/**
* Starts a quiz by loading its first question
*
* @param \Drupal\quiz\QuizInterface $quiz
* @return array|\Symfony\Component\HttpFoundation\RedirectResponse
* Returns a redirect for the first question if questions exist
* else it returns a redirect back to quiz.
*/
public function takeQuiz(QuizInterface $quiz)
{
// Only attempt quiz if it has questions.
$attemptCount = $quiz->get('attempts')->value;
if ($attemptCount > 0) {
$statuses = $quiz->getStatuses($this->currentUser());
if (count($statuses) >= $attemptCount) {
$status = $quiz->getActiveStatus($this->currentUser());
if ($status == NULL) {
drupal_set_message($this->t('Maximum attempts for this quiz reached.'), 'warning');
return $this->redirect('entity.quiz.canonical', ['quiz' => $quiz->id()]);
}
}
}
$questions = $quiz->getQuestions();
if (count($questions) != 0) {
$status = $quiz->getActiveStatus($this->currentUser());
// If no open quiz session is found, create one.
if ($status == NULL) {
$status = UserQuizStatus::create(array());
$status->setQuiz($quiz);
$status->setFinished(0);
$status->setAnswerCount(0);
$status->save();
}
$next = 0;
$nextQuestion = NULL;
// Take questions in order mechanism. Extend here to implement random order.
foreach ($questions as $question) {
/* @var $question \Drupal\quiz\Entity\Question */
if ($status->getLastQuestionId() == NULL || $next) {
$nextQuestion = $question;
break;
}
if ($status->getLastQuestionId() == $question->id()) {
$next = 1;
}
}
// There is a question to be answered case.
if ($nextQuestion != NULL) {
$status->setCurrentQuestion($nextQuestion);
$status->save();
return $this->redirect('entity.answer.add_answer', ['question' => $nextQuestion->id()]);
} elseif ($status->isFinished() == 0) {
$status->setScore($status->evaluate());
$status->setMaxScore($quiz->getMaxScore());
$status->setPercent($quiz->get('percent')->value);
$status->setQuestionsCount(count($quiz->getQuestions()));
$status->setFinished(time());
$status->setCurrentQuestion();
$status->save();
}
return $this->redirect('entity.quiz.canonical', ['quiz' => $quiz->id()]);
}
drupal_set_message($this->t('This quiz has no questions.'), 'warning');
return $this->redirect('entity.quiz.canonical', ['quiz' => $quiz->id()]);
}
