/**
* Handles the incoming request
*
*/
public function handle_request()
{
global $USER;
switch ($this->action) {
case 'startquiz':
// only allow instructors to perform this action
if ($this->RTQ->is_instructor()) {
$firstquestion = $this->session->start_quiz();
$this->jsonlib->set('status', 'startedquiz');
$this->jsonlib->set('questionid', $firstquestion->get_slot());
$this->jsonlib->set('nextstarttime', $this->session->get_session()->nextstarttime);
$this->jsonlib->set('notime', $firstquestion->getNoTime());
if ($firstquestion->getNoTime() == 0) {
// this question has a time limit
if ($firstquestion->getQuestionTime() == 0) {
$questiontime = $this->RTQ->getRTQ()->defaultquestiontime;
} else {
$questiontime = $firstquestion->getQuestionTime();
}
$this->jsonlib->set('questiontime', $questiontime);
} else {
$this->jsonlib->set('questiontime', 0);
}
$delay = $this->session->get_session()->nextstarttime - time();
$this->jsonlib->set('delay', $delay);
$qattempt = $this->session->get_open_attempt();
$this->jsonlib->set('lastquestion', $qattempt->lastquestion ? 'true' : 'false');
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'savequestion':
// check if we're working on the current question for the session
$currentquestion = $this->session->get_session()->currentquestion;
$jscurrentquestion = required_param('questionid', PARAM_INT);
if ($currentquestion != $jscurrentquestion) {
$this->jsonlib->send_error('invalid question');
}
// if we pass attempt to save the question
$qattempt = $this->session->get_open_attempt();
// make sure the attempt belongs to the current user
if ($qattempt->userid != $USER->id) {
$this->jsonlib->send_error('invalid user');
}
if ($qattempt->save_question()) {
$this->jsonlib->set('status', 'success');
$this->jsonlib->set('feedback', $qattempt->get_question_feedback());
// next we need to send back the updated sequence check for javascript to update
// the sequence check on the question form. this allows the question to be resubmitted again
list($seqname, $seqvalue) = $qattempt->get_sequence_check($this->session->get_session()->currentqnum);
$this->jsonlib->set('seqcheckname', $seqname);
$this->jsonlib->set('seqcheckval', $seqvalue);
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('unable to save question');
}
break;
case 'getresults':
// only allow instructors to perform this action
if ($this->RTQ->is_instructor()) {
$this->session->set_status('reviewing');
// get the current question results
$responses = $this->session->get_question_results();
$this->jsonlib->set('responses', $responses);
$this->jsonlib->set('status', 'success');
$this->jsonlib->set('qtype', $this->RTQ->get_questionmanager()->get_questiontype_byqnum($this->session->get_session()->currentqnum));
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'getcurrentresults':
// case to get the results of the question currently going
if ($this->RTQ->is_instructor()) {
$responses = $this->session->get_question_results();
$this->jsonlib->set('responses', $responses);
$this->jsonlib->set('status', 'success');
$this->jsonlib->set('qtype', $this->RTQ->get_questionmanager()->get_questiontype_byqnum($this->session->get_session()->currentqnum));
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'getnotresponded':
// only allow instructors to perform this action
if ($this->RTQ->is_instructor()) {
$notrespondedHTML = $this->session->get_not_responded();
$this->jsonlib->set('notresponded', $notrespondedHTML);
$this->jsonlib->set('status', 'success');
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'nextquestion':
// only allow instructors to perform this action
if ($this->RTQ->is_instructor()) {
$nextquestion = $this->session->next_question();
$this->session->set_status('running');
$this->jsonlib->set('status', 'startedquestion');
$qattempt = $this->session->get_open_attempt();
$this->jsonlib->set('lastquestion', $qattempt->lastquestion ? 'true' : 'false');
$this->jsonlib->set('questionid', $nextquestion->get_slot());
$this->jsonlib->set('nextstarttime', $this->session->get_session()->nextstarttime);
$this->jsonlib->set('notime', $nextquestion->getNoTime());
if ($nextquestion->getNoTime() == 0) {
// this question has a time limit
if ($nextquestion->getQuestionTime() == 0) {
$questiontime = $this->RTQ->getRTQ()->defaultquestiontime;
} else {
$questiontime = $nextquestion->getQuestionTime();
}
$this->jsonlib->set('questiontime', $questiontime);
} else {
$this->jsonlib->set('questiontime', 0);
}
$delay = $this->session->get_session()->nextstarttime - time();
$this->jsonlib->set('delay', $delay);
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'repollquestion':
if ($this->RTQ->is_instructor()) {
$repollquestion = $this->session->repoll_question();
$this->session->set_status('running');
$this->jsonlib->set('status', 'startedquestion');
$qattempt = $this->session->get_open_attempt();
$this->jsonlib->set('lastquestion', $qattempt->lastquestion ? 'true' : 'false');
$this->jsonlib->set('questionid', $repollquestion->get_slot());
$this->jsonlib->set('nextstarttime', $this->session->get_session()->nextstarttime);
$this->jsonlib->set('notime', $repollquestion->getNoTime());
if ($repollquestion->getNoTime() == 0) {
// this question has a time limit
if ($repollquestion->getQuestionTime() == 0) {
$questiontime = $this->RTQ->getRTQ()->defaultquestiontime;
} else {
$questiontime = $repollquestion->getQuestionTime();
}
$this->jsonlib->set('questiontime', $questiontime);
} else {
$this->jsonlib->set('questiontime', 0);
}
$delay = $this->session->get_session()->nextstarttime - time();
$this->jsonlib->set('delay', $delay);
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'gotoquestion':
if ($this->RTQ->is_instructor()) {
$qnum = optional_param('qnum', '', PARAM_INT);
if (empty($qnum)) {
$this->jsonlib->send_error('invalid question number');
}
if (!($question = $this->session->goto_question($qnum))) {
$this->jsonlib->send_error('invalid question number');
}
$this->session->set_status('running');
$this->jsonlib->set('status', 'startedquestion');
$qattempt = $this->session->get_open_attempt();
$this->jsonlib->set('lastquestion', $qattempt->lastquestion ? 'true' : 'false');
$this->jsonlib->set('questionid', $question->get_slot());
$this->jsonlib->set('nextstarttime', $this->session->get_session()->nextstarttime);
$this->jsonlib->set('notime', $question->getNoTime());
if ($question->getNoTime() == 0) {
// this question has a time limit
if ($question->getQuestionTime() == 0) {
$questiontime = $this->RTQ->getRTQ()->defaultquestiontime;
} else {
$questiontime = $question->getQuestionTime();
}
$this->jsonlib->set('questiontime', $questiontime);
} else {
$this->jsonlib->set('questiontime', 0);
}
$delay = $this->session->get_session()->nextstarttime - time();
$this->jsonlib->set('delay', $delay);
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'endquestion':
// update the session status to say that we're ending the question (this will in turn update students
if ($this->RTQ->is_instructor()) {
$this->session->end_question();
$this->jsonlib->set('status', 'success');
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'getrightresponse':
if ($this->RTQ->is_instructor()) {
$rightresponsequestion = $this->session->get_question_right_response();
$this->jsonlib->set('rightanswer', $rightresponsequestion);
$this->jsonlib->set('status', 'success');
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
case 'closesession':
// only allow instructors to perform this action
if ($this->RTQ->is_instructor()) {
$this->session->end_session();
// next calculate and save grades
if (!$this->RTQ->get_grader()->save_all_grades()) {
$this->jsonlib->send_error('can\'t save grades');
}
$this->jsonlib->set('status', 'success');
$this->jsonlib->send_response();
} else {
$this->jsonlib->send_error('invalidaction');
}
break;
default:
$this->jsonlib->send_error('invalidaction');
break;
}
}
