class.ilExAssignment.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilExAssignment
{
    protected $db;

    protected $lng;

    protected $user;

    protected $app_event_handler;

    const TYPE_UPLOAD = 1;
    const TYPE_BLOG = 2;
    const TYPE_PORTFOLIO = 3;
    const TYPE_UPLOAD_TEAM = 4;
    const TYPE_TEXT = 5;
    
    const FEEDBACK_DATE_DEADLINE = 1;
    const FEEDBACK_DATE_SUBMISSION = 2;
    
    const PEER_REVIEW_VALID_NONE = 1;
    const PEER_REVIEW_VALID_ONE = 2;
    const PEER_REVIEW_VALID_ALL = 3;
    
    protected $id;
    protected $exc_id;
    protected $type;
    protected $start_time;
    protected $deadline;
    protected $deadline2;
    protected $instruction;
    protected $title;
    protected $mandatory;
    protected $order_nr;
    protected $peer;
    protected $peer_min;
    protected $peer_unlock;
    protected $peer_dl;
    protected $peer_valid;
    protected $peer_file;
    protected $peer_personal;
    protected $peer_char;
    protected $peer_text;
    protected $peer_rating;
    protected $peer_crit_cat;
    protected $feedback_file;
    protected $feedback_cron;
    protected $feedback_date;
    protected $team_tutor = false;
    protected $max_file;
    protected $portfolio_template;
    protected $min_char_limit;
    protected $max_char_limit;
    
    protected $member_status = array(); // [array]

    protected $log;

    public function __construct($a_id = 0)
    {
        global $DIC;

        $this->db = $DIC->database();
        $this->lng = $DIC->language();
        $this->user = $DIC->user();
        $this->app_event_handler = $DIC["ilAppEventHandler"];
        $this->setType(self::TYPE_UPLOAD);
        $this->setFeedbackDate(self::FEEDBACK_DATE_DEADLINE);

        $this->log = ilLoggerFactory::getLogger("exc");
        
        if ($a_id > 0) {
            $this->setId($a_id);
            $this->read();
        }
    }
            
    public static function getInstancesByExercise($a_exc_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $set = $ilDB->query("SELECT * FROM exc_assignment " .
            " WHERE exc_id = " . $ilDB->quote($a_exc_id, "integer") .
            " ORDER BY order_nr ASC");
        $data = array();

        $order_val = 10;
        while ($rec = $ilDB->fetchAssoc($set)) {
            // ???
            $rec["order_val"] = $order_val;
            
            $ass = new self();
            $ass->initFromDB($rec);
            $data[] = $ass;
            
            $order_val += 10;
        }
        
        return $data;
    }

    public static function instructionFileGetFileOrderData($a_file_data, $a_ass_id)
    {
        global $DIC;

        $db = $DIC->database();
        $db->setLimit(1, 0);

        $result_order_val = $db->query("
                                SELECT id, order_nr
                                FROM exc_ass_file_order
                                WHERE assignment_id = {$db->quote($a_ass_id, 'integer')}
                                AND filename = {$db->quote($a_file_data['entry'], 'string')}
                        ");

        $order_val = 0;
        $order_id = 0;
        while ($row = $db->fetchAssoc($result_order_val)) {
            $order_val = (int) $row['order_nr'];
            $order_id = (int) $row['id'];
        }
        return array($order_val, $order_id);
    }

    public function hasTeam()
    {
        return $this->type == self::TYPE_UPLOAD_TEAM;
    }
    
    public function setId($a_val)
    {
        $this->id = $a_val;
    }
    
    public function getId()
    {
        return $this->id;
    }

    public function setExerciseId($a_val)
    {
        $this->exc_id = $a_val;
    }
    
    public function getExerciseId()
    {
        return $this->exc_id;
    }
    
    public function setStartTime($a_val)
    {
        $this->start_time = $a_val;
    }
    
    public function getStartTime()
    {
        return $this->start_time;
    }

    public function setDeadline($a_val)
    {
        $this->deadline = $a_val;
    }
    
    public function getDeadline()
    {
        return $this->deadline;
    }
    
    public function getPersonalDeadline($a_user_id)
    {
        $ilDB = $this->db;
        
        $is_team = false;
        if ($this->getType() == self::TYPE_UPLOAD_TEAM) {
            include_once("./Modules/Exercise/classes/class.ilExAssignmentTeam.php");
            $team_id = ilExAssignmentTeam::getTeamId($this->getId(), $a_user_id);
            if (!$team_id) {
                // #0021043
                $this->getDeadline();
            }
            $a_user_id = $team_id;
            $is_team = true;
        }
        
        $set = $ilDB->query("SELECT tstamp FROM exc_idl" .
            " WHERE ass_id = " . $ilDB->quote($this->getId(), "integer") .
            " AND member_id = " . $ilDB->quote($a_user_id, "integer") .
            " AND is_team = " . $ilDB->quote($is_team, "integer"));
        $row = $ilDB->fetchAssoc($set);
        
        // use assignment deadline if no direct personal
        return max($row["tstamp"], $this->getDeadline());
    }
    
    protected function getLastPersonalDeadline()
    {
        $ilDB = $this->db;
        
        $set = $ilDB->query("SELECT MAX(tstamp) FROM exc_idl" .
            " WHERE ass_id = " . $ilDB->quote($this->getId(), "integer"));
        $row = $ilDB->fetchAssoc($set);
        return $row["tstamp"];
    }
    
    public function setExtendedDeadline($a_val)
    {
        if ($a_val !== null) {
            $a_val = (int) $a_val;
        }
        $this->deadline2 = $a_val;
    }
    
    public function getExtendedDeadline()
    {
        return $this->deadline2;
    }

    public function setInstruction($a_val)
    {
        $this->instruction = $a_val;
    }
    
    public function getInstruction()
    {
        return $this->instruction;
    }

    public function setTitle($a_val)
    {
        $this->title = $a_val;
    }
    
    public function getTitle()
    {
        return $this->title;
    }

    public function setMandatory($a_val)
    {
        $this->mandatory = $a_val;
    }
    
    public function getMandatory()
    {
        return $this->mandatory;
    }

    public function setOrderNr($a_val)
    {
        $this->order_nr = $a_val;
    }
    
    public function getOrderNr()
    {
        return $this->order_nr;
    }
    
    public function setType($a_value)
    {
        if ($this->isValidType($a_value)) {
            $this->type = (int) $a_value;
            
            if ($this->type == self::TYPE_UPLOAD_TEAM) {
                $this->setPeerReview(false);
            }
        }
    }
    
    public function getType()
    {
        return $this->type;
    }
    
    public function isValidType($a_value)
    {
        if (in_array((int) $a_value, array(self::TYPE_UPLOAD, self::TYPE_BLOG,
            self::TYPE_PORTFOLIO, self::TYPE_UPLOAD_TEAM, self::TYPE_TEXT))) {
            return true;
        }
        return false;
    }
    
    public function setPeerReview($a_value)
    {
        $this->peer = (bool) $a_value;
    }
    
    public function getPeerReview()
    {
        return (bool) $this->peer;
    }
    
    public function setPeerReviewMin($a_value)
    {
        $this->peer_min = (int) $a_value;
    }
    
    public function getPeerReviewMin()
    {
        return (int) $this->peer_min;
    }
    
    public function setPeerReviewSimpleUnlock($a_value)
    {
        $this->peer_unlock = (bool) $a_value;
    }
    
    public function getPeerReviewSimpleUnlock()
    {
        return (bool) $this->peer_unlock;
    }
    
    public function setPeerReviewDeadline($a_val)
    {
        $this->peer_dl = $a_val;
    }
    
    public function getPeerReviewDeadline()
    {
        return $this->peer_dl;
    }
    
    public function setPeerReviewValid($a_value)
    {
        $this->peer_valid = (int) $a_value;
    }
    
    public function getPeerReviewValid()
    {
        return (int) $this->peer_valid;
    }
    
    public function setPeerReviewRating($a_val)
    {
        $this->peer_rating = (bool) $a_val;
    }
    
    public function hasPeerReviewRating()
    {
        return $this->peer_rating;
    }
    
    public function setPeerReviewText($a_val)
    {
        $this->peer_text = (bool) $a_val;
    }
    
    public function hasPeerReviewText()
    {
        return $this->peer_text;
    }
    
    public function setPeerReviewFileUpload($a_val)
    {
        $this->peer_file = (bool) $a_val;
    }
    
    public function hasPeerReviewFileUpload()
    {
        return $this->peer_file;
    }
    
    public function setPeerReviewPersonalized($a_val)
    {
        $this->peer_personal = (bool) $a_val;
    }
    
    public function hasPeerReviewPersonalized()
    {
        return $this->peer_personal;
    }
    
    public function setPeerReviewChars($a_value)
    {
        $a_value = (is_numeric($a_value) && (int) $a_value > 0)
            ? (int) $a_value
            : null;
        $this->peer_char = $a_value;
    }
    
    public function getPeerReviewChars()
    {
        return $this->peer_char;
    }
    
    public function setPeerReviewCriteriaCatalogue($a_value)
    {
        $a_value = is_numeric($a_value)
            ? (int) $a_value
            : null;
        $this->crit_cat = $a_value;
    }
    
    public function getPeerReviewCriteriaCatalogue()
    {
        return $this->crit_cat;
    }
    
    public function getPeerReviewCriteriaCatalogueItems()
    {
        include_once "Modules/Exercise/classes/class.ilExcCriteria.php";
        
        if ($this->crit_cat) {
            return ilExcCriteria::getInstancesByParentId($this->crit_cat);
        } else {
            $res = array();
            
            if ($this->peer_rating) {
                $res[] = ilExcCriteria::getInstanceByType("rating");
            }
            
            if ($this->peer_text) {
                $crit = ilExcCriteria::getInstanceByType("text");
                if ($this->peer_char) {
                    $crit->setMinChars($this->peer_char);
                }
                $res[] = $crit;
            }
            
            if ($this->peer_file) {
                $res[] = ilExcCriteria::getInstanceByType("file");
            }
            
            return $res;
        }
    }
    
    public function setFeedbackFile($a_value)
    {
        $this->feedback_file = (string) $a_value;
    }
    
    public function getFeedbackFile()
    {
        return (string) $this->feedback_file;
    }
    
    public function setFeedbackCron($a_value)
    {
        $this->feedback_cron = (string) $a_value;
    }
    
    public function hasFeedbackCron()
    {
        return (bool) $this->feedback_cron;
    }
    
    public function setFeedbackDate($a_value)
    {
        $this->feedback_date = (int) $a_value;
    }
    
    public function getFeedbackDate()
    {
        return (int) $this->feedback_date;
    }
    
    public function setTeamTutor($a_value)
    {
        $this->team_tutor = (bool) $a_value;
    }
    
    public function getTeamTutor()
    {
        return $this->team_tutor;
    }
    
    public function setMaxFile($a_value)
    {
        if ($a_value !== null) {
            $a_value = (int) $a_value;
        }
        $this->max_file = $a_value;
    }
    
    public function getMaxFile()
    {
        return $this->max_file;
    }

    public function setPortfolioTemplateId($a_val)
    {
        $this->portfolio_template = $a_val;
    }

    public function getPortfolioTemplateId()
    {
        return $this->portfolio_template;
    }


    public function read()
    {
        $ilDB = $this->db;
        
        $set = $ilDB->query(
            "SELECT * FROM exc_assignment " .
            " WHERE id = " . $ilDB->quote($this->getId(), "integer")
        );
        $rec = $ilDB->fetchAssoc($set);
        
        // #16172 - might be deleted
        if (is_array($rec)) {
            $this->initFromDB($rec);
        }
    }
    
    protected function initFromDB(array $a_set)
    {
        $this->setId($a_set["id"]);
        $this->setExerciseId($a_set["exc_id"]);
        $this->setDeadline($a_set["time_stamp"]);
        $this->setExtendedDeadline($a_set["deadline2"]);
        $this->setInstruction($a_set["instruction"]);
        $this->setTitle($a_set["title"]);
        $this->setStartTime($a_set["start_time"]);
        $this->setOrderNr($a_set["order_nr"]);
        $this->setMandatory($a_set["mandatory"]);
        $this->setType($a_set["type"]);
        $this->setPeerReview($a_set["peer"]);
        $this->setPeerReviewMin($a_set["peer_min"]);
        $this->setPeerReviewSimpleUnlock($a_set["peer_unlock"]);
        $this->setPeerReviewDeadline($a_set["peer_dl"]);
        $this->setPeerReviewValid($a_set["peer_valid"]);
        $this->setPeerReviewFileUpload($a_set["peer_file"]);
        $this->setPeerReviewPersonalized($a_set["peer_prsl"]);
        $this->setPeerReviewChars($a_set["peer_char"]);
        $this->setPeerReviewText($a_set["peer_text"]);
        $this->setPeerReviewRating($a_set["peer_rating"]);
        $this->setPeerReviewCriteriaCatalogue($a_set["peer_crit_cat"]);
        $this->setFeedbackFile($a_set["fb_file"]);
        $this->setFeedbackDate($a_set["fb_date"]);
        $this->setFeedbackCron($a_set["fb_cron"]);
        $this->setTeamTutor($a_set["team_tutor"]);
        $this->setMaxFile($a_set["max_file"]);
        $this->setPortfolioTemplateId($a_set["portfolio_template"]);
        $this->setMinCharLimit($a_set["min_char_limit"]);
        $this->setMaxCharLimit($a_set["max_char_limit"]);
    }
    
    public function save()
    {
        $ilDB = $this->db;
        
        if ($this->getOrderNr() == 0) {
            $this->setOrderNr(
                self::lookupMaxOrderNrForEx($this->getExerciseId())
                + 10
            );
        }
        
        $next_id = $ilDB->nextId("exc_assignment");
        $ilDB->insert("exc_assignment", array(
            "id" => array("integer", $next_id),
            "exc_id" => array("integer", $this->getExerciseId()),
            "time_stamp" => array("integer", $this->getDeadline()),
            "deadline2" => array("integer", $this->getExtendedDeadline()),
            "instruction" => array("clob", $this->getInstruction()),
            "title" => array("text", $this->getTitle()),
            "start_time" => array("integer", $this->getStartTime()),
            "order_nr" => array("integer", $this->getOrderNr()),
            "mandatory" => array("integer", $this->getMandatory()),
            "type" => array("integer", $this->getType()),
            "peer" => array("integer", $this->getPeerReview()),
            "peer_min" => array("integer", $this->getPeerReviewMin()),
            "peer_unlock" => array("integer", $this->getPeerReviewSimpleUnlock()),
            "peer_dl" => array("integer", $this->getPeerReviewDeadline()),
            "peer_valid" => array("integer", $this->getPeerReviewValid()),
            "peer_file" => array("integer", $this->hasPeerReviewFileUpload()),
            "peer_prsl" => array("integer", $this->hasPeerReviewPersonalized()),
            "peer_char" => array("integer", $this->getPeerReviewChars()),
            "peer_text" => array("integer", (int) $this->hasPeerReviewText()),
            "peer_rating" => array("integer", (int) $this->hasPeerReviewRating()),
            "peer_crit_cat" => array("integer", $this->getPeerReviewCriteriaCatalogue()),
            "fb_file" => array("text", $this->getFeedbackFile()),
            "fb_date" => array("integer", $this->getFeedbackDate()),
            "fb_cron" => array("integer", $this->hasFeedbackCron()),
            "team_tutor" => array("integer", $this->getTeamTutor()),
            "max_file" => array("integer", $this->getMaxFile()),
            "portfolio_template" => array("integer", $this->getPortFolioTemplateId()),
            "min_char_limit" => array("integer", $this->getMinCharLimit()),
            "max_char_limit" => array("integer", $this->getMaxCharLimit())
            ));
        $this->setId($next_id);
        $exc = new ilObjExercise($this->getExerciseId(), false);
        $exc->updateAllUsersStatus();
        self::createNewAssignmentRecords($next_id, $exc);
        
        $this->handleCalendarEntries("create");
    }
    
    public function update()
    {
        $ilDB = $this->db;
        
        $ilDB->update(
            "exc_assignment",
            array(
            "exc_id" => array("integer", $this->getExerciseId()),
            "time_stamp" => array("integer", $this->getDeadline()),
            "deadline2" => array("integer", $this->getExtendedDeadline()),
            "instruction" => array("clob", $this->getInstruction()),
            "title" => array("text", $this->getTitle()),
            "start_time" => array("integer", $this->getStartTime()),
            "order_nr" => array("integer", $this->getOrderNr()),
            "mandatory" => array("integer", $this->getMandatory()),
            "type" => array("integer", $this->getType()),
            "peer" => array("integer", $this->getPeerReview()),
            "peer_min" => array("integer", $this->getPeerReviewMin()),
            "peer_unlock" => array("integer", $this->getPeerReviewSimpleUnlock()),
            "peer_dl" => array("integer", $this->getPeerReviewDeadline()),
            "peer_valid" => array("integer", $this->getPeerReviewValid()),
            "peer_file" => array("integer", $this->hasPeerReviewFileUpload()),
            "peer_prsl" => array("integer", $this->hasPeerReviewPersonalized()),
            "peer_char" => array("integer", $this->getPeerReviewChars()),
            "peer_text" => array("integer", (int) $this->hasPeerReviewText()),
            "peer_rating" => array("integer", (int) $this->hasPeerReviewRating()),
            "peer_crit_cat" => array("integer", $this->getPeerReviewCriteriaCatalogue()),
            "fb_file" => array("text", $this->getFeedbackFile()),
            "fb_date" => array("integer", $this->getFeedbackDate()),
            "fb_cron" => array("integer", $this->hasFeedbackCron()),
            "team_tutor" => array("integer", $this->getTeamTutor()),
            "max_file" => array("integer", $this->getMaxFile()),
            "portfolio_template" => array("integer", $this->getPortFolioTemplateId()),
            "min_char_limit" => array("integer", $this->getMinCharLimit()),
            "max_char_limit" => array("integer", $this->getMaxCharLimit())
            ),
            array(
            "id" => array("integer", $this->getId()),
            )
        );
        $exc = new ilObjExercise($this->getExerciseId(), false);
        $exc->updateAllUsersStatus();
        
        $this->handleCalendarEntries("update");
    }
    
    public function delete()
    {
        $ilDB = $this->db;
        
        $this->deleteGlobalFeedbackFile();
        
        $ilDB->manipulate(
            "DELETE FROM exc_assignment WHERE " .
            " id = " . $ilDB->quote($this->getId(), "integer")
        );
        $exc = new ilObjExercise($this->getExerciseId(), false);
        $exc->updateAllUsersStatus();
        
        $this->handleCalendarEntries("delete");
    }
    
    
    public static function getAssignmentDataOfExercise($a_exc_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        // should be changed to self::getInstancesByExerciseId()
        
        $set = $ilDB->query("SELECT * FROM exc_assignment " .
            " WHERE exc_id = " . $ilDB->quote($a_exc_id, "integer") .
            " ORDER BY order_nr ASC");
        $data = array();

        $order_val = 10;
        while ($rec = $ilDB->fetchAssoc($set)) {
            $data[] = array(
                "id" => $rec["id"],
                "exc_id" => $rec["exc_id"],
                "deadline" => $rec["time_stamp"],
                "deadline2" => $rec["deadline2"],
                "instruction" => $rec["instruction"],
                "title" => $rec["title"],
                "start_time" => $rec["start_time"],
                "order_val" => $order_val,
                "mandatory" => $rec["mandatory"],
                "type" => $rec["type"],
                "peer" => $rec["peer"],
                "peer_min" => $rec["peer_min"],
                "peer_dl" => $rec["peer_dl"],
                "peer_file" => $rec["peer_file"],
                "peer_prsl" => $rec["peer_prsl"],
                "fb_file" => $rec["fb_file"],
                "fb_date" => $rec["fb_date"],
                "fb_cron" => $rec["fb_cron"],
                );
            $order_val += 10;
        }
        return $data;
    }
    
    public static function cloneAssignmentsOfExercise($a_old_exc_id, $a_new_exc_id, array $a_crit_cat_map)
    {
        $ass_data = self::getInstancesByExercise($a_old_exc_id);
        foreach ($ass_data as $d) {
            // clone assignment
            $new_ass = new ilExAssignment();
            $new_ass->setExerciseId($a_new_exc_id);
            $new_ass->setTitle($d->getTitle());
            $new_ass->setDeadline($d->getDeadline());
            $new_ass->setExtendedDeadline($d->getExtendedDeadline());
            $new_ass->setInstruction($d->getInstruction());
            $new_ass->setMandatory($d->getMandatory());
            $new_ass->setOrderNr($d->getOrderNr());
            $new_ass->setStartTime($d->getStartTime());
            $new_ass->setType($d->getType());
            $new_ass->setPeerReview($d->getPeerReview());
            $new_ass->setPeerReviewMin($d->getPeerReviewMin());
            $new_ass->setPeerReviewDeadline($d->getPeerReviewDeadline());
            $new_ass->setPeerReviewFileUpload($d->hasPeerReviewFileUpload());
            $new_ass->setPeerReviewPersonalized($d->hasPeerReviewPersonalized());
            $new_ass->setPeerReviewValid($d->getPeerReviewValid());
            $new_ass->setPeerReviewChars($d->getPeerReviewChars());
            $new_ass->setPeerReviewText($d->hasPeerReviewText());
            $new_ass->setPeerReviewRating($d->hasPeerReviewRating());
            $new_ass->setPeerReviewCriteriaCatalogue($d->getPeerReviewCriteriaCatalogue());
            $new_ass->setPeerReviewSimpleUnlock($d->getPeerReviewSimpleUnlock());
            $new_ass->setFeedbackFile($d->getFeedbackFile());
            $new_ass->setFeedbackDate($d->getFeedbackDate());
            $new_ass->setFeedbackCron($d->hasFeedbackCron()); // #16295
            $new_ass->setTeamTutor($d->getTeamTutor());
            $new_ass->setMaxFile($d->getMaxFile());
            $new_ass->setMinCharLimit($d->getMinCharLimit());
            $new_ass->setMaxCharLimit($d->getMaxCharLimit());
            $new_ass->setPortfolioTemplateId($d->getPortfolioTemplateId());


            // criteria catalogue(s)
            if ($d->getPeerReviewCriteriaCatalogue() &&
                array_key_exists($d->getPeerReviewCriteriaCatalogue(), $a_crit_cat_map)) {
                $new_ass->setPeerReviewCriteriaCatalogue($a_crit_cat_map[$d->getPeerReviewCriteriaCatalogue()]);
            }
            
            $new_ass->save();
            

            // clone assignment files
            include_once("./Modules/Exercise/classes/class.ilFSWebStorageExercise.php");
            $old_web_storage = new ilFSWebStorageExercise($a_old_exc_id, (int) $d->getId());
            $new_web_storage = new ilFSWebStorageExercise($a_new_exc_id, (int) $new_ass->getId());
            $new_web_storage->create();
            if (is_dir($old_web_storage->getPath())) {
                ilUtil::rCopy($old_web_storage->getPath(), $new_web_storage->getPath());
            }
            
            // clone global feedback file
            include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
            $old_storage = new ilFSStorageExercise($a_old_exc_id, (int) $d->getId());
            $new_storage = new ilFSStorageExercise($a_new_exc_id, (int) $new_ass->getId());
            $new_storage->create();
            if (is_dir($old_storage->getGlobalFeedbackPath())) {
                ilUtil::rCopy($old_storage->getGlobalFeedbackPath(), $new_storage->getGlobalFeedbackPath());
            }
        }
    }
    
    public function getFiles()
    {
        $this->log->debug("getting files from class.ilExAssignment using ilFSWebStorageExercise");
        include_once("./Modules/Exercise/classes/class.ilFSWebStorageExercise.php");
        $storage = new ilFSWebStorageExercise($this->getExerciseId(), $this->getId());
        return $storage->getFiles();
    }

    public function getInstructionFilesOrder()
    {
        $ilDB = $this->db;

        $set = $ilDB->query(
            "SELECT filename, order_nr, id FROM exc_ass_file_order " .
            " WHERE assignment_id  = " . $ilDB->quote($this->getId(), "integer")
        );

        $data = array();
        while ($rec  = $ilDB->fetchAssoc($set)) {
            $data[$rec['filename']] = $rec;
        }

        return $data;
    }
    
    public static function lookupMaxOrderNrForEx($a_exc_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $set = $ilDB->query(
            "SELECT MAX(order_nr) mnr FROM exc_assignment " .
            " WHERE exc_id = " . $ilDB->quote($a_exc_id, "integer")
        );
        while ($rec = $ilDB->fetchAssoc($set)) {
            return (int) $rec["mnr"];
        }
        return 0;
    }
    
    public static function lookupAssignmentOnline($a_ass_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $query = "SELECT id FROM exc_assignment " .
            "WHERE start_time <= " . $ilDB->quote(time(), 'integer') . ' ' .
            "AND time_stamp >= " . $ilDB->quote(time(), 'integer') . ' ' .
            "AND id = " . $ilDB->quote($a_ass_id, 'integer');
        $res = $ilDB->query($query);
        
        return $res->numRows() ? true : false;
    }

    public static function lookupExerciseId($a_ass_id)
    {
        global $DIC;

        $ilDB = $DIC->database();

        $query = "SELECT exc_id FROM exc_assignment " .
            "WHERE id = " . $ilDB->quote($a_ass_id, 'integer');
        $res = $ilDB->fetchAssoc($ilDB->query($query));

        return (int) $res["exc_id"];
    }

    private static function lookup($a_id, $a_field)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $set = $ilDB->query(
            "SELECT " . $a_field . " FROM exc_assignment " .
            " WHERE id = " . $ilDB->quote($a_id, "integer")
        );

        $rec = $ilDB->fetchAssoc($set);

        return $rec[$a_field];
    }
    
    public static function lookupTitle($a_id)
    {
        return self::lookup($a_id, "title");
    }
    
    public static function lookupType($a_id)
    {
        return self::lookup($a_id, "type");
    }
    
    public static function saveAssOrderOfExercise($a_ex_id, $a_order)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $result_order = array();
        asort($a_order);
        $nr = 10;
        foreach ($a_order as $k => $v) {
            // the check for exc_id is for security reasons. ass ids are unique.
            $ilDB->manipulate(
                $t = "UPDATE exc_assignment SET " .
                " order_nr = " . $ilDB->quote($nr, "integer") .
                " WHERE id = " . $ilDB->quote((int) $k, "integer") .
                " AND exc_id = " . $ilDB->quote((int) $a_ex_id, "integer")
            );
            $nr+=10;
        }
    }

    public static function orderAssByDeadline($a_ex_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $set = $ilDB->query(
            "SELECT id FROM exc_assignment " .
            " WHERE exc_id = " . $ilDB->quote($a_ex_id, "integer") .
            " ORDER BY time_stamp ASC"
        );
        $nr = 10;
        while ($rec  = $ilDB->fetchAssoc($set)) {
            $ilDB->manipulate(
                "UPDATE exc_assignment SET " .
                " order_nr = " . $ilDB->quote($nr, "integer") .
                " WHERE id = " . $ilDB->quote($rec["id"], "integer")
            );
            $nr += 10;
        }
    }

    public static function countMandatory($a_ex_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $set = $ilDB->query(
            "SELECT count(*) cntm FROM exc_assignment " .
            " WHERE exc_id = " . $ilDB->quote($a_ex_id, "integer") .
            " AND mandatory = " . $ilDB->quote(1, "integer")
        );
        $rec = $ilDB->fetchAssoc($set);
        return $rec["cntm"];
    }


    public static function lookupUpdatedSubmission($ass_id, $member_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        $lng = $DIC->language();
        
        // team upload?
        $user_ids = self::getTeamMembersByAssignmentId($ass_id, $member_id);
        if (!$user_ids) {
            $user_ids = array($member_id);
        }

        $q="SELECT exc_mem_ass_status.status_time, exc_returned.ts " .
            "FROM exc_mem_ass_status, exc_returned " .
            "WHERE exc_mem_ass_status.status_time < exc_returned.ts " .
            "AND NOT exc_mem_ass_status.status_time IS NULL " .
            "AND exc_returned.ass_id = exc_mem_ass_status.ass_id " .
            "AND exc_returned.user_id = exc_mem_ass_status.usr_id " .
            "AND exc_returned.ass_id=" . $ilDB->quote($ass_id, "integer") .
            " AND " . $ilDB->in("exc_returned.user_id", $user_ids, "", "integer");

        $usr_set = $ilDB->query($q);

        $array = $ilDB->fetchAssoc($usr_set);

        if (count($array)==0) {
            return 0;
        } else {
            return 1;
        }
    }

    public function getMemberListData()
    {
        $ilDB = $this->db;

        $mem = array();
        
        // first get list of members from member table
        $set = $ilDB->query("SELECT ud.usr_id, ud.lastname, ud.firstname, ud.login" .
            " FROM exc_members excm" .
            " JOIN usr_data ud ON (ud.usr_id = excm.usr_id)" .
            " WHERE excm.obj_id = " . $ilDB->quote($this->getExerciseId(), "integer"));
        while ($rec = $ilDB->fetchAssoc($set)) {
            $mem[$rec["usr_id"]] =
                array(
                "name" => $rec["lastname"] . ", " . $rec["firstname"],
                "login" => $rec["login"],
                "usr_id" => $rec["usr_id"],
                "lastname" => $rec["lastname"],
                "firstname" => $rec["firstname"]
                );
        }
        
        include_once "Modules/Exercise/classes/class.ilExSubmission.php";

        $q = "SELECT * FROM exc_mem_ass_status " .
            "WHERE ass_id = " . $ilDB->quote($this->getId(), "integer");
        $set = $ilDB->query($q);
        while ($rec = $ilDB->fetchAssoc($set)) {
            if (isset($mem[$rec["usr_id"]])) {
                $sub = new ilExSubmission($this, $rec["usr_id"]);
                
                $mem[$rec["usr_id"]]["sent_time"] = $rec["sent_time"];
                $mem[$rec["usr_id"]]["submission"] = $sub->getLastSubmission();
                $mem[$rec["usr_id"]]["status_time"] = $rec["status_time"];
                $mem[$rec["usr_id"]]["feedback_time"] = $rec["feedback_time"];
                $mem[$rec["usr_id"]]["notice"] = $rec["notice"];
                $mem[$rec["usr_id"]]["status"] = $rec["status"];
                $mem[$rec["usr_id"]]["mark"] = $rec["mark"];
                $mem[$rec["usr_id"]]["comment"] = $rec["u_comment"];
            }
        }
        return $mem;
    }
    
    public static function createNewUserRecords($a_user_id, $a_exc_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $ass_data = self::getAssignmentDataOfExercise($a_exc_id);
        foreach ($ass_data as $ass) {
            //echo "-".$ass["id"]."-".$a_user_id."-";
            $ilDB->replace("exc_mem_ass_status", array(
                "ass_id" => array("integer", $ass["id"]),
                "usr_id" => array("integer", $a_user_id)
                ), array(
                "status" => array("text", "notgraded")
                ));
        }
    }
    
    public static function createNewAssignmentRecords($a_ass_id, $a_exc)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        include_once("./Modules/Exercise/classes/class.ilExerciseMembers.php");
        $exmem = new ilExerciseMembers($a_exc);
        $mems = $exmem->getMembers();

        foreach ($mems as $mem) {
            $ilDB->replace("exc_mem_ass_status", array(
                "ass_id" => array("integer", $a_ass_id),
                "usr_id" => array("integer", $mem)
                ), array(
                "status" => array("text", "notgraded")
                ));
        }
    }

    public function uploadAssignmentFiles($a_files)
    {
        ilLoggerFactory::getLogger("exc")->debug("upload assignment files files = ", $a_files);
        include_once("./Modules/Exercise/classes/class.ilFSWebStorageExercise.php");
        $storage = new ilFSWebStorageExercise($this->getExerciseId(), $this->getId());
        $storage->create();
        $storage->uploadAssignmentFiles($a_files);
    }
    
    

    public function sendMultiFeedbackStructureFile(ilObjExercise $exercise)
    {
        global $DIC;
        
        
        // send and delete the zip file
        $deliverFilename = trim(str_replace(" ", "_", $this->getTitle() . "_" . $this->getId()));
        $deliverFilename = ilUtil::getASCIIFilename($deliverFilename);
        $deliverFilename = "multi_feedback_" . $deliverFilename;

        $exc = new ilObjExercise($this->getExerciseId(), false);
        
        $cdir = getcwd();
        
        // create temporary directoy
        $tmpdir = ilUtil::ilTempnam();
        ilUtil::makeDir($tmpdir);
        $mfdir = $tmpdir . "/" . $deliverFilename;
        ilUtil::makeDir($mfdir);
        
        // create subfolders <lastname>_<firstname>_<id> for each participant
        include_once("./Modules/Exercise/classes/class.ilExerciseMembers.php");
        $exmem = new ilExerciseMembers($exc);
        $mems = $exmem->getMembers();
        
        $mems = $DIC->access()->filterUserIdsByRbacOrPositionOfCurrentUser(
            'edit_submissions_grades',
            'edit_submissions_grades',
            $exercise->getRefId(),
            $mems
        );
        foreach ($mems as $mem) {
            $name = ilObjUser::_lookupName($mem);
            $subdir = $name["lastname"] . "_" . $name["firstname"] . "_" . $name["login"] . "_" . $name["user_id"];
            $subdir = ilUtil::getASCIIFilename($subdir);
            ilUtil::makeDir($mfdir . "/" . $subdir);
        }
        
        // create the zip file
        chdir($tmpdir);
        $tmpzipfile = $tmpdir . "/multi_feedback.zip";
        ilUtil::zip($tmpdir, $tmpzipfile, true);
        chdir($cdir);
        

        ilUtil::deliverFile($tmpzipfile, $deliverFilename . ".zip", "", false, true);
    }
    
    public function uploadMultiFeedbackFile($a_file)
    {
        $lng = $this->lng;
        $ilUser = $this->user;
        
        include_once("./Modules/Exercise/exceptions/class.ilExerciseException.php");
        if (!is_file($a_file["tmp_name"])) {
            throw new ilExerciseException($lng->txt("exc_feedback_file_could_not_be_uploaded"));
        }
        
        include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
        $storage = new ilFSStorageExercise($this->getExerciseId(), $this->getId());
        $mfu = $storage->getMultiFeedbackUploadPath($ilUser->getId());
        ilUtil::delDir($mfu, true);
        ilUtil::moveUploadedFile($a_file["tmp_name"], "multi_feedback.zip", $mfu . "/" . "multi_feedback.zip");
        ilUtil::unzip($mfu . "/multi_feedback.zip", true);
        $subdirs = ilUtil::getDir($mfu);
        $subdir = "notfound";
        foreach ($subdirs as $s => $j) {
            if ($j["type"] == "dir" && substr($s, 0, 14) == "multi_feedback") {
                $subdir = $s;
            }
        }

        if (!is_dir($mfu . "/" . $subdir)) {
            throw new ilExerciseException($lng->txt("exc_no_feedback_dir_found_in_zip"));
        }

        return true;
    }
    
    public function getMultiFeedbackFiles($a_user_id = 0)
    {
        $ilUser = $this->user;
        
        if ($a_user_id == 0) {
            $a_user_id = $ilUser->getId();
        }
        
        $mf_files = array();
        
        // get members
        $exc = new ilObjExercise($this->getExerciseId(), false);
        include_once("./Modules/Exercise/classes/class.ilExerciseMembers.php");
        $exmem = new ilExerciseMembers($exc);
        $mems = $exmem->getMembers();

        // read mf directory
        include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
        $storage = new ilFSStorageExercise($this->getExerciseId(), $this->getId());
        $mfu = $storage->getMultiFeedbackUploadPath($ilUser->getId());

        // get subdir that starts with multi_feedback
        $subdirs = ilUtil::getDir($mfu);
        $subdir = "notfound";
        foreach ($subdirs as $s => $j) {
            if ($j["type"] == "dir" && substr($s, 0, 14) == "multi_feedback") {
                $subdir = $s;
            }
        }
        
        $items = ilUtil::getDir($mfu . "/" . $subdir);
        foreach ($items as $k => $i) {
            // check directory
            if ($i["type"] == "dir" && !in_array($k, array(".", ".."))) {
                // check if valid member id is given
                $parts = explode("_", $i["entry"]);
                $user_id = (int) $parts[count($parts) - 1];
                if (in_array($user_id, $mems)) {
                    // read dir of user
                    $name = ilObjUser::_lookupName($user_id);
                    $files = ilUtil::getDir($mfu . "/" . $subdir . "/" . $k);
                    foreach ($files as $k2 => $f) {
                        // append files to array
                        if ($f["type"] == "file" && substr($k2, 0, 1) != ".") {
                            $mf_files[] = array(
                                "lastname" => $name["lastname"],
                                "firstname" => $name["firstname"],
                                "login" => $name["login"],
                                "user_id" => $name["user_id"],
                                "full_path" => $mfu . "/" . $subdir . "/" . $k . "/" . $k2,
                                "file" => $k2);
                        }
                    }
                }
            }
        }
        return $mf_files;
    }
    
    public function clearMultiFeedbackDirectory()
    {
        $lng = $this->lng;
        $ilUser = $this->user;
        
        include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
        $storage = new ilFSStorageExercise($this->getExerciseId(), $this->getId());
        $mfu = $storage->getMultiFeedbackUploadPath($ilUser->getId());
        ilUtil::delDir($mfu);
    }
    
    public function saveMultiFeedbackFiles($a_files, ilObjExercise $a_exc)
    {
        if ($this->getExerciseId() != $a_exc->getId()) {
            return;
        }
        
        include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
        $fstorage = new ilFSStorageExercise($this->getExerciseId(), $this->getId());
        $fstorage->create();
        
        $team_map = array();
        
        $mf_files = $this->getMultiFeedbackFiles();
        foreach ($mf_files as $f) {
            $user_id = $f["user_id"];
            $file_path = $f["full_path"];
            $file_name = $f["file"];
            
            // if checked in confirmation gui
            if ($a_files[$user_id][md5($file_name)] != "") {
                $submission = new ilExSubmission($this, $user_id);
                $feedback_id = $submission->getFeedbackId();
                $noti_rec_ids = $submission->getUserIds();
                
                if ($feedback_id) {
                    $fb_path = $fstorage->getFeedbackPath($feedback_id);
                    $target = $fb_path . "/" . $file_name;
                    if (is_file($target)) {
                        unlink($target);
                    }
                    // rename file
                    rename($file_path, $target);
                                        
                    if ($noti_rec_ids) {
                        foreach ($noti_rec_ids as $user_id) {
                            $member_status = $this->getMemberStatus($user_id);
                            $member_status->setFeedback(true);
                            $member_status->update();
                        }
                        
                        $a_exc->sendFeedbackFileNotification(
                            $file_name,
                            $noti_rec_ids,
                            (int) $this->getId()
                        );
                    }
                }
            }
        }
        
        $this->clearMultiFeedbackDirectory();
    }
    
    
    
    
    protected function handleCalendarEntries($a_event)
    {
        $ilAppEventHandler = $this->app_event_handler;
        
        $dl_id = $this->getId() . "0";
        $fbdl_id = $this->getId() . "1";
        
        $context_ids = array($dl_id, $fbdl_id);
        $apps = array();
        
        if ($a_event != "delete") {
            include_once "Services/Calendar/classes/class.ilCalendarAppointmentTemplate.php";
            
            if ($this->getDeadline()) {
                $app = new ilCalendarAppointmentTemplate($dl_id);
                $app->setTranslationType(IL_CAL_TRANSLATION_SYSTEM);
                $app->setSubtitle("cal_exc_deadline");
                $app->setTitle($this->getTitle());
                $app->setFullday(false);
                $app->setStart(new ilDateTime($this->getDeadline(), IL_CAL_UNIX));
                
                $apps[] = $app;
            }

            if ($this->getPeerReview() &&
                $this->getPeerReviewDeadline()) {
                $app = new ilCalendarAppointmentTemplate($fbdl_id);
                $app->setTranslationType(IL_CAL_TRANSLATION_SYSTEM);
                $app->setSubtitle("cal_exc_peer_review_deadline");
                $app->setTitle($this->getTitle());
                $app->setFullday(false);
                $app->setStart(new ilDateTime($this->getPeerReviewDeadline(), IL_CAL_UNIX));
                
                $apps[] = $app;
            }
        }
                
        include_once "Modules/Exercise/classes/class.ilObjExercise.php";
        $exc = new ilObjExercise($this->getExerciseId(), false);
        
        $ilAppEventHandler->raise(
            'Modules/Exercise',
            $a_event . 'Assignment',
            array(
            'object' => $exc,
            'obj_id' => $exc->getId(),
            'context_ids' => $context_ids,
            'appointments' => $apps)
        );
    }
    
    
    public static function getPendingFeedbackNotifications()
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $res = array();
        
        $set = $ilDB->query("SELECT id,fb_file,time_stamp,deadline2 FROM exc_assignment" .
            " WHERE fb_cron = " . $ilDB->quote(1, "integer") .
            " AND fb_date = " . $ilDB->quote(self::FEEDBACK_DATE_DEADLINE, "integer") .
            " AND time_stamp IS NOT NULL" .
            " AND time_stamp > " . $ilDB->quote(0, "integer") .
            " AND time_stamp < " . $ilDB->quote(time(), "integer") .
            " AND fb_cron_done = " . $ilDB->quote(0, "integer"));
        while ($row = $ilDB->fetchAssoc($set)) {
            $max = max($row['time_stamp'], $row['deadline2']);

            if (trim($row["fb_file"]) && $max <= time()) {
                $res[] = $row["id"];
            }
        }
    
        return $res;
    }
    
    public static function sendFeedbackNotifications($a_ass_id, $a_user_id = null)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $ass = new self($a_ass_id);
        
        // valid assignment?
        if (!$ass->hasFeedbackCron() || !$ass->getFeedbackFile()) {
            return false;
        }
        
        if (!$a_user_id) {
            // already done?
            $set = $ilDB->query("SELECT fb_cron_done" .
                " FROM exc_assignment" .
                " WHERE id = " . $ilDB->quote($a_ass_id, "integer"));
            $row = $ilDB->fetchAssoc($set);
            if ($row["fb_cron_done"]) {
                return false;
            }
        }
        
        include_once "./Services/Notification/classes/class.ilSystemNotification.php";
        $ntf = new ilSystemNotification();
        $ntf->setLangModules(array("exc"));
        $ntf->setObjId($ass->getExerciseId());
        $ntf->setSubjectLangId("exc_feedback_notification_subject");
        $ntf->setIntroductionLangId("exc_feedback_notification_body");
        $ntf->addAdditionalInfo("exc_assignment", $ass->getTitle());
        $ntf->setGotoLangId("exc_feedback_notification_link");
        $ntf->setReasonLangId("exc_feedback_notification_reason");
        
        if (!$a_user_id) {
            include_once "./Modules/Exercise/classes/class.ilExerciseMembers.php";
            $ntf->sendMail(ilExerciseMembers::_getMembers($ass->getExerciseId()));
                        
            $ilDB->manipulate("UPDATE exc_assignment" .
                " SET fb_cron_done = " . $ilDB->quote(1, "integer") .
                " WHERE id = " . $ilDB->quote($a_ass_id, "integer"));
        } else {
            $ntf->sendMail(array($a_user_id));
        }
        
        return true;
    }
    
    
    // status
    
    public function afterDeadline()
    {
        $ilUser = $this->user;
                
        // :TODO: always current user?
        $idl = $this->getPersonalDeadline($ilUser->getId());
        
        // no deadline === true
        $deadline = max($this->deadline, $this->deadline2, $idl);
        return ($deadline - time() <= 0);
    }
    
    public function afterDeadlineStrict($a_include_personal = true)
    {
        // :TODO: this means that peer feedback, global feedback is available
        // after LAST personal deadline
        // team management is currently ignoring personal deadlines
        $idl = (bool) $a_include_personal
            ? $this->getLastPersonalDeadline()
            : null;
        
        // no deadline === false
        $deadline = max($this->deadline, $this->deadline2, $idl);
        
        // #18271 - afterDeadline() does not handle last personal deadline
        if ($idl && $deadline == $idl) {
            return ($deadline - time() <= 0);
        }
        
        return ($deadline > 0 &&
            $this->afterDeadline());
    }
    
    public function beforeDeadline()
    {
        // no deadline === true
        return !$this->afterDeadlineStrict();
    }
    
    public function notStartedYet()
    {
        return (time() - $this->start_time <= 0);
    }
    
    
    //
    // FEEDBACK FILES
    //
    
    public function getGlobalFeedbackFileStoragePath()
    {
        include_once("./Modules/Exercise/classes/class.ilFSStorageExercise.php");
        $storage = new ilFSStorageExercise($this->getExerciseId(), $this->getId());
        return $storage->getGlobalFeedbackPath();
    }
    
    public function deleteGlobalFeedbackFile()
    {
        ilUtil::delDir($this->getGlobalFeedbackFileStoragePath());
    }
    
    public function handleGlobalFeedbackFileUpload(array $a_file)
    {
        $path = $this->getGlobalFeedbackFileStoragePath();
        ilUtil::delDir($path, true);
        if (ilUtil::moveUploadedFile($a_file["tmp_name"], $a_file["name"], $path . "/" . $a_file["name"])) {
            $this->setFeedbackFile($a_file["name"]);
            return true;
        }
        return false;
    }
    
    public function getGlobalFeedbackFilePath()
    {
        $file = $this->getFeedbackFile();
        if ($file) {
            $path = $this->getGlobalFeedbackFileStoragePath();
            return $path . "/" . $file;
        }
    }

    public function getMemberStatus($a_user_id = null)
    {
        $ilUser = $this->user;
        
        if (!$a_user_id) {
            $a_user_id = $ilUser->getId();
        }
        if (!array_key_exists($a_user_id, $this->member_status)) {
            include_once "Modules/Exercise/classes/class.ilExAssignmentMemberStatus.php";
            $this->member_status[$a_user_id] = new ilExAssignmentMemberStatus($this->getId(), $a_user_id);
        }
        return $this->member_status[$a_user_id];
    }
    
    public function recalculateLateSubmissions()
    {
        $ilDB = $this->db;
        
        // see JF, 2015-05-11
                
        $ext_deadline = $this->getExtendedDeadline();
        
        include_once "Modules/Exercise/classes/class.ilExSubmission.php";
        foreach (ilExSubmission::getAllAssignmentFiles($this->exc_id, $this->getId()) as $file) {
            $id = $file["returned_id"];
            $uploaded = new ilDateTime($file["ts"], IL_CAL_DATETIME);
            $uploaded = $uploaded->get(IL_CAL_UNIX);
            
            $deadline = $this->getPersonalDeadline($file["user_id"]);
            $last_deadline = max($deadline, $this->getExtendedDeadline());
            
            $late = null;
            
            // upload is not late anymore
            if ($file["late"] &&
                (!$last_deadline ||
                !$ext_deadline ||
                $uploaded < $deadline)) {
                $late = false;
            }
            // upload is now late
            elseif (!$file["late"] &&
                $ext_deadline &&
                $deadline &&
                $uploaded > $deadline) {
                $late = true;
            } elseif ($last_deadline && $uploaded > $last_deadline) {
                // do nothing, we do not remove submissions?
            }
            
            if ($late !== null) {
                $ilDB->manipulate("UPDATE exc_returned" .
                    " SET late = " . $ilDB->quote($late, "integer") .
                    " WHERE returned_id = " . $ilDB->quote($id, "integer"));
            }
        }
    }
    
    
    //
    // individual deadlines
    //
    
    public function setIndividualDeadline($id, ilDateTime $date)
    {
        $ilDB = $this->db;
        
        $is_team = false;
        if (!is_numeric($id)) {
            $id = substr($id, 1);
            $is_team = true;
        }
        
        $ilDB->replace(
            "exc_idl",
            array(
                "ass_id" => array("integer", $this->getId()),
                "member_id" => array("integer", $id),
                "is_team" => array("integer", $is_team)
            ),
            array(
                "tstamp" => array("integer", $date->get(IL_CAL_UNIX))
            )
        );
    }
    
    public function getIndividualDeadlines()
    {
        $ilDB = $this->db;
        
        $res = array();
        
        $set = $ilDB->query("SELECT * FROM exc_idl" .
            " WHERE ass_id = " . $ilDB->quote($this->getId(), "integer"));
        while ($row = $ilDB->fetchAssoc($set)) {
            if ($row["is_team"]) {
                $row["member_id"] = "t" . $row["member_id"];
            }
            
            $res[$row["member_id"]] = $row["tstamp"];
        }
        
        return $res;
    }
    
    public function hasActiveIDl()
    {
        return (bool) $this->getDeadline();
    }
    
    public function hasReadOnlyIDl()
    {
        if ($this->getType() != ilExAssignment::TYPE_UPLOAD_TEAM &&
            $this->getPeerReview()) {
            // all deadlines are read-only if we have peer feedback
            include_once "Modules/Exercise/classes/class.ilExPeerReview.php";
            $peer_review = new ilExPeerReview($this);
            if ($peer_review->hasPeerReviewGroups()) {
                return true;
            }
        }
        
        return false;
    }

    public static function saveInstructionFilesOrderOfAssignment($a_ass_id, $a_order)
    {
        global $DIC;

        $db = $DIC->database();

        asort($a_order, SORT_NUMERIC);

        $nr = 10;
        foreach ($a_order as $k => $v) {
            // the check for exc_id is for security reasons. ass ids are unique.
            $db->manipulate(
                $t = "UPDATE exc_ass_file_order SET " .
                " order_nr = " . $db->quote($nr, "integer") .
                " WHERE id = " . $db->quote((int) $k, "integer") .
                " AND assignment_id = " . $db->quote((int) $a_ass_id, "integer")
            );
            $nr+=10;
        }
    }

    public static function instructionFileInsertOrder($a_filename, $a_ass_id, $a_order_nr = 0)
    {
        global $DIC;

        $db = $DIC->database();

        $order = 0;
        $order_val = 0;

        if ($a_ass_id) {
            //first of all check the suffix and change if necessary
            $filename = ilUtil::getSafeFilename($a_filename);

            if (!self::instructionFileExistsInDb($filename, $a_ass_id)) {
                if ($a_order_nr == 0) {
                    $order_val = self::instructionFileOrderGetMax($a_ass_id);
                    $order = $order_val + 10;
                } else {
                    $order = $a_order_nr;
                }

                $id = $db->nextID('exc_ass_file_order');
                $db->manipulate("INSERT INTO exc_ass_file_order " .
                    "(id, assignment_id, filename, order_nr) VALUES (" .
                    $db->quote($id, "integer") . "," .
                    $db->quote($a_ass_id, "integer") . "," .
                    $db->quote($filename, "text") . "," .
                    $db->quote($order, "integer") .
                    ")");
            }
        }
    }

    public static function instructionFileDeleteOrder($a_ass_id, $a_file)
    {
        global $DIC;

        $db = $DIC->database();

        //now its done by filename. We need to figure how to get the order id in the confirmdelete method
        foreach ($a_file as $k => $v) {
            $db->manipulate(
                "DELETE FROM exc_ass_file_order " .
                //"WHERE id = " . $ilDB->quote((int)$k, "integer") .
                "WHERE filename = " . $db->quote($v, "string") .
                " AND assignment_id = " . $db->quote($a_ass_id, 'integer')
            );
        }
    }

    public static function renameInstructionFile($a_old_name, $a_new_name, $a_ass_id)
    {
        global $DIC;

        $db = $DIC->database();

        if ($a_ass_id) {
            $db->manipulate(
                "DELETE FROM exc_ass_file_order" .
                " WHERE assignment_id = " . $db->quote((int) $a_ass_id, 'integer') .
                " AND filename = " . $db->quote($a_new_name, 'string')
            );

            $db->manipulate(
                "UPDATE exc_ass_file_order SET" .
                " filename = " . $db->quote($a_new_name, 'string') .
                " WHERE assignment_id = " . $db->quote((int) $a_ass_id, 'integer') .
                " AND filename = " . $db->quote($a_old_name, 'string')
            );
        }
    }

    public static function instructionFileExistsInDb($a_filename, $a_ass_id)
    {
        global $DIC;

        $db = $DIC->database();

        if ($a_ass_id) {
            $result = $db->query(
                "SELECT id FROM exc_ass_file_order" .
                " WHERE assignment_id = " . $db->quote((int) $a_ass_id, 'integer') .
                " AND filename = " . $db->quote($a_filename, 'string')
            );

            return $db->numRows($result);
        }
    }

    public function fixInstructionFileOrdering()
    {
        global $DIC;

        $db = $DIC->database();

        $files = array_map(function ($v) {
            return $v["name"];
        }, $this->getFiles());

        $set = $db->query("SELECT * FROM exc_ass_file_order " .
            " WHERE assignment_id = " . $db->quote($this->getId(), "integer") .
            " ORDER BY order_nr");
        $order_nr = 10;
        $numbered_files = array();
        while ($rec = $db->fetchAssoc($set)) {
            // file exists, set correct order nr
            if (in_array($rec["filename"], $files)) {
                $db->manipulate(
                    "UPDATE exc_ass_file_order SET " .
                    " order_nr = " . $db->quote($order_nr, "integer") .
                    " WHERE assignment_id = " . $db->quote($this->getId(), "integer") .
                    " AND id = " . $db->quote($rec["id"], "integer")
                );
                $order_nr+=10;
                $numbered_files[] = $rec["filename"];
            } else {    // file does not exist, delete entry
                $db->manipulate(
                    "DELETE FROM exc_ass_file_order " .
                    " WHERE assignment_id = " . $db->quote($this->getId(), "integer") .
                    " AND id = " . $db->quote($rec["id"], "integer")
                );
            }
        }
        foreach ($files as $f) {
            if (!in_array($f, $numbered_files)) {
                self::instructionFileInsertOrder($f, $this->getId());
            }
        }
    }

    public function fileAddOrder($a_entries = array())
    {
        $this->fixInstructionFileOrdering();

        $order = $this->getInstructionFilesOrder();
        foreach ($a_entries as $k => $e) {
            $a_entries[$k]["order_val"] = $order[$e["file"]]["order_nr"];
            $a_entries[$k]["order_id"] = $order[$e["file"]]["id"];
        }

        return $a_entries;
    }

    public static function instructionFileOrderGetMax($a_ass_id)
    {
        global $DIC;

        $db = $DIC->database();

        //get max order number
        $result = $db->queryF(
            "SELECT max(order_nr) as max_order FROM exc_ass_file_order WHERE assignment_id = %s",
            array('integer'),
            array($db->quote($a_ass_id, 'integer'))
        );

        while ($row = $db->fetchAssoc($result)) {
            $order_val = (int) $row['max_order'];
        }
        return $order_val;
    }


    public function setMinCharLimit($a_val)
    {
        $this->min_char_limit = $a_val;
    }

    public function getMinCharLimit()
    {
        return $this->min_char_limit;
    }

    public function setMaxCharLimit($a_val)
    {
        $this->max_char_limit = $a_val;
    }

    public function getMaxCharLimit()
    {
        return $this->max_char_limit;
    }
}