<?php

function scorm_add_time($a, $b) {
    $aes = explode(':',$a);
    $bes = explode(':',$b);
    $aseconds = explode('.',$aes[2]);
    $bseconds = explode('.',$bes[2]);
    $change = 0;

    $acents = 0;  //Cents
    if (count($aseconds) > 1) {
        $acents = $aseconds[1];
    }
    $bcents = 0;
    if (count($bseconds) > 1) {
        $bcents = $bseconds[1];
    }
    $cents = $acents + $bcents;
    $change = floor($cents / 100);
    $cents = $cents - ($change * 100);
    if (floor($cents) < 10) {
        $cents = '0'. $cents;
    }

    $secs = $aseconds[0] + $bseconds[0] + $change;  //Seconds
    $change = floor($secs / 60);
    $secs = $secs - ($change * 60);
    if (floor($secs) < 10) {
        $secs = '0'. $secs;
    }

    $mins = $aes[1] + $bes[1] + $change;   //Minutes
    $change = floor($mins / 60);
    $mins = $mins - ($change * 60);
    if ($mins < 10) {
        $mins = '0' .  $mins;
    }

    $hours = $aes[0] + $bes[0] + $change;  //Hours
    if ($hours < 10) {
        $hours = '0' . $hours;
    }

    if ($cents != '0') {
        return $hours . ":" . $mins . ":" . $secs . '.' . $cents;
    } else {
        return $hours . ":" . $mins . ":" . $secs;
    }
}

/**
* Take the header row of an AICC definition file
* and returns sequence of columns and a pointer to
* the sco identifier column.
*
* @param string $row AICC header row
* @param string $mastername AICC sco identifier column
* @return mixed
*/
function scorm_get_aicc_columns($row,$mastername='system_id') {
    $tok = strtok(strtolower($row),"\",\n\r");
    $result->columns = array();
    $i=0;
    while ($tok) {
        if ($tok !='') {
            $result->columns[] = $tok;
            if ($tok == $mastername) {
                $result->mastercol = $i;
            }
            $i++;
        }
        $tok = strtok("\",\n\r");
    }
    return $result;
}

/**
* Given a colums array return a string containing the regular
* expression to match the columns in a text row.
*
* @param array $column The header columns
* @param string $remodule The regular expression module for a single column
* @return string
*/
function scorm_forge_cols_regexp($columns,$remodule='(".*")?,') {
    $regexp = '/^';
    foreach ($columns as $column) {
        $regexp .= $remodule;
    }
    $regexp = substr($regexp,0,-1) . '/';
    return $regexp;
}


function scorm_parse_aicc($scorm) {
    global $DB;

    if (!isset($scorm->cmid)) {
        $cm = get_coursemodule_from_instance('scorm', $scorm->id);
        $scorm->cmid = $cm->id;
    }
    $context = get_context_instance(CONTEXT_MODULE, $scorm->cmid);

    $fs = get_file_storage();

    $files = $fs->get_area_files($context->id, 'scorm_content', 0, '', false);


    $version = 'AICC';
    $ids = array();
    $courses = array();
    $extaiccfiles = array('crs','des','au','cst','ort','pre','cmp');

    foreach ($files as $file) {
        $filename = $file->get_filename();
        $ext = substr($filename,strrpos($filename,'.'));
        $extension = strtolower(substr($ext,1));
        if (in_array($extension,$extaiccfiles)) {
            $id = strtolower(basename($filename,$ext));
            $ids[$id]->$extension = $file;
        }
    }

    foreach ($ids as $courseid => $id) {
        if (isset($id->crs)) {
            $contents = $id->crs->get_content();
            $rows = explode("\r\n", $contents);
            if (is_array($rows)) {
                foreach ($rows as $row) {
                    if (preg_match("/^(.+)=(.+)$/",$row,$matches)) {
                        switch (strtolower(trim($matches[1]))) {
                            case 'course_id':
                                $courses[$courseid]->id = trim($matches[2]);
                            break;
                            case 'course_title':
                                $courses[$courseid]->title = trim($matches[2]);
                            break;
                            case 'version':
                                $courses[$courseid]->version = 'AICC_'.trim($matches[2]);
                            break;
                        }
                    }
                }
            }
        }
        if (isset($id->des)) {
            $contents = $id->des->get_content();
            $rows = explode("\r\n", $contents);
            $columns = scorm_get_aicc_columns($rows[0]);
            $regexp = scorm_forge_cols_regexp($columns->columns);
            for ($i=1;$i<count($rows);$i++) {
                if (preg_match($regexp,$rows[$i],$matches)) {
                    for ($j=0;$j<count($columns->columns);$j++) {
                        $column = $columns->columns[$j];
                        $courses[$courseid]->elements[substr(trim($matches[$columns->mastercol+1]),1,-1)]->$column = substr(trim($matches[$j+1]),1,-1);
                    }
                }
            }
        }
        if (isset($id->au)) {
            $contents = $id->au->get_content();
            $rows = explode("\r\n", $contents);
            $columns = scorm_get_aicc_columns($rows[0]);
            $regexp = scorm_forge_cols_regexp($columns->columns);
            for ($i=1;$i<count($rows);$i++) {
                if (preg_match($regexp,$rows[$i],$matches)) {
                    for ($j=0;$j<count($columns->columns);$j++) {
                        $column = $columns->columns[$j];
                        $courses[$courseid]->elements[substr(trim($matches[$columns->mastercol+1]),1,-1)]->$column = substr(trim($matches[$j+1]),1,-1);
                    }
                }
            }
        }
        if (isset($id->cst)) {
            $contents = $id->cst->get_content();
            $rows = explode("\r\n", $contents);
            $columns = scorm_get_aicc_columns($rows[0],'block');
            $regexp = scorm_forge_cols_regexp($columns->columns,'(.+)?,');
            for ($i=1;$i<count($rows);$i++) {
                if (preg_match($regexp,$rows[$i],$matches)) {
                    for ($j=0;$j<count($columns->columns);$j++) {
                        if ($j != $columns->mastercol) {
                            $courses[$courseid]->elements[substr(trim($matches[$j+1]),1,-1)]->parent = substr(trim($matches[$columns->mastercol+1]),1,-1);
                        }
                    }
                }
            }
        }
        if (isset($id->ort)) {
            $contents = $id->ort->get_content();
            $rows = explode("\r\n", $contents);
            $columns = scorm_get_aicc_columns($rows[0],'course_element');
            $regexp = scorm_forge_cols_regexp($columns->columns,'(.+)?,');
            for ($i=1;$i<count($rows);$i++) {
                if (preg_match($regexp,$rows[$i],$matches)) {
                    for ($j=0;$j<count($matches)-1;$j++) {
                        if ($j != $columns->mastercol) {
                            $courses[$courseid]->elements[substr(trim($matches[$j+1]),1,-1)]->parent = substr(trim($matches[$columns->mastercol+1]),1,-1);
                        }
                    }
                }
            }
        }
        if (isset($id->pre)) {
            $contents = $id->pre->get_content();
            $rows = explode("\r\n", $contents);
            $columns = scorm_get_aicc_columns($rows[0],'structure_element');
            $regexp = scorm_forge_cols_regexp($columns->columns,'(.+),');
            for ($i=1;$i<count($rows);$i++) {
                if (preg_match($regexp,$rows[$i],$matches)) {
                    $courses[$courseid]->elements[$columns->mastercol+1]->prerequisites = substr(trim($matches[1-$columns->mastercol+1]),1,-1);
                }
            }
        }
        if (isset($id->cmp)) {
            $contents = $id->cmp->get_content();
            $rows = explode("\r\n", $contents);
        }
    }
    //print_r($courses);

    $oldscoes = $DB->get_records('scorm_scoes', array('scorm'=>$scorm->id));

    $launch = 0;
    if (isset($courses)) {
        foreach ($courses as $course) {
            $sco = new object();
            $sco->identifier = $course->id;
            $sco->scorm = $scorm->id;
            $sco->organization = '';
            $sco->title = $course->title;
            $sco->parent = '/';
            $sco->launch = '';
            $sco->scormtype = '';

            //print_r($sco);
            if ($ss = $DB->get_record('scorm_scoes', array('scorm'=>$scorm->id,'identifier'=>$sco->identifier))) {
                $id = $ss->id;
                $DB->update_record('scorm_scoes',$sco);
                unset($oldscoes[$id]);
            } else {
                $id = $DB->insert_record('scorm_scoes',$sco);
            }

            if ($launch == 0) {
                $launch = $id;
            }
            if (isset($course->elements)) {
                foreach($course->elements as $element) {
                    unset($sco);
                    $sco->identifier = $element->system_id;
                    $sco->scorm = $scorm->id;
                    $sco->organization = $course->id;
                    $sco->title = $element->title;

                    if (!isset($element->parent) || strtolower($element->parent) == 'root') {
                        $sco->parent = '/';
                    } else {
                        $sco->parent = $element->parent;
                    }
                    if (isset($element->file_name)) {
                        $sco->launch = $element->file_name;
                        $sco->scormtype = 'sco';
                        $sco->previous = 0;
                        $sco->next = 0;
                        $id = null;
                        if ($oldscoid = scorm_array_search('identifier',$sco->identifier,$oldscoes)) {
                            $sco->id = $oldscoid;
                            if ($DB->update_record('scorm_scoes',$sco)) {
                                $id = $oldscoid;
                            }
                            $DB->delete_records('scorm_scoes_data', array('scoid'=>$oldscoid));
                            unset($oldscoes[$oldscoid]);
                        } else {
                            $id = $DB->insert_record('scorm_scoes',$sco);
                        }
                        if (!empty($id)) {
                            unset($scodata);
                            $scodata->scoid = $id;
                            if (isset($element->web_launch)) {
                                $scodata->name = 'parameters';
                                $scodata->value = $element->web_launch;
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                            if (isset($element->prerequisites)) {
                                $scodata->name = 'prerequisites';
                                $scodata->value = $element->prerequisites;
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                            if (isset($element->max_time_allowed)) {
                                $scodata->name = 'max_time_allowed';
                                $scodata->value = $element->max_time_allowed;
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                            if (isset($element->time_limit_action)) {
                                $scodata->name = 'time_limit_action';
                                $scodata->value = $element->time_limit_action;
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                            if (isset($element->mastery_score)) {
                                $scodata->name = 'mastery_score';
                                $scodata->value = $element->mastery_score;
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                            if (isset($element->core_vendor)) {
                                $scodata->name = 'datafromlms';
                                $scodata->value = preg_replace('/<cr>/i', "\r\n", $element->core_vendor);
                                $dataid = $DB->insert_record('scorm_scoes_data',$scodata);
                            }
                        }
                        if ($launch==0) {
                            $launch = $id;
                        }
                    }
                }
            }
        }
    }
    if (!empty($oldscoes)) {
        foreach($oldscoes as $oldsco) {
            $DB->delete_records('scorm_scoes', array('id'=>$oldsco->id));
            $DB->delete_records('scorm_scoes_track', array('scoid'=>$oldsco->id));
        }
    }

    $scorm->version = 'AICC';

    $scorm->launch = $launch;

    return true;
}

function scorm_get_toc($user,$scorm,$liststyle,$currentorg='',$scoid='',$mode='normal',$attempt='',$play=false) {
    global $CFG, $DB, $PAGE, $OUTPUT;

    $strexpand = get_string('expcoll','scorm');
    $modestr = '';
    if ($mode == 'browse') {
        $modestr = '&amp;mode='.$mode;
    }

    $result = new stdClass();
    $result->toc = "<ul id='s0' class='$liststyle'>\n";
    $tocmenus = array();
    $result->prerequisites = true;
    $incomplete = false;

    //
    // Get the current organization infos
    //
    if (!empty($currentorg)) {
        if (($organizationtitle = $DB->get_field('scorm_scoes','title', array('scorm'=>$scorm->id,'identifier'=>$currentorg))) != '') {
            $result->toc .= "\t<li>$organizationtitle</li>\n";
            $tocmenus[] = $organizationtitle;
        }
    }
    //
    // If not specified retrieve the last attempt number
    //
    if (empty($attempt)) {
        $attempt = scorm_get_last_attempt($scorm->id, $user->id);
    }
    $result->attemptleft = $scorm->maxattempt - $attempt;
    if ($scoes = scorm_get_scoes($scorm->id, $currentorg)){
        //
        // Retrieve user tracking data for each learning object
        //
        $usertracks = array();
        foreach ($scoes as $sco) {
            if (!empty($sco->launch)) {
                if ($usertrack = scorm_get_tracks($sco->id,$user->id,$attempt)) {
                    if ($usertrack->status == '') {
                        $usertrack->status = 'notattempted';
                    }
                    $usertracks[$sco->identifier] = $usertrack;
                }
            }
        }

        $level=0;
        $sublist=1;
        $previd = 0;
        $nextid = 0;
        $findnext = false;
        $parents[$level]='/';

        foreach ($scoes as $pos => $sco) {
            $isvisible = false;
            $sco->title = $sco->title;
            if (!isset($sco->isvisible) || (isset($sco->isvisible) && ($sco->isvisible == 'true'))) {
                $isvisible = true;
            }
            if ($parents[$level]!=$sco->parent) {
                if ($newlevel = array_search($sco->parent,$parents)) {
                    for ($i=0; $i<($level-$newlevel); $i++) {
                        $result->toc .= "\t\t</ul></li>\n";
                    }
                    $level = $newlevel;
                } else {
                    $i = $level;
                    $closelist = '';
                    while (($i > 0) && ($parents[$level] != $sco->parent)) {
                        $closelist .= "\t\t</ul></li>\n";
                        $i--;
                    }
                    if (($i == 0) && ($sco->parent != $currentorg)) {
                        $style = '';
                        if (isset($_COOKIE['hide:SCORMitem'.$sco->id])) {
                            $style = ' style="display: none;"';
                        }
                        $result->toc .= "\t\t<li><ul id='s$sublist' class='$liststyle'$style>\n";
                        $level++;
                    } else {
                        $result->toc .= $closelist;
                        $level = $i;
                    }
                    $parents[$level]=$sco->parent;
                }
            }
            if ($isvisible) {
                $result->toc .= "\t\t<li>";
            }
            if (isset($scoes[$pos+1])) {
                $nextsco = $scoes[$pos+1];
            } else {
                $nextsco = false;
            }
            $nextisvisible = false;
            if (!isset($nextsco->isvisible) || (isset($nextsco->isvisible) && ($nextsco->isvisible == 'true'))) {
                $nextisvisible = true;
            }
            if ($nextisvisible && ($nextsco !== false) && ($sco->parent != $nextsco->parent) && (($level==0) || (($level>0) && ($nextsco->parent == $sco->identifier)))) {
                $sublist++;
                $icon = 'minus';
                if (isset($_COOKIE['hide:SCORMitem'.$nextsco->id])) {
                    $icon = 'plus';
                }
                $result->toc .= '<a href="javascript:expandCollide(\'img'.$sublist.'\',\'s'.$sublist.'\','.$nextsco->id.');"><img id="img'.$sublist.'" src="'.$OUTPUT->pix_url('pix/' . $icon, 'scorm').'" alt="'.$strexpand.'" title="'.$strexpand.'"/></a>';
            } else if ($isvisible) {
                $result->toc .= '<img src="'.$OUTPUT->pix_url('pix/spacer', 'scorm').'" alt="" />';
            }
            if (empty($sco->title)) {
                $sco->title = $sco->identifier;
            }
            if (!empty($sco->launch)) {
                if ($isvisible) {
                    $startbold = '';
                    $endbold = '';
                    $score = '';
                    if (empty($scoid) && ($mode != 'normal')) {
                        $scoid = $sco->id;
                    }
                    if (isset($usertracks[$sco->identifier])) {
                        $usertrack = $usertracks[$sco->identifier];
                        $strstatus = get_string($usertrack->status,'scorm');
                        if ($sco->scormtype == 'sco') {
                            $statusicon = '<img src="'.$OUTPUT->pix_url('pix/' . $usertrack->status, 'scorm').'" alt="'.$strstatus.'" title="'.$strstatus.'" />';
                        } else {
                            $statusicon = '<img src="'.$OUTPUT->pix_url('pix/assetc', 'scorm').'" alt="'.get_string('assetlaunched','scorm').'" title="'.get_string('assetlaunched','scorm').'" />';
                        }

                        if (($usertrack->status == 'notattempted') || ($usertrack->status == 'incomplete') || ($usertrack->status == 'browsed')) {
                            $incomplete = true;
                            if ($play && empty($scoid)) {
                                $scoid = $sco->id;
                            }
                        }
                        if ($usertrack->score_raw != '') {
                            $score = '('.get_string('score','scorm').':&nbsp;'.$usertrack->score_raw.')';
                        }
                        $strsuspended = get_string('suspended','scorm');
                        if (isset($usertrack->{'cmi.core.exit'}) && ($usertrack->{'cmi.core.exit'} == 'suspend')) {
                            $statusicon = '<img src="'.$OUTPUT->pix_url('pix/suspend', 'scorm').'" alt="'.$strstatus.' - '.$strsuspended.'" title="'.$strstatus.' - '.$strsuspended.'" />';
                        }
                    } else {
                        if ($play && empty($scoid)) {
                            $scoid = $sco->id;
                        }
                        $incomplete = true;
                        if ($sco->scormtype == 'sco') {
                            $statusicon = '<img src="'.$OUTPUT->pix_url('pix/notattempted', 'scorm').'" alt="'.get_string('notattempted','scorm').'" title="'.get_string('notattempted','scorm').'" />';
                        } else {
                            $statusicon = '<img src="'.$OUTPUT->pix_url('pix/asset', 'scorm').'" alt="'.get_string('asset','scorm').'" title="'.get_string('asset','scorm').'" />';
                        }
                    }
                    if ($sco->id == $scoid) {
                        $startbold = '<b>';
                        $endbold = '</b>';
                        $findnext = true;
                        $shownext = isset($sco->next) ? $sco->next : 0;
                        $showprev = isset($sco->previous) ? $sco->previous : 0;
                    }

                    if (($nextid == 0) && (scorm_count_launchable($scorm->id,$currentorg) > 1) && ($nextsco!==false) && (!$findnext)) {
                        if (!empty($sco->launch)) {
                            $previd = $sco->id;
                        }
                    }
                    if (empty($sco->prerequisites) || scorm_eval_prerequisites($sco->prerequisites,$usertracks)) {
                        if ($sco->id == $scoid) {
                            $result->prerequisites = true;
                        }
                        $url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&amp;currentorg='.$currentorg.$modestr.'&amp;scoid='.$sco->id;
                        $result->toc .= $statusicon.'&nbsp;'.$startbold.'<a href="'.$url.'">'.format_string($sco->title).'</a>'.$score.$endbold."</li>\n";
                        $tocmenus[$sco->id] = scorm_repeater('&minus;',$level) . '&gt;' . format_string($sco->title);
                    } else {
                        if ($sco->id == $scoid) {
                            $result->prerequisites = false;
                        }
                        $result->toc .= $statusicon.'&nbsp;'.format_string($sco->title)."</li>\n";
                    }
                }
            } else {
                $result->toc .= '&nbsp;'.format_string($sco->title)."</li>\n";
            }
            if (($nextsco !== false) && ($nextid == 0) && ($findnext)) {
                if (!empty($nextsco->launch)) {
                    $nextid = $nextsco->id;
                }
            }
        }
        for ($i=0;$i<$level;$i++) {
            $result->toc .= "\t\t</ul></li>\n";
        }

        if ($play) {
            $sco = scorm_get_sco($scoid);
            $sco->previd = $previd;
            $sco->nextid = $nextid;
            $result->sco = $sco;
            $result->incomplete = $incomplete;
        } else {
            $result->incomplete = $incomplete;
        }
    }
    $result->toc .= "\t</ul>\n";
    if ($scorm->hidetoc == 0) {
        $result->toc .= $PAGE->requires->data_for_js('scormdata', array(
                'plusicon' => $OUTPUT->pix_url('pix/plus', 'scorm'),
                'minusicon' => $OUTPUT->pix_url('pix/minus', 'scorm')))->asap();
        $result->toc .= $PAGE->requires->js('lib/cookies.js')->asap();
        $result->toc .= $PAGE->requires->js('mod/scorm/datamodels/scorm_datamodels.js')->asap();
    }

    $url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&currentorg='.$currentorg.$modestr;
    $select = html_select::make_popup_form($url, 'scoid', $tocmenus, "tocmenu", $sco->id);
    $select->nothinglabel = false;
    $result->tocmenu = $OUTPUT->select($select);

    return $result;
}