<?php
class Page_Exams extends Page
{
var $action = false;
var $exams;
var $locations;
var $lectures;
private $currentExam;
/** if examid is set, also add a column 'selected' **/
protected function readLocations($examid = NULL)
{
if ($examid == NULL) {
$tmp = Database::simpleQuery("SELECT locationid, locationname FROM location;", []);
} else {
$tmp = Database::simpleQuery("SELECT locationid, locationname, " .
"EXISTS(SELECT * FROM exams NATURAL JOIN exams_x_location WHERE locationid = x.locationid AND examid= :examid) AS selected FROM location x", compact('examid'));
}
while ($loc = $tmp->fetch(PDO::FETCH_ASSOC)) {
$this->locations[] = $loc;
}
}
protected function readExams()
{
$tmp = Database::simpleQuery("select examid, starttime, endtime, description, GROUP_CONCAT(locationid) AS locationids, "
. "GROUP_CONCAT(locationname) AS locationnames FROM "
. "exams NATURAL LEFT JOIN exams_x_location NATURAL LEFT JOIN location GROUP BY examid", []);
while ($exam = $tmp->fetch(PDO::FETCH_ASSOC)) {
$this->exams[] = $exam;
}
}
protected function readLectures()
{
$tmp = Database::simpleQuery(
"SELECT lectureid, locationid, displayname, starttime, endtime, isenabled ".
"FROM sat.lecture NATURAL JOIN sat.lecture_x_location " .
"WHERE isexam <> 0");
while ($lecture = $tmp->fetch(PDO::FETCH_ASSOC)) {
$this->lectures[] = $lecture;
}
}
protected function makeItemsForVis()
{
$out = [];
/* foreach group also add an invisible item on top */
foreach ($this->locations as $l) {
$out[] = [ 'id' => 'spacer_' . $l['locationid'],
'group' => $l['locationid'],
'className' => 'spacer',
'start' => 0,
'content' => 'spacer',
'end' => 99999999999999,
'subgroup' => 0
];
}
$unique_ids = 1;
/* add the red shadows */
foreach ($this->exams as $e) {
foreach(explode(',', $e['locationids']) as $locationid) {
$out[] = [ 'id' => 'shadow_' . $unique_ids++,
'content' => '',
'start' => intval($e['starttime']) * 1000,
'end' => intval($e['endtime']) * 1000,
'type' => 'background',
'group' => $locationid,
];
}
}
/* add the lectures */
$i = 2;
foreach ($this->lectures as $l) {
$mark = '<span class="' . ($l['isenabled'] ? '' : 'glyphicon glyphicon-exclamation-sign') . '"></span>';
$out[] = [
'id' => $l['lectureid'] . '/' . $l['locationid'],
'content' => htmlspecialchars($l['displayname']) . $mark ,
'title' => $l['isenabled'] ? '' : Dictionary::translate('warning_lecture_is_not_enabled'),
'start' => intval($l['starttime']) * 1000,
'end' => intval($l['endtime']) * 1000,
'group' => $l['locationid'],
'className' => $l['isenabled'] ? '' : 'disabled',
'editable' => false,
'subgroup' => $i++
];
}
return json_encode($out);
}
protected function makeGroupsForVis()
{
$out = [];
foreach ($this->locations as $l) {
$out[] = [
'id' => $l['locationid'],
'content' => $l['locationname']
];
}
return json_encode($out);
}
protected function makeExamsForTemplate() {
$out = [];
foreach ($this->exams as $exam) {
$tmp = $exam;
$tmp['starttime'] = date('Y-m-d H:i', $tmp['starttime']);
$tmp['endtime'] = date('Y-m-d H:i', $tmp['endtime']);
$out[] = $tmp;
}
return $out;
}
private function dateSane($time)
{
if ($time < strtotime('-1 day'))
return false;
if ($time > strtotime('+90 day'))
return false;
return true;
}
private function saveExam()
{
if (!Request::isPost()) {
Util::traceError('Is not post');
}
/* process form-data */
$locationids = Request::post('locations', [], "ARRAY");
/* global room has id 0 */
if(empty($locationids)) {
$locationids[] = 0;
}
$examid = Request::post('examid', 0, 'int');
$starttime = strtotime(Request::post('starttime_date') . " " . Request::post('starttime_time'));
$endtime = strtotime(Request::post('endtime_date') . " " . Request::post('endtime_time'));
$description = Request::post('description');
if (!$this->dateSane($starttime)) {
Message::addError('starttime-invalid', Request::post('starttime_date') . " " . Request::post('starttime_time'));
Util::redirect('?do=exams');
}
if (!$this->dateSane($endtime)) {
Message::addError('endtime-invalid', Request::post('endtime_date') . " " . Request::post('endtime_time'));
Util::redirect('?do=exams');
}
if ($endtime <= $starttime) {
Message::addError('end-before-start');
Util::redirect('?do=exams');
}
if ($examid === 0) {
// No examid given, is add
$res = Database::exec("INSERT INTO exams(starttime, endtime, description) VALUES(:starttime, :endtime, :description);",
compact('starttime', 'endtime', 'description')) !== false;
$exam_id = Database::lastInsertId();
foreach ($locationids as $lid) {
$res = $res && Database::exec("INSERT INTO exams_x_location(examid, locationid) VALUES(:exam_id, :lid)", compact('exam_id', 'lid')) !== false;
}
if ($res === false) {
Message::addError('exam-not-added');
} else {
Message::addInfo('exam-added-success');
}
Util::redirect('?do=exams');
}
// Edit
$this->currentExam = Database::queryFirst("SELECT * FROM exams WHERE examid = :examid", array('examid' => $examid));
if ($this->currentExam === false) {
Message::addError('invalid-exam-id', $examid);
Util::redirect('?do=exams');
}
/* update fields */
$res = Database::exec("UPDATE exams SET starttime = :starttime, endtime = :endtime, description = :description WHERE examid = :examid",
compact('starttime', 'endtime', 'description', 'examid')) !== false;
/* drop all connections and reconnect to rooms */
$res = $res && Database::exec("DELETE FROM exams_x_location WHERE examid = :examid", compact('examid')) !== false;
/* reconnect */
foreach ($locationids as $lid) {
$res = $res && Database::exec("INSERT INTO exams_x_location(examid, locationid) VALUES(:examid, :lid)", compact('examid', 'lid')) !== false;
}
if ($res !== FALSE) {
Message::addInfo("changes-successfully-saved");
} else {
Message::addError("error-while-saving-changes");
}
Util::redirect('?do=exams');
}
protected function doPreprocess()
{
User::load();
$req_action = Request::any('action', 'show');
if (in_array($req_action, ['show', 'add', 'delete', 'edit', 'save'])) {
$this->action = $req_action;
}
if ($this->action === 'show') {
$this->readExams();
$this->readLocations();
$this->readLectures();
} elseif ($this->action === 'edit') {
$examid = Request::get('examid', 0, 'int');
$this->currentExam = Database::queryFirst("SELECT * FROM exams WHERE examid = :examid", array('examid' => $examid));
if ($this->currentExam === false) {
Message::addError('invalid-exam-id', $examid);
Util::redirect('?do=exams');
}
$this->readLocations($examid);
} elseif ($this->action === 'save') {
$this->saveExam();
} elseif ($this->action === 'delete') {
if (!Request::isPost()) { die('delete only works with a post request'); }
$examid = Request::post('examid');
$res = Database::exec("DELETE FROM exams WHERE examid = :examid;", compact('examid'));
$res = Database::exec("DELETE FROM exams_x_location WHERE examid = :examid;", compact('examid'));
if ($res === false) {
Message::addError('exam-not-deleted-error');
} else {
Message::addInfo('exam-deleted-success');
}
Util::redirect('?do=exams');
} elseif ($this->action === false) {
Util::traceError("action not implemented");
}
}
protected function doRender()
{
if ($this->action === "show") {
Render::setTitle("All Exams");
Render::addTemplate('page-exams',
[ 'exams' => $this->makeExamsForTemplate(),
'exams_json' => $this->makeItemsForVis(),
'rooms_json' => $this->makeGroupsForVis(),
'vis_begin' => strtotime('-5 minute') * 1000,
'vis_end' => strtotime('+2 day') * 1000,
'vis_min_date' => strtotime('-1 day') * 1000,
'vis_max_date' => strtotime('+3 month') * 1000
]);
} elseif ($this->action === "add") {
Render::setTitle(Dictionary::translate('title_add-exam'));
$this->readLocations();
Render::addTemplate('page-add-edit-exam', ['locations' => $this->locations]);
} elseif ($this->action === 'edit') {
Render::setTitle(Dictionary::translate('title_edit-exam'));
$exam = [
'examid' => $this->currentExam['examid'],
'starttime_date' => date('Y-m-d', $this->currentExam['starttime']),
'starttime_time' => date('H:i', $this->currentExam['starttime']),
'endtime_date' => date('Y-m-d', $this->currentExam['endtime']),
'endtime_time' => date('H:i', $this->currentExam['endtime']),
'description' => $this->currentExam['description']
];
Render::addTemplate('page-add-edit-exam', ['exam' => $exam, 'locations' => $this->locations]);
}
}
}
