class.assSingleChoiceGUI.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once './Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilGuiQuestionScoringAdjustable.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilGuiAnswerScoringAdjustable.php';
require_once './Modules/Test/classes/inc.AssessmentConstants.php';

class assSingleChoiceGUI extends assQuestionGUI implements ilGuiQuestionScoringAdjustable, ilGuiAnswerScoringAdjustable
{
    public function __construct($id = -1)
    {
        parent::__construct();
        include_once "./Modules/TestQuestionPool/classes/class.assSingleChoice.php";
        $this->object = new assSingleChoice();
        if ($id >= 0) {
            $this->object->loadFromDb($id);
        }
    }

    protected function writePostData($always = false)
    {
        $hasErrors = (!$always) ? $this->editQuestion(true) : false;
        if (!$hasErrors) {
            require_once 'Services/Form/classes/class.ilPropertyFormGUI.php';
            $this->writeQuestionGenericPostData();
            $this->writeQuestionSpecificPostData(new ilPropertyFormGUI());
            $this->writeAnswerSpecificPostData(new ilPropertyFormGUI());
            $this->saveTaxonomyAssignments();
            return 0;
        }
        return 1;
    }

    protected function getEditAnswersSingleLine($checkonly = false)
    {
        if ($checkonly) {
            // form posting is checked
            return ($_POST['types'] == 0) ? true : false;
        }

        $lastChange = $this->object->getLastChange();
        if (empty($lastChange) && !isset($_POST['types'])) {
            // a new question is edited
            return $this->object->getMultilineAnswerSetting() ? false : true;
        } else {
            // a saved question is edited
            return $this->object->isSingleline;
        }
    }

    public function editQuestion($checkonly = false)
    {
        $save = $this->isSaveCommand();
        $this->getQuestionTemplate();

        include_once("./Services/Form/classes/class.ilPropertyFormGUI.php");
        $form = new ilPropertyFormGUI();
        $this->editForm = $form;

        $form->setFormAction($this->ctrl->getFormAction($this));
        $form->setTitle($this->outQuestionType());
        $isSingleline = $this->getEditAnswersSingleLine($checkonly);
        if ($isSingleline) {
            $form->setMultipart(true);
        } else {
            $form->setMultipart(false);
        }
        $form->setTableWidth("100%");
        $form->setId("asssinglechoice");

        $this->addBasicQuestionFormProperties($form);
        $this->populateQuestionSpecificFormPart($form);
        $this->populateAnswerSpecificFormPart($form);


        $this->populateTaxonomyFormSection($form);
        
        $this->addQuestionFormCommandButtons($form);
        
        $errors = false;
    
        if ($save) {
            $form->setValuesByPost();
            $errors = !$form->checkInput();
            $form->setValuesByPost(); // again, because checkInput now performs the whole stripSlashes handling and we need this if we don't want to have duplication of backslashes
            if ($errors) {
                $checkonly = false;
            }
        }

        if (!$checkonly) {
            $this->tpl->setVariable("QUESTION_DATA", $form->getHTML());
        }
        return $errors;
    }

    public function uploadchoice()
    {
        $this->writePostData(true);
        $position = key($_POST['cmd']['uploadchoice']);
        $this->editQuestion();
    }

    public function removeimagechoice()
    {
        $this->writePostData(true);
        $position = key($_POST['cmd']['removeimagechoice']);
        $filename = $_POST['choice']['imagename'][$position];
        $this->object->removeAnswerImage($position);
        $this->editQuestion();
    }

    public function addchoice()
    {
        $this->writePostData(true);
        $position = key($_POST['cmd']['addchoice']);
        $this->object->addAnswer("", 0, $position+1);
        $this->editQuestion();
    }

    public function removechoice()
    {
        $this->writePostData(true);
        $position = key($_POST['cmd']['removechoice']);
        $this->object->deleteAnswer($position);
        $this->editQuestion();
    }

    public function getSolutionOutput(
        $active_id,
        $pass = null,
        $graphicalOutput = false,
        $result_output = false,
        $show_question_only = true,
        $show_feedback = false,
        $show_correct_solution = false,
        $show_manual_scoring = false,
        $show_question_text = true
    ) {
        // shuffle output
        $keys = $this->getChoiceKeys();

        // get the solution of the user for the active pass or from the last pass if allowed
        $user_solution = "";
        if (($active_id > 0) && (!$show_correct_solution)) {
            $solutions =&$this->object->getSolutionValues($active_id, $pass);
            foreach ($solutions as $idx => $solution_value) {
                $user_solution = $solution_value["value1"];
            }
        } else {
            $found_index = -1;
            $max_points = 0;
            foreach ($this->object->answers as $index => $answer) {
                if ($answer->getPoints() > $max_points) {
                    $max_points = $answer->getPoints();
                    $found_index = $index;
                }
            }
            $user_solution = $found_index;
        }
        // generate the question output
        include_once "./Services/UICore/classes/class.ilTemplate.php";
        $template = new ilTemplate("tpl.il_as_qpl_mc_sr_output_solution.html", true, true, "Modules/TestQuestionPool");
        $solutiontemplate = new ilTemplate("tpl.il_as_tst_solution_output.html", true, true, "Modules/TestQuestionPool");
        foreach ($keys as $answer_id) {
            $answer = $this->object->answers[$answer_id];
            if (($active_id > 0) && (!$show_correct_solution)) {
                if ($graphicalOutput) {
                    // output of ok/not ok icons for user entered solutions
                    $ok = false;
                    if (strcmp($user_solution, $answer_id) == 0) {
                        if ($answer->getPoints() == $this->object->getMaximumPoints()) {
                            $ok = true;
                        } else {
                            $ok = false;
                        }
                        if ($ok) {
                            $template->setCurrentBlock("icon_ok");
                            $template->setVariable("ICON_OK", ilUtil::getImagePath("icon_ok.svg"));
                            $template->setVariable("TEXT_OK", $this->lng->txt("answer_is_right"));
                            $template->parseCurrentBlock();
                        } else {
                            $template->setCurrentBlock("icon_not_ok");
                            if ($answer->getPoints() > 0) {
                                $template->setVariable("ICON_NOT_OK", ilUtil::getImagePath("icon_mostly_ok.svg"));
                                $template->setVariable("TEXT_NOT_OK", $this->lng->txt("answer_is_not_correct_but_positive"));
                            } else {
                                $template->setVariable("ICON_NOT_OK", ilUtil::getImagePath("icon_not_ok.svg"));
                                $template->setVariable("TEXT_NOT_OK", $this->lng->txt("answer_is_wrong"));
                            }
                            $template->parseCurrentBlock();
                        }
                    }
                    if (strlen($user_solution) == 0) {
                        $template->setCurrentBlock("icon_not_ok");
                        $template->setVariable("ICON_NOT_OK", ilUtil::getImagePath("icon_not_ok.svg"));
                        $template->setVariable("TEXT_NOT_OK", $this->lng->txt("answer_is_wrong"));
                        $template->parseCurrentBlock();
                    }
                }
            }
            if (strlen($answer->getImage())) {
                $template->setCurrentBlock("answer_image");
                if ($this->object->getThumbSize()) {
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $this->object->getThumbPrefix() . $answer->getImage());
                } else {
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $answer->getImage());
                }
                $alt = $answer->getImage();
                if (strlen($answer->getAnswertext())) {
                    $alt = $answer->getAnswertext();
                }
                $alt = preg_replace("/<[^>]*?>/", "", $alt);
                $template->setVariable("ANSWER_IMAGE_ALT", ilUtil::prepareFormOutput($alt));
                $template->setVariable("ANSWER_IMAGE_TITLE", ilUtil::prepareFormOutput($alt));
                $template->parseCurrentBlock();
            }
            if ($show_feedback) {
                $this->populateInlineFeedback($template, $answer_id, $user_solution);
            }
            $template->setCurrentBlock("answer_row");
            $template->setVariable("ANSWER_TEXT", $this->object->prepareTextareaOutput($answer->getAnswertext(), true));
            
            if ($this->renderPurposeSupportsFormHtml() || $this->isRenderPurposePrintPdf()) {
                if (strcmp($user_solution, $answer_id) == 0) {
                    $template->setVariable("SOLUTION_IMAGE", ilUtil::getHtmlPath(ilUtil::getImagePath("radiobutton_checked.png")));
                    $template->setVariable("SOLUTION_ALT", $this->lng->txt("checked"));
                } else {
                    $template->setVariable("SOLUTION_IMAGE", ilUtil::getHtmlPath(ilUtil::getImagePath("radiobutton_unchecked.png")));
                    $template->setVariable("SOLUTION_ALT", $this->lng->txt("unchecked"));
                }
            } else {
                $template->setVariable('QID', $this->object->getId());
                $template->setVariable('SUFFIX', $show_correct_solution ? 'bestsolution' : 'usersolution');
                $template->setVariable('SOLUTION_VALUE', $answer_id);
                if (strcmp($user_solution, $answer_id) == 0) {
                    $template->setVariable('SOLUTION_CHECKED', 'checked');
                }
            }
            
            if ($result_output) {
                $points = $this->object->answers[$answer_id]->getPoints();
                $resulttext = ($points == 1) ? "(%s " . $this->lng->txt("point") . ")" : "(%s " . $this->lng->txt("points") . ")";
                $template->setVariable("RESULT_OUTPUT", sprintf($resulttext, $points));
            }
            $template->parseCurrentBlock();
        }
        $questiontext = $this->object->getQuestion();
        if ($show_question_text==true) {
            $template->setVariable("QUESTIONTEXT", $this->object->prepareTextareaOutput($questiontext, true));
        }
        $questionoutput = $template->get();
        $feedback = ($show_feedback && !$this->isTestPresentationContext()) ? $this->getAnswerFeedbackOutput($active_id, $pass) : "";
        if (strlen($feedback)) {
            $cssClass = (
                $this->hasCorrectSolution($active_id, $pass) ?
                ilAssQuestionFeedback::CSS_CLASS_FEEDBACK_CORRECT : ilAssQuestionFeedback::CSS_CLASS_FEEDBACK_WRONG
            );
            
            $solutiontemplate->setVariable("ILC_FB_CSS_CLASS", $cssClass);
            $solutiontemplate->setVariable("FEEDBACK", $this->object->prepareTextareaOutput($feedback, true));
        }
        $solutiontemplate->setVariable("SOLUTION_OUTPUT", $questionoutput);

        $solutionoutput = $solutiontemplate->get();
        if (!$show_question_only) {
            // get page object output
            $solutionoutput = $this->getILIASPage($solutionoutput);
        }
        return $solutionoutput;
    }
    
    public function getPreview($show_question_only = false, $showInlineFeedback = false)
    {
        $keys = $this->getChoiceKeys();
        
        // generate the question output
        include_once "./Services/UICore/classes/class.ilTemplate.php";
        $template = new ilTemplate("tpl.il_as_qpl_mc_sr_output.html", true, true, "Modules/TestQuestionPool");
        foreach ($keys as $answer_id) {
            $answer = $this->object->answers[$answer_id];
            if (strlen($answer->getImage())) {
                if ($this->object->getThumbSize()) {
                    $template->setCurrentBlock("preview");
                    $template->setVariable("URL_PREVIEW", $this->object->getImagePathWeb() . $answer->getImage());
                    $template->setVariable("TEXT_PREVIEW", $this->lng->txt('preview'));
                    $template->setVariable("IMG_PREVIEW", ilUtil::getImagePath('enlarge.svg'));
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $this->object->getThumbPrefix() . $answer->getImage());
                    list($width, $height, $type, $attr) = getimagesize($this->object->getImagePath() . $answer->getImage());
                    $alt = $answer->getImage();
                    if (strlen($answer->getAnswertext())) {
                        $alt = $answer->getAnswertext();
                    }
                    $alt = preg_replace("/<[^>]*?>/", "", $alt);
                    $template->setVariable("ANSWER_IMAGE_ALT", ilUtil::prepareFormOutput($alt));
                    $template->setVariable("ANSWER_IMAGE_TITLE", ilUtil::prepareFormOutput($alt));
                    $template->parseCurrentBlock();
                } else {
                    $template->setCurrentBlock("answer_image");
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $answer->getImage());
                    list($width, $height, $type, $attr) = getimagesize($this->object->getImagePath() . $answer->getImage());
                    $alt = $answer->getImage();
                    if (strlen($answer->getAnswertext())) {
                        $alt = $answer->getAnswertext();
                    }
                    $alt = preg_replace("/<[^>]*?>/", "", $alt);
                    $template->setVariable("ATTR", $attr);
                    $template->setVariable("ANSWER_IMAGE_ALT", ilUtil::prepareFormOutput($alt));
                    $template->setVariable("ANSWER_IMAGE_TITLE", ilUtil::prepareFormOutput($alt));
                    $template->parseCurrentBlock();
                }
            }
            if ($showInlineFeedback && is_object($this->getPreviewSession())) {
                $this->populateInlineFeedback($template, $answer_id, $this->getPreviewSession()->getParticipantsSolution());
            }
            $template->setCurrentBlock("answer_row");
            $template->setVariable("QID", $this->object->getId() . 'ID');
            $template->setVariable("ANSWER_ID", $answer_id);
            $template->setVariable("ANSWER_TEXT", $this->object->prepareTextareaOutput($answer->getAnswertext(), true));
            
            if (is_object($this->getPreviewSession())) {
                $user_solution = $this->getPreviewSession()->getParticipantsSolution();
                if (strcmp($user_solution, $answer_id) == 0) {
                    $template->setVariable("CHECKED_ANSWER", " checked=\"checked\"");
                }
            }
            
            $template->parseCurrentBlock();
        }
        $questiontext = $this->object->getQuestion();
        $template->setVariable("QUESTIONTEXT", $this->object->prepareTextareaOutput($questiontext, true));
        $questionoutput = $template->get();
        if (!$show_question_only) {
            // get page object output
            $questionoutput = $this->getILIASPage($questionoutput);
        }
        return $questionoutput;
    }
    
    // hey: prevPassSolutions - pass will be always available from now on
    public function getTestOutput($active_id, $pass, $is_postponed = false, $use_post_solutions = false, $show_feedback = false)
    // hey.
    {
        $keys = $this->getChoiceKeys();

        // get the solution of the user for the active pass or from the last pass if allowed
        $user_solution = "";
        if ($active_id) {
            // hey: prevPassSolutions - obsolete due to central check
            #$solutions = NULL;
            #include_once "./Modules/Test/classes/class.ilObjTest.php";
            #if (!ilObjTest::_getUsePreviousAnswers($active_id, true))
            #{
            #   if (is_null($pass)) $pass = ilObjTest::_getPass($active_id);
            #}
            // hey.
            $solutions = $this->object->getTestOutputSolutions($active_id, $pass);
            foreach ($solutions as $idx => $solution_value) {
                $user_solution = $solution_value["value1"];
            }
        }
        
        // generate the question output
        include_once "./Services/UICore/classes/class.ilTemplate.php";
        $template = new ilTemplate("tpl.il_as_qpl_mc_sr_output.html", true, true, "Modules/TestQuestionPool");
        foreach ($keys as $answer_id) {
            $answer = $this->object->answers[$answer_id];
            if (strlen($answer->getImage())) {
                if ($this->object->getThumbSize()) {
                    $template->setCurrentBlock("preview");
                    $template->setVariable("URL_PREVIEW", $this->object->getImagePathWeb() . $answer->getImage());
                    $template->setVariable("TEXT_PREVIEW", $this->lng->txt('preview'));
                    $template->setVariable("IMG_PREVIEW", ilUtil::getImagePath('enlarge.svg'));
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $this->object->getThumbPrefix() . $answer->getImage());
                    list($width, $height, $type, $attr) = getimagesize($this->object->getImagePath() . $answer->getImage());
                    $alt = $answer->getImage();
                    if (strlen($answer->getAnswertext())) {
                        $alt = $answer->getAnswertext();
                    }
                    $alt = preg_replace("/<[^>]*?>/", "", $alt);
                    $template->setVariable("ANSWER_IMAGE_ALT", ilUtil::prepareFormOutput($alt));
                    $template->setVariable("ANSWER_IMAGE_TITLE", ilUtil::prepareFormOutput($alt));
                    $template->parseCurrentBlock();
                } else {
                    $template->setCurrentBlock("answer_image");
                    $template->setVariable("ANSWER_IMAGE_URL", $this->object->getImagePathWeb() . $answer->getImage());
                    list($width, $height, $type, $attr) = getimagesize($this->object->getImagePath() . $answer->getImage());
                    $alt = $answer->getImage();
                    if (strlen($answer->getAnswertext())) {
                        $alt = $answer->getAnswertext();
                    }
                    $alt = preg_replace("/<[^>]*?>/", "", $alt);
                    $template->setVariable("ATTR", $attr);
                    $template->setVariable("ANSWER_IMAGE_ALT", ilUtil::prepareFormOutput($alt));
                    $template->setVariable("ANSWER_IMAGE_TITLE", ilUtil::prepareFormOutput($alt));
                    $template->parseCurrentBlock();
                }
            }
            if ($show_feedback) {
                $feedbackOutputRequired = false;

                switch ($this->object->getSpecificFeedbackSetting()) {
                    case 1:
                        $feedbackOutputRequired = true;
                        break;

                    case 2:
                        if (strcmp($user_solution, $answer_id) == 0) {
                            $feedbackOutputRequired = true;
                        }
                        break;

                    case 3:
                        if ($this->object->getAnswer($answer_id)->getPoints() > 0) {
                            $feedbackOutputRequired = true;
                        }
                        break;
                }

                if ($feedbackOutputRequired) {
                    $fb = $this->object->feedbackOBJ->getSpecificAnswerFeedbackTestPresentation(
                        $this->object->getId(),
                        $answer_id
                    );
                    if (strlen($fb)) {
                        $template->setCurrentBlock("feedback");
                        $template->setVariable("FEEDBACK", $this->object->prepareTextareaOutput($fb, true));
                        $template->parseCurrentBlock();
                    }
                }
            }
            $template->setCurrentBlock("answer_row");
            $template->setVariable("ANSWER_ID", $answer_id);
            $template->setVariable("ANSWER_TEXT", $this->object->prepareTextareaOutput($answer->getAnswertext(), true));
            if (strcmp($user_solution, $answer_id) == 0) {
                $template->setVariable("CHECKED_ANSWER", " checked=\"checked\"");
            }
            $template->parseCurrentBlock();
        }
        $questiontext = $this->object->getQuestion();
        $template->setVariable("QUESTIONTEXT", $this->object->prepareTextareaOutput($questiontext, true));
        $questionoutput = $template->get();
        $pageoutput = $this->outQuestionPage("", $is_postponed, $active_id, $questionoutput);
        return $pageoutput;
    }

    public function setQuestionTabs()
    {
        global $rbacsystem, $ilTabs;

        $ilTabs->clearTargets();
        
        $this->ctrl->setParameterByClass("ilAssQuestionPageGUI", "q_id", $_GET["q_id"]);
        include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
        $q_type = $this->object->getQuestionType();

        if (strlen($q_type)) {
            $classname = $q_type . "GUI";
            $this->ctrl->setParameterByClass(strtolower($classname), "sel_question_types", $q_type);
            $this->ctrl->setParameterByClass(strtolower($classname), "q_id", $_GET["q_id"]);
        }

        if ($_GET["q_id"]) {
            if ($rbacsystem->checkAccess('write', $_GET["ref_id"])) {
                // edit page
                $ilTabs->addTarget(
                    "edit_page",
                    $this->ctrl->getLinkTargetByClass("ilAssQuestionPageGUI", "edit"),
                    array("edit", "insert", "exec_pg"),
                    "",
                    "",
                    $force_active
                );
            }

            $this->addTab_QuestionPreview($ilTabs);
        }

        $force_active = false;
        if ($rbacsystem->checkAccess('write', $_GET["ref_id"])) {
            $url = "";
            if ($classname) {
                $url = $this->ctrl->getLinkTargetByClass($classname, "editQuestion");
            }
            // edit question properties
            $ilTabs->addTarget(
                "edit_question",
                $url,
                array("editQuestion", "save", "saveEdit", "addchoice", "removechoice", "removeimagechoice", "uploadchoice", "originalSyncForm"),
                $classname,
                "",
                $force_active
            );
        }

        // add tab for question feedback within common class assQuestionGUI
        $this->addTab_QuestionFeedback($ilTabs);

        // add tab for question hint within common class assQuestionGUI
        $this->addTab_QuestionHints($ilTabs);

        // add tab for question's suggested solution within common class assQuestionGUI
        $this->addTab_SuggestedSolution($ilTabs, $classname);

        // Assessment of questions sub menu entry
        if ($_GET["q_id"]) {
            $ilTabs->addTarget(
                "statistics",
                $this->ctrl->getLinkTargetByClass($classname, "assessment"),
                array("assessment"),
                $classname,
                ""
            );
        }

        $this->addBackTab($ilTabs);
    }

    /*
     * Create the key index numbers for the array of choices
     *
     * @return array
     */
    public function getChoiceKeys()
    {
        $choiceKeys = array_keys($this->object->answers);
        
        if ($this->object->getShuffle()) {
            $choiceKeys = $this->object->getShuffler()->shuffle($choiceKeys);
        }
        
        return $choiceKeys;
    }
    
    public function getSpecificFeedbackOutput($active_id, $pass)
    {
        // No return value, this question type supports inline specific feedback.
        $output = "";
        return $this->object->prepareTextareaOutput($output, true);
    }

    public function writeQuestionSpecificPostData(ilPropertyFormGUI $form)
    {
        $this->object->setShuffle($_POST["shuffle"]);
        $this->object->setMultilineAnswerSetting($_POST["types"]);
        if (is_array($_POST['choice']['imagename']) && $_POST["types"] == 1) {
            $this->object->isSingleline = true;
            ilUtil::sendInfo($this->lng->txt('info_answer_type_change'), true);
        } else {
            $this->object->isSingleline = ($_POST["types"] == 0) ? true : false;
        }
        $this->object->setThumbSize((strlen($_POST["thumb_size"])) ? $_POST["thumb_size"] : "");
    }

    public function populateQuestionSpecificFormPart(\ilPropertyFormGUI $form)
    {
        $isSingleline = $this->getEditAnswersSingleLine();
        // shuffle
        $shuffle = new ilCheckboxInputGUI($this->lng->txt("shuffle_answers"), "shuffle");
        $shuffle->setValue(1);
        $shuffle->setChecked($this->object->getShuffle());
        $shuffle->setRequired(false);
        $form->addItem($shuffle);

        if ($this->object->getId()) {
            $hidden = new ilHiddenInputGUI("", "ID");
            $hidden->setValue($this->object->getId());
            $form->addItem($hidden);
        }

        if (!$this->object->getSelfAssessmentEditingMode()) {
            // Answer types
            $types = new ilSelectInputGUI($this->lng->txt("answer_types"), "types");
            $types->setRequired(false);
            $types->setValue(($isSingleline) ? 0 : 1);
            $types->setOptions(
                array(
                                    0 => $this->lng->txt('answers_singleline'),
                                    1 => $this->lng->txt('answers_multiline'),
                                )
            );
            $form->addItem($types);
        }

        if ($isSingleline) {
            // thumb size
            $thumb_size = new ilNumberInputGUI($this->lng->txt("thumb_size"), "thumb_size");
            $thumb_size->setSuffix($this->lng->txt("thumb_size_unit_pixel"));
            $thumb_size->setMinValue(20);
            $thumb_size->setDecimals(0);
            $thumb_size->setSize(6);
            $thumb_size->setInfo($this->lng->txt('thumb_size_info'));
            $thumb_size->setValue($this->object->getThumbSize());
            $thumb_size->setRequired(false);
            $form->addItem($thumb_size);
        }
        return $form;
    }

    public function getAfterParticipationSuppressionQuestionPostVars()
    {
        return array();
    }

    public function writeAnswerSpecificPostData(ilPropertyFormGUI $form)
    {
        // Delete all existing answers and create new answers from the form data
        $this->object->flushAnswers();
        if ($this->object->isSingleline) {
            foreach ($_POST['choice']['answer'] as $index => $answertext) {
                $answertext = ilUtil::secureString($answertext);

                $picturefile    = $_POST['choice']['imagename'][$index];
                $file_org_name  = $_FILES['choice']['name']['image'][$index];
                $file_temp_name = $_FILES['choice']['tmp_name']['image'][$index];

                if (strlen($file_temp_name)) {
                    // check suffix
                    $suffix = strtolower(array_pop(explode(".", $file_org_name)));
                    if (in_array($suffix, array( "jpg", "jpeg", "png", "gif" ))) {
                        // upload image
                        $filename = $this->object->buildHashedImageFilename($file_org_name);
                        if ($this->object->setImageFile($filename, $file_temp_name) == 0) {
                            $picturefile = $filename;
                        }
                    }
                }

                $this->object->addAnswer($answertext, $_POST['choice']['points'][$index], $index, $picturefile);
            }
        } else {
            foreach ($_POST['choice']['answer'] as $index => $answer) {
                $answertext = $answer;
                $this->object->addAnswer($answertext, $_POST['choice']['points'][$index], $index);
            }
        }
    }

    public function populateAnswerSpecificFormPart(\ilPropertyFormGUI $form)
    {
        $isSingleline = $this->getEditAnswersSingleLine();

        // Choices
        include_once "./Modules/TestQuestionPool/classes/class.ilSingleChoiceWizardInputGUI.php";
        $choices = new ilSingleChoiceWizardInputGUI($this->lng->txt("answers"), "choice");
        $choices->setRequired(true);
        $choices->setQuestionObject($this->object);
        $choices->setSingleline($isSingleline);
        $choices->setAllowMove(false);
        if ($this->object->getSelfAssessmentEditingMode()) {
            $choices->setSize(40);
        }
        $choices->setMaxLength(800);
        if ($this->object->getAnswerCount() == 0) {
            $this->object->addAnswer("", 0, 0);
        }
        $choices->setValues($this->object->getAnswers());
        $form->addItem($choices);
    }

    public function getAfterParticipationSuppressionAnswerPostVars()
    {
        return array();
    }

    public function getAggregatedAnswersView($relevant_answers)
    {
        return  $this->renderAggregateView(
            $this->aggregateAnswers($relevant_answers, $this->object->getAnswers())
        )->get();
    }

    public function aggregateAnswers($relevant_answers_chosen, $answers_defined_on_question)
    {
        $aggregate = array();
        foreach ($answers_defined_on_question as $answer) {
            $aggregated_info_for_answer                                         = array();
            $aggregated_info_for_answer['answertext']           = $answer->getAnswerText();
            $aggregated_info_for_answer['count_checked']        = 0;

            foreach ($relevant_answers_chosen as $relevant_answer) {
                if ($relevant_answer['value1'] == $answer->getOrder()) {
                    $aggregated_info_for_answer['count_checked']++;
                }
            }
            $aggregated_info_for_answer['count_unchecked'] =
                ceil(count($relevant_answers_chosen) / count($answers_defined_on_question))
                - $aggregated_info_for_answer['count_checked'];

            $aggregate[] = $aggregated_info_for_answer;
        }
        return $aggregate;
    }

    public function renderAggregateView($aggregate)
    {
        $tpl = new ilTemplate('tpl.il_as_aggregated_answers_table.html', true, true, "Modules/TestQuestionPool");
        
        $tpl->setCurrentBlock('headercell');
        $tpl->setVariable('HEADER', $this->lng->txt('tst_answer_aggr_answer_header'));
        $tpl->parseCurrentBlock();
        
        $tpl->setCurrentBlock('headercell');
        $tpl->setVariable('HEADER', $this->lng->txt('tst_answer_aggr_frequency_header'));
        $tpl->parseCurrentBlock();
        
        foreach ($aggregate as $line_data) {
            $tpl->setCurrentBlock('aggregaterow');
            $tpl->setVariable('OPTION', $line_data['answertext']);
            $tpl->setVariable('COUNT', $line_data['count_checked']);
            $tpl->parseCurrentBlock();
        }
        return $tpl;
    }

    private function populateInlineFeedback($template, $answer_id, $user_solution)
    {
        $feedbackOutputRequired = false;

        switch ($this->object->getSpecificFeedbackSetting()) {
            case 1:
                $feedbackOutputRequired = true;
                break;

            case 2:
                if (strcmp($user_solution, $answer_id) == 0) {
                    $feedbackOutputRequired = true;
                }
                break;

            case 3:
                if ($this->object->getAnswer($answer_id)->getPoints() > 0) {
                    $feedbackOutputRequired = true;
                }
                break;
        }

        if ($feedbackOutputRequired) {
            $fb = $this->object->feedbackOBJ->getSpecificAnswerFeedbackTestPresentation($this->object->getId(), $answer_id);
            if (strlen($fb)) {
                $template->setCurrentBlock("feedback");
                $template->setVariable("FEEDBACK", $this->object->prepareTextareaOutput($fb, true));
                $template->parseCurrentBlock();
            }
        }
    }
}