<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
/**
 * Core Report class of objectives SCORM report plugin
 * @package   scormreport_objectives
 * @author    Dan Marsden <dan@danmarsden.com>
 * @copyright 2013 Dan Marsden
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot.'/mod/scorm/report/objectives/responsessettings_form.php');

/**
 * Objectives report class
 *
 * @copyright  2013 Dan Marsden
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class scorm_objectives_report extends scorm_default_report {
    /**
     * displays the full report
     * @param stdClass $scorm full SCORM object
     * @param stdClass $cm - full course_module object
     * @param stdClass $course - full course object
     * @param string $download - type of download being requested
     */
    public function display($scorm, $cm, $course, $download) {
        global $CFG, $DB, $OUTPUT, $PAGE;

        $contextmodule = context_module::instance($cm->id);
        $action = optional_param('action', '', PARAM_ALPHA);
        $attemptids = optional_param_array('attemptid', array(), PARAM_RAW);
        $attemptsmode = optional_param('attemptsmode', SCORM_REPORT_ATTEMPTS_ALL_STUDENTS, PARAM_INT);
        $PAGE->set_url(new moodle_url($PAGE->url, array('attemptsmode' => $attemptsmode)));

        if ($action == 'delete' && has_capability('mod/scorm:deleteresponses', $contextmodule) && confirm_sesskey()) {
            if (scorm_delete_responses($attemptids, $scorm)) { // Delete responses.
                add_to_log($course->id, 'scorm', 'delete attempts', 'report.php?id=' . $cm->id, implode(",", $attemptids), $cm->id);
                echo $OUTPUT->notification(get_string('scormresponsedeleted', 'scorm'), 'notifysuccess');
            }
        }
        // Find out current groups mode.
        $currentgroup = groups_get_activity_group($cm, true);

        // Detailed report.
        $mform = new mod_scorm_report_objectives_settings($PAGE->url, compact('currentgroup'));
        if ($fromform = $mform->get_data()) {
            $pagesize = $fromform->pagesize;
            $showobjectivescore = $fromform->objectivescore;
            set_user_preference('scorm_report_pagesize', $pagesize);
            set_user_preference('scorm_report_objectives_score', $showobjectivescore);
        } else {
            $pagesize = get_user_preferences('scorm_report_pagesize', 0);
            $showobjectivescore = get_user_preferences('scorm_report_objectives_score', 0);
        }
        if ($pagesize < 1) {
            $pagesize = SCORM_REPORT_DEFAULT_PAGE_SIZE;
        }

        // Select group menu.
        $displayoptions = array();
        $displayoptions['attemptsmode'] = $attemptsmode;
        $displayoptions['objectivescore'] = $showobjectivescore;

        $mform->set_data($displayoptions + array('pagesize' => $pagesize));
        if ($groupmode = groups_get_activity_groupmode($cm)) {   // Groups are being used.
            if (!$download) {
                groups_print_activity_menu($cm, new moodle_url($PAGE->url, $displayoptions));
            }
        }
        $formattextoptions = array('context' => context_course::instance($course->id));

        // We only want to show the checkbox to delete attempts
        // if the user has permissions and if the report mode is showing attempts.
        $candelete = has_capability('mod/scorm:deleteresponses', $contextmodule)
                && ($attemptsmode != SCORM_REPORT_ATTEMPTS_STUDENTS_WITH_NO);
        // Select the students.
        $nostudents = false;

        if (empty($currentgroup)) {
            // All users who can attempt scoes.
            if (!$students = get_users_by_capability($contextmodule, 'mod/scorm:savetrack', 'u.id', '', '', '', '', '', false)) {
                echo $OUTPUT->notification(get_string('nostudentsyet'));
                $nostudents = true;
                $allowedlist = '';
            } else {
                $allowedlist = array_keys($students);
            }
            unset($students);
        } else {
            // All users who can attempt scoes and who are in the currently selected group.
            $groupstudents = get_users_by_capability($contextmodule, 'mod/scorm:savetrack',
                                                     'u.id', '', '', '', $currentgroup, '', false);
            if (!$groupstudents) {
                echo $OUTPUT->notification(get_string('nostudentsingroup'));
                $nostudents = true;
                $groupstudents = array();
            }
            $allowedlist = array_keys($groupstudents);
            unset($groupstudents);
        }
        if ( !$nostudents ) {
            // Now check if asked download of data.
            $coursecontext = context_course::instance($course->id);
            if ($download) {
                $filename = clean_filename("$course->shortname ".format_string($scorm->name, true, $formattextoptions));
            }

            // Define table columns.
            $columns = array();
            $headers = array();
            if (!$download && $candelete) {
                $columns[] = 'checkbox';
                $headers[] = null;
            }
            if (!$download && $CFG->grade_report_showuserimage) {
                $columns[] = 'picture';
                $headers[] = '';
            }
            $columns[] = 'fullname';
            $headers[] = get_string('name');

            $extrafields = get_extra_user_fields($coursecontext);
            foreach ($extrafields as $field) {
                $columns[] = $field;
                $headers[] = get_user_field_name($field);
            }
            $columns[] = 'attempt';
            $headers[] = get_string('attempt', 'scorm');
            $columns[] = 'start';
            $headers[] = get_string('started', 'scorm');
            $columns[] = 'finish';
            $headers[] = get_string('last', 'scorm');
            $columns[] = 'score';
            $headers[] = get_string('score', 'scorm');
            $scoes = $DB->get_records('scorm_scoes', array("scorm" => $scorm->id), 'sortorder, id');
            foreach ($scoes as $sco) {
                if ($sco->launch != '') {
                    $columns[] = 'scograde'.$sco->id;
                    $headers[] = format_string($sco->title, '', $formattextoptions);
                }
            }

            $params = array();
            list($usql, $params) = $DB->get_in_or_equal($allowedlist, SQL_PARAMS_NAMED);
            // Construct the SQL.
            $select = 'SELECT DISTINCT '.$DB->sql_concat('u.id', '\'#\'', 'COALESCE(st.attempt, 0)').' AS uniqueid, ';
            $select .= 'st.scormid AS scormid, st.attempt AS attempt, ' .
                    user_picture::fields('u', array('idnumber'), 'userid') .
                    get_extra_user_fields_sql($coursecontext, 'u', '', array('email', 'idnumber')) . ' ';

            // This part is the same for all cases - join users and scorm_scoes_track tables.
            $from = 'FROM {user} u ';
            $from .= 'LEFT JOIN {scorm_scoes_track} st ON st.userid = u.id AND st.scormid = '.$scorm->id;
            switch ($attemptsmode) {
                case SCORM_REPORT_ATTEMPTS_STUDENTS_WITH:
                    // Show only students with attempts.
                    $where = ' WHERE u.id ' .$usql. ' AND st.userid IS NOT NULL';
                    break;
                case SCORM_REPORT_ATTEMPTS_STUDENTS_WITH_NO:
                    // Show only students without attempts.
                    $where = ' WHERE u.id ' .$usql. ' AND st.userid IS NULL';
                    break;
                case SCORM_REPORT_ATTEMPTS_ALL_STUDENTS:
                    // Show all students with or without attempts.
                    $where = ' WHERE u.id ' .$usql. ' AND (st.userid IS NOT NULL OR st.userid IS NULL)';
                    break;
            }

            $countsql = 'SELECT COUNT(DISTINCT('.$DB->sql_concat('u.id', '\'#\'', 'COALESCE(st.attempt, 0)').')) AS nbresults, ';
            $countsql .= 'COUNT(DISTINCT('.$DB->sql_concat('u.id', '\'#\'', 'st.attempt').')) AS nbattempts, ';
            $countsql .= 'COUNT(DISTINCT(u.id)) AS nbusers ';
            $countsql .= $from.$where;

            $nbmaincolumns = count($columns); // Get number of main columns used.

            $objectives = get_scorm_objectives($scorm->id);
            $nosort = array();
            foreach ($objectives as $scoid => $sco) {
                foreach ($sco as $id => $objectivename) {
                    $colid = $scoid.'objectivestatus' . $id;
                    $columns[] = $colid;
                    $nosort[] = $colid;

                    if (!$displayoptions['objectivescore']) {
                        // Display the objective name only.
                        $headers[] = $objectivename;
                    } else {
                        // Display the objective status header with a "status" suffix to avoid confusion.
                        $headers[] = $objectivename. ' '. get_string('status', 'scormreport_objectives');

                        // Now print objective score headers.
                        $colid = $scoid.'objectivescore' . $id;
                        $columns[] = $colid;
                        $nosort[] = $colid;
                        $headers[] = $objectivename. ' '. get_string('score', 'scormreport_objectives');
                    }
                }
            }

            $emptycell = ''; // Used when an empty cell is being printed - in html we add a space.
            if (!$download) {
                $emptycell = '&nbsp;';
                $table = new flexible_table('mod-scorm-report');

                $table->define_columns($columns);
                $table->define_headers($headers);
                $table->define_baseurl($PAGE->url);

                $table->sortable(true);
                $table->collapsible(true);

                // This is done to prevent redundant data, when a user has multiple attempts.
                $table->column_suppress('picture');
                $table->column_suppress('fullname');
                foreach ($extrafields as $field) {
                    $table->column_suppress($field);
                }
                foreach ($nosort as $field) {
                    $table->no_sorting($field);
                }

                $table->no_sorting('start');
                $table->no_sorting('finish');
                $table->no_sorting('score');

                foreach ($scoes as $sco) {
                    if ($sco->launch != '') {
                        $table->no_sorting('scograde'.$sco->id);
                    }
                }

                $table->column_class('picture', 'picture');
                $table->column_class('fullname', 'bold');
                $table->column_class('score', 'bold');

                $table->set_attribute('cellspacing', '0');
                $table->set_attribute('id', 'attempts');
                $table->set_attribute('class', 'generaltable generalbox');

                // Start working -- this is necessary as soon as the niceties are over.
                $table->setup();
            } else if ($download == 'ODS') {
                require_once("$CFG->libdir/odslib.class.php");

                $filename .= ".ods";
                // Creating a workbook.
                $workbook = new MoodleODSWorkbook("-");
                // Sending HTTP headers.
                $workbook->send($filename);
                // Creating the first worksheet.
                $sheettitle = get_string('report', 'scorm');
                $myxls = $workbook->add_worksheet($sheettitle);
                // Format types.
                $format = $workbook->add_format();
                $format->set_bold(0);
                $formatbc = $workbook->add_format();
                $formatbc->set_bold(1);
                $formatbc->set_align('center');
                $formatb = $workbook->add_format();
                $formatb->set_bold(1);
                $formaty = $workbook->add_format();
                $formaty->set_bg_color('yellow');
                $formatc = $workbook->add_format();
                $formatc->set_align('center');
                $formatr = $workbook->add_format();
                $formatr->set_bold(1);
                $formatr->set_color('red');
                $formatr->set_align('center');
                $formatg = $workbook->add_format();
                $formatg->set_bold(1);
                $formatg->set_color('green');
                $formatg->set_align('center');
                // Here starts workshhet headers.

                $colnum = 0;
                foreach ($headers as $item) {
                    $myxls->write(0, $colnum, $item, $formatbc);
                    $colnum++;
                }
                $rownum = 1;
            } else if ($download =='Excel') {
                require_once("$CFG->libdir/excellib.class.php");

                $filename .= ".xls";
                // Creating a workbook.
                $workbook = new MoodleExcelWorkbook("-");
                // Sending HTTP headers.
                $workbook->send($filename);
                // Creating the first worksheet.
                $sheettitle = get_string('report', 'scorm');
                $myxls = $workbook->add_worksheet($sheettitle);
                // Format types.
                $format = $workbook->add_format();
                $format->set_bold(0);
                $formatbc = $workbook->add_format();
                $formatbc->set_bold(1);
                $formatbc->set_align('center');
                $formatb = $workbook->add_format();
                $formatb->set_bold(1);
                $formaty = $workbook->add_format();
                $formaty->set_bg_color('yellow');
                $formatc = $workbook->add_format();
                $formatc->set_align('center');
                $formatr = $workbook->add_format();
                $formatr->set_bold(1);
                $formatr->set_color('red');
                $formatr->set_align('center');
                $formatg = $workbook->add_format();
                $formatg->set_bold(1);
                $formatg->set_color('green');
                $formatg->set_align('center');

                $colnum = 0;
                foreach ($headers as $item) {
                    $myxls->write(0, $colnum, $item, $formatbc);
                    $colnum++;
                }
                $rownum = 1;
            } else if ($download == 'CSV') {
                $csvexport = new csv_export_writer("tab");
                $csvexport->set_filename($filename, ".txt");
                $csvexport->add_data($headers);
            }

            if (!$download) {
                $sort = $table->get_sql_sort();
            } else {
                $sort = '';
            }
            // Fix some wired sorting.
            if (empty($sort)) {
                $sort = ' ORDER BY uniqueid';
            } else {
                $sort = ' ORDER BY '.$sort;
            }

            if (!$download) {
                // Add extra limits due to initials bar.
                list($twhere, $tparams) = $table->get_sql_where();
                if ($twhere) {
                    $where .= ' AND '.$twhere; // Initial bar.
                    $params = array_merge($params, $tparams);
                }

                if (!empty($countsql)) {
                    $count = $DB->get_record_sql($countsql, $params);
                    $totalinitials = $count->nbresults;
                    if ($twhere) {
                        $countsql .= ' AND '.$twhere;
                    }
                    $count = $DB->get_record_sql($countsql, $params);
                    $total  = $count->nbresults;
                }

                $table->pagesize($pagesize, $total);

                echo '<div class="quizattemptcounts">';
                if ( $count->nbresults == $count->nbattempts ) {
                    echo get_string('reportcountattempts', 'scorm', $count);
                } else if ( $count->nbattempts>0 ) {
                    echo get_string('reportcountallattempts', 'scorm', $count);
                } else {
                    echo $count->nbusers.' '.get_string('users');
                }
                echo '</div>';
            }

            // Fetch the attempts.
            if (!$download) {
                $attempts = $DB->get_records_sql($select.$from.$where.$sort, $params,
                $table->get_page_start(), $table->get_page_size());
                echo '<div id="scormtablecontainer">';
                if ($candelete) {
                    // Start form.
                    $strreallydel  = addslashes_js(get_string('deleteattemptcheck', 'scorm'));
                    echo '<form id="attemptsform" method="post" action="' . $PAGE->url->out(false) .
                         '" onsubmit="return confirm(\''.$strreallydel.'\');">';
                    echo '<input type="hidden" name="action" value="delete"/>';
                    echo '<input type="hidden" name="sesskey" value="'.sesskey().'" />';
                    echo '<div style="display: none;">';
                    echo html_writer::input_hidden_params($PAGE->url);
                    echo '</div>';
                    echo '<div>';
                }
                $table->initialbars($totalinitials>20); // Build table rows.
            } else {
                $attempts = $DB->get_records_sql($select.$from.$where.$sort, $params);
            }
            if ($attempts) {
                foreach ($attempts as $scouser) {
                    $row = array();
                    if (!empty($scouser->attempt)) {
                        $timetracks = scorm_get_sco_runtime($scorm->id, false, $scouser->userid, $scouser->attempt);
                    } else {
                        $timetracks = '';
                    }
                    if (in_array('checkbox', $columns)) {
                        if ($candelete && !empty($timetracks->start)) {
                            $row[] = '<input type="checkbox" name="attemptid[]" value="'.
                                     $scouser->userid . ':' . $scouser->attempt . '" />';
                        } else if ($candelete) {
                            $row[] = '';
                        }
                    }
                    if (in_array('picture', $columns)) {
                        $user = new stdClass();
                        $additionalfields = explode(',', user_picture::fields());
                        $user = username_load_fields_from_object($user, $scouser, null, $additionalfields);
                        $user->id = $scouser->userid;
                        $row[] = $OUTPUT->user_picture($user, array('courseid'=>$course->id));
                    }
                    if (!$download) {
                        $row[] = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$scouser->userid.
                                 '&amp;course='.$course->id.'">'.fullname($scouser).'</a>';
                    } else {
                        $row[] = fullname($scouser);
                    }
                    foreach ($extrafields as $field) {
                        $row[] = s($scouser->{$field});
                    }
                    if (empty($timetracks->start)) {
                        $row[] = '-';
                        $row[] = '-';
                        $row[] = '-';
                        $row[] = '-';
                    } else {
                        if (!$download) {
                            $row[] = '<a href="'.$CFG->wwwroot.'/mod/scorm/report/userreport.php?id='.$cm->id.
                                     '&amp;user='.$scouser->userid.'&amp;attempt='.$scouser->attempt.'">'.$scouser->attempt.'</a>';
                        } else {
                            $row[] = $scouser->attempt;
                        }
                        if ($download =='ODS' || $download =='Excel' ) {
                            $row[] = userdate($timetracks->start, get_string("strftimedatetime", "langconfig"));
                        } else {
                            $row[] = userdate($timetracks->start);
                        }
                        if ($download =='ODS' || $download =='Excel' ) {
                            $row[] = userdate($timetracks->finish, get_string('strftimedatetime', 'langconfig'));
                        } else {
                            $row[] = userdate($timetracks->finish);
                        }
                        $row[] = scorm_grade_user_attempt($scorm, $scouser->userid, $scouser->attempt);
                    }
                    // Print out all scores of attempt.
                    foreach ($scoes as $sco) {
                        if ($sco->launch != '') {
                            if ($trackdata = scorm_get_tracks($sco->id, $scouser->userid, $scouser->attempt)) {
                                if ($trackdata->status == '') {
                                    $trackdata->status = 'notattempted';
                                }
                                $strstatus = get_string($trackdata->status, 'scorm');

                                if ($trackdata->score_raw != '') { // If raw score exists, print it.
                                    $score = $trackdata->score_raw;
                                    // Add max score if it exists.
                                    if (isset($trackdata->score_max)) {
                                        $score .= '/'.$trackdata->score_max;
                                    }

                                } else { // ...else print out status.
                                    $score = $strstatus;
                                }
                                if (!$download) {
                                    $row[] = '<img src="'.$OUTPUT->pix_url($trackdata->status, 'scorm').'" alt="'.
                                             $strstatus.'" title="'.$strstatus.'" /><br/>
                                             <a href="'.$CFG->wwwroot.'/mod/scorm/report/userreporttracks.php?id='.$cm->id.'&amp;scoid='.
                                             $sco->id.'&amp;user='.$scouser->userid.'&amp;attempt='.$scouser->attempt.
                                             '" title="'.get_string('details', 'scorm').'">'.$score.'</a>';
                                } else {
                                    $row[] = $score;
                                }
                                // Iterate over tracks and match objective id against values.
                                $keywords = array("cmi.objectives_", ".id");
                                $objectivestatus = array();
                                $objectivescore = array();
                                foreach ($trackdata as $name => $value) {
                                    if (strpos($name, 'cmi.objectives_') === 0 && strrpos($name, '.id') !== false) {
                                        $num = trim(str_ireplace($keywords, '', $name));
                                        if (is_numeric($num)) {
                                            if (scorm_version_check($scorm->version, SCORM_13)) {
                                                $element='cmi.objectives_'.$num.'.completion_status';
                                            } else {
                                                $element='cmi.objectives_'.$num.'.status';
                                            }
                                            if (isset($trackdata->$element)) {
                                                $objectivestatus[$value] = $trackdata->$element;
                                            } else {
                                                $objectivestatus[$value] = '';
                                            }
                                            if ($displayoptions['objectivescore']) {
                                                $element='cmi.objectives_'.$num.'.score.raw';
                                                if (isset($trackdata->$element)) {
                                                    $objectivescore[$value] = $trackdata->$element;
                                                } else {
                                                    $objectivescore[$value] = '';
                                                }
                                            }
                                        }
                                    }
                                }

                                // Interaction data.
                                if (!empty($objectives[$trackdata->scoid])) {
                                    foreach ($objectives[$trackdata->scoid] as $name) {
                                        if (isset($objectivestatus[$name])) {
                                            $row[] = s($objectivestatus[$name]);
                                        } else {
                                            $row[] = $emptycell;
                                        }
                                        if ($displayoptions['objectivescore']) {
                                            if (isset($objectivescore[$name])) {
                                                $row[] = s($objectivescore[$name]);
                                            } else {
                                                $row[] = $emptycell;
                                            }

                                        }
                                    }
                                }
                                // End of interaction data.
                            } else {
                                // If we don't have track data, we haven't attempted yet.
                                $strstatus = get_string('notattempted', 'scorm');
                                if (!$download) {
                                    $row[] = '<img src="'.$OUTPUT->pix_url('notattempted', 'scorm').'" alt="'.
                                             $strstatus.'" title="'.$strstatus.'" /><br/>'.$strstatus;
                                } else {
                                    $row[] = $strstatus;
                                }
                                // Complete the empty cells.
                                for ($i=0; $i < count($columns) - $nbmaincolumns; $i++) {
                                    $row[] = $emptycell;
                                }
                            }
                        }
                    }

                    if (!$download) {
                        $table->add_data($row);
                    } else if ($download == 'Excel' or $download == 'ODS') {
                        $colnum = 0;
                        foreach ($row as $item) {
                            $myxls->write($rownum, $colnum, $item, $format);
                            $colnum++;
                        }
                        $rownum++;
                    } else if ($download == 'CSV') {
                        $csvexport->add_data($row);
                    }
                }
                if (!$download) {
                    $table->finish_output();
                    if ($candelete) {
                        echo '<table id="commands">';
                        echo '<tr><td>';
                        echo '<a href="javascript:select_all_in(\'DIV\', null, \'scormtablecontainer\');">'.
                             get_string('selectall', 'scorm').'</a> / ';
                        echo '<a href="javascript:deselect_all_in(\'DIV\', null, \'scormtablecontainer\');">'.
                             get_string('selectnone', 'scorm').'</a> ';
                        echo '&nbsp;&nbsp;';
                        echo '<input type="submit" value="'.get_string('deleteselected', 'quiz_overview').'"/>';
                        echo '</td></tr></table>';
                        // Close form.
                        echo '</div>';
                        echo '</form>';
                    }
                    echo '</div>';
                    if (!empty($attempts)) {
                        echo '<table class="boxaligncenter"><tr>';
                        echo '<td>';
                        echo $OUTPUT->single_button(new moodle_url($PAGE->url,
                                                                   array('download'=>'ODS') + $displayoptions),
                                                                   get_string('downloadods'));
                        echo "</td>\n";
                        echo '<td>';
                        echo $OUTPUT->single_button(new moodle_url($PAGE->url,
                                                                   array('download'=>'Excel') + $displayoptions),
                                                                   get_string('downloadexcel'));
                        echo "</td>\n";
                        echo '<td>';
                        echo $OUTPUT->single_button(new moodle_url($PAGE->url,
                                                                   array('download'=>'CSV') + $displayoptions),
                                                                   get_string('downloadtext'));
                        echo "</td>\n";
                        echo "<td>";
                        echo "</td>\n";
                        echo '</tr></table>';
                    }
                }
            } else {
                if ($candelete && !$download) {
                    echo '</div>';
                    echo '</form>';
                    $table->finish_output();
                }
                echo '</div>';
            }
            // Show preferences form irrespective of attempts are there to report or not.
            if (!$download) {
                $mform->set_data(compact('detailedrep', 'pagesize', 'attemptsmode'));
                $mform->display();
            }
            if ($download == 'Excel' or $download == 'ODS') {
                $workbook->close();
                exit;
            } else if ($download == 'CSV') {
                $csvexport->download_file();
                exit;
            }
        } else {
            echo $OUTPUT->notification(get_string('noactivity', 'scorm'));
        }
    }// Function ends.
}

/**
 * Returns The maximum numbers of Objectives associated with an Scorm Pack
 *
 * @param int $scormid Scorm instance id
 * @return array an array of possible objectives.
 */
function get_scorm_objectives($scormid) {
    global $DB;
    $objectives = array();
    $params = array();
    $select = "scormid = ? AND ";
    $select .= $DB->sql_like("element", "?", false);
    $params[] = $scormid;
    $params[] = "cmi.objectives_%.id";
    $rs = $DB->get_recordset_select("scorm_scoes_track", $select, $params, 'value', 'DISTINCT value, scoid');
    if ($rs->valid()) {
        foreach ($rs as $record) {
            $objectives[$record->scoid][] = $record->value;
        }
        // Now naturally sort the sco arrays.
        foreach ($objectives as $scoid => $sco) {
            natsort($objectives[$scoid]);
        }
    }
    $rs->close();
    return $objectives;
}
