class.ilLPTableBaseGUI.php

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

include_once("./Services/Table/classes/class.ilTable2GUI.php");
include_once  './Services/Search/classes/class.ilSearchSettings.php';
require_once('./Services/Repository/classes/class.ilObjectPlugin.php');

class ilLPTableBaseGUI extends ilTable2GUI
{
        protected $filter; // array
        protected $anonymized; // [bool]

        public function __construct($a_parent_obj, $a_parent_cmd = "", $a_template_context = "")
        {
                parent::__construct($a_parent_obj, $a_parent_cmd, $a_template_context);

                // country names
                $this->lng->loadLanguageModule("meta");
                
                include_once("./Services/Object/classes/class.ilObjectLP.php");
                
                $this->anonymized = (bool)!ilObjUserTracking::_enabledUserRelatedData();
                if(!$this->anonymized && $this->obj_id)
                {
                        include_once "Services/Object/classes/class.ilObjectLP.php";
                        $olp = ilObjectLP::getInstance($this->obj_id);
                        $this->anonymized = $olp->isAnonymized();
                }
        }

        public function executeCommand()
        {
                global $ilCtrl, $lng;

                $this->determineSelectedFilters();

                if(!$ilCtrl->getNextClass($this))
                {
                        $to_hide = false;

                        switch($ilCtrl->getCmd())
                        {
                                case "applyFilter":
                                        $this->resetOffset();
                                        $this->writeFilterToSession();
                                        break;

                                case "resetFilter":
                                        $this->resetOffset();
                                        $this->resetFilter();
                                        break;

                                case "hideSelected":
                                        $to_hide = $_POST["item_id"];
                                        break;

                                case "hide":
                                        $to_hide = array((int)$_GET["hide"]);
                                        break;
                                
                                case "mailselectedusers":
                                        if(!sizeof($_POST["uid"]))
                                        {
                                                ilUtil::sendFailure($lng->txt("no_checkbox"), true);
                                        }
                                        else
                                        {
                                                $this->sendMail($_POST["uid"], $this->parent_obj, $this->parent_cmd);                                                                                           
                                        }
                                        break;
                                        
                                case 'addToClipboard':
                                        if(!sizeof($_POST['uid']))
                                        {
                                                ilUtil::sendFailure($lng->txt('no_checkbox'), true);
                                        }
                                        else
                                        {
                                                $this->addToClipboard();
                                        }
                                        break;
                                
                                // page selector
                                default:
                                        $this->determineOffsetAndOrder();
                                        $this->storeNavParameter();
                                        break;
                        }

                        if($to_hide)
                        {
                                $obj = $this->getFilterItemByPostVar("hide");
                                $value = array_unique(array_merge((array)$obj->getValue(), $to_hide));
                                $obj->setValue($value);
                                $obj->writeToSession();
                        }

                        if(isset($_REQUEST["tbltplcrt"]))
                        {
                                $ilCtrl->setParameter($this->parent_obj, "tbltplcrt", $_REQUEST["tbltplcrt"]);
                        }
                        if(isset($_REQUEST["tbltpldel"]))
                        {
                                $ilCtrl->setParameter($this->parent_obj, "tbltpldel", $_REQUEST["tbltpldel"]);
                        }

                        $ilCtrl->redirect($this->parent_obj, $this->parent_cmd);
                }
        else
                {
                        // e.g. repository selector
                        return parent::executeCommand();
                }
        }
        
        protected function sendMail(array $a_user_ids, $a_parent_obj, $a_parent_cmd)
        {       
                // see ilObjCourseGUI::sendMailToSelectedUsersObject()
                
                require_once 'Services/Mail/classes/class.ilMailFormCall.php';
                
                $rcps = array();
                foreach($a_user_ids as $usr_id)
                {
                        $rcps[] = ilObjUser::_lookupLogin($usr_id);
                }
                
                $template = array();
                $sig = null;
                
                // repository-object-specific
                $ref_id = (int)$_REQUEST["ref_id"];
                if($ref_id)
                {                                                       
                        $obj_lp = ilObjectLP::getInstance(ilObject::_lookupObjectId($ref_id));
                        $tmpl_id = $obj_lp->getMailTemplateId();
        
                        if($tmpl_id)
                        {
                                $template = array(
                                        ilMailFormCall::CONTEXT_KEY => $tmpl_id,
                                        'ref_id' => $ref_id,
                                        'ts'     => time()
                                );
                        }
                        else
                        {
                                include_once './Services/Link/classes/class.ilLink.php';
                                $sig = ilLink::_getLink($ref_id);
                                $sig = rawurlencode(base64_encode($sig));                       
                        }
                }
                
                ilUtil::redirect(
                        ilMailFormCall::getRedirectTarget(
                                $a_parent_obj, 
                                $a_parent_cmd,
                                array(),
                                array(
                                        'type' => 'new',
                                        'rcp_to' => implode(',', $rcps),
                                        'sig' => $sig
                                ),
                                $template
                        )
                );      
        }

        protected function searchObjects(array $filter, $permission, array $preset_obj_ids = null, $a_check_lp_activation = true)
        {
                global $ilObjDataCache;
                                
                include_once './Services/Search/classes/class.ilQueryParser.php';

                $query_parser = new ilQueryParser($filter["query"]);
                $query_parser->setMinWordLength(0);
                $query_parser->setCombination(QP_COMBINATION_AND);
                $query_parser->parse();
                if(!$query_parser->validate())
                {
                        ilLoggerFactory::getLogger('trac')->notice($query_parser->getMessage());
                        // echo $query_parser->getMessage();
                        return false;
                }

                if($filter["type"] == "lres")
                {
                        $filter["type"] = array('lm','sahs','htlm');
                }
                else
                {
                        $filter["type"] = array($filter["type"]);
                }

                include_once 'Services/Search/classes/Like/class.ilLikeObjectSearch.php';
                $object_search = new ilLikeObjectSearch($query_parser);
                $object_search->setFilter($filter["type"]);
                if($preset_obj_ids)
                {
                        $object_search->setIdFilter($preset_obj_ids);
                }               
                $res =& $object_search->performSearch();

                if($permission)
                {
                        $res->setRequiredPermission($permission);
                }

                $res->setMaxHits(1000);
                
                if($a_check_lp_activation)
                {
                        $res->addObserver($this, "searchFilterListener");
                }
                
                if(!$this->filter["area"])
                {
                        $res->filter(ROOT_FOLDER_ID, false);
                }
                else
                {
                        $res->filter($this->filter["area"], false);
                }

                $objects = array();
                foreach($res->getResults() as $obj_data)
                {
                        $objects[$obj_data['obj_id']][] = $obj_data['ref_id'];
                }

                // Check if search max hits is reached
                if($res->isLimitReached())
                {                       
                        $this->lng->loadLanguageModule("search");
                        ilUtil::sendFailure(sprintf($this->lng->txt("search_limit_reached"), 1000));
                }

                return $objects ? $objects : array();
        }

        public function searchFilterListener($a_ref_id, $a_data)
        {
                if(is_array($this->filter["hide"]) && in_array($a_data["obj_id"], $this->filter["hide"]))
                {
                        return false;
                }               
                $olp = ilObjectLP::getInstance($a_data["obj_id"]);
                if(get_class($olp) != "ilObjectLP" && // #13654 - LP could be unsupported
                        !$olp->isActive())
                {
                        return false;
                }
                return true;
        }
        
        public function initBaseFilter($a_split_learning_resources = false, $a_include_no_status_filter = true)
        {
                global $lng, $ilObjDataCache;
                
                $this->setDisableFilterHiding(true);
                
                // object type selection
                include_once("./Services/Form/classes/class.ilSelectInputGUI.php");
                $si = new ilSelectInputGUI($this->lng->txt("obj_type"), "type");
                $si->setOptions($this->getPossibleTypes($a_split_learning_resources));
                $this->addFilterItem($si);
                $si->readFromSession();
                if(!$si->getValue())
                {
                        $si->setValue("crs");
                }
                $this->filter["type"] = $si->getValue();

                // hidden items
                include_once("./Services/Form/classes/class.ilMultiSelectInputGUI.php");
                $msi = new ilMultiSelectInputGUI($lng->txt("trac_filter_hidden"), "hide");
                $this->addFilterItem($msi);
                $msi->readFromSession();
                $this->filter["hide"] = $msi->getValue();
                if($this->filter["hide"])
                {
                        // create options from current value
                        $types = $this->getCurrentFilter(true);                 
                        $type = $types["type"];
                        $options = array();
                        if($type == 'lres')
                        {
                                $type = array('lm','sahs','htlm');
                        }
                        else
                        {
                                $type = array($type);
                        }
                        foreach($this->filter["hide"] as $obj_id)
                        {
                                if(in_array($ilObjDataCache->lookupType($obj_id), $type))
                                {               
                                        $options[$obj_id] = $ilObjDataCache->lookupTitle($obj_id);
                                }
                        }
                        $msi->setOptions($options);
                }

                // title/description
                include_once("./Services/Form/classes/class.ilTextInputGUI.php");
                $ti = new ilTextInputGUI($lng->txt("trac_title_description"), "query");
                $ti->setMaxLength(64);
                $ti->setSize(20);
                $this->addFilterItem($ti);
                $ti->readFromSession();
                $this->filter["query"] = $ti->getValue();
                
                // repository area selection
                include_once("./Services/Form/classes/class.ilRepositorySelectorInputGUI.php");
                $rs = new ilRepositorySelectorInputGUI($lng->txt("trac_filter_area"), "area");
                $rs->setSelectText($lng->txt("trac_select_area"));
                $this->addFilterItem($rs);
                $rs->readFromSession();
                $this->filter["area"] = $rs->getValue();
                
                // hide "not started yet"
                if($a_include_no_status_filter)
                {
                        include_once("./Services/Form/classes/class.ilCheckboxInputGUI.php");
                        $cb = new ilCheckboxInputGUI($lng->txt("trac_filter_has_status"), "status");
                        $this->addFilterItem($cb);
                        $cb->readFromSession();
                        $this->filter["status"] = $cb->getChecked();
                }
        }

        protected function buildPath($ref_ids)
        {
                global $tree, $ilCtrl;

                include_once './Services/Link/classes/class.ilLink.php';
                
                if(!count($ref_ids))
                {
                        return false;
                }
                foreach($ref_ids as $ref_id)
                {
                        $path = "...";
                        $counter = 0;
                        $path_full = $tree->getPathFull($ref_id);
                        foreach($path_full as $data)
                        {
                                if(++$counter < (count($path_full)-1))
                                {
                                        continue;
                                }
                                $path .= " &raquo; ";
                                if($ref_id != $data['ref_id'])
                                {
                                        $path .= $data['title'];
                                }
                                else
                                {
                                        $path .= ('<a target="_top" href="'.
                                                          ilLink::_getLink($data['ref_id'],$data['type']).'">'.
                                                          $data['title'].'</a>');
                                }
                        }

                        $result[$ref_id] = $path;
                }
                return $result;
        }

        protected function getPossibleTypes($a_split_learning_resources = false, $a_include_digilib = false, $a_allow_undefined_lp = false)
        {
                global $lng, $ilPluginAdmin;

                $options = array();

                if($a_split_learning_resources)
                {
                        $options['lm'] = $lng->txt('objs_lm');
                        $options['sahs'] = $lng->txt('objs_sahs');
                        $options['htlm'] = $lng->txt('objs_htlm');
                }
                else
                {
                        $options['lres'] = $lng->txt('learning_resources');
                }

                $options['crs'] = $lng->txt('objs_crs');
                $options['grp'] = $lng->txt('objs_grp');
                $options['exc'] = $lng->txt('objs_exc');
                $options['file'] = $lng->txt('objs_file');
                $options['mcst'] = $lng->txt('objs_mcst');
                $options['svy'] = $lng->txt('objs_svy');                
                $options['tst'] = $lng->txt('objs_tst');                
                $options['prg'] = $lng->txt('objs_prg');
                $options['iass'] = $lng->txt('objs_iass');
                
                if($a_allow_undefined_lp)
                {                       
                        $options["webr"] = $lng->txt("objs_webr");
                        $options["wiki"] = $lng->txt("objs_wiki");
                        $options["blog"] = $lng->txt("objs_blog");
                        $options["prtf"] = $lng->txt("objs_prtf");
                        $options["prtt"] = $lng->txt("objs_prtt");
                }
                
                // repository plugins (currently only active)
                include_once 'Services/Repository/classes/class.ilRepositoryObjectPluginSlot.php';      
                $pl_names = $ilPluginAdmin->getActivePluginsForSlot(IL_COMP_SERVICE, "Repository", "robj");
                foreach ($pl_names as $pl)
                {
                        $pl_id = $ilPluginAdmin->getId(IL_COMP_SERVICE, "Repository", "robj", $pl);
                        if(ilRepositoryObjectPluginSlot::isTypePluginWithLP($pl_id))
                        {
                                $options[$pl_id] = ilObjectPlugin::lookupTxtById($pl_id, "objs_".$pl_id);
                        }
                }
                
                asort($options);
                return $options;
        }

        protected function parseValue($id, $value, $type)
        {
                global $lng;

                // get rid of aggregation
                $pos = strrpos($id, "_");
                if($pos !== false)
                {
                        $function = strtoupper(substr($id, $pos+1));
                        if(in_array($function, array("MIN", "MAX", "SUM", "AVG", "COUNT")))
                        {
                                $id = substr($id, 0, $pos);
                        }
                }

                if(trim($value) == "" && $id != "status")
                {
                        if($id == "title" && 
                                get_class($this) != "ilTrObjectUsersPropsTableGUI" &&
                                get_class($this) != "ilTrMatrixTableGUI")
                        {
                                return "--".$lng->txt("none")."--";
                        }
                        return " ";
                }

                switch($id)
                {
                        case "first_access":
                        case "create_date":
                        case 'status_changed':
                                $value = ilDatePresentation::formatDate(new ilDateTime($value, IL_CAL_DATETIME));
                                break;

                        case "last_access":
                                $value = ilDatePresentation::formatDate(new ilDateTime($value, IL_CAL_UNIX));
                                break;

                        case "birthday":
                                $value = ilDatePresentation::formatDate(new ilDate($value, IL_CAL_DATE));
                                break;

                        case "spent_seconds":
                                if(!ilObjectLP::supportsSpentSeconds($type))                            
                                {
                                        $value = "-";
                                }
                                else
                                {                                       
                                        $value = ilDatePresentation::secondsToString($value, ($value < 3600 ? true : false)); // #14858                                 
                                }
                                break;

                        case "percentage":                              
                            if(false /* $this->isPercentageAvailable() */)
                                {
                                        $value = "-";
                                }
                                else
                                {
                                        $value = $value."%";
                                }
                                break;

                        case "mark":
                                if(!ilObjectLP::supportsMark($type))                    
                                {
                                        $value = "-";
                                }
                                break;

                        case "gender":
                                $value = $lng->txt("gender_".$value);
                                break;

                        case "status":
                                include_once("./Services/Tracking/classes/class.ilLearningProgressBaseGUI.php");
                                $path = ilLearningProgressBaseGUI::_getImagePathForStatus($value);
                                $text = ilLearningProgressBaseGUI::_getStatusText($value);
                                $value = ilUtil::img($path, $text);
                                break;

                        case "language":
                                $lng->loadLanguageModule("meta");
                                $value = $lng->txt("meta_l_".$value);
                                break;

                        case "sel_country":
                                $value = $lng->txt("meta_c_".$value);
                                break;
                }

                return $value;
        }

        public function getCurrentFilter($as_query = false)
        {
                $result = array();
                foreach((array)$this->filter as $id => $value)
                {
                        $item = $this->getFilterItemByPostVar($id);
                        switch($id)
                        {
                                case "title":
                                case "country":
                                case "gender":
                                case "city":
                                case "language":
                                case "login":
                                case "firstname":
                                case "lastname":
                                case "mark":
                                case "u_comment":
                                case "institution":
                                case "department":
                                case "title":
                                case "street":
                                case "zipcode":
                                case "email":
                                case "matriculation":
                                case "sel_country":
                                case "query":
                                case "type":
                                case "area":
                                        if($value)
                                        {
                                                $result[$id] = $value;
                                        }
                                        break;

                                case "status":
                                        if($value !== false)
                                        {
                                                $result[$id] = $value;
                                        }
                                        break;

                                case "user_total":
                                case "read_count":
                                case "percentage":
                                case "hide":
                                case "spent_seconds":
                                        if(is_array($value) && implode("", $value))
                                        {
                                                $result[$id] = $value;
                                        }
                                        break;

                                 case "registration":
                                 case "create_date":
                                 case "first_access":
                                 case "last_access":                            
                                 case 'status_changed':
                                         if($value)
                                         {
                                                 if($value["from"])
                                                 {
                                                         $result[$id]["from"] = $value["from"]->get(IL_CAL_DATETIME);
                                                 }
                                                 if($value["to"])
                                                 {
                                                         $result[$id]["to"] = $value["to"]->get(IL_CAL_DATETIME);
                                                 }
                                         }
                                         break;
                                         
                                 case "birthday":
                                         if($value)
                                         {
                                                 if($value["from"])
                                                 {
                                                         $result[$id]["from"] = $value["from"]->get(IL_CAL_DATETIME);
                                                         $result[$id]["from"] = substr($result[$id]["from"], 0, -8)."00:00:00";
                                                 }
                                                 if($value["to"])
                                                 {
                                                         $result[$id]["to"] = $value["to"]->get(IL_CAL_DATETIME);
                                                         $result[$id]["to"] = substr($result[$id]["to"], 0, -8)."23:59:59";
                                                 }
                                         }
                                         break;
                  }
                }

                return $result;
        }

        protected function isPercentageAvailable($a_obj_id)
        {
                // :TODO:
                $olp = ilObjectLP::getInstance($a_obj_id);
                $mode = $olp->getCurrentMode();
                if(in_array($mode, array(ilLPObjSettings::LP_MODE_TLT, 
                        ilLPObjSettings::LP_MODE_VISITS, 
                        // ilLPObjSettings::LP_MODE_OBJECTIVES, 
                        ilLPObjSettings::LP_MODE_SCORM,
                        ilLPObjSettings::LP_MODE_VISITED_PAGES,
                        ilLPObjSettings::LP_MODE_TEST_PASSED)))
                {
                        return true;
                }
                return false;
        }

        protected function parseTitle($a_obj_id, $action, $a_user_id = false)
        {
                global $lng, $ilObjDataCache, $ilUser;

                $user = "";
                if($a_user_id)
                {
                        if($a_user_id != $ilUser->getId())
                        {
                                $a_user = ilObjectFactory::getInstanceByObjId($a_user_id);
                        }
                        else
                        {
                                $a_user = $ilUser;
                        }
                        $user .= ", ".$a_user->getFullName(); // " [".$a_user->getLogin()."]";
                }

                if($a_obj_id != ROOT_FOLDER_ID)
                {
                        $this->setTitle($lng->txt($action).": ".$ilObjDataCache->lookupTitle($a_obj_id).$user);
                        
                        $olp = ilObjectLP::getInstance($a_obj_id);
                        $this->setDescription($this->lng->txt('trac_mode').": ".$olp->getModeText($olp->getCurrentMode()));
                }
                else
                {
                        $this->setTitle($lng->txt($action));
                }
        }

        protected function getExportMeta()
        {
                global $lng, $ilObjDataCache, $ilUser, $ilClientIniFile;

                /* see spec
                        Name of installation
                        Name of the course
                        Permalink to course
                        Owner of course object
                        Date of report generation
                        Reporting period
                        Name of person who generated the report.
                */

            ilDatePresentation::setUseRelativeDates(false);
                include_once './Services/Link/classes/class.ilLink.php';
                
                $data = array();
                $data[$lng->txt("trac_name_of_installation")] = $ilClientIniFile->readVariable('client', 'name');
                
                if($this->obj_id)
                {
                        $data[$lng->txt("trac_object_name")] = $ilObjDataCache->lookupTitle($this->obj_id);
                        if($this->ref_id)
                        {
                                $data[$lng->txt("trac_object_link")] = ilLink::_getLink($this->ref_id, ilObject::_lookupType($this->obj_id));
                        }
                        $data[$lng->txt("trac_object_owner")] = ilObjUser::_lookupFullname(ilObject::_lookupOwner($this->obj_id));
                }
                
                $data[$lng->txt("trac_report_date")] =
                                ilDatePresentation::formatDate(new ilDateTime(time(), IL_CAL_UNIX), IL_CAL_DATETIME);
                $data[$lng->txt("trac_report_owner")] = $ilUser->getFullName();
                
                return $data;
        }

        protected function fillMetaExcel(ilExcel $a_excel, &$a_row)
        {
                foreach($this->getExportMeta() as $caption => $value)
                {
                        $a_excel->setCell($a_row, 0, $caption);
                        $a_excel->setCell($a_row, 1, $value);
                        $a_row++;
                }
                $a_row++;
        }
        
        protected function fillMetaCSV($a_csv)
        {
                foreach($this->getExportMeta() as $caption => $value)
                {
                        $a_csv->addColumn(strip_tags($caption));
                        $a_csv->addColumn(strip_tags($value));
                        $a_csv->addRow();
                }
                $a_csv->addRow();
        }

        protected function showTimingsWarning($a_ref_id, $a_user_id)
        {
                include_once 'Modules/Course/classes/Timings/class.ilTimingCache.php';
                if(ilTimingCache::_showWarning($a_ref_id, $a_user_id))
                {
                        $timings = ilTimingCache::_getTimings($a_ref_id);
                        if($timings['item']['changeable'] && $timings['user'][$a_user_id]['end'])
                        {
                                $end = $timings['user'][$a_user_id]['end'];
                        }
                        else if ($timings['item']['suggestion_end'])
                        {
                                $end = $timings['item']['suggestion_end'];
                        }
                        else
                        {
                                $end = true;
                        }
                        return $end;
                }
        }
        
        protected function formatSeconds($seconds, $a_shorten_zero = false)
        {
                $seconds = ((int)$seconds > 0) ? $seconds : 0;
                if($a_shorten_zero && !$seconds)
                {
                        return "-";
                }
                
                $hours = floor($seconds / 3600);                
                $rest = $seconds % 3600;
                
                $minutes = floor($rest / 60);
                $rest = $rest % 60;
                
                if($rest)
                {
                        $minutes++;
                }
                
                return sprintf("%dh%02dm",$hours,$minutes);
        }
        
        protected function anonymizeValue($a_value, $a_force_number = false)
        {
                // currently inactive
                return $a_value;
                
                if(is_numeric($a_value))
                {
                        $threshold = 3;         
                        $a_value = (int)$a_value;
                        if($a_value <= $threshold)
                        {
                                if(!$a_force_number)
                                {
                                        return "0-".$threshold;
                                }
                                else
                                {
                                        return $threshold;
                                }
                        }
                }
                return $a_value;
        }
        
        protected function buildValueScale($a_max_value, $a_anonymize = false, $a_format_seconds = false)
        {
                $step = 0;
                if($a_max_value)
                {
                        $step = $a_max_value / 10;
                        $base = ceil(log($step, 10));           
                        $fac = ceil($step / pow(10, ($base - 1)));
                        $step = pow(10, $base - 1) * $fac;
                }
                if ($step <= 1)
                {
                        $step = 1;
                }
                $ticks = range(0, $a_max_value+$step, $step);
                
                $value_ticks = array(0 => 0);
                foreach($ticks as $tick)
                {
                        $value = $tvalue = $tick;
                        if($a_anonymize)
                        {
                                $value = $this->anonymizeValue($value, true);
                                $tvalue = $this->anonymizeValue($tvalue);
                        }
                        if($a_format_seconds)
                        {
                                $tvalue = $this->formatSeconds($value);
                        }
                        $value_ticks[$value] = $tvalue;                         
                }       
        
                return $value_ticks;
        }
        
        protected function getMonthsFilter($a_short = false)
        {
                global $lng;
                
                $options = array();
                for($loop = 0; $loop < 10; $loop++)
                {
                        $year = date("Y")-$loop;
                        $options[$year] = $year;
                        for($loop2 = 12; $loop2 > 0; $loop2--)
                        {
                                $month = str_pad($loop2, 2, "0", STR_PAD_LEFT);
                                if($year.$month <= date("Ym"))
                                {
                                        if(!$a_short)
                                        {
                                                $caption = $year." / ".$lng->txt("month_".$month."_long");
                                        }
                                        else
                                        {
                                                $caption = $year."/".$month;
                                        }
                                        $options[$year."-".$month] = $caption;
                                }
                        }
                }
                return $options;
        }
        
        protected function getMonthsYear($a_year = null, $a_short = false)
        {
                global $lng;
                
                if(!$a_year)
                {
                        $a_year = date("Y");
                }
                
                $all = array();
                for($loop = 1; $loop<13; $loop++)
                {
                        $month = str_pad($loop, 2, "0", STR_PAD_LEFT);
                        if($a_year."-".$month <= date("Y-m"))
                        {
                                if(!$a_short)
                                {
                                        $caption = $lng->txt("month_".$month."_long");
                                }
                                else
                                {
                                        $caption = $lng->txt("month_".$month."_short");
                                }                       
                                $all[$a_year."-".$month] = $caption;
                        }
                }
                return $all;
        }
                
        protected function getSelectableUserColumns($a_in_course = false, $a_in_group = false)
        {
                global $lng, $ilSetting;
                
                $cols = $privacy_fields = array();      
                
                include_once("./Services/User/classes/class.ilUserProfile.php");
                $up = new ilUserProfile();
                $up->skipGroup("preferences");
                $up->skipGroup("settings");
                $up->skipGroup("interests");
                $ufs = $up->getStandardFields();

                // default fields
                $cols["login"] = array(
                        "txt" => $lng->txt("login"),
                        "default" => true);

                if(!$this->anonymized)
                {
                        $cols["firstname"] = array(
                                "txt" => $lng->txt("firstname"),
                                "default" => true);
                        $cols["lastname"] = array(
                                "txt" => $lng->txt("lastname"),
                                "default" => true);
                }

                // show only if extended data was activated in lp settings
                include_once 'Services/Tracking/classes/class.ilObjUserTracking.php';
                $tracking = new ilObjUserTracking();
                if($tracking->hasExtendedData(ilObjUserTracking::EXTENDED_DATA_LAST_ACCESS))
                {
                        $cols["first_access"] = array(
                                "txt" => $lng->txt("trac_first_access"),
                                "default" => true);
                        $cols["last_access"] = array(
                                "txt" => $lng->txt("trac_last_access"),
                                "default" => true);
                }
                if($tracking->hasExtendedData(ilObjUserTracking::EXTENDED_DATA_READ_COUNT))
                {
                        $cols["read_count"] = array(
                                "txt" => $lng->txt("trac_read_count"),
                                "default" => true);
                }
                if($tracking->hasExtendedData(ilObjUserTracking::EXTENDED_DATA_SPENT_SECONDS) &&
                        ilObjectLP::supportsSpentSeconds($this->type))
                {
                        $cols["spent_seconds"] = array(
                                "txt" => $lng->txt("trac_spent_seconds"),
                                "default" => true);
                }

                if($this->isPercentageAvailable($this->obj_id))
                {
                        $cols["percentage"] = array(
                                "txt" => $lng->txt("trac_percentage"),
                                "default" => true);
                }

                // do not show status if learning progress is deactivated
                $olp = ilObjectLP::getInstance($this->obj_id);
                if($olp->isActive())
                {
                        $cols["status"] = array(
                                "txt" => $lng->txt("trac_status"),
                                "default" => true);

                        $cols['status_changed'] = array(
                                'txt' => $lng->txt('trac_status_changed'),
                                'default' => false);
                }

                if(ilObjectLP::supportsMark($this->type))
                {
                        $cols["mark"] = array(
                                "txt" => $lng->txt("trac_mark"),
                                "default" => true);
                }

                $cols["u_comment"] = array(
                        "txt" => $lng->txt("trac_comment"),
                        "default" => false);

                $cols["create_date"] = array(
                        "txt" => $lng->txt("create_date"),
                        "default" => false);
                $cols["language"] = array(
                        "txt" => $lng->txt("language"),
                        "default" => false);

            // add user data only if object is [part of] course
                if(!$this->anonymized && 
                        ($a_in_course || $a_in_group))
                {                                               
                        // only show if export permission is granted
                        include_once('Services/PrivacySecurity/classes/class.ilPrivacySettings.php');
                        if(ilPrivacySettings::_getInstance()->checkExportAccess($this->ref_id))
                        {                                                                                       
                                // other user profile fields
                                foreach ($ufs as $f => $fd)
                                {
                                        if (!isset($cols[$f]) && $f != "username" && !$fd["lists_hide"])
                                        {
                                                if($a_in_course && 
                                                        !($fd["course_export_fix_value"] || $ilSetting->get("usr_settings_course_export_".$f)))
                                                {
                                                        continue;
                                                }
                                                if($a_in_group && 
                                                        !($fd["group_export_fix_value"] || $ilSetting->get("usr_settings_group_export_".$f)))
                                                {
                                                        continue;
                                                }

                                                $cols[$f] = array(
                                                        "txt" => $lng->txt($f),
                                                        "default" => false);

                                                $privacy_fields[] = $f;
                                        }
                                }

                                // additional defined user data fields
                                include_once './Services/User/classes/class.ilUserDefinedFields.php';
                                $user_defined_fields = ilUserDefinedFields::_getInstance();                     
                                if($a_in_course)
                                {
                                        $user_defined_fields = $user_defined_fields->getCourseExportableFields();
                                }
                                else
                                {
                                        $user_defined_fields = $user_defined_fields->getGroupExportableFields();
                                }                       
                                foreach($user_defined_fields as $definition)
                                {
                                        if($definition["field_type"] != UDF_TYPE_WYSIWYG)
                                        {
                                                $f = "udf_".$definition["field_id"];
                                                $cols[$f] = array(
                                                                "txt" => $definition["field_name"],
                                                                "default" => false);

                                                $privacy_fields[] = $f;
                                        }
                                }
                        }
                }

                return array($cols, $privacy_fields);           
        }
        
        protected function addToClipboard()
        {
                $users = (array) $_POST['uid'];
                include_once './Services/User/classes/class.ilUserClipboard.php';
                $clip = ilUserClipboard::getInstance($GLOBALS['ilUser']->getId());
                $clip->add($users);
                $clip->save();
                
                $GLOBALS['lng']->loadLanguageModule('user');
                ilUtil::sendSuccess($this->lng->txt('clipboard_user_added'),true);
                
        }
}

?>