class.assFormulaQuestionGUI.php

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

include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
include_once "./Modules/TestQuestionPool/classes/class.assFormulaQuestion.php";
include_once "./Modules/TestQuestionPool/classes/class.assFormulaQuestionResult.php";
include_once "./Modules/TestQuestionPool/classes/class.assFormulaQuestionVariable.php";
include_once "./Modules/TestQuestionPool/classes/class.assFormulaQuestionUnit.php";
include_once "./Modules/TestQuestionPool/classes/class.assFormulaQuestionUnitCategory.php";
include_once "./Modules/Test/classes/inc.AssessmentConstants.php";
require_once './Modules/TestQuestionPool/interfaces/interface.ilGuiAnswerScoringAdjustable.php';

class assFormulaQuestionGUI extends assQuestionGUI
{
    public function __construct($id = -1)
    {
        parent::__construct();
        $this->object    = new assFormulaQuestion();
        $this->newUnitId = null;
        if ($id >= 0) {
            $this->object->loadFromDb($id);
        }
    }

    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");
            }
            $commands = $_POST["cmd"];
            if (is_array($commands)) {
                foreach ($commands as $key => $value) {
                    if (preg_match("/^suggestrange_.*/", $key, $matches)) {
                        $force_active = true;
                    }
                }
            }
            // edit question properties
            $ilTabs->addTarget(
                "edit_properties",
                $url,
                array(
                    "editQuestion", "save", "cancel", "addSuggestedSolution",
                    "cancelExplorer", "linkChilds", "removeSuggestedSolution",
                    "parseQuestion", "saveEdit", "suggestRange"
                ),
                $classname,
                "",
                $force_active
            );
        }

        if ($_GET["q_id"]) {
            // add tab for question feedback within common class assQuestionGUI
            $this->addTab_QuestionFeedback($ilTabs);
        }

        if ($_GET["q_id"]) {
            // add tab for question hint within common class assQuestionGUI
            $this->addTab_QuestionHints($ilTabs);
        }

        // Unit editor
        if ($_GET['q_id']) {
            // add tab for question hint within common class assQuestionGUI
            $this->addTab_Units($ilTabs);
        }

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

        $this->addBackTab($ilTabs);
    }

    public function getCommand($cmd)
    {
        if (preg_match("/suggestrange_(.*?)/", $cmd, $matches)) {
            $cmd = "suggestRange";
        }
        return $cmd;
    }

    public function suggestRange()
    {
        if ($this->writePostData()) {
            ilUtil::sendInfo($this->getErrorMessage());
        }
        $this->editQuestion();
    }

    protected function writePostData($always = false)
    {
        $hasErrors = (!$always) ? $this->editQuestion(true) : false;
        $checked = true;
        if (!$hasErrors) {
            $this->object->setTitle($_POST["title"]);
            $this->object->setAuthor($_POST["author"]);
            $this->object->setComment($_POST["comment"]);
            include_once "./Services/AdvancedEditing/classes/class.ilObjAdvancedEditing.php";
            $questiontext = ilUtil::stripOnlySlashes($_POST["question"]);
            $this->object->setQuestion($questiontext);
            $this->object->setEstimatedWorkingTime(
                $_POST["Estimated"]["hh"],
                $_POST["Estimated"]["mm"],
                $_POST["Estimated"]["ss"]
            );

            $this->object->parseQuestionText();
            $found_vars    = array();
            $found_results = array();

            
            foreach ($_POST as $key => $value) {
                if (preg_match("/^unit_(\\\$v\d+)$/", $key, $matches)) {
                    array_push($found_vars, $matches[1]);
                }
                if (preg_match("/^unit_(\\\$r\d+)$/", $key, $matches)) {
                    array_push($found_results, $matches[1]);
                }
            }

            //                  if(!$this->object->checkForDuplicateVariables())
            //                  {
//
            //                          $this->addErrorMessage($this->lng->txt("err_duplicate_variables"));
            //                          $checked = FALSE;
            //                  }
            if (!$this->object->checkForDuplicateResults()) {
                $this->addErrorMessage($this->lng->txt("err_duplicate_results"));
                $checked = false;
            }

            foreach ($found_vars as $variable) {
                if ($this->object->getVariable($variable) != null) {
                    $varObj = new assFormulaQuestionVariable($variable, $_POST["range_min_$variable"], $_POST["range_max_$variable"], $this->object->getUnitrepository()->getUnit($_POST["unit_$variable"]), $_POST["precision_$variable"], $_POST["intprecision_$variable"]);
                    $varObj->setRangeMinTxt($_POST["range_min_$variable"]);
                    $varObj->setRangeMaxTxt($_POST["range_max_$variable"]);
                    $this->object->addVariable($varObj);
                }
            }

            $tmp_form_vars = array();
            $tmp_quest_vars = array();
            foreach ($found_results as $result) {
                $tmp_res_match = preg_match_all("/([$][v][0-9]*)/", $_POST["formula_$result"], $form_vars);
                $tmp_form_vars = array_merge($tmp_form_vars, $form_vars[0]);

                $tmp_que_match = preg_match_all("/([$][v][0-9]*)/", $_POST['question'], $quest_vars);
                $tmp_quest_vars= array_merge($tmp_quest_vars, $quest_vars[0]);
            }
            $result_has_undefined_vars = array_diff($tmp_form_vars, $found_vars);
            $question_has_unused_vars =  array_diff($tmp_quest_vars, $tmp_form_vars);

            if (count($result_has_undefined_vars) > 0 || count($question_has_unused_vars) > 0) {
                $error_message = '';
                if (count($result_has_undefined_vars) > 0) {
                    $error_message .= $this->lng->txt("res_contains_undef_var") . '<br>';
                }
                if (count($question_has_unused_vars) > 0) {
                    $error_message .= $this->lng->txt("que_contains_unused_var");
                }
                $checked =  false;
                if ($this->isSaveCommand()) {
                    ilUtil::sendFailure($error_message);
                }
            }
            foreach ($found_results as $result) {
                if (is_object($this->object->getUnitrepository()->getUnit($_POST["unit_$result"]))) {
                    $tmp_result_unit = $this->object->getUnitrepository()->getUnit($_POST["unit_$result"]);
                } else {
                    $tmp_result_unit = null;
                }
                
                if ($this->object->getResult($result) != null) {
                    $use_simple_rating = ($_POST["rating_advanced_$result"] == 1) ? false : true;
                    $resObj = new assFormulaQuestionResult(
                        $result,
                        $_POST["range_min_$result"],
                        $_POST["range_max_$result"],
                        $_POST["tolerance_$result"],
                        $tmp_result_unit,
                        $_POST["formula_$result"],
                        $_POST["points_$result"],
                        $_POST["precision_$result"],
                        $use_simple_rating,
                        ($_POST["rating_advanced_$result"] == 1) ? $_POST["rating_sign_$result"] : "",
                        ($_POST["rating_advanced_$result"] == 1) ? $_POST["rating_value_$result"] : "",
                        ($_POST["rating_advanced_$result"] == 1) ? $_POST["rating_unit_$result"] : "",
                        $_POST["result_type_$result"] != 0 ? $_POST["result_type_$result"] : 0
                    );
                    $resObj->setRangeMinTxt($_POST["range_min_$result"]);
                    $resObj->setRangeMaxTxt($_POST["range_max_$result"]);
                    $this->object->addResult($resObj);
                    $this->object->addResultUnits($resObj, $_POST["units_$result"]);
                }
            }
            if ($checked == false) {
                return 1;
            } else {
                $this->resetSavedPreviewSession();
                return 0;
            }
        } else {
            return 1;
        }
    }

    public function resetSavedPreviewSession()
    {
        global $ilUser;
        $user_id                        = $ilUser->getId();
        $question_id            = $this->object->getId();
        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewSession.php';
        $ilAssQuestionPreviewSession = new ilAssQuestionPreviewSession($user_id, $question_id);
        $ilAssQuestionPreviewSession->setParticipantsSolution(array());
    }
    
    public function isSaveCommand()
    {
        return in_array($this->ctrl->getCmd(), array('saveFQ', 'saveEdit', 'saveReturnFQ'));
    }

    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());
        $form->setMultipart(false);
        $form->setTableWidth('100%');
        $form->setId('assformulaquestion');

        // title, author, description, question, working time (assessment mode)
        $this->addBasicQuestionFormProperties($form);
        
        // Add info text
        $question = $form->getItemByPostVar('question');
        $question->setInfo($this->lng->txt('fq_question_desc'));

        $variables         = $this->object->getVariables();
        $categorized_units = $this->object->getUnitrepository()->getCategorizedUnits();
        $result_units      = $this->object->__get('resultunits');
        
        $unit_options  = array();
        $category_name = '';
        $new_category  = false;
        foreach ((array) $categorized_units as $item) {
            if ($item instanceof assFormulaQuestionUnitCategory) {
                if ($category_name != $item->getDisplayString()) {
                    $new_category  = true;
                    $category_name = $item->getDisplayString();
                }
                continue;
            }
            $unit_options[$item->getId()] = $item->getDisplayString() . ($new_category ? ' (' . $category_name . ')' : '');
            $new_category                 = false;
        }

        if (count($variables)) {
            uasort($variables, function (assFormulaQuestionVariable $v1, assFormulaQuestionVariable $v2) {
                $num_v1 = (int) substr($v1->getVariable(), 2);
                $num_v2 = (int) substr($v2->getVariable(), 2);
                if ($num_v1 > $num_v2) {
                    return 1;
                } elseif ($num_v1 < $num_v2) {
                    return -1;
                }

                return 0;
            });

            foreach ($variables as $variable) {
                $variable_header = new ilFormSectionHeaderGUI();
                $variable_header->setTitle(sprintf($this->lng->txt('variable_x'), $variable->getVariable()));
                
                $range_min = new ilNumberInputGUI($this->lng->txt('range_min'), 'range_min_' . $variable->getVariable());
                $range_min->allowDecimals(true);
                $range_min->setSize(3);
                $range_min->setRequired(true);
                $range_min->setValue($variable->getRangeMin());

                $range_max = new ilNumberInputGUI($this->lng->txt('range_max'), 'range_max_' . $variable->getVariable());
                $range_max->allowDecimals(true);
                $range_max->setSize(3);
                $range_max->setRequired(true);
                $range_max->setValue($variable->getRangeMax());

                $units = new ilSelectInputGUI($this->lng->txt('unit'), 'unit_' . $variable->getVariable());
                $units->setOptions(array(0 => $this->lng->txt('no_selection')) + $unit_options);
                if (is_object($variable->getUnit())) {
                    $units->setValue($variable->getUnit()->getId());
                }

                $precision = new ilNumberInputGUI($this->lng->txt('precision'), 'precision_' . $variable->getVariable());
                $precision->setRequired(true);
                $precision->setSize(3);
                $precision->setMinValue(0);
                $precision->setValue($variable->getPrecision());
                $precision->setInfo($this->lng->txt('fq_precision_info'));

                $intprecision = new ilNumberInputGUI($this->lng->txt('intprecision'), 'intprecision_' . $variable->getVariable());
                $intprecision->setSize(3);
                $intprecision->setMinValue(1);
                $intprecision->setValue($variable->getIntprecision());
                $intprecision->setInfo($this->lng->txt('intprecision_info'));

                $form->addItem($variable_header);
                $form->addItem($range_min);
                $form->addItem($range_max);
                $form->addItem($units);
                $form->addItem($precision);
                $form->addItem($intprecision);
            }
        }

        $results = $this->object->getResults();
        if (count($results)) {
            require_once 'Services/Form/classes/class.ilMultiSelectInputGUI.php';

            uasort($results, function (assFormulaQuestionResult $r1, assFormulaQuestionResult $r2) {
                $num_r1 = (int) substr($r1->getResult(), 2);
                $num_r2 = (int) substr($r2->getResult(), 2);
                if ($num_r1 > $num_r2) {
                    return 1;
                } elseif ($num_r1 < $num_r2) {
                    return -1;
                }

                return 0;
            });

            foreach ($results as $result) {
                $result_header = new ilFormSectionHeaderGUI();
                $result_header->setTitle(sprintf($this->lng->txt('result_x'), $result->getResult()));
                
                $formula = new ilTextInputGUI($this->lng->txt('formula'), 'formula_' . $result->getResult());
                $formula->setInfo($this->lng->txt('fq_formula_desc'));
                $formula->setRequired(true);
                $formula->setSize(50);
                $formula->setValue($result->getFormula());
                $formula->setSuffix(' = ' . $result->getResult());

                if (
                    preg_match("/suggestrange_(.*)/", $this->ctrl->getCmd(), $matches) &&
                    strcmp($matches[1], $result->getResult()) == 0
                ) {
                    // suggest a range for the result
                    if (strlen($result->substituteFormula($variables, $results))) {
                        $result->suggestRange($variables, $results);
                    }
                }

                $range_min = new ilNumberInputGUI($this->lng->txt('range_min'), 'range_min_' . $result->getResult());
                $range_min->allowDecimals(true);
                $range_min->setSize(3);
                $range_min->setRequired(true);
                $range_min->setValue($result->getRangeMin());

                $range_max = new ilNumberInputGUI($this->lng->txt('range_max'), 'range_max_' . $result->getResult());
                $range_max->allowDecimals(true);
                $range_max->setSize(3);
                $range_max->setRequired(true);
                $range_max->setValue($result->getRangeMax());

                $matches = array();

                $precision = new ilNumberInputGUI($this->lng->txt('precision'), 'precision_' . $result->getResult());
                $precision->setRequired(true);
                $precision->setSize(3);
                $precision->setMinValue(0);
                $precision->setInfo($this->lng->txt('fq_precision_info'));
                $precision->setValue($result->getPrecision());

                $tolerance = new ilNumberInputGUI($this->lng->txt('tolerance'), 'tolerance_' . $result->getResult());
                $tolerance->setSize(3);
                $tolerance->setMinValue(0);
                $tolerance->setMaxValue(100);
                $tolerance->allowDecimals(false);
                $tolerance->setInfo($this->lng->txt('tolerance_info'));
                $tolerance->setValue($result->getTolerance());
                
                $suggest_range_button = new ilCustomInputGUI('', '');
                $suggest_range_button->setHtml('<input type="submit" class="btn btn-default" name="cmd[suggestrange_' . $result->getResult() . ']" value="' . $this->lng->txt("suggest_range") . '" />');

                $sel_result_units = new ilSelectInputGUI($this->lng->txt('unit'), 'unit_' . $result->getResult());
                $sel_result_units->setOptions(array(0 => $this->lng->txt('no_selection')) + $unit_options);
                $sel_result_units->setInfo($this->lng->txt('result_unit_info'));
                if (is_object($result->getUnit())) {
                    $sel_result_units->setValue($result->getUnit()->getId());
                }
                
                $mc_result_units = new ilMultiSelectInputGUI($this->lng->txt('result_units'), 'units_' . $result->getResult());
                $mc_result_units->setOptions($unit_options);
                $mc_result_units->setInfo($this->lng->txt('result_units_info'));
                $selectedvalues = array();
                foreach ($unit_options as $unit_id => $txt) {
                    if ($this->hasResultUnit($result, $unit_id, $result_units)) {
                        $selectedvalues[] = $unit_id;
                    }
                }
                $mc_result_units->setValue($selectedvalues);
                
                $result_type = new ilRadioGroupInputGUI($this->lng->txt('result_type_selection'), 'result_type_' . $result->getResult());
                $result_type->setRequired(true);

                $no_type = new ilRadioOption($this->lng->txt('no_result_type'), 0);
                $no_type->setInfo($this->lng->txt('fq_no_restriction_info'));

                $result_dec = new ilRadioOption($this->lng->txt('result_dec'), 1);
                $result_dec->setInfo($this->lng->txt('result_dec_info'));

                $result_frac = new ilRadioOption($this->lng->txt('result_frac'), 2);
                $result_frac->setInfo($this->lng->txt('result_frac_info'));

                $result_co_frac = new ilRadioOption($this->lng->txt('result_co_frac'), 3);
                $result_co_frac->setInfo($this->lng->txt('result_co_frac_info'));

                $result_type->addOption($no_type);
                $result_type->addOption($result_dec);
                $result_type->addOption($result_frac);
                $result_type->addOption($result_co_frac);
                $result_type->setValue(strlen($result->getResultType()) ? $result->getResultType() : 0);

                $points = new ilNumberInputGUI($this->lng->txt('points'), 'points_' . $result->getResult());
                $points->allowDecimals(true);
                $points->setRequired(true);
                $points->setSize(3);
                $points->setMinValue(0);
                $points->setValue(strlen($result->getPoints()) ? $result->getPoints() : 1);

                $rating_type = new ilCheckboxInputGUI($this->lng->txt('advanced_rating'), 'rating_advanced_' . $result->getResult());
                $rating_type->setValue(1);
                $rating_type->setInfo($this->lng->txt('advanced_rating_info'));
                
                if (!$save) {
                    $advanced_rating = $this->canUseAdvancedRating($result);
                    if (!$advanced_rating) {
                        $rating_type->setDisabled(true);
                        $rating_type->setChecked(false);
                    } else {
                        $rating_type->setChecked(strlen($result->getRatingSimple()) && $result->getRatingSimple() ? false : true);
                    }
                }

                $sign = new ilNumberInputGUI($this->lng->txt('rating_sign'), 'rating_sign_' . $result->getResult());
                $sign->setRequired(true);
                $sign->setSize(3);
                $sign->setMinValue(0);
                $sign->setValue($result->getRatingSign());
                $rating_type->addSubItem($sign);

                $value = new ilNumberInputGUI($this->lng->txt('rating_value'), 'rating_value_' . $result->getResult());
                $value->setRequired(true);
                $value->setSize(3);
                $value->setMinValue(0);
                $value->setValue($result->getRatingValue());
                $rating_type->addSubItem($value);

                $unit = new ilNumberInputGUI($this->lng->txt('rating_unit'), 'rating_unit_' . $result->getResult());
                $unit->setRequired(true);
                $unit->setSize(3);
                $unit->setMinValue(0);
                $unit->setValue($result->getRatingUnit());
                $rating_type->addSubItem($unit);
                
                $info_text = new ilNonEditableValueGUI($this->lng->txt('additional_rating_info'));
                $rating_type->addSubItem($info_text);

                $form->addItem($result_header);
                $form->addItem($formula);
                $form->addItem($range_min);
                $form->addItem($range_max);
                $form->addItem($suggest_range_button);
                $form->addItem($precision);
                $form->addItem($tolerance);
                $form->addItem($sel_result_units);
                $form->addItem($mc_result_units);
                $form->addItem($result_type);
                $form->addItem($points);
                $form->addItem($rating_type);
            }

            $defined_result_vars = array();
            $quest_vars = array();

            $defined_result_res = array();
            $result_vars = array();
            
            foreach ($variables as $key => $object) {
                $quest_vars[$key] = $key;
            }

            foreach ($results as $key => $object) {
                $result_vars[$key] = $key;
            }
            
            foreach ($results as $tmp_result) {
                $formula = $tmp_result->getFormula();

                preg_match_all("/([$][v][0-9]*)/", $formula, $form_vars);
                preg_match_all("/([$][r][0-9]*)/", $formula, $form_res);
                foreach ($form_vars[0] as $res_var) {
                    $defined_result_vars[$res_var] = $res_var;
                }

                foreach ($form_res[0] as $res_res) {
                    $defined_result_res[$res_res] = $res_res;
                }
            }
        }
        
        $result_has_undefined_vars = array();
        $question_has_unused_vars = array();
        
        if (is_array($quest_vars) && count($quest_vars) > 0) {
            $result_has_undefined_vars = array_diff($defined_result_vars, $quest_vars);
            $question_has_unused_vars = array_diff($quest_vars, $defined_result_vars);
        }

        if (is_array($result_vars) && count($result_vars) > 0) {
            $result_has_undefined_res = array_diff($defined_result_res, $result_vars);
        }
        $error_message = '';
        
        if (count($result_has_undefined_vars) > 0 || count($question_has_unused_vars) > 0) {
            if (count($result_has_undefined_vars) > 0) {
                $error_message .= $this->lng->txt("res_contains_undef_var") . '<br>';
            }
            if (count($question_has_unused_vars) > 0) {
                $error_message .= $this->lng->txt("que_contains_unused_var") . '<br>';
            }
    
            $checked =  false;
            if ($save) {
                ilUtil::sendFailure($error_message);
            }
        }

        if (is_array($result_has_undefined_res) && count($result_has_undefined_res) > 0) {
            $error_message .= $this->lng->txt("res_contains_undef_res") . '<br>';
            $checked =  false;
        }
        
        if ($save && !$checked) {
            ilUtil::sendFailure($error_message);
        }
        
        if ($this->object->getId()) {
            $hidden = new ilHiddenInputGUI("", "ID");
            $hidden->setValue($this->object->getId());
            $form->addItem($hidden);
        }

        $this->populateTaxonomyFormSection($form);

        $form->addCommandButton('parseQuestion', $this->lng->txt("parseQuestion"));
        $form->addCommandButton('saveReturnFQ', $this->lng->txt("save_return"));
        $form->addCommandButton('saveFQ', $this->lng->txt("save"));
        
        $errors = $checked;

        if ($save) {
            $found_vars    = array();
            $found_results = array();
            foreach ((array) $_POST as $key => $value) {
                if (preg_match("/^unit_(\\\$v\d+)$/", $key, $matches)) {
                    array_push($found_vars, $matches[1]);
                }
                if (preg_match("/^unit_(\\\$r\d+)$/", $key, $matches)) {
                    array_push($found_results, $matches[1]);
                }
            }
            
            $form->setValuesByPost();
            $errors = !$form->checkInput();

            $custom_errors = false;
            if (count($variables)) {
                foreach ($variables as $variable) {
                    $min_range = $form->getItemByPostVar('range_min_' . $variable->getVariable());
                    $max_range = $form->getItemByPostVar('range_max_' . $variable->getVariable());
                    if ($min_range->getValue() > $max_range->getValue()) {
                        $min_range->setAlert($this->lng->txt('err_range'));
                        $max_range->setAlert($this->lng->txt('err_range'));
                        $custom_errors = true;
                    }
                }
            }

            if (count($results)) {
                foreach ($results as $result) {
                    $min_range = $form->getItemByPostVar('range_min_' . $result->getResult());
                    $max_range = $form->getItemByPostVar('range_max_' . $result->getResult());
                    if ($min_range->getValue() > $max_range->getValue()) {
                        $min_range->setAlert($this->lng->txt('err_range'));
                        $max_range->setAlert($this->lng->txt('err_range'));
                        $custom_errors = true;
                    }


                    $formula = $form->getItemByPostVar('formula_' . $result->getResult());
                    if (strpos($formula->getValue(), $result->getResult()) !== false) {
                        $formula->setAlert($this->lng->txt('errRecursionInResult'));
                        $custom_errors = true;
                    }
                    
                    $result_unit    = $form->getItemByPostVar('unit_' . $result->getResult());
                    $rating_advanced = $form->getItemByPostVar('rating_advanced_' . $result->getResult());
                    if (((int) $result_unit->getValue() <= 0) && $rating_advanced->getChecked()) {
                        unset($_POST['rating_advanced_' . $result->getResult()]);
                        $rating_advanced->setDisabled(true);
                        $rating_advanced->setChecked(false);
                        $rating_advanced->setAlert($this->lng->txt('err_rating_advanced_not_allowed'));
                        $custom_errors = true;
                    } elseif ($rating_advanced->getChecked()) {
                        $rating_sign  = $form->getItemByPostVar('rating_sign_' . $result->getResult());
                        $rating_value = $form->getItemByPostVar('rating_value_' . $result->getResult());
                        $rating_unit  = $form->getItemByPostVar('rating_unit_' . $result->getResult());
                        
                        $percentage = $rating_sign->getValue() + $rating_value->getValue() + $rating_unit->getValue();
                        if ($percentage != 100) {
                            $rating_advanced->setAlert($this->lng->txt('err_wrong_rating_advanced'));
                            $custom_errors = true;
                        }
                    }

                    preg_match_all("/([$][v][0-9]*)/", $formula->getValue(), $form_vars);
                    $result_has_undefined_vars = array_diff($form_vars[0], (array) $found_vars);
                    if (count($result_has_undefined_vars)) {
                        $errors = true;
                        ilUtil::sendInfo($this->lng->txt('res_contains_undef_var'));
                    }
                }
            }
            
            if ($custom_errors && !$errors) {
                $errors = true;
                ilUtil::sendFailure($this->lng->txt('form_input_not_valid'));
            }
            $form->setValuesByPost(); // again, because checkInput now performs the whole stripSlashes handling and we need this if we don't want to have duplication of backslashes
            if ($errors) {
                $checkonly = false;
            }
        }

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

    private function hasResultUnit($result, $unit_id, $resultunits)
    {
        if (array_key_exists($result->getResult(), $resultunits)) {
            if (array_key_exists($unit_id, $resultunits[$result->getResult()])) {
                return true;
            }
        }
        return false;
    }

    private function canUseAdvancedRating($result)
    {
        $resultunit = $result->getUnit();

        /*
         *  if there is a result-unit (unit selectbox) selected it is possible to use advanced rating
         *      if there is no result-unit selected it is NOT possible to use advanced rating, because there is no
         *      definition if the result-value or the unit-value should be the correct solution!!
         *
         */
        if (is_object($resultunit)) {
            return true;
        } else {
            return false;
        }
    }

    public function parseQuestion()
    {
        $this->writePostData();
        $this->editQuestion();
    }
    
    public function saveReturnFQ()
    {
        global $ilUser;
        $old_id = $_GET["q_id"];
        $result = $this->writePostData();
        if ($result == 0) {
            $ilUser->setPref("tst_lastquestiontype", $this->object->getQuestionType());
            $ilUser->writePref("tst_lastquestiontype", $this->object->getQuestionType());
            $this->saveTaxonomyAssignments();
            $this->object->saveToDb();
            $originalexists = $this->object->_questionExistsInPool($this->object->original_id);
            include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
            if (($_GET["calling_test"] || (isset($_GET['calling_consumer']) && (int) $_GET['calling_consumer'])) && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId())) {
                $this->ctrl->redirect($this, "originalSyncForm");
                return;
            } elseif ($_GET["calling_test"]) {
                require_once 'Modules/Test/classes/class.ilObjTest.php';
                $test = new ilObjTest($_GET["calling_test"]);
                #var_dump(assQuestion::_questionExistsInTest($this->object->getId(), $test->getTestId()));
                $q_id = $this->object->getId();
                if (!assQuestion::_questionExistsInTest($this->object->getId(), $test->getTestId())) {
                    global $tree, $ilDB, $ilPluginAdmin;

                    include_once("./Modules/Test/classes/class.ilObjTest.php");
                    $_GET["ref_id"] = $_GET["calling_test"];
                    $test = new ilObjTest($_GET["calling_test"], true);

                    require_once 'Modules/Test/classes/class.ilTestQuestionSetConfigFactory.php';
                    $testQuestionSetConfigFactory = new ilTestQuestionSetConfigFactory($tree, $ilDB, $ilPluginAdmin, $test);

                    $new_id = $test->insertQuestion(
                        $testQuestionSetConfigFactory->getQuestionSetConfig(),
                        $this->object->getId()
                    );

                    $q_id = $new_id;
                    if (isset($_REQUEST['prev_qid'])) {
                        $test->moveQuestionAfter($this->object->getId() + 1, $_REQUEST['prev_qid']);
                    }

                    $this->ctrl->setParameter($this, 'q_id', $new_id);
                    $this->ctrl->setParameter($this, 'calling_test', $_GET['calling_test']);
                    #$this->ctrl->setParameter($this, 'test_ref_id', false);
                }
                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                if ($_REQUEST['test_express_mode']) {
                    ilUtil::redirect(ilTestExpressPage::getReturnToPageLink($q_id));
                } else {
                    ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=" . $_GET["calling_test"]);
                }
            } else {
                if ($this->object->getId() !=  $old_id) {
                    $this->callNewIdListeners($this->object->getId());
                    ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                    $this->ctrl->redirectByClass("ilobjquestionpoolgui", "questions");
                }
                if (strcmp($_SESSION["info"], "") != 0) {
                    ilUtil::sendSuccess($_SESSION["info"] . "<br />" . $this->lng->txt("msg_obj_modified"), true);
                } else {
                    ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                }
                $this->ctrl->redirectByClass("ilobjquestionpoolgui", "questions");
            }
        } else {
            $ilUser->setPref("tst_lastquestiontype", $this->object->getQuestionType());
            $ilUser->writePref("tst_lastquestiontype", $this->object->getQuestionType());
            $this->object->saveToDb();
            $this->editQuestion();
        }
    }

    public function saveFQ()
    {
        $result = $this->writePostData();

        if ($result == 1) {
            $this->editQuestion();
        } else {
            $this->saveTaxonomyAssignments();
            $this->save();
        }
    }
    public function checkInput()
    {
        if ((!$_POST["title"]) or (!$_POST["author"]) or (!$_POST["question"])) {
            $this->addErrorMessage($this->lng->txt("fill_out_all_required_fields"));
            return false;
        }


        return true;
    }

    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
    ) {
        // get the solution of the user for the active pass or from the last pass if allowed
        $user_solution = array();
        if (($active_id > 0) && (!$show_correct_solution)) {
            $solutions = array();
            include_once "./Modules/Test/classes/class.ilObjTest.php";
            if (!ilObjTest::_getUsePreviousAnswers($active_id, true)) {
                if (is_null($pass)) {
                    $pass = ilObjTest::_getPass($active_id);
                }
            }
            $user_solution["active_id"] = $active_id;
            $user_solution["pass"]      = $pass;
            $solutions                  =&$this->object->getSolutionValues($active_id, $pass);
            foreach ($solutions as $idx => $solution_value) {
                if (preg_match("/^(\\\$v\\d+)$/", $solution_value["value1"], $matches)) {
                    $user_solution[$matches[1]] = $solution_value["value2"];
                } elseif (preg_match("/^(\\\$r\\d+)$/", $solution_value["value1"], $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["value"] = $solution_value["value2"];
                } elseif (preg_match("/^(\\\$r\\d+)_unit$/", $solution_value["value1"], $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["unit"] = $solution_value["value2"];
                }
            }
        } elseif ($active_id) {
            $solutions = null;
            include_once "./Modules/Test/classes/class.ilObjTest.php";
            if (!ilObjTest::_getUsePreviousAnswers($active_id, true)) {
                if (is_null($pass)) {
                    $pass = ilObjTest::_getPass($active_id);
                }
            }
            $user_solution = (array) $this->object->getBestSolution($this->object->getSolutionValues($active_id, $pass));
        } elseif (is_object($this->getPreviewSession())) {
            $solutionValues = array();
            
            foreach ($this->getPreviewSession()->getParticipantsSolution() as $val1 => $val2) {
                $solutionValues[] = array('value1' => $val1, 'value2' => $val2);
            }
            
            $user_solution = (array) $this->object->getBestSolution($solutionValues);
        }
    
        $template = new ilTemplate("tpl.il_as_qpl_formulaquestion_output_solution.html", true, true, 'Modules/TestQuestionPool');
        $questiontext = $this->object->substituteVariables($user_solution, $graphicalOutput, true, $result_output);

        $template->setVariable("QUESTIONTEXT", $this->object->prepareTextareaOutput($questiontext, true));
        $questionoutput   = $template->get();
        $solutiontemplate = new ilTemplate("tpl.il_as_tst_solution_output.html", true, true, "Modules/TestQuestionPool");
        $feedback = ($show_feedback) ? $this->getGenericFeedbackOutput($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)
    {
        $user_solution = array();
        
        if (is_object($this->getPreviewSession())) {
            $solutions = (array) $this->getPreviewSession()->getParticipantsSolution();
    
            foreach ($solutions as $val1 => $val2) {
                if (preg_match("/^(\\\$v\\d+)$/", $val1, $matches)) {
                    $user_solution[$matches[1]] = $val2;
                } elseif (preg_match("/^(\\\$r\\d+)$/", $val1, $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["value"] = $val2;
                } elseif (preg_match("/^(\\\$r\\d+)_unit$/", $val1, $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["unit"] = $val2;
                }
    
                if (preg_match("/^(\\\$r\\d+)/", $val1, $matches) && $user_solution[$matches[1]]["result_type"] == 0) {
                    $user_solution[$matches[1]]["result_type"] = assFormulaQuestionResult::getResultTypeByQstId($this->object->getId(), $val1);
                }
            }
        }
        
        if (!$this->object->hasRequiredVariableSolutionValues($user_solution)) {
            $user_solution = $this->object->getInitialVariableSolutionValues();
            
            if (is_object($this->getPreviewSession())) {
                $this->getPreviewSession()->setParticipantsSolution($user_solution);
            }
        }

        $template = new ilTemplate("tpl.il_as_qpl_formulaquestion_output.html", true, true, 'Modules/TestQuestionPool');
        if (is_object($this->getPreviewSession())) {
            $questiontext = $this->object->substituteVariables($user_solution, false, false, false);
        } else {
            $questiontext = $this->object->substituteVariables(array());
        }
        $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, $show_feedback = false)
    // hey.
    {
        ilUtil::sendInfo($this->lng->txt('enter_valid_values'));
        // get the solution of the user for the active pass or from the last pass if allowed
        $user_solution = array();
        if ($active_id) {
            $solutions = (array) $this->object->getTestOutputSolutions($active_id, $pass);
            
            $actualPassIndex = null;
            if ($this->object->getTestPresentationConfig()->isSolutionInitiallyPrefilled()) {
                require_once 'Modules/Test/classes/class.ilObjTest.php';
                $actualPassIndex = ilObjTest::_getPass($active_id);
            }
            
            foreach ($solutions as $idx => $solution_value) {
                if (preg_match("/^(\\\$v\\d+)$/", $solution_value["value1"], $matches)) {
                    if ($this->object->getTestPresentationConfig()->isSolutionInitiallyPrefilled()) {
                        $this->object->saveCurrentSolution($active_id, $actualPassIndex, $matches[1], $solution_value["value2"], true);
                    }
                    
                    $user_solution[$matches[1]] = $solution_value["value2"];
                } elseif (preg_match("/^(\\\$r\\d+)$/", $solution_value["value1"], $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["value"] = $solution_value["value2"];
                } elseif (preg_match("/^(\\\$r\\d+)_unit$/", $solution_value["value1"], $matches)) {
                    if (!array_key_exists($matches[1], $user_solution)) {
                        $user_solution[$matches[1]] = array();
                    }
                    $user_solution[$matches[1]]["unit"] = $solution_value["value2"];
                }

                if (preg_match("/^(\\\$r\\d+)/", $solution_value["value1"], $matches) && $user_solution[$matches[1]]["result_type"] == 0) {
                    $user_solution[$matches[1]]["result_type"] = assFormulaQuestionResult::getResultTypeByQstId($this->object->getId(), $solution_value["value1"]);
                }
            }
        }

        // fau: testNav - take question variables always from authorized solution because they are saved with this flag, even if an authorized solution is not saved
        $solutions = $this->object->getSolutionValues($active_id, $pass, true);
        foreach ($solutions as $idx => $solution_value) {
            if (preg_match("/^(\\\$v\\d+)$/", $solution_value["value1"], $matches)) {
                $user_solution[$matches[1]] = $solution_value["value2"];
            }
        }
        // fau.
        
        if (!$this->object->hasRequiredVariableSolutionValues($user_solution)) {
            foreach ($this->object->getInitialVariableSolutionValues() as $val1 => $val2) {
                $this->object->saveCurrentSolution($active_id, $pass, $val1, $val2, true);
            }
        }

        // generate the question output
        $template = new ilTemplate("tpl.il_as_qpl_formulaquestion_output.html", true, true, 'Modules/TestQuestionPool');

        $questiontext = $this->object->substituteVariables($user_solution);

        $template->setVariable("QUESTIONTEXT", $this->object->prepareTextareaOutput($questiontext, true));

        $questionoutput = $template->get();
        $pageoutput     = $this->outQuestionPage("", $is_postponed, $active_id, $questionoutput);
        return $pageoutput;
    }

    public function getSpecificFeedbackOutput($active_id, $pass)
    {
        return '';
    }
}