/**
* This action is the quiz shell.
* It ensures permissions, creates new attempts etc etc.
*
* @author Ben Evans
*/
public function attemptAction()
{
Model_Shell_Debug::getInstance()->log("User Entered the Attempt Action");
$identity = Zend_Auth::getInstance()->getIdentity();
$username = $identity->username;
$auth_model = Model_Auth_General::getAuthModel();
/* Before we do anything, test to make sure we've passed a VALID QUIZ which WE ARE ENTITLED to sit. */
$quiz_id = $this->_getParam("quiz");
if (is_null($quiz_id)) {
throw new Exception("No quiz was passed. Cannot continue.");
}
$vQuiz = Model_Quiz_Quiz::fromID($quiz_id);
if ($vQuiz == null) {
throw new Exception("Quiz ID passed was invalid. Cannot continue.");
}
$mFinished = false;
$mMarking = false;
//Permissions
if ($auth_model->userInGroup($username, $vQuiz->getPermissions_group()) && $vQuiz->getOpen_date() <= strtotime("now")) {
//Have we run out of attempts?
$vAttempts = Model_Quiz_QuizAttempt::getAllFromUser($username, $vQuiz);
if (sizeof($vAttempts) >= $vQuiz->getMax_attempts()) {
//It is possible that we're on our last attempt, and that it's "in progress"...check
$bInProgress = false;
foreach ($vAttempts as $vAttempt) {
if ($vAttempt->getDate_finished() == null) {
$bInProgress = true;
}
}
if (!$bInProgress) {
throw new Exception("You've exceeded your maximum attempts for this quiz. Cannot continue");
}
}
} else {
if (!$this->view->is_admin) {
throw new Exception("Insufficient Permissions to take this quiz / Quiz not open yet");
}
$vAttempts = Model_Quiz_QuizAttempt::getAllFromUser($username, $vQuiz);
}
/* Ok. We're allowed to TAKE the quiz. Are we resuming, or starting a new one? */
$mQuizAttempt = null;
if (is_array($vAttempts)) {
foreach ($vAttempts as $vAttempt) {
if ($vAttempt->getDate_finished() == null) {
$mQuizAttempt = $vAttempt;
break;
}
}
//End Foreach
}
//End If
if ($mQuizAttempt == null) {
$mQuizAttempt = Model_Quiz_QuizAttempt::fromScratch(strtotime("now"), $vQuiz, $username);
}
/* Calculate the total questions needed for this quiz */
$vTCs = $vQuiz->getTestedConcepts();
$vTotalQuestions = 0;
foreach ($vTCs as $vTC) {
$vTotalQuestions = $vTotalQuestions + $vTC->getNumber_tested();
}
/* We have our quizAttempt ready to go. Now we look to see if we're resuming a question or not */
$mQuestionAttempt = $mQuizAttempt->getLastIncompleteQuestion();
if (is_object($mQuestionAttempt) && !$mQuestionAttempt->isValid()) {
$mQuestionAttempt->destroy();
// Remove the Question attempt (Database was reinitialised or something)
$mQuestionAttempt = null;
}
if ($mQuestionAttempt != null) {
/* Are we getting an ANSWER for this question? */
if (array_key_exists("marking", $_POST) && $_POST['marking'] == "1") {
/* Mark it */
$mMarking = true;
}
/* If we reach here, the page has probably been refreshed. We just re-display the last question */
} else {
/* Have we finished this quiz? */
if ($mQuizAttempt->getQuestionAttemptCount() >= $vTotalQuestions) {
//Close this attempt and display a result later on down the page
$mQuizAttempt->setDate_finished(strtotime("now"));
//Calculate and store the final score
$mQuizAttempt->setTotal_score($mQuizAttempt->getTotal_score());
$mFinished = true;
} else {
/* QuizAttempt isn't finished... Fetch a questionBase */
$vQuestionBase = Model_Shell_QuestionChooser::select_next_question($mQuizAttempt, true);
/* Make a GeneratedQuestion */
$vCounter = 0;
//Make sure we don't get any fluke no-text answers
while ($vCounter < 3) {
Model_Shell_Debug::getInstance()->log("vQuestionBase: " . isset($vQuestionBase));
Model_Shell_Debug::getInstance()->log("Generating... from " . $vQuestionBase->getXml());
$vGen = Model_Quiz_GeneratedQuestion::fromQuestionBase($vQuestionBase);
if ($vGen->getCorrect_answer() != "" && $vGen->getCorrect_answer() != "\r\n") {
break;
} else {
$vGen->remove();
}
$vCounter++;
}
if ($vGen->getCorrect_answer() == "" || $vGen->getCorrect_answer() == "\r\n") {
throw new Exception("Error. While generating a question for you, blank answers appeared > 3 times. This should never happen. Either try to refresh this page, or consult your lecturer...");
}
/* Make a QuestionAttempt */
$mQuestionAttempt = Model_Quiz_QuestionAttempt::fromScratch($vQuestionBase, strtotime("now"), strtotime("now"), $mQuizAttempt, $vGen);
}
//End-if_finished_quizAttempt
}
// Pass all relevant information to the view
$this->view->quiz = $vQuiz;
$this->view->question_attempt = $mQuestionAttempt;
$this->view->finished = $mFinished;
$this->view->marking = $mMarking;
$this->view->mQuizAttempt = $mQuizAttempt;
$this->view->vTotalQuestions = $vTotalQuestions;
}
protected function makeQuestionAttempt($quizAttempt, $now)
{
$questionBase = Model_Shell_QuestionChooser::select_next_question($quizAttempt, true);
$path = $this->getFrontController()->getParam('xml_path');
// This way we can set it externally from our tests. If not set, called code will just use the configuration value
/* Make a GeneratedQuestion */
$cnt = 0;
// Make sure we don't get any fluke no-text answers
while ($cnt < 3) {
Model_Shell_Debug::getInstance()->log("vQuestionBase: " . isset($questionBase));
Model_Shell_Debug::getInstance()->log("Generating... from " . $questionBase->getXml());
$vGen = Model_Quiz_GeneratedQuestion::fromQuestionBase($questionBase, $path);
if ($vGen->getCorrect_answer() != "" && $vGen->getCorrect_answer() != "\r\n") {
break;
} else {
$vGen->remove();
}
$cnt++;
}
if ($vGen->getCorrect_answer() == "" || $vGen->getCorrect_answer() == "\r\n") {
throw new Exception("Error. While generating a question for you, blank answers appeared > 3 times. This should never happen. Either try to refresh this page, or consult your lecturer...");
}
/* Make a QuestionAttempt */
return Model_Quiz_QuestionAttempt::fromScratch($questionBase, $now, $now, $quizAttempt, $vGen);
}
