestionInAnyBlock($index))
                                {
                                        $next_id = $ilDB->nextId('svy_qblk_qst');       // #22018
                                        $affectedRows = $ilDB->manipulateF("INSERT INTO svy_qblk_qst (qblk_qst_id, survey_fi, questionblock_fi, " .
                                                "question_fi) VALUES (%s, %s, %s, %s)",
                                                array('integer', 'integer', 'integer', 'integer'),
                                                array($next_id, $this->getSurveyId(), $questionblock_id, $index)
                                        );
                                        $this->deleteConstraints($index);
                                }
                        }
                }
        }
        
        function modifyQuestionblock($questionblock_id, $title, $show_questiontext, $show_blocktitle)
        {
                global $ilDB;
                $affectedRows = $ilDB->manipulateF("UPDATE svy_qblk SET title = %s, show_questiontext = %s,".
                        " show_blocktitle = %s WHERE questionblock_id = %s",
                        array('text','text','text','integer'),
                        array($title, $show_questiontext, $show_blocktitle, $questionblock_id)
                );
        }
        
        function deleteConstraints($question_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT constraint_fi FROM svy_qst_constraint WHERE question_fi = %s AND survey_fi = %s",
                        array('integer','integer'),
                        array($question_id, $this->getSurveyId())
                );
                $constraints = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        array_push($constraints, $row["constraint_fi"]);
                }
                foreach ($constraints as $constraint_id)
                {
                        $this->deleteConstraint($constraint_id);
                }
        }

        function deleteConstraint($constraint_id)
        {
                global $ilDB;
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_constraint WHERE constraint_id = %s",
                        array('integer'),
                        array($constraint_id)
                );
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_qst_constraint WHERE constraint_fi = %s",
                        array('integer'),
                        array($constraint_id)
                );
        }

        public function &getSurveyQuestions($with_answers = false)
        {
                global $ilDB;
                // get questionblocks
                $all_questions = array();
                $result = $ilDB->queryF("SELECT svy_qtype.type_tag, svy_qtype.plugin, svy_question.question_id, ".
                        "svy_svy_qst.heading FROM svy_qtype, svy_question, svy_svy_qst WHERE svy_svy_qst.survey_fi = %s AND " .
                        "svy_svy_qst.question_fi = svy_question.question_id AND svy_question.questiontype_fi = svy_qtype.questiontype_id " .
                        "ORDER BY svy_svy_qst.sequence",
                        array('integer'),
                        array($this->getSurveyId())
                );
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $add = true;
                        if ($row["plugin"])
                        {
                                if (!$this->isPluginActive($row["type_tag"]))
                                {
                                        $add = false;
                                }
                        }
                        if ($add)
                        {
                                $question = self::_instanciateQuestion($row["question_id"]);
                                $questionrow = $question->getQuestionDataArray($row["question_id"]);
                                foreach ($row as $key => $value)
                                {
                                        $questionrow[$key] = $value;
                                }
                                $all_questions[$row["question_id"]] = $questionrow;
                                $all_questions[$row["question_id"]]["usableForPrecondition"] = $question->usableForPrecondition();
                                $all_questions[$row["question_id"]]["availableRelations"] = $question->getAvailableRelations();
                        }
                }
                // get all questionblocks
                $questionblocks = array();
                if (count($all_questions))
                {
                        $result = $ilDB->queryF("SELECT svy_qblk.*, svy_qblk_qst.question_fi FROM svy_qblk, svy_qblk_qst WHERE " .
                                "svy_qblk.questionblock_id = svy_qblk_qst.questionblock_fi AND svy_qblk_qst.survey_fi = %s " .
                                "AND " . $ilDB->in('svy_qblk_qst.question_fi', array_keys($all_questions), false, 'integer'),
                                array('integer'),
                                array($this->getSurveyId())
                        );
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                $questionblocks[$row['question_fi']] = $row;
                        }
                }
                
                foreach ($all_questions as $question_id => $row)
                {
                        $constraints = $this->getConstraints($question_id);
                        if (isset($questionblocks[$question_id]))
                        {
                                $all_questions[$question_id]["questionblock_title"] = $questionblocks[$question_id]['title'];
                                $all_questions[$question_id]["questionblock_id"] = $questionblocks[$question_id]['questionblock_id'];
                                $all_questions[$question_id]["constraints"] = $constraints;
                        }
                        else
                        {
                                $all_questions[$question_id]["questionblock_title"] = "";
                                $all_questions[$question_id]["questionblock_id"] = "";
                                $all_questions[$question_id]["constraints"] = $constraints;
                        }
                        if ($with_answers)
                        {
                                $answers = array();
                                $result = $ilDB->queryF("SELECT svy_variable.*, svy_category.title FROM svy_variable, svy_category " .
                                        "WHERE svy_variable.question_fi = %s AND svy_variable.category_fi = svy_category.category_id ".
                                        "ORDER BY sequence ASC",
                                        array('integer'),
                                        array($question_id)
                                );
                                if ($result->numRows() > 0) 
                                {
                                        while ($data = $ilDB->fetchAssoc($result)) 
                                        {
                                                array_push($answers, $data["title"]);
                                        }
                                }
                                $all_questions[$question_id]["answers"] = $answers;
                        }
                }
                return $all_questions;
        }
        
        function setObligatoryStates($obligatory_questions)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT * FROM svy_svy_qst WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                if ($result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                if (!array_key_exists($row["question_fi"], $obligatory_questions))
                                {
                                        $obligatory_questions[$row["question_fi"]] = 0;
                                }
                        }
                }

                // set the obligatory states in the database
                foreach ($obligatory_questions as $question_fi => $obligatory)
                {
                        // #12420
                        $ilDB->manipulate("UPDATE svy_question".
                                " SET obligatory = ".$ilDB->quote($obligatory, "integer").
                                " WHERE question_id = ".$ilDB->quote($question_fi, "integer"));
                }
        }

        function &getSurveyPages()
        {
                global $ilDB;
                // get questionblocks
                $all_questions = array();
                $result = $ilDB->queryF("SELECT svy_question.*, svy_qtype.type_tag, svy_svy_qst.heading FROM " . 
                        "svy_question, svy_qtype, svy_svy_qst WHERE svy_svy_qst.survey_fi = %s AND " .
                        "svy_svy_qst.question_fi = svy_question.question_id AND svy_question.questiontype_fi = svy_qtype.questiontype_id ".
                        "ORDER BY svy_svy_qst.sequence",
                        array('integer'),
                        array($this->getSurveyId())
                );
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $all_questions[$row["question_id"]] = $row;
                }
                // get all questionblocks
                $questionblocks = array();
                if (count($all_questions))
                {
                        $result = $ilDB->queryF("SELECT svy_qblk.*, svy_qblk_qst.question_fi FROM svy_qblk, svy_qblk_qst ".
                                "WHERE svy_qblk.questionblock_id = svy_qblk_qst.questionblock_fi AND svy_qblk_qst.survey_fi = %s ".
                                "AND " . $ilDB->in('svy_qblk_qst.question_fi', array_keys($all_questions), false, 'integer'),
                                array('integer'),
                                array($this->getSurveyId())
                        );
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                $questionblocks[$row['question_fi']] = $row;
                        }
                }
                
                $all_pages = array();
                $pageindex = -1;
                $currentblock = "";
                foreach ($all_questions as $question_id => $row)
                {
                        $constraints = array();
                        if (isset($questionblocks[$question_id]))
                        {
                                if (!$currentblock or ($currentblock != $questionblocks[$question_id]['questionblock_id']))
                                {
                                        $pageindex++;
                                }
                                $all_questions[$question_id]['page'] = $pageindex;
                                $all_questions[$question_id]["questionblock_title"] = $questionblocks[$question_id]['title'];
                                $all_questions[$question_id]["questionblock_id"] = $questionblocks[$question_id]['questionblock_id'];
                                $all_questions[$question_id]["questionblock_show_questiontext"] = $questionblocks[$question_id]['show_questiontext'];
                                $all_questions[$question_id]["questionblock_show_blocktitle"] = $questionblocks[$question_id]['show_blocktitle'];
                                $currentblock = $questionblocks[$question_id]['questionblock_id'];
                                $constraints = $this->getConstraints($question_id);
                                $all_questions[$question_id]["constraints"] = $constraints;
                        }
                        else
                        {
                                $pageindex++;
                                $all_questions[$question_id]['page'] = $pageindex;
                                $all_questions[$question_id]["questionblock_title"] = "";
                                $all_questions[$question_id]["questionblock_id"] = "";
                                $all_questions[$question_id]["questionblock_show_questiontext"] = 1;
                                $all_questions[$question_id]["questionblock_show_blocktitle"] = 1;
                                $currentblock = "";
                                $constraints = $this->getConstraints($question_id);
                                $all_questions[$question_id]["constraints"] = $constraints;
                        }
                        if (!isset($all_pages[$pageindex]))
                        {
                                $all_pages[$pageindex] = array();
                        }
                        array_push($all_pages[$pageindex], $all_questions[$question_id]);
                }
                // calculate position percentage for every page
                $max = count($all_pages);
                $counter = 1;
                foreach ($all_pages as $index => $block)
                {
                        foreach ($block as $blockindex => $question)
                        {
                                $all_pages[$index][$blockindex]["position"] = $counter / $max;
                        }
                        $counter++;
                }

                return $all_pages;
        }
        
        function getNextPage($active_page_question_id, $direction)
        {
                $foundpage = -1;
                $pages =& $this->getSurveyPages();
                if (strcmp($active_page_question_id, "") == 0)
                {
                        return $pages[0];
                }
                foreach ($pages as $key => $question_array)
                {
                        foreach ($question_array as $question)
                        {
                                if ($active_page_question_id == $question["question_id"])
                                {
                                        $foundpage = $key;
                                }
                        }
                }
                if ($foundpage == -1)
                {
                        // error: page not found
                }
                else
                {
                        $foundpage += $direction;
                        if ($foundpage < 0)
                        {
                                return 0;
                        }
                        if ($foundpage >= count($pages))
                        {
                                return 1;
                        }
                        return $pages[$foundpage];
                }
        }
                
        function &getAvailableQuestionpools($use_obj_id = false, $could_be_offline = false, $showPath = FALSE, $permission = "read")
        {
                include_once "./Modules/SurveyQuestionPool/classes/class.ilObjSurveyQuestionPool.php";
                return ilObjSurveyQuestionPool::_getAvailableQuestionpools($use_obj_id, $could_be_offline, $showPath, $permission);
        }
        
        function getPrecondition($id)
        {
                global $ilDB;
                
                $result_array = array();
                $result = $ilDB->queryF("SELECT svy_constraint.*, svy_relation.*, svy_qst_constraint.question_fi ref_question_fi FROM svy_qst_constraint, svy_constraint, ".
                        "svy_relation WHERE svy_constraint.relation_fi = svy_relation.relation_id AND ".
                        "svy_qst_constraint.constraint_fi = svy_constraint.constraint_id AND svy_constraint.constraint_id = %s",
                        array('integer'),
                        array($id)
                );
                $pc = array();
                if ($result->numRows())
                {
                        $pc = $ilDB->fetchAssoc($result);
                }
                return $pc;
        }
        
        function getConstraints($question_id)
        {
                global $ilDB;
                
                $result_array = array();
                $result = $ilDB->queryF("SELECT svy_constraint.*, svy_relation.* FROM svy_qst_constraint, svy_constraint, svy_relation ".
                        "WHERE svy_constraint.relation_fi = svy_relation.relation_id AND ".
                        "svy_qst_constraint.constraint_fi = svy_constraint.constraint_id AND svy_qst_constraint.question_fi = %s ".
                        "AND svy_qst_constraint.survey_fi = %s",
                        array('integer','integer'),
                        array($question_id, $this->getSurveyId())
                );
                while ($row = $ilDB->fetchAssoc($result))
                {       
                        include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                        $question_type = SurveyQuestion::_getQuestionType($row["question_fi"]);
                        SurveyQuestion::_includeClass($question_type);
                        $question = new $question_type();
                        $question->loadFromDb($row["question_fi"]);
                        $valueoutput = $question->getPreconditionValueOutput($row["value"]);
                        array_push($result_array, array("id" => $row["constraint_id"], "question" => $row["question_fi"], "short" => $row["shortname"], "long" => $row["longname"], "value" => $row["value"], "conjunction" => $row["conjunction"], "valueoutput" => $valueoutput));
                }
                return $result_array;
        }

        static function _getConstraints($survey_id)
        {
                global $ilDB;
                $result_array = array();
                $result = $ilDB->queryF("SELECT svy_qst_constraint.question_fi as for_question, svy_constraint.*, svy_relation.* ".
                        "FROM svy_qst_constraint, svy_constraint, svy_relation WHERE svy_constraint.relation_fi = svy_relation.relation_id ".
                        "AND svy_qst_constraint.constraint_fi = svy_constraint.constraint_id AND svy_qst_constraint.survey_fi = %s",
                        array('integer'),
                        array($survey_id)
                );
                while ($row = $ilDB->fetchAssoc($result))
                {               
                        array_push($result_array, array("id" => $row["constraint_id"], "for_question" => $row["for_question"], "question" => $row["question_fi"], "short" => $row["shortname"], "long" => $row["longname"], "relation_id" => $row["relation_id"], "value" => $row["value"], 'conjunction' => $row['conjunction']));
                }
                return $result_array;
        }


        function &getVariables($question_id)
        {
                global $ilDB;
                
                $result_array = array();
                $result = $ilDB->queryF("SELECT svy_variable.*, svy_category.title FROM svy_variable LEFT JOIN ".
                        "svy_category ON svy_variable.category_fi = svy_category.category_id WHERE svy_variable.question_fi = %s ".
                        "ORDER BY svy_variable.sequence",
                        array('integer'),
                        array($question_id)
                );
                while ($row = $ilDB->fetchObject($result))
                {
                        $result_array[$row->sequence] = $row;
                }
                return $result_array;
        }
        
        function addConstraint($if_question_id, $relation, $value, $conjunction)
        {
                global $ilDB;

                $next_id = $ilDB->nextId('svy_constraint');
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_constraint (constraint_id, question_fi, relation_fi, value, conjunction) VALUES ".
                        "(%s, %s, %s, %s, %s)",
                        array('integer','integer','integer','float', 'integer'),
                        array($next_id, $if_question_id, $relation, $value, $conjunction)
                );
                if ($affectedRows)
                {
                        return $next_id;
                }
                else
                {
                        return null;
                }
        }


        public function addConstraintToQuestion($to_question_id, $constraint_id)
        {
                global $ilDB;
                
                $next_id = $ilDB->nextId('svy_qst_constraint');
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_qst_constraint (question_constraint_id, survey_fi, question_fi, ".
                        "constraint_fi) VALUES (%s, %s, %s, %s)",
                        array('integer','integer','integer','integer'),
                        array($next_id, $this->getSurveyId(), $to_question_id, $constraint_id)
                );
        }
        
        function updateConstraint($precondition_id, $if_question_id, $relation, $value, $conjunction)
        {
                global $ilDB;
                $affectedRows = $ilDB->manipulateF("UPDATE svy_constraint SET question_fi = %s, relation_fi = %s, value = %s, conjunction = %s ".
                        "WHERE constraint_id = %s",
                        array('integer','integer','float','integer','integer'),
                        array($if_question_id, $relation, $value, $conjunction, $precondition_id)
                );
        }
                
        public function updateConjunctionForQuestions($questions, $conjunction)
        {
                global $ilDB;
                foreach ($questions as $question_id)
                {
                        $affectedRows = $ilDB->manipulateF("UPDATE svy_constraint SET conjunction = %s ".
                                "WHERE constraint_id IN (SELECT constraint_fi FROM svy_qst_constraint WHERE svy_qst_constraint.question_fi = %s)",
                                array('integer','integer'),
                                array($conjunction, $question_id)
                        );
                }
        }

        function getAllRelations($short_as_key = false)
        {
                global $ilDB;
                
                // #7987
                $custom_order = array("equal", "not_equal", "less", "less_or_equal", "more", "more_or_equal");
                $custom_order = array_flip($custom_order);
                
                $result_array = array();
                $result = $ilDB->query("SELECT * FROM svy_relation");
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if ($short_as_key)
                        {
                                $result_array[$row["shortname"]] = array("short" => $row["shortname"], "long" => $row["longname"], "id" => $row["relation_id"], "order" => $custom_order[$row["longname"]]);
                        }
                        else
                        {
                                $result_array[$row["relation_id"]] = array("short" => $row["shortname"], "long" => $row["longname"], "order" => $custom_order[$row["longname"]]);
                        }
                }               
                
                $result_array = ilUtil::sortArray($result_array, "order", "ASC", true, true);
                foreach($result_array as $idx => $item)
                {
                        unset($result_array[$idx]["order"]);
                }
                
                return $result_array;
        }

        public function disinviteAllUsers()
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT user_fi FROM svy_inv_usr WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $this->disinviteUser($row['user_fi']);
                }
        }

        public function disinviteUser($user_id)
        {
                global $ilDB;
                
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_inv_usr WHERE survey_fi = %s AND user_fi = %s",
                        array('integer','integer'),
                        array($this->getSurveyId(), $user_id)
                );
                include_once './Services/User/classes/class.ilObjUser.php';
                ilObjUser::_dropDesktopItem($user_id, $this->getRefId(), "svy");
        }

        function inviteUser($user_id)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT user_fi FROM svy_inv_usr WHERE user_fi = %s AND survey_fi = %s",
                        array('integer','integer'),
                        array($user_id, $this->getSurveyId())
                );
                if ($result->numRows() < 1)
                {
                        $next_id = $ilDB->nextId('svy_inv_usr');
                        $affectedRows = $ilDB->manipulateF("INSERT INTO svy_inv_usr (invited_user_id, survey_fi, user_fi, tstamp) " .
                                "VALUES (%s, %s, %s, %s)",
                                array('integer','integer','integer','integer'),
                                array($next_id, $this->getSurveyId(), $user_id, time())
                        );
                }
                if ($this->getInvitation() == self::INVITATION_ON)
                {
                        include_once './Services/User/classes/class.ilObjUser.php';
                        ilObjUser::_addDesktopItem($user_id, $this->getRefId(), "svy");
                }
        }

        function &getInvitedUsers()
        {
                global $ilDB;
                
                $result_array = array();
                $result = $ilDB->queryF("SELECT user_fi FROM svy_inv_usr WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                while ($row = $ilDB->fetchAssoc($result))
                {
                        array_push($result_array, $row["user_fi"]);
                }
                return $result_array;
        }

        function deleteWorkingData($question_id, $active_id)
        {
                global $ilDB;
                
                $affectedRows = $ilDB->manipulateF("DELETE FROM svy_answer WHERE question_fi = %s AND active_fi = %s",
                        array('integer','integer'),
                        array($question_id, $active_id)
                );
        }
        
        function loadWorkingData($question_id, $active_id)
        {
                global $ilDB;
                $result_array = array();
                $result = $ilDB->queryF("SELECT * FROM svy_answer WHERE question_fi = %s AND active_fi = %s",
                        array('integer','integer'),
                        array($question_id, $active_id)
                );
                if ($result->numRows() >= 1)
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                array_push($result_array, $row);
                        }
                        return $result_array;
                }
                else
                {
                        return $result_array;
                }
        }
        
        function startSurvey($user_id, $anonymous_id, $appraisee_id)
        {
                global $ilDB;
                
                if ($this->getAnonymize() && (strlen($anonymous_id) == 0)) return;

                if (strcmp($user_id, "") == 0)
                {
                        if ($user_id == ANONYMOUS_USER_ID)
                        {
                                $user_id = 0;
                        }
                }
                $next_id = $ilDB->nextId('svy_finished');
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_finished (finished_id, survey_fi, user_fi, anonymous_id, state, tstamp, appr_id) ".
                        "VALUES (%s, %s, %s, %s, %s, %s, %s)",
                        array('integer','integer','integer','text','text','integer','integer'),
                        array($next_id, $this->getSurveyId(), $user_id, $anonymous_id, 0, time(), $appraisee_id)
                );
                return $next_id;
        }

        function finishSurvey($finished_id)
        {
                global $ilDB;
                
                $ilDB->manipulateF("UPDATE svy_finished SET state = %s, tstamp = %s".
                        " WHERE survey_fi = %s AND finished_id = %s",
                        array('text','integer','integer','integer'),
                        array(1, time(), $this->getSurveyId(), $finished_id)
                );                      
                
                $this->checkTutorNotification();
        }

        function setPage($finished_id, $page_id)
        {
                global $ilDB;

                $affectedRows = $ilDB->manipulateF("UPDATE svy_finished SET lastpage = %s WHERE finished_id = %s",
                        array('integer','integer'),
                        array(($page_id) ? $page_id : 0, $finished_id)
                );
        }

        function sendNotificationMail($user_id, $anonymize_id, $appr_id)
        {               
                include_once "./Services/User/classes/class.ilObjUser.php";
                include_once "./Services/User/classes/class.ilUserUtil.php";    
                
                // #12755
                $placeholders = array(
                        "FIRST_NAME" => "firstname",
                        "LAST_NAME" => "lastname",              
                        "LOGIN" => "login",             
                        // old style
                        "firstname" => "firstname"
                );              

                $recipients = preg_split('/,/', $this->mailaddresses);
                foreach ($recipients as $recipient)
                {                                               
                        // #11298               
                        include_once "./Services/Notification/classes/class.ilSystemNotification.php";
                        $ntf = new ilSystemNotification();
                        $ntf->setLangModules(array("survey"));
                        $ntf->setRefId($this->getRefId());
                        $ntf->setSubjectLangId('finished_mail_subject');
                                                                
                        $messagetext = $this->mailparticipantdata;
                        if(trim($messagetext))
                        {                               
                                if (!$this->hasAnonymizedResults())
                                {
                                        $data = ilObjUser::_getUserData(array($user_id));
                                        $data = $data[0];
                                }
                                foreach ($placeholders as $key => $mapping)
                                {                                                                       
                                        if ($this->hasAnonymizedResults()) // #16480
                                        {
                                                $messagetext = str_replace('[' . $key . ']', '', $messagetext);
                                        }
                                        else
                                        {                                                                       
                                                $messagetext = str_replace('[' . $key . ']', trim($data[$mapping]), $messagetext);
                                        }
                                }               
                                $ntf->setIntroductionDirect($messagetext);
                        }
                        else
                        {
                                $ntf->setIntroductionLangId('survey_notification_finished_introduction');
                        }
                                                
                        // 360°? add appraisee data
                        if($appr_id)
                        {                                                                               
                                $ntf->addAdditionalInfo('survey_360_appraisee', 
                                        ilUserUtil::getNamePresentation($appr_id));
                        }
                        
                        $active_id = $this->getActiveID($user_id, $anonymize_id, $appr_id);
                        $ntf->addAdditionalInfo('results', 
                                $this->getParticipantTextResults($active_id), true);
                                                                        
                        $ntf->setGotoLangId('survey_notification_tutor_link');                          
                        $ntf->setReasonLangId('survey_notification_finished_reason');   

                        $ntf->sendMail(array($recipient), null, null);          
                }                                                                                                                       
        }

        protected function getParticipantTextResults($active_id)
        {
                $textresult = "";
                $userResults =& $this->getUserSpecificResults(array($active_id));
                $questions =& $this->getSurveyQuestions(true);
                $questioncounter = 1;
                foreach ($questions as $question_id => $question_data)
                {
                        $textresult .= $questioncounter++ . ". " . $question_data["title"] . "\n";
                        $found = $userResults[$question_id][$active_id];
                        $text = "";
                        if (is_array($found))
                        {
                                $text = implode("\n", $found);
                        }
                        else
                        {
                                $text = $found;
                        }
                        if (strlen($text) == 0) $text = self::getSurveySkippedValue();
                        $text = str_replace("<br />", "\n", $text);
                        $textresult .= $text . "\n\n";
                }
                return $textresult;
        }

        function isSurveyStarted($user_id, $anonymize_id, $appr_id = 0)
        {
                global $ilDB;

                // #15031 - should not matter if code was used by registered or anonymous (each code must be unique)
                if($anonymize_id)
                {
                        $result = $ilDB->queryF("SELECT * FROM svy_finished".
                                " WHERE survey_fi = %s AND anonymous_id = %s AND appr_id = %s",
                                array('integer','text','integer'),
                                array($this->getSurveyId(), $anonymize_id, $appr_id)
                        );
                }
                else
                {
                        $result = $ilDB->queryF("SELECT * FROM svy_finished".
                                " WHERE survey_fi = %s AND user_fi = %s AND appr_id = %s",
                                array('integer','integer','integer'),
                                array($this->getSurveyId(), $user_id, $appr_id)
                        );
                }
                if ($result->numRows() == 0)
                {
                        return false;
                }                       
                else
                {
                        $row = $ilDB->fetchAssoc($result);
                        // yes, we are doing it this way
                        $_SESSION["finished_id"][$this->getId()] = $row["finished_id"];
                        
                        return (int)$row["state"];
                }
        }

        function getActiveID($user_id, $anonymize_id, $appr_id)
        {
                global $ilDB;

                // see self::isSurveyStarted()
                
                // #15031 - should not matter if code was used by registered or anonymous (each code must be unique)
                if($anonymize_id)
                {
                        $result = $ilDB->queryF("SELECT finished_id FROM svy_finished".
                                " WHERE survey_fi = %s AND anonymous_id = %s AND appr_id = %s",
                                array('integer','text','integer'),
                                array($this->getSurveyId(), $anonymize_id, $appr_id)
                        );
                }
                else
                {
                        $result = $ilDB->queryF("SELECT finished_id FROM svy_finished".
                                " WHERE survey_fi = %s AND user_fi = %s AND appr_id = %s",
                                array('integer','integer','integer'),
                                array($this->getSurveyId(), $user_id, $appr_id)
                        );
                }
                if ($result->numRows() == 0)
                {
                        return false;
                }                       
                else
                {
                        $row = $ilDB->fetchAssoc($result);                      
                        return $row["finished_id"];
                }       
        }
        
        function getLastActivePage($active_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT lastpage FROM svy_finished WHERE finished_id = %s",
                        array('integer'),
                        array($active_id)
                );
                if ($result->numRows() == 0)
                {
                        return "";
                }
                else
                {
                        $row = $ilDB->fetchAssoc($result);
                        return ($row["lastpage"]) ? $row["lastpage"] : '';
                }
        }

        function checkConstraint($constraint_data, $working_data)
        {
                if (count($working_data) == 0)
                {
                        return 0;
                }
                
                if ((count($working_data) == 1) and (strcmp($working_data[0]["value"], "") == 0))
                {
                        return 0;
                }
                
                $found = false;
                foreach ($working_data as $data)
                {
                        switch ($constraint_data["short"])
                        {
                                case "<":
                                        if ($data["value"] < $constraint_data["value"])
                                        {
                                                $found = true;
                                        }
                                        break;
                                        
                                case "<=":
                                        if ($data["value"] <= $constraint_data["value"])
                                        {
                                                $found = true;
                                        }
                                        break;
                                
                                case "=":
                                        if ($data["value"] == $constraint_data["value"])
                                        {
                                                $found = true;
                                        }
                                        break;
                                                                                                                                                        
                                case "<>":
                                        if ($data["value"] <> $constraint_data["value"])
                                        {
                                                $found = true;
                                        }                                       
                                        break;
                                        
                                case ">=":                                      
                                        if ($data["value"] >= $constraint_data["value"])
                                        {
                                                $found = true;
                                        }                               
                                        break;
                                        
                                case ">":
                                        if ($data["value"] > $constraint_data["value"])
                                        {
                                                $found = true;
                                        }
                                        break;
                        }                                       
                        if ($found)
                        {
                                break;
                        }
                }
                
                return (int)$found;
        }
        
        static function _hasDatasets($survey_id)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT finished_id FROM svy_finished WHERE survey_fi = %s",
                        array('integer'),
                        array($survey_id)
                );
                return ($result->numRows()) ? true : false;
        }

        function &getSurveyFinishedIds()
        {
                global $ilDB, $ilLog;
                
                $users = array();
                $result = $ilDB->queryF("SELECT * FROM svy_finished WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                if ($result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                array_push($users, $row["finished_id"]);
                        }
                }
                return $users;
        }
        
        function getUserSpecificResults($finished_ids)
        {               
                $evaluation = array();
                
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                foreach (array_keys($this->getSurveyQuestions()) as $question_id)
                {
                        // get question instance                        
                        $question_type = SurveyQuestion::_getQuestionType($question_id);
                        SurveyQuestion::_includeClass($question_type);
                        $question = new $question_type();
                        $question->loadFromDb($question_id);
                        
                        $q_eval = SurveyQuestion::_instanciateQuestionEvaluation($question_id, $finished_ids);          
                        $q_res =  $q_eval->getResults();
                        
                        $data = array();
                        foreach($finished_ids as $user_id)
                        {
                                $data[$user_id] = $q_eval->parseUserSpecificResults($q_res, $user_id);                                  
                        }
                        
                        $evaluation[$question_id] = $data;                      
                }
                
                return $evaluation;
        }
        
        function getUserDataFromActiveId($active_id, $force_non_anonymous = false)
        {
                global $ilDB;

                $surveySetting = new ilSetting("survey");
                $use_anonymous_id = array_key_exists("use_anonymous_id", $_GET) ? $_GET["use_anonymous_id"] : $surveySetting->get("use_anonymous_id");
                $result = $ilDB->queryF("SELECT * FROM svy_finished WHERE finished_id = %s",
                        array('integer'),
                        array($active_id)
                );
                $row = array();
                $foundrows = $result->numRows();
                if ($foundrows)
                {
                        $row = $ilDB->fetchAssoc($result);
                }
                $name = ($use_anonymous_id) ? $row["anonymous_id"] : $this->lng->txt("anonymous");
                $userdata = array(
                        "fullname" => $name,
                        "sortname" => $name,
                        "firstname" => "",
                        "lastname" => "",
                        "login" => "",
                        "gender" => "",
                        "active_id" => "$active_id"
                );
                if ($foundrows)
                {
                        if (($row["user_fi"] > 0) && 
                                        (($row["user_fi"] != ANONYMOUS_USER_ID &&                               
                                                !$this->hasAnonymizedResults() &&
                                                !$this->get360Mode()) ||  // 360° uses ANONYMIZE_CODE_ALL which is wrong - see ilObjSurveyGUI::afterSave()
                                        (bool)$force_non_anonymous))
                        {
                                include_once './Services/User/classes/class.ilObjUser.php';
                                if (strlen(ilObjUser::_lookupLogin($row["user_fi"])) == 0)
                                {
                                        $userdata["fullname"] = $userdata["sortname"] = $this->lng->txt("deleted_user");
                                }
                                else
                                {
                                        $user = new ilObjUser($row["user_fi"]);
                                        $userdata["fullname"] = $user->getFullname();
                                        $gender = $user->getGender();
                                        if (strlen($gender) == 1) $gender = $this->lng->txt("gender_$gender");
                                        $userdata["gender"] = $gender;
                                        $userdata["firstname"] = $user->getFirstname();
                                        $userdata["lastname"] = $user->getLastname();
                                        $userdata["sortname"] = $user->getLastname() . ", " . $user->getFirstname();
                                        $userdata["login"] = $user->getLogin();
                                }
                        }
                }
                return $userdata;
        }
        
        function &getEvaluationByUser($questions, $active_id)
        {
                global $ilDB;
                
                // collect all answers
                $answers = array();
                $result = $ilDB->queryF("SELECT * FROM svy_answer WHERE active_fi = %s",
                        array('integer'),
                        array($active_id)
                );
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if (!is_array($answers[$row["question_fi"]]))
                        {
                                $answers[$row["question_fi"]] = array();
                        }
                        array_push($answers[$row["question_fi"]], $row);
                }
                $userdata = $this->getUserDataFromActiveId($active_id);
                $resultset = array(
                        "name" => $userdata["fullname"],
                        "firstname" => $userdata["firstname"],
                        "lastname" => $userdata["lastname"],
                        "login" => $userdata["login"],
                        "gender" => $userdata["gender"],
                        "answers" => array()
                );
                foreach ($questions as $key => $question)
                {
                        if (array_key_exists($key, $answers))
                        {
                                $resultset["answers"][$key] = $answers[$key];
                        }
                        else
                        {
                                $resultset["answers"][$key] = array();
                        }
                        sort($resultset["answers"][$key]);
                }
                return $resultset;
        }
        
        function getQuestionsTable($arrFilter)
        {
                global $ilUser;
                global $ilDB;
                $where = "";
                if (is_array($arrFilter))
                {
                        if (array_key_exists('title', $arrFilter) && strlen($arrFilter['title']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.title', 'text', "%%" . $arrFilter['title'] . "%%");
                        }
                        if (array_key_exists('description', $arrFilter) && strlen($arrFilter['description']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.description', 'text', "%%" . $arrFilter['description'] . "%%");
                        }
                        if (array_key_exists('author', $arrFilter) && strlen($arrFilter['author']))
                        {
                                $where .= " AND " . $ilDB->like('svy_question.author', 'text', "%%" . $arrFilter['author'] . "%%");
                        }
                        if (array_key_exists('type', $arrFilter) && strlen($arrFilter['type']))
                        {
                                $where .= " AND svy_qtype.type_tag = " . $ilDB->quote($arrFilter['type'], 'text');
                        }
                        if (array_key_exists('spl', $arrFilter) && strlen($arrFilter['spl']))
                        {
                                $where .= " AND svy_question.obj_fi = " . $ilDB->quote($arrFilter['spl'], 'integer');
                        }               
                }
                
                $spls =& $this->getAvailableQuestionpools($use_obj_id = TRUE, $could_be_offline = FALSE, $showPath = FALSE);
                $forbidden = "";
                $forbidden = " AND " . $ilDB->in('svy_question.obj_fi', array_keys($spls), false, 'integer');
                $forbidden .= " AND svy_question.complete = " . $ilDB->quote("1", 'text');
                $existing = "";
                $existing_questions =& $this->getExistingQuestions();
                if (count($existing_questions))
                {
                        $existing = " AND " . $ilDB->in('svy_question.question_id', $existing_questions, true, 'integer');
                }
                
                include_once "./Modules/SurveyQuestionPool/classes/class.ilObjSurveyQuestionPool.php";
                $trans = ilObjSurveyQuestionPool::_getQuestionTypeTranslations();
                
                $query_result = $ilDB->query("SELECT svy_question.*, svy_qtype.type_tag, svy_qtype.plugin, object_reference.ref_id".
                        " FROM svy_question, svy_qtype, object_reference".
                        " WHERE svy_question.original_id IS NULL".$forbidden.$existing.
                        " AND svy_question.obj_fi = object_reference.obj_id AND svy_question.tstamp > 0".
                        " AND svy_question.questiontype_fi = svy_qtype.questiontype_id " . $where);

                $rows = array();
                if ($query_result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($query_result))
                        {
                                if (array_key_exists('spl_txt', $arrFilter) && strlen($arrFilter['spl_txt']))
                                {
                                        if(!stristr($spls[$row["obj_fi"]], $arrFilter['spl_txt']))
                                        {
                                                continue;
                                        }
                                }
                                
                                $row['ttype'] = $trans[$row['type_tag']];
                                if ($row["plugin"])
                                {
                                        if ($this->isPluginActive($row["type_tag"]))
                                        {
                                                array_push($rows, $row);
                                        }
                                }
                                else
                                {
                                        array_push($rows, $row);
                                }
                        }
                }
                return $rows;
        }

        function getQuestionblocksTable($arrFilter)
        {
                global $ilUser, $ilDB;
                
                $where = "";
                if (is_array($arrFilter))
                {
                        if (array_key_exists('title', $arrFilter) && strlen($arrFilter['title']))
                        {
                                $where .= " AND " . $ilDB->like('svy_qblk.title', 'text', "%%" . $arrFilter['title'] . "%%");
                        }
                }
  
                $query_result = $ilDB->query("SELECT svy_qblk.*, svy_svy.obj_fi FROM svy_qblk , svy_qblk_qst, svy_svy WHERE ".
                        "svy_qblk.questionblock_id = svy_qblk_qst.questionblock_fi AND svy_svy.survey_id = svy_qblk_qst.survey_fi ".
                        "$where GROUP BY svy_qblk.questionblock_id, svy_qblk.title, svy_qblk.show_questiontext,  svy_qblk.show_blocktitle, ".
                        "svy_qblk.owner_fi, svy_qblk.tstamp, svy_svy.obj_fi");
                $rows = array();
                if ($query_result->numRows())
                {
                        $survey_ref_ids = ilUtil::_getObjectsByOperations("svy", "write");
                        $surveytitles = array();
                        foreach ($survey_ref_ids as $survey_ref_id)
                        {
                                $survey_id = ilObject::_lookupObjId($survey_ref_id);
                                $surveytitles[$survey_id] = ilObject::_lookupTitle($survey_id);                         
                        }
                        while ($row = $ilDB->fetchAssoc($query_result))
                        {
                                $questions_array =& $this->getQuestionblockQuestions($row["questionblock_id"]);
                                $counter = 1;
                                foreach ($questions_array as $key => $value)
                                {
                                        $questions_array[$key] = "$counter. $value";
                                        $counter++;
                                }
                                if (strlen($surveytitles[$row["obj_fi"]])) // only questionpools which are not in trash
                                {
                                        $rows[$row["questionblock_id"]] = array(
                                                "questionblock_id" => $row["questionblock_id"],
                                                "title" => $row["title"], 
                                                "svy" => $surveytitles[$row["obj_fi"]], 
                                                "contains" => join($questions_array, ", "),
                                                "owner" => $row["owner_fi"]
                                        );
                                }
                        }
                }
                return $rows;
        }

        function toXML()
        {
                include_once("./Services/Xml/classes/class.ilXmlWriter.php");
                $a_xml_writer = new ilXmlWriter;
                // set xml header
                $a_xml_writer->xmlHeader();
                $attrs = array(
                        "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance",
                        "xsi:noNamespaceSchemaLocation" => "http://www.ilias.de/download/xsd/ilias_survey_4_2.xsd"
                );
                $a_xml_writer->xmlStartTag("surveyobject", $attrs);
                $attrs = array(
                        "id" => $this->getSurveyId(),
                        "title" => $this->getTitle()
                );
                $a_xml_writer->xmlStartTag("survey", $attrs);
                
                $a_xml_writer->xmlElement("description", NULL, $this->getDescription());
                $a_xml_writer->xmlElement("author", NULL, $this->getAuthor());
                $a_xml_writer->xmlStartTag("objectives");
                $attrs = array(
                        "label" => "introduction"
                );
                $this->addMaterialTag($a_xml_writer, $this->getIntroduction(), TRUE, TRUE, $attrs);
                $attrs = array(
                        "label" => "outro"
                );
                $this->addMaterialTag($a_xml_writer, $this->getOutro(), TRUE, TRUE, $attrs);
                $a_xml_writer->xmlEndTag("objectives");

                if ($this->getAnonymize())
                {
                        $attribs = array("enabled" => "1");
                }
                else
                {
                        $attribs = array("enabled" => "0");
                }
                $a_xml_writer->xmlElement("anonymisation", $attribs);
                $a_xml_writer->xmlStartTag("restrictions");
                if ($this->getAnonymize() == 2)
                {
                        $attribs = array("type" => "free");
                }
                else
                {
                        $attribs = array("type" => "restricted");
                }
                $a_xml_writer->xmlElement("access", $attribs);
                if ($this->getStartDate())
                {
                        $attrs = array("type" => "date");                       
                        preg_match("/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/", $this->getStartDate(), $matches);
                        $a_xml_writer->xmlElement("startingtime", $attrs, sprintf("%04d-%02d-%02dT%02d:%02d:00", $matches[1], $matches[2], $matches[3], $matches[4], $matches[5], $matches[6]));
                }
                if ($this->getEndDate())
                {
                        $attrs = array("type" => "date");
                        preg_match("/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/", $this->getEndDate(), $matches);
                        $a_xml_writer->xmlElement("endingtime", $attrs, sprintf("%04d-%02d-%02dT%02d:%02d:00", $matches[1], $matches[2], $matches[3], $matches[4], $matches[5], $matches[6]));

                }
                $a_xml_writer->xmlEndTag("restrictions");
                
                // constraints
                $pages =& $this->getSurveyPages();
                $hasconstraints = FALSE;
                foreach ($pages as $question_array)
                {
                        foreach ($question_array as $question)
                        {
                                if (count($question["constraints"]))
                                {
                                        $hasconstraints = TRUE;
                                }
                        }
                }
                
                if ($hasconstraints)
                {
                        $a_xml_writer->xmlStartTag("constraints");
                        foreach ($pages as $question_array)
                        {
                                foreach ($question_array as $question)
                                {
                                        if (count($question["constraints"]))
                                        {
                                                // found constraints
                                                foreach ($question["constraints"] as $constraint)
                                                {                                                       
                                                        $attribs = array(
                                                                "sourceref" => $question["question_id"],
                                                                "destref" => $constraint["question"],
                                                                "relation" => $constraint["short"],
                                                                "value" => $constraint["value"],
                                                                "conjunction" => $constraint["conjunction"]
                                                        );
                                                        $a_xml_writer->xmlElement("constraint", $attribs);
                                                }
                                        }
                                }
                        }
                        $a_xml_writer->xmlEndTag("constraints");
                }
                
                // add the rest of the preferences in qtimetadata tags, because there is no correspondent definition in QTI
                $a_xml_writer->xmlStartTag("metadata");

                $custom_properties = array();
                $custom_properties["evaluation_access"] = $this->getEvaluationAccess();
                $custom_properties["status"] = $this->getStatus();
                $custom_properties["display_question_titles"] = $this->getShowQuestionTitles();
                $custom_properties["pool_usage"] = (int)$this->getPoolUsage();
                
                $custom_properties["own_results_view"] = (int)$this->hasViewOwnResults();
                $custom_properties["own_results_mail"] = (int)$this->hasMailOwnResults();
                $custom_properties["confirmation_mail"] = (int)$this->hasMailConfirmation();
                
                $custom_properties["anon_user_list"] = (int)$this->hasAnonymousUserList();
                
                $custom_properties["mode_360"] = (int)$this->get360Mode();
                $custom_properties["mode_360_self_eval"] = (int)$this->get360SelfEvaluation();
                $custom_properties["mode_360_self_rate"] = (int)$this->get360SelfRaters();
                $custom_properties["mode_360_self_appr"] = (int)$this->get360SelfAppraisee();
                $custom_properties["mode_360_results"] = $this->get360Results();
                $custom_properties["mode_360_skill_service"] = (int)$this->get360SkillService();
                
                
                // :TODO: skills?
                                
                // reminder/tutor notification are (currently?) not exportable
                
                foreach($custom_properties as $label => $value)
                {
                        $a_xml_writer->xmlStartTag("metadatafield");
                        $a_xml_writer->xmlElement("fieldlabel", NULL, $label);
                        $a_xml_writer->xmlElement("fieldentry", NULL, $value);
                        $a_xml_writer->xmlEndTag("metadatafield");
                }

                $a_xml_writer->xmlStartTag("metadatafield");
                $a_xml_writer->xmlElement("fieldlabel", NULL, "SCORM");
                include_once "./Services/MetaData/classes/class.ilMD.php";
                $md = new ilMD($this->getId(),0, $this->getType());
                $writer = new ilXmlWriter();
                $md->toXml($writer);
                $metadata = $writer->xmlDumpMem();
                $a_xml_writer->xmlElement("fieldentry", NULL, $metadata);
                $a_xml_writer->xmlEndTag("metadatafield");
                
                $a_xml_writer->xmlEndTag("metadata");
                $a_xml_writer->xmlEndTag("survey");

                $attribs = array("id" => $this->getId());
                $a_xml_writer->xmlStartTag("surveyquestions", $attribs);
                // add questionblock descriptions
                foreach ($pages as $question_array)
                {
                        if (count($question_array) > 1)
                        {
                                $attribs = array("id" => $question_array[0]["question_id"]);
                                $attribs = array("showQuestiontext" => $question_array[0]["questionblock_show_questiontext"],
                                        "showBlocktitle" => $question_array[0]["questionblock_show_blocktitle"]);
                                $a_xml_writer->xmlStartTag("questionblock", $attribs);
                                if (strlen($question_array[0]["questionblock_title"]))
                                {
                                        $a_xml_writer->xmlElement("questionblocktitle", NULL, $question_array[0]["questionblock_title"]);
                                }
                        }
                        foreach ($question_array as $question)
                        {
                                if (strlen($question["heading"]))
                                {
                                        $a_xml_writer->xmlElement("textblock", NULL, $question["heading"]);
                                }
                                $questionObject = self::_instanciateQuestion($question["question_id"]);
                                //questionObject contains all the fields from the database. (loadFromDb)
                                //we don't need the value from svy_qst_oblig table, we already have the values from svy_question table.
                                //if ($questionObject !== FALSE) $questionObject->insertXML($a_xml_writer, FALSE, $obligatory_states[$question["question_id"]]);
                                if ($questionObject !== FALSE) $questionObject->insertXML($a_xml_writer, FALSE);
                        }
                        if (count($question_array) > 1)
                        {
                                $a_xml_writer->xmlEndTag("questionblock");
                        }
                }

                $a_xml_writer->xmlEndTag("surveyquestions");
                $a_xml_writer->xmlEndTag("surveyobject");
                $xml = $a_xml_writer->xmlDumpMem(FALSE);
                return $xml;
        }

        static function _instanciateQuestion($question_id) 
        {
                if ($question_id < 1) return FALSE;
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                $question_type = SurveyQuestion::_getQuestionType($question_id);
                if (strlen($question_type) == 0) return FALSE;
                SurveyQuestion::_includeClass($question_type);
                $question = new $question_type();
                $question->loadFromDb($question_id);
                return $question;
        }

        function locateImportFiles($a_dir)
        {
                if (!is_dir($a_dir) || is_int(strpos($a_dir, "..")))
                {
                        return;
                }
                $importDirectory = "";
                $xmlFile = "";

                $current_dir = opendir($a_dir);
                $files = array();
                while($entryname = readdir($current_dir))
                {
                        $files[] = $entryname;
                }

                foreach($files as $file)
                {
                        if(is_dir($a_dir."/".$file) and ($file != "." and $file!=".."))
                        {
                                // found directory created by zip
                                $importDirectory = $a_dir."/".$file;
                        }
                }
                closedir($current_dir);
                if (strlen($importDirectory))
                {
                        // find the xml file
                        $current_dir = opendir($importDirectory);
                        $files = array();
                        while($entryname = readdir($current_dir))
                        {
                                $files[] = $entryname;
                        }
                        foreach($files as $file)
                        {
                                if(@is_file($importDirectory."/".$file) && 
                                        ($file != "." && $file!="..") && 
                                        (preg_match("/^[0-9]{10}__[0-9]+__(svy_)*[0-9]+\.[A-Za-z]{1,3}$/", $file) || 
                                                preg_match("/^[0-9]{10}__[0-9]+__(survey__)*[0-9]+\.[A-Za-z]{1,3}$/", $file)))
                                {
                                        // found xml file
                                        $xmlFile = $importDirectory."/".$file;
                                }
                        }
                }
                return array("dir" => $importDirectory, "xml" => $xmlFile);
        }

        function importObject($file_info, $svy_qpl_id)
        {
                if ($svy_qpl_id < 1) $svy_qpl_id = -1;
                // check if file was uploaded
                $source = $file_info["tmp_name"];
                $error = "";
                if (($source == 'none') || (!$source) || $file_info["error"] > UPLOAD_ERR_OK)
                {
                        $error = $this->lng->txt("import_no_file_selected");
                }
                // check correct file type
                $isXml = FALSE;
                $isZip = FALSE;
                if ((strcmp($file_info["type"], "text/xml") == 0) || (strcmp($file_info["type"], "application/xml") == 0))
                {
                        $this->log->debug("isXML");
                        $isXml = TRUE;
                }
                // too many different mime-types, so we use the suffix
                $suffix = pathinfo($file_info["name"]);
                if (strcmp(strtolower($suffix["extension"]), "zip") == 0)
                {
                        $this->log->debug("isZip");
                        $isZip = TRUE;
                }
                if (!$isXml && !$isZip)
                {
                        $error = $this->lng->txt("import_wrong_file_type");
                        $this->log->debug("Survey: Import error. Filetype was \"" . $file_info["type"] ."\"");
                }
                if (strlen($error) == 0)
                {
                        // import file as a survey
                        $import_dir = $this->getImportDirectory();
                        $import_subdir = "";
                        $importfile = "";
                        if ($isZip)
                        {
                                $importfile = $import_dir."/".$file_info["name"];
                                ilUtil::moveUploadedFile($source, $file_info["name"], $importfile);
                                ilUtil::unzip($importfile);
                                $found = $this->locateImportFiles($import_dir);
                                if (!((strlen($found["dir"]) > 0) && (strlen($found["xml"]) > 0)))
                                {
                                        $error = $this->lng->txt("wrong_import_file_structure");
                                        return $error;
                                }
                                $importfile = $found["xml"];
                                $import_subdir = $found["dir"];
                        }
                        else
                        {
                                $importfile = tempnam($import_dir, "survey_import");
                                ilUtil::moveUploadedFile($source, $file_info["name"], $importfile);
                        }

                        $this->log->debug("Import file = $importfile");
                        $this->log->debug("Import subdir = $import_subdir");

                        $fh = fopen($importfile, "r");
                        if (!$fh)
                        {
                                $error = $this->lng->txt("import_error_opening_file");
                                return $error;
                        }
                        $xml = fread($fh, filesize($importfile));
                        $result = fclose($fh);
                        if (!$result)
                        {
                                $error = $this->lng->txt("import_error_closing_file");
                                return $error;
                        }

                        unset($_SESSION["import_mob_xhtml"]);
                        if (strpos($xml, "questestinterop"))
                        {
                                include_once("./Modules/Survey/exceptions/class.ilInvalidSurveyImportFileException.php");
                                throw new ilInvalidSurveyImportFileException("Unsupported survey version (< 3.8) found.");
                                /*
                                include_once "./Services/Survey/classes/class.SurveyImportParserPre38.php";
                                $import = new SurveyImportParserPre38($svy_qpl_id, "", TRUE);
                                $import->setSurveyObject($this);
                                $import->setXMLContent($xml);
                                $import->startParsing();*/
                        }
                        else
                        {
                                $this->log->debug("survey id = ".$this->getId());
                                $this->log->debug("question pool id = ".$svy_qpl_id);

                                include_once("./Services/Export/classes/class.ilImport.php");
                                $imp = new ilImport();
                                $config = $imp->getConfig("Modules/Survey");
                                $config->setQuestionPoolID($svy_qpl_id);
                                $imp->getMapping()->addMapping("Modules/Survey", "svy", 0, $this->getId());
                                $imp->importFromDirectory($import_subdir, "svy", "Modules/Survey");
                                $this->log->debug("config(Modules/survey)->getQuestionPoolId =".$config->getQuestionPoolID());
                                return "";

                                //old code
                                include_once "./Services/Survey/classes/class.SurveyImportParser.php";
                                $import = new SurveyImportParser($svy_qpl_id, "", TRUE);
                                $import->setSurveyObject($this);
                                $import->setXMLContent($xml);
                                $import->startParsing();
                        }

                        if (is_array($_SESSION["import_mob_xhtml"]))
                        {
                                include_once "./Services/MediaObjects/classes/class.ilObjMediaObject.php";
                                include_once "./Services/RTE/classes/class.ilRTE.php";
                                include_once "./Modules/TestQuestionPool/classes/class.ilObjQuestionPool.php";
                                foreach ($_SESSION["import_mob_xhtml"] as $mob)
                                {
                                        $importfile = $import_subdir . "/" . $mob["uri"];
                                        if (file_exists($importfile))
                                        {                                               
                                                if (!$mob["type"])
                                                {
                                                        $mob["type"] = "svy:html";
                                                }
                                                
                                                $media_object = ilObjMediaObject::_saveTempFileAsMediaObject(basename($importfile), $importfile, FALSE);
                                                
                                                // survey mob
                                                if ($mob["type"] == "svy:html")
                                                {                                                                                                       
                                                        ilObjMediaObject::_saveUsage($media_object->getId(), "svy:html", $this->getId());
                                                        $this->setIntroduction(str_replace("src=\"" . $mob["mob"] . "\"", "src=\"" . "il_" . IL_INST_ID . "_mob_" . $media_object->getId() . "\"", $this->getIntroduction()));
                                                        $this->setOutro(str_replace("src=\"" . $mob["mob"] . "\"", "src=\"" . "il_" . IL_INST_ID . "_mob_" . $media_object->getId() . "\"", $this->getOutro()));
                                                }
                                                // question mob
                                                else if($import->questions[$mob["id"]])
                                                {
                                                        $new_qid = $import->questions[$mob["id"]];                                                      
                                                        ilObjMediaObject::_saveUsage($media_object->getId(), $mob["type"], $new_qid);                                           
                                                        $new_question = SurveyQuestion::_instanciateQuestion($new_qid);                 
                                                        $qtext = $new_question->getQuestiontext();
                                                        $qtext = ilRTE::_replaceMediaObjectImageSrc($qtext, 0);                                                 
                                                        $qtext = str_replace("src=\"" . $mob["mob"] . "\"", "src=\"" . "il_" . IL_INST_ID . "_mob_" . $media_object->getId() . "\"", $qtext);                                                   
                                                        $qtext = ilRTE::_replaceMediaObjectImageSrc($qtext, 1);                                                                 
                                                        $new_question->setQuestiontext($qtext);
                                                        $new_question->saveToDb();              
                                                        
                                                        // also fix existing original in pool
                                                        if($new_question->getOriginalId())
                                                        {
                                                                $pool_question = SurveyQuestion::_instanciateQuestion($new_question->getOriginalId());
                                                                $pool_question->setQuestiontext($qtext);
                                                                $pool_question->saveToDb();             
                                                        }
                                                }                                               
                                        }
                                        else
                                        {
                                                global $ilLog;
                                                $ilLog->write("Error: Could not open XHTML mob file for test introduction during test import. File $importfile does not exist!");
                                        }
                                }
                                $this->setIntroduction(ilRTE::_replaceMediaObjectImageSrc($this->getIntroduction(), 1));
                                $this->setOutro(ilRTE::_replaceMediaObjectImageSrc($this->getOutro(), 1));
                                $this->saveToDb();
                        }

                        // delete import directory
                        ilUtil::delDir($this->getImportDirectory());
                }
                return $error;
        }

        public function cloneObject($a_target_id,$a_copy_id = 0, $a_omit_tree = false)
        {
                global $ilDB;
                
                $this->loadFromDb();
                
                // Copy settings
                $newObj = parent::cloneObject($a_target_id,$a_copy_id, $a_omit_tree);
                $this->cloneMetaData($newObj);
                $newObj->updateMetaData();
                
                $newObj->setAuthor($this->getAuthor());
                $newObj->setIntroduction($this->getIntroduction());
                $newObj->setOutro($this->getOutro());
                $newObj->setEvaluationAccess($this->getEvaluationAccess());
                $newObj->setStartDate($this->getStartDate());
                $newObj->setEndDate($this->getEndDate());
                $newObj->setInvitation($this->getInvitation());
                $newObj->setInvitationMode($this->getInvitationMode());
                $newObj->setAnonymize($this->getAnonymize());
                $newObj->setShowQuestionTitles($this->getShowQuestionTitles());
                $newObj->setTemplate($this->getTemplate());
                $newObj->setPoolUsage($this->getPoolUsage());
                $newObj->setViewOwnResults($this->hasViewOwnResults());
                $newObj->setMailOwnResults($this->hasMailOwnResults());
                $newObj->setMailConfirmation($this->hasMailConfirmation());
                $newObj->setAnonymousUserList($this->hasAnonymousUserList());
                
                // #12661
                if($this->get360Mode())
                {
                        $newObj->set360Mode(true);
                        $newObj->set360SelfEvaluation($this->get360SelfEvaluation());
                        $newObj->set360SelfAppraisee($this->get360SelfAppraisee());
                        $newObj->set360SelfRaters($this->get360SelfRaters());
                        $newObj->set360Results($this->get360Results());
                        $newObj->set360SkillService($this->get360SkillService());                       
                }
                                
                // reminder/notification
                $newObj->setReminderStatus($this->getReminderStatus());
                $newObj->setReminderStart($this->getReminderStart());
                $newObj->setReminderEnd($this->getReminderEnd());
                $newObj->setReminderFrequency($this->getReminderFrequency());
                $newObj->setReminderTarget($this->getReminderTarget());
                $newObj->setReminderTemplate($this->getReminderTemplate());
                // reminder_last_sent must not be copied!
                $newObj->setTutorNotificationStatus($this->getTutorNotificationStatus());
                $newObj->setTutorNotificationRecipients($this->getTutorNotificationRecipients());
                $newObj->setTutorNotificationTarget($this->getTutorNotificationTarget());

                $question_pointer = array();
                // clone the questions
                $mapping = array();
                include_once "./Modules/SurveyQuestionPool/classes/class.SurveyQuestion.php";
                
                foreach ($this->questions as $key => $question_id)
                {
                        $question = self::_instanciateQuestion($question_id);
                        if($question) // #10824
                        {
                                $question->id = -1;
                                $original_id = SurveyQuestion::_getOriginalId($question_id, false);
                                $question->saveToDb($original_id);
                                $newObj->questions[$key] = $question->getId();
                                $question_pointer[$question_id] = $question->getId();
                                $mapping[$question_id] = $question->getId();                            
                        }
                }

                //copy online status if object is not the root copy object
                $cp_options = ilCopyWizardOptions::_getInstance($a_copy_id);

                if(!$cp_options->isRootNode($this->getRefId()))
                {
                        $newObj->setStatus($this->isOnline()?self::STATUS_ONLINE: self::STATUS_OFFLINE);
                }

                $newObj->saveToDb();            
                $newObj->cloneTextblocks($mapping);
                
                // #14929
                if($this->get360Mode() &&
                        $this->get360SkillService())
                {
                        include_once "./Modules/Survey/classes/class.ilSurveySkill.php";
                        $src_skills = new ilSurveySkill($this);
                        $tgt_skills = new ilSurveySkill($newObj);
                        
                        foreach($mapping as $src_qst_id => $tgt_qst_id)
                        {
                                $qst_skill = $src_skills->getSkillForQuestion($src_qst_id);
                                if($qst_skill)
                                {
                                        $tgt_skills->addQuestionSkillAssignment($tgt_qst_id, $qst_skill["base_skill_id"], $qst_skill["tref_id"]);
                                }
                        }
                }

                // clone the questionblocks
                $questionblocks = array();
                $questionblock_questions = array();
                $result = $ilDB->queryF("SELECT * FROM svy_qblk_qst WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                if ($result->numRows() > 0)
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                array_push($questionblock_questions, $row);
                                $questionblocks[$row["questionblock_fi"]] = $row["questionblock_fi"];
                        }
                }
                // create new questionblocks
                foreach ($questionblocks as $key => $value)
                {
                        $questionblock = self::_getQuestionblock($key); 
                        $questionblock_id = self::_addQuestionblock($questionblock["title"], $questionblock["owner_fi"], $questionblock["show_questiontext"], $questionblock["show_blocktitle"]);
                        $questionblocks[$key] = $questionblock_id;
                }
                // create new questionblock questions
                foreach ($questionblock_questions as $key => $value)
                {
                        if($questionblocks[$value["questionblock_fi"]] &&
                                $question_pointer[$value["question_fi"]])
                        {
                                $next_id = $ilDB->nextId('svy_qblk_qst');
                                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_qblk_qst (qblk_qst_id, survey_fi, questionblock_fi, question_fi) ".
                                        "VALUES (%s, %s, %s, %s)",
                                        array('integer','integer','integer','integer'),
                                        array($next_id, $newObj->getSurveyId(), $questionblocks[$value["questionblock_fi"]], $question_pointer[$value["question_fi"]])
                                );
                        }
                }
                
                // clone the constraints
                $constraints = self::_getConstraints($this->getSurveyId());
                $newConstraints = array();
                foreach ($constraints as $key => $constraint)
                {
                        if ($question_pointer[$constraint["for_question"]] &&
                                $question_pointer[$constraint["question"]])
                        {
                                if (!array_key_exists($constraint['id'], $newConstraints))
                                {
                                        $constraint_id = $newObj->addConstraint($question_pointer[$constraint["question"]], $constraint["relation_id"], $constraint["value"], $constraint['conjunction']);
                                        $newConstraints[$constraint['id']] = $constraint_id;
                                }
                                $newObj->addConstraintToQuestion($question_pointer[$constraint["for_question"]], $newConstraints[$constraint['id']]);
                        }
                }

                // #16210 - clone LP settings
                include_once('./Services/Tracking/classes/class.ilLPObjSettings.php');
                $obj_settings = new ilLPObjSettings($this->getId());
                $obj_settings->cloneSettings($newObj->getId());
                unset($obj_settings);
                
                return $newObj;
        }
        
        function getTextblock($question_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT * FROM svy_svy_qst WHERE question_fi = %s",
                        array('integer'),
                        array($question_id)
                );
                if ($result->numRows())
                {
                        $row = $ilDB->fetchAssoc($result);
                        return $row["heading"];
                }
                else
                {
                        return "";
                }
        }

        function cloneTextblocks($mapping)
        {
                foreach ($mapping as $original_id => $new_id)
                {
                        $textblock = $this->getTextblock($original_id);
                        include_once "./Services/AdvancedEditing/classes/class.ilObjAdvancedEditing.php";
                        $this->saveHeading(ilUtil::stripSlashes($textblock, TRUE, ilObjAdvancedEditing::_getUsedHTMLTagsAsString("survey")), $new_id);
                }
        }

        function createExportDirectory()
        {
                $svy_data_dir = ilUtil::getDataDir()."/svy_data";
                ilUtil::makeDir($svy_data_dir);
                if(!is_writable($svy_data_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Survey Data Directory (".$svy_data_dir.") not writeable.");
                }
                
                // create learning module directory (data_dir/lm_data/lm_<id>)
                $svy_dir = $svy_data_dir."/svy_".$this->getId();
                ilUtil::makeDir($svy_dir);
                if(!@is_dir($svy_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Creation of Survey Directory failed.");
                }
                // create Export subdirectory (data_dir/lm_data/lm_<id>/Export)
                $export_dir = $svy_dir."/export";
                ilUtil::makeDir($export_dir);
                if(!@is_dir($export_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Creation of Export Directory failed.");
                }
        }

        function getExportDirectory()
        {
                $export_dir = ilUtil::getDataDir()."/svy_data"."/svy_".$this->getId()."/export";

                return $export_dir;
        }
        
        function createImportDirectory()
        {
                $svy_data_dir = ilUtil::getDataDir()."/svy_data";
                ilUtil::makeDir($svy_data_dir);
                
                if(!is_writable($svy_data_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Survey Data Directory (".$svy_data_dir.") not writeable.");
                }

                // create test directory (data_dir/svy_data/svy_<id>)
                $svy_dir = $svy_data_dir."/svy_".$this->getId();
                ilUtil::makeDir($svy_dir);
                if(!@is_dir($svy_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Creation of Survey Directory failed.");
                }

                // create import subdirectory (data_dir/svy_data/svy_<id>/import)
                $import_dir = $svy_dir."/import";
                ilUtil::makeDir($import_dir);
                if(!@is_dir($import_dir))
                {
                        include_once "Modules/Survey/exceptions/class.ilSurveyException.php";
                        throw new ilSurveyException("Creation of Import Directory failed.");
                }
        }

        function getImportDirectory()
        {
                $import_dir = ilUtil::getDataDir()."/svy_data".
                        "/svy_".$this->getId()."/import";
                if (!is_dir($import_dir))
                {
                        ilUtil::makeDirParents($import_dir);
                }
                if(@is_dir($import_dir))
                {
                        return $import_dir;
                }
                else
                {
                        return false;
                }
        }
        
        function saveHeading($heading = "", $insertbefore)
        {
                global $ilDB;
                if ($heading)
                {
                        $affectedRows = $ilDB->manipulateF("UPDATE svy_svy_qst SET heading=%s WHERE survey_fi=%s AND question_fi=%s",
                                array('text','integer','integer'),
                                array($heading, $this->getSurveyId(), $insertbefore)
                        );
                }
                else
                {
                        $affectedRows = $ilDB->manipulateF("UPDATE svy_svy_qst SET heading=%s WHERE survey_fi=%s AND question_fi=%s",
                                array('text','integer','integer'),
                                array(NULL, $this->getSurveyId(), $insertbefore)
                        );
                }
        }

        function isAnonymousKey($key)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT anonymous_id FROM svy_anonymous WHERE survey_key = %s AND survey_fi = %s",
                        array('text','integer'),
                        array($key, $this->getSurveyId())
                );
                return ($result->numRows() == 1) ? true : false;
        }
        
        function bindSurveyCodeToUser($user_id, $code)
        {
                global $ilDB;
                
                if($user_id == ANONYMOUS_USER_ID)
                {
                        return;
                }
                
                if($this->checkSurveyCode($code))
                {               
                        $ilDB->manipulate("UPDATE svy_anonymous".
                                " SET user_key = ".$ilDB->quote(md5($user_id), "text").
                                " WHERE survey_key = ".$ilDB->quote($code, "text"));
                }
        }
        
        function isAnonymizedParticipant($key)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT finished_id FROM svy_finished WHERE anonymous_id = %s AND survey_fi = %s",
                        array('text','integer'),
                        array($key, $this->getSurveyId())
                );
                return ($result->numRows() == 1) ? true : false;
        }
        
        function checkSurveyCode($code)
        {
                if ($this->isAnonymousKey($code))
                {
                        if ($this->isSurveyStarted("", $code) == 1)
                        {
                                return false;
                        }
                        else
                        {
                                return true;
                        }
                }
                else
                {
                        return false;
                }
        }

        function getSurveyCodesForExport(array $a_codes = null, array $a_ids = null)
        {
                global $ilDB, $ilUser, $lng;
                
                include_once "./Services/Link/classes/class.ilLink.php";

                $sql = "SELECT svy_anonymous.*, svy_finished.state".
                        " FROM svy_anonymous".
                        " LEFT JOIN svy_finished ON (svy_anonymous.survey_key = svy_finished.anonymous_id)".
                        " WHERE svy_anonymous.survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND svy_anonymous.user_key IS NULL";
                
                if($a_codes)
                {
                        $sql .= " AND ".$ilDB->in("svy_anonymous.survey_key", $a_codes, "", "text");
                }
                else if($a_ids)
                {
                        $sql .= " AND ".$ilDB->in("svy_anonymous.anonymous_id", $a_ids, "", "text");
                }
                
                $export = array();
                
                // #14905
                $titles = array();
                $titles[] = '"'.$lng->txt("survey_code").'"';
                $titles[] = '"'.$lng->txt("email").'"';
                $titles[] = '"'.$lng->txt("lastname").'"';
                $titles[] = '"'.$lng->txt("firstname").'"';
                $titles[] = '"'.$lng->txt("create_date").'"';
                $titles[] = '"'.$lng->txt("used").'"';
                $titles[] = '"'.$lng->txt("mail_sent_short").'"';
                $titles[] = '"'.$lng->txt("survey_code_url").'"';
                $export[] = implode(";", $titles);
                                
                $result = $ilDB->query($sql);           
                $default_lang = $ilUser->getPref("survey_code_language");
                while ($row = $ilDB->fetchAssoc($result))
                {                       
                        $item = array();                                                
                        $item[] = $row["survey_key"];
                        
                        if($row["externaldata"])
                        {
                                $ext = unserialize($row["externaldata"]);
                                $item[] = $ext["email"];
                                $item[] = $ext["lastname"];
                                $item[] = $ext["firstname"];                            
                        }
                        else
                        {
                                $item[] = "";
                                $item[] = "";
                                $item[] = "";
                        }
                                                
                        // No relative (today, tomorrow...) dates in export.
                        $date = new ilDateTime($row['tstamp'],IL_CAL_UNIX);
                        $item[] = $date->get(IL_CAL_DATETIME);
                        
                        $item[] = ($this->isSurveyCodeUsed($row["survey_key"])) ? 1 : 0;
                        $item[] = ($row["sent"]) ? 1 : 0;
                        
                        $params = array("accesscode" => $row["survey_key"]);
                        if ($default_lang) 
                        {
                                $params["lang"] = $default_lang;
                        }
                        $item[] = ilLink::_getLink($this->getRefId(), "svy", $params);          
                                
                        $export[] = '"'.implode('";"', $item).'"';
                }
                return implode("\n", $export);
        }
        
        public function getSurveyCodesTableData(array $ids = null, $lang = null)
        {
                global $ilDB;
                
                include_once "./Services/Link/classes/class.ilLink.php";
                
                $codes = array();

                $sql = "SELECT svy_anonymous.*, svy_finished.state".
                        " FROM svy_anonymous".
                        " LEFT JOIN svy_finished ON (svy_anonymous.survey_key = svy_finished.anonymous_id)".
                        " WHERE svy_anonymous.survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer") /*.
                        " AND svy_anonymous.user_key IS NULL" */; // #15860
                
                if($ids)
                {
                        $sql .= " AND ".$ilDB->in("svy_anonymous.anonymous_id", $ids, "", "integer");
                }
                
                $sql .= " ORDER BY tstamp, survey_key ASC";                     
                $result = $ilDB->query($sql);                           
                if ($result->numRows() > 0)
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {                               
                                $href = "";                             
                                $used = false;
                                if ($this->isSurveyCodeUsed($row["survey_key"]))
                                {
                                        $used = true;
                                }
                                else
                                {
                                        $params = array("accesscode" => $row["survey_key"]);
                                        if ($lang)
                                        {
                                                $params["lang"] = $lang;
                                        }
                                        $href = ilLink::_getLink($this->getRefId(), "svy", $params);                                    
                                }
                                
                                
                                $item = array(
                                        'id' => $row["anonymous_id"],
                                        'code' => $row["survey_key"],
                                        'date' => $row["tstamp"], 
                                        'used' => $used, 
                                        'sent' => $row['sent'],
                                        'href' => $href,
                                        'email' => '',
                                        'last_name' => '',
                                        'first_name' => ''
                                );
                                
                                if($row["externaldata"])
                                {
                                        $ext = unserialize($row["externaldata"]);
                                        $item['email'] = $ext['email'];
                                        $item['last_name'] = $ext['lastname'];
                                        $item['first_name'] = $ext['firstname'];
                                }                               
                                                                                                
                                array_push($codes, $item);
                        }
                }
                return $codes;
        }

        function isSurveyCodeUsed($code)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT finished_id FROM svy_finished WHERE survey_fi = %s AND anonymous_id = %s",
                        array('integer','text'),
                        array($this->getSurveyId(), $code)
                );
                return ($result->numRows() > 0) ? true : false;
        }
        
        function isSurveyCodeUnique($code)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT anonymous_id FROM svy_anonymous WHERE survey_fi = %s AND survey_key = %s",
                        array('integer','text'),
                        array($this->getSurveyId(), $code)
                );
                return ($result->numRows() > 0) ? false : true;
        }
        
        function createSurveyCodes($nrOfCodes)
        {
                global $ilDB;
                
                $res = array();
                
                for ($i = 0; $i < $nrOfCodes; $i++)
                {
                        $next_id = $ilDB->nextId('svy_anonymous');
                        $ilDB->manipulateF("INSERT INTO svy_anonymous (anonymous_id, survey_key, survey_fi, tstamp) ".
                                "VALUES (%s, %s, %s, %s)",
                                array('integer','text','integer','integer'),
                                array($next_id, $this->createNewAccessCode(), $this->getSurveyId(), time())
                        );
                        $res[] = $next_id;
                }
                
                return $res;
        }
        
        function importSurveyCode($a_anonymize_key, $a_created, $a_data)
        {
                global $ilDB;
                
                $next_id = $ilDB->nextId('svy_anonymous');
                $ilDB->manipulateF("INSERT INTO svy_anonymous (anonymous_id, survey_key, survey_fi, externaldata, tstamp) ".
                        "VALUES (%s, %s, %s, %s, %s)",
                        array('integer','text','integer','text','integer'),
                        array($next_id, $a_anonymize_key, $this->getSurveyId(), serialize($a_data), $a_created)
                );
        }

        function createSurveyCodesForExternalData($data)
        {
                global $ilDB;
                
                $ids = array();
                foreach ($data as $dataset)
                {
                        $anonymize_key = $this->createNewAccessCode();
                        $next_id = $ilDB->nextId('svy_anonymous');
                        $affectedRows = $ilDB->manipulateF("INSERT INTO svy_anonymous (anonymous_id, survey_key, survey_fi, externaldata, tstamp) ".
                                "VALUES (%s, %s, %s, %s, %s)",
                                array('integer','text','integer','text','integer'),
                                array($next_id, $anonymize_key, $this->getSurveyId(), serialize($dataset), time())
                        );
                        $ids[] = $next_id;
                }
                return $ids;
        }

        function sendCodes($not_sent, $subject, $message, $lang)
        {
                global $DIC;
                /*
                 * 0 = all
                 * 1 = not sent
                 * 2 = finished
                 * 3 = not finished
                 */             
                $check_finished = ($not_sent > 1);
                
                include_once "./Services/Mail/classes/class.ilMail.php";
                include_once "./Services/Link/classes/class.ilLink.php";

                #19956
                $user_id = $DIC->user()->getId();
                $mail = new ilMail($user_id);
                $recipients = $this->getExternalCodeRecipients($check_finished);
                foreach ($recipients as $data)
                {
                        if($data['email'] && $data['code'])
                        {                               
                                $do_send = false;
                                switch ((int)$not_sent)
                                {
                                        case 1:
                                                $do_send = !(bool)$data['sent'];
                                                break;
                                        
                                        case 2:
                                                $do_send = $data['finished'];
                                                break;
                                        
                                        case 3:
                                                $do_send = !$data['finished'];
                                                break;
                                        
                                        default:
                                                $do_send = true;
                                                break;                                                                  
                                }                               
                                if ($do_send)
                                {                       
                                        // build text
                                        $messagetext = $message;
                                        $url = ilLink::_getLink($this->getRefId(), "svy",
                                                array(
                                                        "accesscode" => $data["code"],
                                                        "lang" => $lang
                                                ));                             
                                        $messagetext = str_replace('[url]', $url, $messagetext);
                                        foreach ($data as $key => $value)
                                        {
                                                $messagetext = str_replace('[' . $key . ']', $value, $messagetext);
                                        }
                                        
                                        // send mail
                                        $mail->sendMail(
                                                $data['email'], // to
                                                "", // cc
                                                "", // bcc
                                                $subject, // subject
                                                $messagetext, // message
                                                array(), // attachments
                                                array('normal') // type
                                        );      
                                }
                        }
                }

                global $ilDB;
                $ilDB->manipulateF("UPDATE svy_anonymous SET sent = %s WHERE survey_fi = %s AND externaldata IS NOT NULL",
                        array('integer','integer'),
                        array(1, $this->getSurveyId())
                );
        }

        function getExternalCodeRecipients($a_check_finished = false)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT survey_key code, externaldata, sent FROM svy_anonymous WHERE survey_fi = %s",
                        array('integer'),
                        array($this->getSurveyId())
                );
                $res = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if(!$row['externaldata'])
                        {
                                continue;                               
                        }
                        
                        $externaldata = unserialize($row['externaldata']);
                        if(!$externaldata['email'])
                        {
                                continue;
                        }
                        
                        $externaldata['code'] = $row['code'];
                        $externaldata['sent'] = $row['sent'];
                        
                        if($a_check_finished)
                        {                               
                                $externaldata['finished'] =  $this->isSurveyCodeUsed($row['code']);
                        }
                        
                        array_push($res, $externaldata);
                }
                return $res;
        }
        
        function deleteSurveyCode($survey_code)
        {
                global $ilDB;
                
                if (strlen($survey_code) > 0)
                {
                        $affectedRows = $ilDB->manipulateF("DELETE FROM svy_anonymous WHERE survey_fi = %s AND survey_key = %s",
                                array('integer', 'text'),
                                array($this->getSurveyId(), $survey_code)
                        );
                }
        }
        
        function getUserAccessCode($user_id)
        {
                global $ilDB;
                $access_code = "";
                $result = $ilDB->queryF("SELECT survey_key FROM svy_anonymous WHERE survey_fi = %s AND user_key = %s",
                        array('integer','text'),
                        array($this->getSurveyId(), md5($user_id))
                );
                if ($result->numRows())
                {
                        $row = $ilDB->fetchAssoc($result);
                        $access_code = $row["survey_key"];
                }
                return $access_code;
        }
        
        function saveUserAccessCode($user_id, $access_code)
        {
                global $ilDB;
                
                // not really sure what to do about ANONYMOUS_USER_ID
                
                $next_id = $ilDB->nextId('svy_anonymous');
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_anonymous (anonymous_id, survey_key, survey_fi, user_key, tstamp) ".
                        "VALUES (%s, %s, %s, %s, %s)",
                        array('integer','text', 'integer', 'text', 'integer'),
                        array($next_id, $access_code, $this->getSurveyId(), md5($user_id), time())
                );
        }
        
        function createNewAccessCode()
        {
                // create a 5 character code
                $codestring = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
                mt_srand();
                $code = "";
                for ($i = 1; $i <=5; $i++)
                {
                        $index = mt_rand(0, strlen($codestring)-1);
                        $code .= substr($codestring, $index, 1);
                }
                // verify it against the database
                while (!$this->isSurveyCodeUnique($code))
                {
                        $code = $this->createNewAccessCode();
                }
                return $code;
        }
        
        function getLastAccess($finished_id)
        {
                global $ilDB;
                
                $result = $ilDB->queryF("SELECT tstamp FROM svy_answer WHERE active_fi = %s ORDER BY tstamp DESC",
                        array('integer'),
                        array($finished_id)
                );
                if ($result->numRows())
                {
                        $row = $ilDB->fetchAssoc($result);
                        return $row["tstamp"];
                }
                else
                {
                        $result = $ilDB->queryF("SELECT tstamp FROM svy_finished WHERE finished_id = %s",
                                array('integer'),
                                array($finished_id)
                        );
                        if ($result->numRows())
                        {
                                $row = $ilDB->fetchAssoc($result);
                                return $row["tstamp"];
                        }
                }
                return "";
        }

        function prepareTextareaOutput($txt_output)
        {
                return ilUtil::prepareTextareaOutput($txt_output, $prepare_for_latex_output);
        }

        function isHTML($a_text)
        {
                if (preg_match("/<[^>]*?>/", $a_text))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE; 
                }
        }

        function addMaterialTag(&$a_xml_writer, $a_material, $close_material_tag = TRUE, $add_mobs = TRUE, $attribs = NULL)
        {
                include_once "./Services/RTE/classes/class.ilRTE.php";
                include_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");

                $a_xml_writer->xmlStartTag("material", $attribs);
                $attrs = array(
                        "type" => "text/plain"
                );
                if ($this->isHTML($a_material))
                {
                        $attrs["type"] = "text/xhtml";
                }
                $mattext = ilRTE::_replaceMediaObjectImageSrc($a_material, 0);
                $a_xml_writer->xmlElement("mattext", $attrs, $mattext);

                if ($add_mobs)
                {
                        $mobs = ilObjMediaObject::_getMobsOfObject("svy:html", $this->getId());
                        foreach ($mobs as $mob)
                        {
                                $mob_id = "il_" . IL_INST_ID . "_mob_" . $mob;
                                if (strpos($mattext, $mob_id) !== FALSE)
                                {
                                        $mob_obj = new ilObjMediaObject($mob);
                                        $imgattrs = array(
                                                "label" => $mob_id,
                                                "uri" => "objects/" . "il_" . IL_INST_ID . "_mob_" . $mob . "/" . $mob_obj->getTitle(),
                                                "type" => "svy:html",
                                                "id" => $this->getId()
                                        );
                                        $a_xml_writer->xmlElement("matimage", $imgattrs, NULL);
                                }
                        }
                }               
                if ($close_material_tag) $a_xml_writer->xmlEndTag("material");
        }

        function canExportSurveyCode()
        {
                if ($this->getAnonymize() != self::ANONYMIZE_OFF)
                {
                        if ($this->surveyCodeSecurity == FALSE)
                        {
                                return TRUE;
                        }
                }
                return FALSE;
        }

        function processPrintoutput2FO($print_output)
        {
                global $ilLog; 
                if (extension_loaded("tidy"))
                {
                        $config = array(
                                "indent"         => false,
                                "output-xml"     => true,
                                "numeric-entities" => true
                        );
                        $tidy = new tidy();
                        $tidy->parseString($print_output, $config, 'utf8');
                        $tidy->cleanRepair();
                        $print_output = tidy_get_output($tidy);
                        $print_output = preg_replace("/^.*?(<html)/", "\\1", $print_output);
                }
                else
                {
                        $print_output = str_replace("&nbsp;", "&#160;", $print_output);
                        $print_output = str_replace("&otimes;", "X", $print_output);
                        
                        // #17680 - metric questions use &#160; in print view
                        $print_output = str_replace("&gt;", "~|gt|~", $print_output);           // see #21550
                        $print_output = str_replace("&lt;", "~|lt|~", $print_output);
                        $print_output = str_replace("&#160;", "~|nbsp|~", $print_output);
                        $print_output = preg_replace('/&(?!amp)/', '&amp;', $print_output);
                        $print_output = str_replace("~|nbsp|~", "&#160;", $print_output);
                        $print_output = str_replace( "~|gt|~", "&gt;", $print_output);
                        $print_output = str_replace( "~|lt|~", "&lt;", $print_output);
                }
                $xsl = file_get_contents("./Modules/Survey/xml/question2fo.xsl");

                // additional font support
                $xsl = str_replace(
                                'font-family="Helvetica, unifont"',
                                'font-family="'.$GLOBALS['ilSetting']->get('rpc_pdf_font','Helvetica, unifont').'"',
                                $xsl
                );
                $args = array( '/_xml' => $print_output, '/_xsl' => $xsl );
                $xh = xslt_create();
                $params = array();
                try
                {
                        $output = xslt_process($xh, "arg:/_xml", "arg:/_xsl", null, $args, $params);
                }
                catch (Exception $e)
                {
                        $this->log->error("Print XSLT failed:");
                        $this->log->error("Content: ".$print_output);
                        $this->log->error("Xsl: ".$xsl);
                        throw ($e);
                }
                xslt_error($xh);
                xslt_free($xh);
                $ilLog->write($output);
                return $output;
        }
        
        function deliverPDFfromFO($fo)
        {
                global $ilLog;

                $fo_file = ilUtil::ilTempnam() . ".fo";
                $fp = fopen($fo_file, "w"); fwrite($fp, $fo); fclose($fp);

                include_once './Services/WebServices/RPC/classes/class.ilRpcClientFactory.php';
                try
                {
                        $pdf_base64 = ilRpcClientFactory::factory('RPCTransformationHandler')->ilFO2PDF($fo);
                        ilUtil::deliverData($pdf_base64->scalar, ilUtil::getASCIIFilename($this->getTitle()) . ".pdf", "application/pdf");
                        return true;
                }
                catch(Exception $e)
                {
                        $ilLog->write(__METHOD__.': '.$e->getMessage());
                        return false;
                }
        }

        function isPluginActive($a_pname)
        {
                global $ilPluginAdmin;
                if ($ilPluginAdmin->isActive(IL_COMP_MODULE, "SurveyQuestionPool", "svyq", $a_pname))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE;
                }
        }
        
        public function setSurveyId($survey_id)
        {
                $this->survey_id = $survey_id;
        }

        public function &getUserData($ids)
        {
                global $ilDB;

                if (!is_array($ids) || count($ids) ==0) return array();

                $result = $ilDB->query("SELECT usr_id, login, lastname, firstname FROM usr_data WHERE " . $ilDB->in('usr_id', $ids, false, 'integer') . " ORDER BY login");
                $result_array = array();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $result_array[$row["usr_id"]]= $row;
                }
                return $result_array;
        }

        function getMailNotification()
        {
                return $this->mailnotification;
        }
        
        function setMailNotification($a_notification)
        {
                $this->mailnotification = ($a_notification) ? true : false;
        }
        
        function getMailAddresses()
        {
                return $this->mailaddresses;
        }
        
        function setMailAddresses($a_addresses)
        {
                $this->mailaddresses = $a_addresses;
        }
        
        function getMailParticipantData()
        {
                return $this->mailparticipantdata;
        }
        
        function setMailParticipantData($a_data)
        {
                $this->mailparticipantdata = $a_data;
        }
        
        function setStartTime($finished_id, $first_question)
        {
                global $ilDB;
                $time = time();
                //primary for table svy_times
                $id =  $ilDB->nextId('svy_times');
                $_SESSION['svy_entered_page'] = $time;
                $affectedRows = $ilDB->manipulateF("INSERT INTO svy_times (id, finished_fi, entered_page, left_page, first_question) VALUES (%s, %s, %s, %s,%s)",
                        array('integer','integer', 'integer', 'integer', 'integer'),
                        array($id, $finished_id, $time, NULL, $first_question)
                );
        }
        
        function setEndTime($finished_id)
        {
                global $ilDB;
                $time = time();
                $affectedRows = $ilDB->manipulateF("UPDATE svy_times SET left_page = %s WHERE finished_fi = %s AND entered_page = %s",
                        array('integer', 'integer', 'integer'),
                        array($time, $finished_id, $_SESSION['svy_entered_page'])
                );
                unset($_SESSION['svy_entered_page']);
        }
        
        function getWorkingtimeForParticipant($finished_id)
        {
                global $ilDB;

                $result = $ilDB->queryF("SELECT * FROM svy_times WHERE finished_fi = %s",
                        array('integer'),
                        array($finished_id)
                );
                $total = 0;
                while ($row = $ilDB->fetchAssoc($result))
                {
                        if ($row['left_page'] > 0 && $row['entered_page'] > 0)
                                $total += $row['left_page'] - $row['entered_page'];
                }
                return $total;
        }

        function setTemplate($template_id)
        {
                $this->template_id = (int)$template_id;
        }

        function getTemplate()
        {
                return $this->template_id;
        }

        function updateOrder(array $a_order)
        {
                if(sizeof($this->questions) == sizeof($a_order))
                {
                        $this->questions = array_flip($a_order);
                        $this->saveQuestionsToDB();
                }               
        }

        function getPoolUsage()
        {
                return $this->pool_usage;
        }

        function setPoolUsage($a_value)
        {
                $this->pool_usage = (bool)$a_value;
        }

        function isPoolActive()
        {
                $use_pool = (bool)$this->getPoolUsage();
                $template_settings = $this->getTemplate();
                if($template_settings)
                {
                        include_once "Services/Administration/classes/class.ilSettingsTemplate.php";
                        $template_settings = new ilSettingsTemplate($template_settings);
                        $template_settings = $template_settings->getSettings();
                        $template_settings = $template_settings["use_pool"];
                        if($template_settings && $template_settings["hide"])
                        {
                                $use_pool = (bool)$template_settings["value"];
                        }
                }
                return $use_pool;
        }
        
        function applySettingsTemplate($template_id)
        {
                if(!$template_id)
                {
                        return;
                }
                
                include_once "Services/Administration/classes/class.ilSettingsTemplate.php";
                $template = new ilSettingsTemplate($template_id);
                $template_settings = $template->getSettings();
                if($template_settings)
                {
                        if($template_settings["show_question_titles"] !== NULL)
                        {
                                if($template_settings["show_question_titles"]["value"])
                                {
                                        $this->setShowQuestionTitles(true);
                                }
                                else
                                {
                                        $this->setShowQuestionTitles(false);
                                }
                        }

                        if($template_settings["use_pool"] !== NULL)
                        {
                                if($template_settings["use_pool"]["value"])
                                {
                                        $this->setPoolUsage(true);
                                }
                                else
                                {
                                        $this->setPoolUsage(false);
                                }
                        }

                        if($template_settings["anonymization_options"]["value"])
                        {
                                $anon_map = array('personalized' => self::ANONYMIZE_OFF,
                                        'anonymize_with_code' => self::ANONYMIZE_ON,
                                        'anonymize_without_code' => self::ANONYMIZE_FREEACCESS);
                                $this->setAnonymize($anon_map[$template_settings["anonymization_options"]["value"]]);
                        }

                        /* other settings: not needed here
                         * - enabled_end_date
                         * - enabled_start_date
                         * - rte_switch
                         */
                }

                $this->setTemplate($template_id);
                $this->saveToDb();
        }
        
        public function updateCode($a_id, $a_email, $a_last_name, $a_first_name, $a_sent)
        {
                global $ilDB;
                
                $a_email = trim($a_email);

                // :TODO:
                if(($a_email && !ilUtil::is_email($a_email)) || $a_email == "")
                {
                        return false;
                }
                
                $data = array("email" => $a_email,
                        "lastname" => trim($a_last_name),
                        "firstname" => trim($a_first_name));
                
                $fields = array(
                        "externaldata" => array("text", serialize($data)),
                        "sent" => array("integer", $a_sent)                     
                );
                
                $ilDB->update("svy_anonymous", $fields,
                        array("anonymous_id" => array("integer", $a_id)));

                return true;
        }
        
        
        //
        // 360° 
        // 
        
        public function set360Mode($a_value)
        {
                $this->mode_360 = (bool)$a_value;
        }
        
        public function get360Mode()
        {
                return (bool)$this->mode_360;
        }
        
        public function set360SelfEvaluation($a_value)
        {
                $this->mode_360_self_eval = (bool)$a_value;
        }
        
        public function get360SelfEvaluation()
        {
                return (bool)$this->mode_360_self_eval;
        }
        
        public function set360SelfAppraisee($a_value)
        {
                $this->mode_360_self_appr = (bool)$a_value;
        }
        
        public function get360SelfAppraisee()
        {
                return (bool)$this->mode_360_self_appr;
        }
        
        public function set360SelfRaters($a_value)
        {
                $this->mode_360_self_rate = (bool)$a_value;
        }
        
        public function get360SelfRaters()
        {
                return (bool)$this->mode_360_self_rate;
        }
        
        public function set360Results($a_value)
        {
                $this->mode_360_results = (int)$a_value;
        }
        
        public function get360Results()
        {
                return (int)$this->mode_360_results;
        }
        
        public function addAppraisee($a_user_id)
        {
                global $ilDB;
                
                if(!$this->isAppraisee($a_user_id) && 
                        $a_user_id != ANONYMOUS_USER_ID)
                {
                        $fields = array(
                                "obj_id" => array("integer", $this->getSurveyId()),
                                "user_id" => array("integer", $a_user_id)
                        );                      
                        $ilDB->insert("svy_360_appr", $fields);                 
                }                               
        }
        
        public function isAppraisee($a_user_id)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT user_id".
                        " FROM svy_360_appr".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer"));         
                return (bool)$ilDB->numRows($set);              
        }
        
        public function isAppraiseeClosed($a_user_id)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT has_closed".
                        " FROM svy_360_appr".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer"));         
                $row = $ilDB->fetchAssoc($set);
                return $row["has_closed"];                              
        }
        
        public function deleteAppraisee($a_user_id)
        {
                global $ilDB;
                
                $ilDB->manipulate("DELETE FROM svy_360_appr".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer"));         
                                
                $set = $ilDB->query("SELECT user_id".
                        " FROM svy_360_rater".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").               
                        " AND appr_id = ".$ilDB->quote($a_user_id, "integer"));         
                while($row = $ilDB->fetchAssoc($set))
                {                       
                        $this->deleteRater($a_user_id, $row["user_id"]);
                }               
                // appraisee will not be part of raters table
                if($this->get360SelfEvaluation())
                {
                        $this->deleteRater($a_user_id, $a_user_id);
                }
        }
        
        public function getAppraiseesData()
        {
                global $ilDB;
                
                $res = array();
                
                $set = $ilDB->query("SELECT * FROM svy_360_appr".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer"));              
                while($row = $ilDB->fetchAssoc($set))
                {               
                        $name = ilObjUser::_lookupName($row["user_id"]);
                        $name["email"] = ilObjUser::_lookupEmail($row["user_id"]);
                        $name["name"] = $name["lastname"].", ".$name["firstname"];
                        $res[$row["user_id"]] = $name;
                        
                        $finished = 0;
                        $raters = $this->getRatersData($row["user_id"]);        
                        foreach($raters as $rater)
                        {
                                if($rater["finished"])
                                {
                                        $finished++;
                                }
                        }
                        $res[$row["user_id"]]["finished"] = $finished."/".sizeof($raters);
                        $res[$row["user_id"]]["closed"] = $row["has_closed"];                   
                }
                
                return $res;
        }
        
        public function addRater($a_appraisee_id, $a_user_id, $a_anonymous_id = 0)
        {
                global $ilDB;
                
                if($this->isAppraisee($a_appraisee_id) &&
                        !$this->isRater($a_appraisee_id, $a_user_id, $a_anonymous_id))
                {
                        $fields = array(
                                "obj_id" => array("integer", $this->getSurveyId()),
                                "appr_id" => array("integer", $a_appraisee_id),
                                "user_id" => array("integer", $a_user_id),
                                "anonymous_id" => array("integer", $a_anonymous_id)
                        );                      
                        $ilDB->insert("svy_360_rater", $fields);                        
                }                               
        }
        
        public function isRater($a_appraisee_id, $a_user_id, $a_anonymous_id = 0)
        {
                global $ilDB;
                
                // user is rater if already appraisee and active self-evaluation
                if($this->isAppraisee($a_user_id) &&
                        $this->get360SelfEvaluation() && 
                        (!$a_appraisee_id || $a_appraisee_id == $a_user_id))
                {
                        return true;
                }
                                
                // :TODO: should we get rid of code as well?
                
                $sql = "SELECT user_id".
                        " FROM svy_360_rater".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").                       
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer").          
                        " AND anonymous_id = ".$ilDB->quote($a_anonymous_id, "integer");                
                if($a_appraisee_id)
                {
                        $sql .= " AND appr_id = ".$ilDB->quote($a_appraisee_id, "integer");
                }               
                $set = $ilDB->query($sql);              
                return (bool)$ilDB->numRows($set);              
        }
        
        public function deleteRater($a_appraisee_id, $a_user_id, $a_anonymous_id = 0)
        {
                global $ilDB;
                
                $finished_id = $this->getFinishedIdForAppraiseeIdAndRaterId($a_appraisee_id, $a_user_id);
                if($finished_id)
                {
                        $this->removeSelectedSurveyResults(array($finished_id));                
                }
                
                $ilDB->manipulate("DELETE FROM svy_360_rater".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND appr_id = ".$ilDB->quote($a_appraisee_id, "integer").             
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer").          
                        " AND anonymous_id = ".$ilDB->quote($a_anonymous_id, "integer"));                       
        }
        
        public function getRatersData($a_appraisee_id)
        {
                global $ilDB;
                
                $res = $anonymous_ids = array();
                
                $set = $ilDB->query("SELECT * FROM svy_360_rater".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").               
                        " AND appr_id = ".$ilDB->quote($a_appraisee_id, "integer"));            
                while($row = $ilDB->fetchAssoc($set))
                {                                                                               
                        if($row["anonymous_id"])
                        {                               
                                $res["a".$row["anonymous_id"]] = array(
                                        "lastname" => "unknown code ".$row["anonymous_id"],
                                        "sent" => $row["mail_sent"],
                                        "finished" => null
                                );
                                $anonymous_ids[] = $row["anonymous_id"];
                        }
                        else
                        {                       
                                $name = ilObjUser::_lookupName($row["user_id"]);
                                $name["name"] = $name["lastname"].", ".$name["firstname"];
                                $name["user_id"] = "u".$name["user_id"];
                                $name["email"] = ilObjUser::_lookupEmail($row["user_id"]);
                                $name["sent"] = $row["mail_sent"];
                                $name["finished"] = (bool)$this->is360SurveyStarted($a_appraisee_id, $row["user_id"]);
                                $res["u".$row["user_id"]] = $name;
                        }               
                }
                
                if(sizeof($anonymous_ids))
                {
                        $data = $this->getSurveyCodesTableData($anonymous_ids);
                        foreach($data as $item)
                        {
                                if(isset($res["a".$item["id"]]))
                                {                               
                                        $res["a".$item["id"]] = array(
                                                "user_id" => "a".$item["id"],
                                                "lastname" => $item["last_name"],
                                                "firstname" => $item["first_name"],
                                                "name" => $item["last_name"].", ".$item["first_name"],
                                                "login" => "",
                                                "email" => $item["email"],
                                                "code" => $item["code"],
                                                "href" => $item["href"],
                                                "sent" => $res["a".$item["id"]]["sent"],
                                                "finished" => (bool)$this->is360SurveyStarted($a_appraisee_id, null, $item["code"])
                                        );                                      
                                }
                        }
                }
                
                return $res;
        }
        
        public function getAppraiseesToRate($a_user_id, $a_anonymous_id = null)
        {
                global $ilDB;
        
                $res = array();
                
                $sql = "SELECT appr_id FROM svy_360_rater".
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer");
                
                if($a_user_id)
                {
                        $sql .= " AND user_id = ".$ilDB->quote($a_user_id, "integer");          
                }
                else
                {
                        $sql .= " AND anonymous_id = ".$ilDB->quote($a_anonymous_id, "integer");                
                }       
                                
                $set = $ilDB->query($sql);
                while($row = $ilDB->fetchAssoc($set))
                {               
                        $res[] = $row["appr_id"];
                }
                                
                // user may evaluate himself if already appraisee
                if($this->get360SelfEvaluation() && 
                        $this->isAppraisee($a_user_id) &&
                        !in_array($a_user_id, $res))
                {
                        $res[] = $a_user_id;                                    
                }
                
                return $res;
        }
        
        public function getAnonymousIdByCode($a_code)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT anonymous_id FROM svy_anonymous".
                                " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").            
                                " AND survey_key = ".$ilDB->quote($a_code, "text"));    
                $res = $ilDB->fetchAssoc($set);
                return $res["anonymous_id"];
        }
        
        function is360SurveyStarted($appr_id, $user_id, $anonymous_code = null)
        {
                global $ilDB;

                $sql = "SELECT * FROM svy_finished".
                        " WHERE survey_fi =".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND appr_id = ".$ilDB->quote($appr_id, "integer");                                    
                if ($user_id)
                {                       
                        $sql .= " AND user_fi = ".$ilDB->quote($user_id, "integer");
                }
                else
                {
                        $sql .= " AND anonymous_id = ".$ilDB->quote($anonymous_code, "text");
                }
                $result = $ilDB->query($sql);
                if ($result->numRows() == 0)
                {
                        return false;
                }                       
                else
                {
                        $row = $ilDB->fetchAssoc($result);                      
                        return (int)$row["state"];
                }
        }
        
        function getUserSurveyExecutionStatus($a_code = null)
        {
                global $ilUser, $ilDB;
                        
                $user_id = $ilUser->getId();
                                
                // code is obligatory?
                if(!$this->isAccessibleWithoutCode())
                {
                        if(!$a_code)
                        {
                                // registered raters do not need code
                                if($this->get360Mode() &&
                                        $user_id != ANONYMOUS_USER_ID && 
                                        $this->isRater(0, $user_id))
                                {
                                        // auto-generate code
                                        $a_code = $this->createNewAccessCode();         
                                        $this->saveUserAccessCode($user_id, $a_code);   
                                }
                                else
                                {
                                        return null;
                                }
                        }
                }               
                else if($user_id == ANONYMOUS_USER_ID ||
                        $this->getAnonymize() == self::ANONYMIZE_FREEACCESS)
                {
                        if(!$a_code)
                        {                       
                                // auto-generate code
                                $a_code = $this->createNewAccessCode();         
                                $this->saveUserAccessCode($user_id, $a_code);                                   
                        }
                }
                else
                {
                        $a_code = null;
                }
                        
                $res = array();
                                                                
                $sql = "SELECT * FROM svy_finished".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer");            
                // if proper user id is given, use it or current code
                if($user_id != ANONYMOUS_USER_ID)
                {
                        $sql .= " AND (user_fi = ".$ilDB->quote($user_id, "integer").
                                " OR anonymous_id = ".$ilDB->quote($a_code, "text").")";                
                }
                // use anonymous code to find finished id(s)
                else
                {
                        $sql .= " AND anonymous_id = ".$ilDB->quote($a_code, "text");   
                }
                $set = $ilDB->query($sql);
                while($row = $ilDB->fetchAssoc($set))
                {
                        $res[$row["finished_id"]] = array("appr_id" => $row["appr_id"],
                                "user_id" => $row["user_fi"],
                                "code" => $row["anonymous_id"],
                                "finished" => (bool)$row["state"]);
                }
                
                return array("code"=>$a_code, "runs"=>$res);
        }
        
        function findCodeForUser($a_user_id)
        {               
                global $ilDB;
                
                if($a_user_id != ANONYMOUS_USER_ID)
                {
                        $set = $ilDB->query("SELECT sf.anonymous_id FROM svy_finished sf".                              
                                " WHERE sf.survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                                " AND sf.user_fi = ".$ilDB->quote($a_user_id, "integer"));
                        $a_code = $ilDB->fetchAssoc($set);
                        return $a_code["anonymous_id"];
                }
        }
        
        function isUnusedCode($a_code, $a_user_id)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT user_fi FROM svy_finished".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND anonymous_id = ".$ilDB->quote($a_code, "text"));
                $user_id = $ilDB->fetchAssoc($set);
                $user_id = $user_id["user_fi"];
                
                if($user_id && ($user_id != $a_user_id || $user_id == ANONYMOUS_USER_ID))
                {
                        return false;
                }
                return true;
        }
        
        function getFinishedIdsForAppraiseeId($a_appr_id, $a_exclude_appraisee = false)
        {
                global $ilDB;
                
                $res = array();
                
                $set = $ilDB->query("SELECT finished_id, user_fi FROM svy_finished".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND appr_id = ".$ilDB->quote($a_appr_id, "integer"));
                while($row = $ilDB->fetchAssoc($set))
                {
                        if ($a_exclude_appraisee && $row["user_fi"] == $a_appr_id)
                        {
                                continue;
                        }
                        $res[] = $row["finished_id"];
                }
                
                return $res;
        }
        
        function getFinishedIdForAppraiseeIdAndRaterId($a_appr_id, $a_rat_id)
        {
                global $ilDB;
                
                $set = $ilDB->query("SELECT finished_id, user_fi FROM svy_finished".
                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND appr_id = ".$ilDB->quote($a_appr_id, "integer").
                        " AND user_fi = ".$ilDB->quote($a_rat_id, "integer"));
                $row = $ilDB->fetchAssoc($set);
                return $row["finished_id"];
        }
        
        
        // 360° using competence/skill service
        
        function set360SkillService($a_val)
        {
                $this->mode_360_skill_service = $a_val;
        }
        
        function get360SkillService()
        {
                return $this->mode_360_skill_service;
        }
        
        function set360RaterSent($a_appraisee_id, $a_user_id, $a_anonymous_id, $a_tstamp = null)
        {
                global $ilDB;
                
                if(!$a_tstamp)
                {
                        $a_tstamp = time();
                }
                
                $ilDB->manipulate("UPDATE svy_360_rater".
                        " SET mail_sent = ".$ilDB->quote($a_tstamp, "integer").
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND appr_id = ".$ilDB->quote($a_appraisee_id, "integer").             
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer").          
                        " AND anonymous_id = ".$ilDB->quote($a_anonymous_id, "integer"));       
        }
        
        function closeAppraisee($a_user_id)
        {
                global $ilDB;
                
                // close the appraisee
                $ilDB->manipulate("UPDATE svy_360_appr".
                        " SET has_closed = ".$ilDB->quote(time(), "integer").
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer").
                        " AND user_id = ".$ilDB->quote($a_user_id, "integer"));
                
                // write competences
                include_once("./Services/Skill/classes/class.ilSkillManagementSettings.php");
                $skmg_set = new ilSkillManagementSettings();
                if ($this->get360SkillService() && $skmg_set->isActivated())
                {
                        include_once("./Modules/Survey/classes/class.ilSurveySkill.php");
                        $sskill = new ilSurveySkill($this);
                        $sskill->writeAppraiseeSkills($a_user_id);
                }
        }
        
        function openAllAppraisees()
        {
                global $ilDB;
                
                $ilDB->manipulate("UPDATE svy_360_appr".
                        " SET has_closed = ".$ilDB->quote(null, "integer").
                        " WHERE obj_id = ".$ilDB->quote($this->getSurveyId(), "integer"));
        }
        
        public static function validateExternalRaterCode($a_ref_id, $a_code)
        {                               
                if(!isset($_SESSION["360_extrtr"][$a_ref_id]))
                {                       
                        $svy = new self($a_ref_id);
                        $svy->loadFromDB();
                        
                        if($svy->canStartSurvey(null, true) &&
                                $svy->get360Mode() &&
                                $svy->isAnonymousKey($a_code))
                        {                               
                                $anonymous_id = $svy->getAnonymousIdByCode($a_code);
                                if($anonymous_id)
                                {                                       
                                        if(sizeof($svy->getAppraiseesToRate(null, $anonymous_id)))
                                        {                                               
                                                $_SESSION["360_extrtr"][$a_ref_id] = true;
                                                return true;
                                        }
                                }                       
                        }

                        $_SESSION["360_extrtr"][$a_ref_id] = false;     
                        return false;
                }
                
                return $_SESSION["360_extrtr"][$a_ref_id];
        }
        
        
        //
        // reminder/notification
        // 
        
        public function getReminderStatus()
        {
                return (bool)$this->reminder_status;
        }
        
        public function setReminderStatus($a_value)
        {
                $this->reminder_status = (bool)$a_value;
        }
        
        public function getReminderStart()
        {
                return $this->reminder_start;
        }
        
        public function setReminderStart(ilDate $a_value = null)
        {
                $this->reminder_start = $a_value;
        }
        
        public function getReminderEnd()
        {
                return $this->reminder_end;
        }
        
        public function setReminderEnd(ilDate $a_value = null)
        {
                $this->reminder_end = $a_value;
        }
        
        public function getReminderFrequency()
        {
                return $this->reminder_frequency;
        }
        
        public function setReminderFrequency($a_value)
        {
                $this->reminder_frequency = (int)$a_value;
        }
        
        public function getReminderTarget()
        {
                return $this->reminder_target;
        }
        
        public function setReminderTarget($a_value)
        {
                $this->reminder_target = (int)$a_value;
        }
        
        public function getReminderLastSent()
        {
                return $this->reminder_last_sent;
        }
        
        public function setReminderLastSent($a_value)
        {
                $this->reminder_last_sent = $a_value;
        }
        
        public function getReminderTemplate()
        {
                return $this->reminder_tmpl;
        }
        
        public function setReminderTemplate($a_value)
        {               
                $this->reminder_tmpl = $a_value;
        }
        
        public function getTutorNotificationStatus()
        {
                return (bool)$this->tutor_ntf_status;
        }
        
        public function setTutorNotificationStatus($a_value)
        {
                $this->tutor_ntf_status = (bool)$a_value;
        }
        
        public function getTutorNotificationRecipients()
        {
                return $this->tutor_ntf_recipients;
        }
        
        public function setTutorNotificationRecipients(array $a_value)
        {
                $this->tutor_ntf_recipients = $a_value;                 
        }
        
        public function getTutorNotificationTarget()
        {
                return $this->tutor_ntf_target;
        }       
        
        public function setTutorNotificationTarget($a_value)
        {
                $this->tutor_ntf_target = (int)$a_value;
        }       
        
        protected function checkTutorNotification()
        {
                global $ilDB;
                
                if($this->getTutorNotificationStatus())
                {
                        $user_ids = $this->getNotificationTargetUserIds(($this->getTutorNotificationTarget() == self::NOTIFICATION_INVITED_USERS));
                        if($user_ids)
                        {
                                $set = $ilDB->query("SELECT COUNT(*) numall FROM svy_finished".
                                        " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                                        " AND state = ".$ilDB->quote(1, "integer").
                                        " AND ".$ilDB->in("user_fi", $user_ids, "", "integer"));
                                $row = $ilDB->fetchAssoc($set);
                                if($row["numall"] == sizeof($user_ids))
                                {
                                        $this->sendTutorNotification();
                                }
                        }                       
                }
        }

        public function getNotificationTargetUserIds($a_use_invited)
        {
                global $tree;
                
                if((bool)$a_use_invited)
                {
                        $user_ids = $this->getInvitedUsers();                           
                }
                else
                {
                        $parent_grp_ref_id = $tree->checkForParentType($this->getRefId(), "grp");
                        if($parent_grp_ref_id)
                        {
                                include_once "Modules/Group/classes/class.ilGroupParticipants.php";
                                $part = new ilGroupParticipants(ilObject::_lookupObjId($parent_grp_ref_id));
                                $user_ids = $part->getMembers();                                        
                        }
                        else
                        {
                                $parent_crs_ref_id = $tree->checkForParentType($this->getRefId(), "crs");
                                if($parent_crs_ref_id)
                                {
                                        include_once "Modules/Course/classes/class.ilCourseParticipants.php";
                                        $part = new ilCourseParticipants(ilObject::_lookupObjId($parent_crs_ref_id));
                                        $user_ids = $part->getMembers();                                        
                                }                               
                        }
                }
                return $user_ids;
        }
        
        protected function sendTutorNotification()
        {               
                include_once "./Services/Mail/classes/class.ilMail.php";
                include_once "./Services/User/classes/class.ilObjUser.php";
                include_once "./Services/Language/classes/class.ilLanguageFactory.php";
                include_once "./Services/User/classes/class.ilUserUtil.php";            
                include_once "./Services/Link/classes/class.ilLink.php";
                $link = ilLink::_getStaticLink($this->getRefId(), "svy");
                        
                foreach($this->getTutorNotificationRecipients() as $user_id)
                {                                                                                                                               
                        // use language of recipient to compose message
                        $ulng = ilLanguageFactory::_getLanguageOfUser($user_id);
                        $ulng->loadLanguageModule('survey');

                        $subject = sprintf($ulng->txt('survey_notification_tutor_subject'), $this->getTitle());
                        $message = sprintf($ulng->txt('survey_notification_tutor_salutation'), ilObjUser::_lookupFullname($user_id))."\n\n";

                        $message .= $ulng->txt('survey_notification_tutor_body').":\n\n";
                        $message .= $ulng->txt('obj_svy').": ". $this->getTitle()."\n";                 
                        $message .= "\n".$ulng->txt('survey_notification_tutor_link').": ".$link;                               

                        $mail_obj = new ilMail(ANONYMOUS_USER_ID);
                        $mail_obj->appendInstallationSignature(true);
                        $mail_obj->sendMail(ilObjUser::_lookupLogin($user_id),
                                "", "", $subject, $message, array(), array("system"));
                }
        }
        
        public function checkReminder()
        {
                global $ilDB, $ilAccess;
                
                $now = time();
                $now_with_format = date("YmdHis", $now);
                $today = date("Y-m-d");
                
                // object settings / participation period
                if($this->isOffline() ||
                        !$this->getReminderStatus() ||
                        ($this->getStartDate() && $now_with_format < $this->getStartDate()) ||
                        ($this->getEndDate() && $now_with_format > $this->getEndDate()))
                {
                        return false;
                }
                                                
                // reminder period
                $start = $this->getReminderStart();
                if($start)
                {
                        $start = $start->get(IL_CAL_DATE);
                }
                $end = $this->getReminderEnd();
                if($end)
                {
                        $end = $end->get(IL_CAL_DATE);
                }               
                if($today < $start ||
                        ($end && $today > $end))
                {
                        return false;
                }
                
                // object access period
                include_once "Services/Object/classes/class.ilObjectActivation.php";    
                $item_data = ilObjectActivation::getItem($this->getRefId());                            
                if($item_data["timing_type"] == ilObjectActivation::TIMINGS_ACTIVATION &&
                        ($now < $item_data["timing_start"] ||
                        $now > $item_data["timing_end"]))
                {
                        return false;
                }
                
                // check frequency
                $cut = new ilDate($today, IL_CAL_DATE);
                $cut->increment(IL_CAL_DAY, $this->getReminderFrequency()*-1);
                if(!$this->getReminderLastSent() ||
                        $cut->get(IL_CAL_DATE) >= substr($this->getReminderLastSent(), 0, 10))                                  
                {                               
                        $missing_ids = array();
                        
                        // #16871
                        $user_ids = $this->getNotificationTargetUserIds(($this->getReminderTarget() == self::NOTIFICATION_INVITED_USERS));
                        if($user_ids)
                        {
                                // gather participants who already finished
                                $finished_ids = array();
                                $set = $ilDB->query("SELECT user_fi FROM svy_finished".
                                " WHERE survey_fi = ".$ilDB->quote($this->getSurveyId(), "integer").
                                " AND state = ".$ilDB->quote(1, "text").
                                " AND ".$ilDB->in("user_fi", $user_ids, "", "integer"));
                                while($row = $ilDB->fetchAssoc($set))
                                {
                                        $finished_ids[] = $row["user_fi"];                                              
                                }

                                // some users missing out?
                                $missing_ids = array_diff($user_ids, $finished_ids);
                                if($missing_ids)
                                {
                                        foreach($missing_ids as $idx => $user_id)
                                        {
                                                // should be able to participate
                                                if(!$ilAccess->checkAccessOfUser($user_id, "read", "", $this->getRefId(), "svy", $this->getId()))
                                                {
                                                        unset($missing_ids[$idx]);
                                                }
                                        }
                                }                                                               
                                if($missing_ids)
                                {
                                        $this->sentReminder($missing_ids);
                                }
                        }

                        $this->setReminderLastSent($today);
                        $this->saveToDb();

                        return sizeof($missing_ids);
                }
                
                return false;
        }
        
        protected function sentReminder(array $a_recipient_ids)
        {
                include_once "./Services/Mail/classes/class.ilMail.php";
                        
                // use mail template            
                if($this->getReminderTemplate() &&
                        array_key_exists($this->getReminderTemplate(), $this->getReminderMailTemplates()))
                {
                        $prov = new ilMailTemplateDataProvider();
                        $tmpl = $prov->getTemplateById($this->getReminderTemplate());

                        $tmpl_params = array(                           
                                "ref_id" => $this->getRefId(),
                                "ts" => time()
                        );      
                }
                else
                {
                        $tmpl = null;
                        
                        include_once "./Services/Link/classes/class.ilLink.php";
                        $link = ilLink::_getStaticLink($this->getRefId(), "svy");       
                        
                        include_once "./Services/Language/classes/class.ilLanguageFactory.php";         
                }                       
                        
                foreach($a_recipient_ids as $user_id)
                {                                                                                                                               
                        if($tmpl)
                        {
                                $subject = $tmpl->getSubject();         
                                $message = $this->sentReminderPlaceholders($tmpl->getMessage(), $user_id, $tmpl_params);
                        }
                        // use lng
                        else
                        {
                                // use language of recipient to compose message
                                $ulng = ilLanguageFactory::_getLanguageOfUser($user_id);
                                $ulng->loadLanguageModule('survey');                                                    
                        
                                $subject = sprintf($ulng->txt('survey_reminder_subject'), $this->getTitle());
                                $message = sprintf($ulng->txt('survey_reminder_salutation'), ilObjUser::_lookupFullname($user_id))."\n\n";

                                $message .= $ulng->txt('survey_reminder_body').":\n\n";
                                $message .= $ulng->txt('obj_svy').": ". $this->getTitle()."\n";                 
                                $message .= "\n".$ulng->txt('survey_reminder_link').": ".$link;                 
                        }

                        $mail_obj = new ilMail(ANONYMOUS_USER_ID);
                        $mail_obj->appendInstallationSignature(true);
                        $mail_obj->sendMail(ilObjUser::_lookupLogin($user_id),
                                "", "", $subject, $message, array(), array("system"));
                }                                       
        }
        
        function setActivationStartDate($starting_time = NULL)
        {
                $this->activation_starting_time = $starting_time;
        }

        function setActivationEndDate($ending_time = NULL)
        {
                $this->activation_ending_time = $ending_time;
        }
        
        function getActivationStartDate()
        {
                return (strlen($this->activation_starting_time)) ? $this->activation_starting_time : NULL;
        }

        function getActivationEndDate()
        {
                return (strlen($this->activation_ending_time)) ? $this->activation_ending_time : NULL;
        }
        
        function setViewOwnResults($a_value)
        {
                $this->view_own_results = (bool)$a_value;
        }
        
        function hasViewOwnResults()
        {
                return $this->view_own_results;
        }
        
        function setMailOwnResults($a_value)
        {
                $this->mail_own_results = (bool)$a_value;
        }
        
        function hasMailOwnResults()
        {
                return $this->mail_own_results;
        }
        
        function setMailConfirmation($a_value)
        {
                $this->mail_confirmation = (bool)$a_value;
        }
        
        function hasMailConfirmation()
        {
                return $this->mail_confirmation;
        }
        
        function setAnonymousUserList($a_value)
        {
                $this->anon_user_list = (bool)$a_value;
        }
        
        function hasAnonymousUserList()
        {
                return $this->anon_user_list;
        }
        
        public static function getSurveySkippedValue()
        {               
                global $lng;
                
                // #13541
                
                include_once "./Services/Administration/classes/class.ilSetting.php";
                $surveySetting = new ilSetting("survey");
                if(!$surveySetting->get("skipped_is_custom", false))
                {
                        return $lng->txt("skipped");
                }
                else
                {
                        return $surveySetting->get("skipped_custom_value", "");
                }
        }
        
        public function getReminderMailTemplates()
        {       
                $res = array();
                
                include_once "Services/Mail/classes/class.ilMailTemplateDataProvider.php";
                include_once "Modules/Survey/classes/class.ilSurveyMailTemplateReminderContext.php";                    
                $mprov = new ilMailTemplateDataProvider();
                foreach($mprov->getTemplateByContexId(ilSurveyMailTemplateReminderContext::ID) as $tmpl)
                {
                        $res[$tmpl->getTplId()] = $tmpl->getTitle();
                }
                
                return $res;
        }
                
        protected function sentReminderPlaceholders($a_message, $a_user_id, array $a_context_params)
        {
                // see ilMail::replacePlaceholders()
                include_once "Modules/Survey/classes/class.ilSurveyMailTemplateReminderContext.php";                    
                                
                try
                {                       
                        require_once 'Services/Mail/classes/class.ilMailTemplateService.php';
                        $context = ilMailTemplateService::getTemplateContextById(ilSurveyMailTemplateReminderContext::ID);

                        $user = new ilObjUser($a_user_id);

                        require_once 'Services/Mail/classes/class.ilMailTemplatePlaceholderResolver.php';
                        require_once 'Services/Mail/classes/class.ilMailFormCall.php';
                        $processor = new ilMailTemplatePlaceholderResolver($context, $a_message);
                        $a_message = $processor->resolve($user, ilMailFormCall::getContextParameters());
                        
                }
                catch(Exception $e)
                {
                        require_once './Services/Logging/classes/public/class.ilLoggerFactory.php';
                        ilLoggerFactory::getLogger('mail')->error(__METHOD__ . ' has been called with invalid context.');
                }
                
                return $a_message;
        }       
        
} // END class.ilObjSurvey

?>