class.assClozeTest.php

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

require_once './Modules/TestQuestionPool/classes/class.assQuestion.php';
require_once './Modules/Test/classes/inc.AssessmentConstants.php';
require_once './Modules/TestQuestionPool/classes/class.assClozeGapCombination.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjQuestionScoringAdjustable.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjAnswerScoringAdjustable.php';
require_once './Modules/TestQuestionPool/interfaces/interface.iQuestionCondition.php';
require_once './Modules/TestQuestionPool/classes/class.ilUserQuestionResult.php';

class assClozeTest extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable, iQuestionCondition
{
        var $gaps;

        var $gap_combinations;


        var $gap_combinations_exists;
        
        var $start_tag;

        var $end_tag;
        
        var $textgap_rating;

        var $identical_scoring;

        var $fixedTextLength;

        public $cloze_text;

        function __construct(
                $title = "",
                $comment = "",
                $author = "",
                $owner = -1,
                $question = ""
        )
        {
                parent::__construct($title, $comment, $author, $owner, $question);
                $this->start_tag = "[gap]";
                $this->end_tag = "[/gap]";
                $this->gaps = array();
                $this->setQuestion($question); // @TODO: Should this be $question?? See setter for why this is not trivial.
                $this->fixedTextLength = "";
                $this->identical_scoring = 1;
                $this->gap_combinations_exists = false;
                $this->gap_combinations = array();
        }

        public function isComplete()
        {
                if (strlen($this->getTitle()) 
                        && $this->getAuthor() 
                        && $this->getClozeText() 
                        && count($this->getGaps()) 
                        && $this->getMaximumPoints() > 0)
                {
                        return true;
                }
                return false;
        }

        public function cleanQuestiontext($text)
        {
                $text = preg_replace("/\[gap[^\]]*?\]/", "[gap]", $text);
                $text = preg_replace("/<gap([^>]*?)>/", "[gap]", $text);
                $text = str_replace("</gap>", "[/gap]", $text);
                return $text;
        }

        public function loadFromDb($question_id)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT qpl_questions.*, " . $this->getAdditionalTableName() . ".* FROM qpl_questions LEFT JOIN " . $this->getAdditionalTableName() . " ON " . $this->getAdditionalTableName() . ".question_fi = qpl_questions.question_id WHERE qpl_questions.question_id = %s",
                        array("integer"),
                        array($question_id)
                );
                if ($result->numRows() == 1)
                {
                        $data = $ilDB->fetchAssoc($result);
                        $this->setId($question_id);
                        $this->setNrOfTries($data['nr_of_tries']);
                        $this->setObjId($data["obj_fi"]);
                        $this->setTitle($data["title"]);
                        $this->setComment($data["description"]);
                        $this->setOriginalId($data["original_id"]);
                        $this->setAuthor($data["author"]);
                        $this->setPoints($data["points"]);
                        $this->setOwner($data["owner"]);
                        $this->setQuestion($this->cleanQuestiontext($data["question_text"]));
                        $this->setClozeText($data['cloze_text']);
                        $this->setFixedTextLength($data["fixed_textlen"]);
                        $this->setIdenticalScoring(($data['tstamp'] == 0) ? true : $data["identical_scoring"]);
                        // replacement of old syntax with new syntax
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->question = ilRTE::_replaceMediaObjectImageSrc($this->question, 1);
                        $this->cloze_text = ilRTE::_replaceMediaObjectImageSrc($this->cloze_text, 1);
                        $this->setTextgapRating($data["textgap_rating"]);
                        $this->setEstimatedWorkingTime(substr($data["working_time"], 0, 2), substr($data["working_time"], 3, 2), substr($data["working_time"], 6, 2));
                        
                        try
                        {
                                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
                        }
                        catch(ilTestQuestionPoolException $e)
                        {
                        }

                        // open the cloze gaps with all answers
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                        include_once "./Modules/TestQuestionPool/classes/class.assClozeGap.php";
                        $result = $ilDB->queryF("SELECT * FROM qpl_a_cloze WHERE question_fi = %s ORDER BY gap_id, aorder ASC",
                                array("integer"),
                                array($question_id)
                        );
                        if ($result->numRows() > 0)
                        {
                                $this->gaps = array();
                                while ($data = $ilDB->fetchAssoc($result)) 
                                {
                                        switch ($data["cloze_type"])
                                        {
                                                case CLOZE_TEXT:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_TEXT);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                        );
                                                        $this->gaps[$data["gap_id"]]->setGapSize($data['gap_size']);
                                                        
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                                case CLOZE_SELECT:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_SELECT);
                                                                $this->gaps[$data["gap_id"]]->setShuffle($data["shuffle"]);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                                );
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                                case CLOZE_NUMERIC:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_NUMERIC);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                        );
                                                        $this->gaps[$data["gap_id"]]->setGapSize($data['gap_size']);
                                                        $answer->setLowerBound($data["lowerlimit"]);
                                                        $answer->setUpperBound($data["upperlimit"]);
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                        }
                                }
                        }
                }
                $assClozeGapCombinationObj = new assClozeGapCombination();
                $check_for_gap_combinations = $assClozeGapCombinationObj->loadFromDb($question_id);
                if(count($check_for_gap_combinations) != 0)
                {
                        $this->setGapCombinationsExists(true);
                        $this->setGapCombinations($check_for_gap_combinations);
                }
                parent::loadFromDb($question_id);
        }

        #region Save question to db
        
        public function saveToDb($original_id = "")
        {
                $this->saveQuestionDataToDb($original_id);
                $this->saveAdditionalQuestionDataToDb();
                $this->saveAnswerSpecificDataToDb();

                parent::saveToDb($original_id);
        }

        public function saveAnswerSpecificDataToDb()
        {
                global $ilDB;
                
                $ilDB->manipulateF( "DELETE FROM qpl_a_cloze WHERE question_fi = %s",
                                                        array( "integer" ),
                                                        array( $this->getId() )
                );

                foreach ($this->gaps as $key => $gap)
                {
                        $this->saveClozeGapItemsToDb( $gap, $key );
                }
        }

        public function saveAdditionalQuestionDataToDb()
        {
                global $ilDB;

                $ilDB->manipulateF( "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
                                                        array( "integer" ),
                                                        array( $this->getId() )
                );

                $ilDB->manipulateF( "INSERT INTO " . $this->getAdditionalTableName()
                                                                . " (question_fi, textgap_rating, identical_scoring, fixed_textlen, cloze_text) VALUES (%s, %s, %s, %s, %s)",
                                                        array(
                                                                "integer",
                                                                "text",
                                                                "text",
                                                                "integer",
                                                                "text"
                                                        ),
                                                        array(
                                                                $this->getId(),
                                                                $this->getTextgapRating(),
                                                                $this->getIdenticalScoring(),
                                                                $this->getFixedTextLength() ? $this->getFixedTextLength() : NULL,
                                                                ilRTE::_replaceMediaObjectImageSrc($this->getClozeText(), 0)
                                                        )
                );
        }

        protected function saveClozeGapItemsToDb($gap, $key)
        {
                global $ilDB;
                foreach ($gap->getItems($this->getShuffler()) as $item)
                {
                        $query   = "";
                        $next_id = $ilDB->nextId( 'qpl_a_cloze' );
                        switch ($gap->getType())
                        {
                                case CLOZE_TEXT:
                                        $this->saveClozeTextGapRecordToDb($next_id, $key, $item, $gap );
                                        break;
                                case CLOZE_SELECT:
                                        $this->saveClozeSelectGapRecordToDb($next_id, $key, $item, $gap );
                                        break;
                                case CLOZE_NUMERIC:
                                        $this->saveClozeNumericGapRecordToDb($next_id, $key, $item, $gap );
                                        break;
                        }
                }
        }

        protected function saveClozeTextGapRecordToDb($next_id, $key, $item, $gap)
        {
                global $ilDB;
                $ilDB->manipulateF( "INSERT INTO qpl_a_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type, gap_size) VALUES (%s, %s, %s, %s, %s, %s, %s, %s)",
                                                        array(
                                                                "integer",
                                                                "integer",
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text",
                                                                "integer"
                                                        ),
                                                        array(
                                                                $next_id,
                                                                $this->getId(),
                                                                $key,
                                                                strlen( $item->getAnswertext() ) ? $item->getAnswertext() : "",
                                                                $item->getPoints(),
                                                                $item->getOrder(),
                                                                $gap->getType(),
                                                                (int)$gap->getGapSize()
                                                        )
                );
        }

        protected function saveClozeSelectGapRecordToDb($next_id, $key, $item, $gap)
        {
                global $ilDB;
                $ilDB->manipulateF( "INSERT INTO qpl_a_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type, shuffle) VALUES (%s, %s, %s, %s, %s, %s, %s, %s)",
                                                        array(
                                                                "integer",
                                                                "integer",
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text",
                                                                "text"
                                                        ),
                                                        array(
                                                                $next_id,
                                                                $this->getId(),
                                                                $key,
                                                                strlen( $item->getAnswertext() ) ? $item->getAnswertext() : "",
                                                                $item->getPoints(),
                                                                $item->getOrder(),
                                                                $gap->getType(),
                                                                ($gap->getShuffle()) ? "1" : "0"
                                                        )
                );
        }

        protected function saveClozeNumericGapRecordToDb($next_id, $key, $item, $gap)
        {
                global $ilDB;
                
                include_once "./Services/Math/classes/class.EvalMath.php";
                $eval = new EvalMath();
                $eval->suppress_errors = TRUE;
                $ilDB->manipulateF( "INSERT INTO qpl_a_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type, lowerlimit, upperlimit, gap_size) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
                                                        array(
                                                                "integer",
                                                                "integer",
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text",
                                                                "text",
                                                                "text",
                                                                "integer"
                                                        ),
                                                        array(
                                                                $next_id,
                                                                $this->getId(),
                                                                $key,
                                                                strlen( $item->getAnswertext() ) ? $item->getAnswertext() : "",
                                                                $item->getPoints(),
                                                                $item->getOrder(),
                                                                $gap->getType(),
                                                                ($eval->e( $item->getLowerBound() !== FALSE ) && strlen( $item->getLowerBound()
                                                                ) > 0) ? $item->getLowerBound() : $item->getAnswertext(),
                                                                ($eval->e( $item->getUpperBound() !== FALSE ) && strlen( $item->getUpperBound()
                                                                ) > 0) ? $item->getUpperBound() : $item->getAnswertext(),
                                                                (int)$gap->getGapSize()
                                                        )
                );
        }



        #endregion Save question to db

        function getGaps()
        {
                return $this->gaps;
        }


        function flushGaps() 
        {
                $this->gaps = array();
        }

        function setClozeText($cloze_text = "")
        {
                $this->gaps = array();
                $cloze_text = $this->cleanQuestiontext($cloze_text);
                $this->cloze_text = $cloze_text;
                $this->createGapsFromQuestiontext();
        }

        function setClozeTextValue($cloze_text = "")
        {
                $this->cloze_text = $cloze_text;
        }
        
        function getClozeText() 
        {
                return $this->cloze_text;
        }

        function getStartTag() 
        {
                return $this->start_tag;
        }

        function setStartTag($start_tag = "[gap]") 
        {
                $this->start_tag = $start_tag;
        }
        
        function getEndTag() 
        {
                return $this->end_tag;
        }

        function setEndTag($end_tag = "[/gap]") 
        {
                $this->end_tag = $end_tag;
        }

        function createGapsFromQuestiontext()
        {
                include_once "./Modules/TestQuestionPool/classes/class.assClozeGap.php";
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                $search_pattern = "|\[gap\](.*?)\[/gap\]|i";
                preg_match_all($search_pattern, $this->getClozeText(), $found);
                $this->gaps = array();
                if (count($found[0]))
                {
                        foreach ($found[1] as $gap_index => $answers)
                        {
                                // create text gaps by default
                                $gap = new assClozeGap(CLOZE_TEXT);
                                $textparams = preg_split("/(?<!\\\\),/", $answers);
                                foreach ($textparams as $key => $value)
                                {
                                        $answer = new assAnswerCloze($value, 0, $key);
                                        $gap->addItem($answer);
                                }
                                $this->gaps[$gap_index] = $gap;
                        }
                }
        }
        
        function setGapType($gap_index, $gap_type)
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setType($gap_type);
                }
        }

        function setGapShuffle($gap_index = 0, $shuffle = 1) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setShuffle($shuffle);
                }
        }

        function clearGapAnswers() 
        {
                foreach ($this->gaps as $gap_index => $gap)
                {
                        $this->gaps[$gap_index]->clearItems();
                }
        }

        function getGapCount() 
        {
                if (is_array($this->gaps))
                {
                        return count($this->gaps);
                }
                else
                {
                        return 0;
                }
        }

        function addGapAnswer($gap_index, $order, $answer) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        if ($this->gaps[$gap_index]->getType() == CLOZE_NUMERIC)
                        {
                                // only allow notation with "." for real numbers
                                $answer = str_replace(",", ".", $answer);
                        }
                        $this->gaps[$gap_index]->addItem(new assAnswerCloze($answer, 0, $order));
                }
        }
        
        function getGap($gap_index = 0) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        return $this->gaps[$gap_index];
                }
                else
                {
                        return NULL;
                }
        }

        public function setGapSize($gap_index, $order, $size)
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setGapSize( $size);
                }
        }
        
        function setGapAnswerPoints($gap_index, $order, $points) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemPoints($order, $points);
                }
        }

        function addGapText($gap_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                        $answer = new assAnswerCloze(
                                "",
                                0,
                                $this->gaps[$gap_index]->getItemCount()
                        );
                        $this->gaps[$gap_index]->addItem($answer);
                }
        }
        
        function addGapAtIndex($gap, $index)
        {
                $this->gaps[$index] = $gap;
        }

        function setGapAnswerLowerBound($gap_index, $order, $bound) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemLowerBound($order, $bound);
                }
        }

        function setGapAnswerUpperBound($gap_index, $order, $bound) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemUpperBound($order, $bound);
                }
        }

        function getMaximumPoints() 
        {
                $assClozeGapCombinationObj = new assClozeGapCombination();
                $points = 0;
                $gaps_used_in_combination = array();
                if($assClozeGapCombinationObj->combinationExistsForQid($this->getId()))
                {
                        $points =  $assClozeGapCombinationObj->getMaxPointsForCombination($this->getId());
                        $gaps_used_in_combination = $assClozeGapCombinationObj->getGapsWhichAreUsedInCombination($this->getId());
                }
                foreach ($this->gaps as $gap_index => $gap) 
                {
                        if(! array_key_exists($gap_index, $gaps_used_in_combination))
                        {
                                if ($gap->getType() == CLOZE_TEXT)
                                {
                                        $gap_max_points = 0;
                                        foreach ($gap->getItems($this->getShuffler()) as $item)
                                        {
                                                if ($item->getPoints() > $gap_max_points)
                                                {
                                                        $gap_max_points = $item->getPoints();
                                                }
                                        }
                                        $points += $gap_max_points;
                                }
                                else if ($gap->getType() == CLOZE_SELECT)
                                {
                                        $srpoints = 0;
                                        foreach ($gap->getItems($this->getShuffler()) as $item)
                                        {
                                                if ($item->getPoints() > $srpoints)
                                                {
                                                        $srpoints = $item->getPoints();
                                                }
                                        }
                                        $points += $srpoints;
                                }
                                else if ($gap->getType() == CLOZE_NUMERIC)
                                {
                                        $numpoints = 0;
                                        foreach ($gap->getItems($this->getShuffler()) as $item)
                                        {
                                                if ($item->getPoints() > $numpoints)
                                                {
                                                        $numpoints = $item->getPoints();
                                                }
                                        }
                                        $points += $numpoints;
                                }
                        }
                }
                        
                return $points;
        }

        function duplicate($for_test = true, $title = "", $author = "", $owner = "", $testObjId = null)
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // duplicate the question in database
                $this_id = $this->getId();
                $thisObjId = $this->getObjId();
                
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->id);
                $clone->id = -1;
                
                if( (int)$testObjId > 0 )
                {
                        $clone->setObjId($testObjId);
                }
                
                if ($title)
                {
                        $clone->setTitle($title);
                }
                if ($author)
                {
                        $clone->setAuthor($author);
                }
                if ($owner)
                {
                        $clone->setOwner($owner);
                }
                if ($for_test)
                {
                        $clone->saveToDb($original_id);
                }
                else
                {
                        $clone->saveToDb();
                }
                if($this->gap_combinations_exists)
                {
                        $this->copyGapCombination($this_id, $clone->getId());
                }
                if ($for_test)
                {
                        $clone->saveToDb($original_id);
                }
                else
                {
                        $clone->saveToDb();
                }
                // copy question page content
                $clone->copyPageOfQuestion($this_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($this_id);

                $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());

                return $clone->getId();
        }
        
        function copyObject($target_questionpool_id, $title = "")
        {
                if ($this->getId() <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                
                $thisId = $this->getId();
                $thisObjId = $this->getObjId();
                
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->getId());
                $clone->id = -1;
                $clone->setObjId($target_questionpool_id);
                if ($title)
                {
                        $clone->setTitle($title);
                }

                $clone->saveToDb();

                if($this->gap_combinations_exists)
                {
                        $this->copyGapCombination($original_id, $clone->getId());
                        $clone->saveToDb();
                }

                // copy question page content
                $clone->copyPageOfQuestion($original_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($original_id);

                $clone->onCopy($thisObjId, $thisId, $clone->getObjId(), $clone->getId());
                
                return $clone->getId();
        }

        public function createNewOriginalFromThisDuplicate($targetParentId, $targetQuestionTitle = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }

                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");

                $sourceQuestionId = $this->id;
                $sourceParentId = $this->getObjId();

                // duplicate the question in database
                $clone = $this;
                $clone->id = -1;

                $clone->setObjId($targetParentId);

                if ($targetQuestionTitle)
                {
                        $clone->setTitle($targetQuestionTitle);
                }

                $clone->saveToDb();
                
                if($this->gap_combinations_exists)
                {
                        $this->copyGapCombination($sourceQuestionId, $clone->getId());
                }
                // copy question page content
                $clone->copyPageOfQuestion($sourceQuestionId);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($sourceQuestionId);

                $clone->onCopy($sourceParentId, $sourceQuestionId, $clone->getObjId(), $clone->getId());

                return $clone->id;
        }
        
        function copyGapCombination($orgID, $newID)
        {
                $assClozeGapCombinationObj = new assClozeGapCombination();
                $array = $assClozeGapCombinationObj->loadFromDb($orgID);
                $assClozeGapCombinationObj->importGapCombinationToDb($newID , $array);
        }

        function updateClozeTextFromGaps()
        {
                $output = $this->getClozeText();
                foreach ($this->getGaps() as $gap_index => $gap)
                {
                        $answers = array();
                        foreach ($gap->getItemsRaw() as $item)
                        {
                                array_push($answers, str_replace(",", "\\,", $item->getAnswerText()));
                        }
                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "[_gap]" . $this->prepareTextareaOutput(join(",", $answers), true) . "[/_gap]", $output, 1);
                }
                $output = str_replace("_gap]", "gap]", $output);
                $this->cloze_text = $output;
        }
        
        function deleteAnswerText($gap_index, $answer_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        if ($this->gaps[$gap_index]->getItemCount() == 1)
                        {
                                // this is the last answer text => remove the gap
                                $this->deleteGap($gap_index);
                        }
                        else
                        {
                                // remove the answer text
                                $this->gaps[$gap_index]->deleteItem($answer_index);
                                $this->updateClozeTextFromGaps();
                        }
                }
        }

        function deleteGap($gap_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $output = $this->getClozeText();
                        foreach ($this->getGaps() as $replace_gap_index => $gap)
                        {
                                $answers = array();
                                foreach ($gap->getItemsRaw() as $item)
                                {
                                        array_push($answers, str_replace(",", "\\,", $item->getAnswerText()));
                                }
                                if ($replace_gap_index == $gap_index)
                                {
                                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "", $output, 1);
                                }
                                else
                                {
                                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "[_gap]" . join(",", $answers) . "[/_gap]", $output, 1);
                                }
                        }
                        $output = str_replace("_gap]", "gap]", $output);
                        $this->cloze_text = $output;
                        unset($this->gaps[$gap_index]);
                        $this->gaps = array_values($this->gaps);
                }
        }

        function getTextgapPoints($a_original, $a_entered, $max_points)
        {
                include_once "./Services/Utilities/classes/class.ilStr.php";
                $result = 0;
                $gaprating = $this->getTextgapRating();
                switch ($gaprating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                                if (strcmp(ilStr::strToLower($a_original), ilStr::strToLower($a_entered)) == 0) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_CASESENSITIVE:
                                if (strcmp($a_original, $a_entered) == 0) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN1:
                                if (levenshtein($a_original, $a_entered) <= 1) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN2:
                                if (levenshtein($a_original, $a_entered) <= 2) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN3:
                                if (levenshtein($a_original, $a_entered) <= 3) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN4:
                                if (levenshtein($a_original, $a_entered) <= 4) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN5:
                                if (levenshtein($a_original, $a_entered) <= 5) $result = $max_points;
                                break;
                }
                return $result;
        }
        
        function getNumericgapPoints($a_original, $a_entered, $max_points, $lowerBound, $upperBound)
        {
// fau: fixGapFormula - check entered value by evalMath
//              if( ! $this->checkForValidFormula($a_entered) )
//              {
//                      return 0;
//              }

                include_once "./Services/Math/classes/class.EvalMath.php";
                $eval = new EvalMath();
                $eval->suppress_errors = TRUE;
                $result = 0;

                if ($eval->e($a_entered) === FALSE)
                {
                        return 0;
                }
                elseif (($eval->e($lowerBound) !== FALSE) && ($eval->e($upperBound) !== FALSE))
// fau.
                {
                        if (($eval->e($a_entered) >= $eval->e($lowerBound)) && ($eval->e($a_entered) <= $eval->e($upperBound))) $result = $max_points;
                }
                else if ($eval->e($lowerBound) !== FALSE)
                {
                        if (($eval->e($a_entered) >= $eval->e($lowerBound)) && ($eval->e($a_entered) <= $eval->e($a_original))) $result = $max_points;
                }
                else if ($eval->e($upperBound) !== FALSE)
                {
                        if (($eval->e($a_entered) >= $eval->e($a_original)) && ($eval->e($a_entered) <= $eval->e($upperBound))) $result = $max_points;
                }
                else
                {
                        if ($eval->e($a_entered) == $eval->e($a_original)) $result = $max_points;
                }
                return $result;
        }

        public function checkForValidFormula($value)
        {
                return preg_match("/^-?(\\d*)(,|\\.|\\/){0,1}(\\d*)$/", $value, $matches);
        }
        public function calculateReachedPoints($active_id, $pass = NULL, $authorized = true, $returndetails = FALSE)
        {
                global $ilDB;
                
                if (is_null($pass))
                {
                        $pass = $this->getSolutionMaxPass($active_id);
                }

                $result = $this->getCurrentSolutionResultSet($active_id, $pass, $authorized);
                $user_result = array();
                while ($data = $ilDB->fetchAssoc($result)) 
                {
                        if (strcmp($data["value2"], "") != 0)
                        {
                                $user_result[$data["value1"]] = array(
                                        "gap_id" => $data["value1"],
                                        "value" => $data["value2"]
                                );
                        }
                }
                
                ksort($user_result); // this is required when identical scoring for same solutions is disabled

                if ($returndetails)
                {
                        $detailed = array();
                        $this->calculateReachedPointsForSolution($user_result, $detailed);
                        return $detailed;
                }
                
                return $this->calculateReachedPointsForSolution($user_result);
        }
        
        protected function isValidNumericSubmitValue($submittedValue)
        {
                if( is_numeric($submittedValue) )
                {
                        return true;
                }
                
                if( preg_match('/^[-+]{0,1}\d+\/\d+$/', $submittedValue) )
                {
                        return true;
                }
                
                return false;
        }
        
        public function validateSolutionSubmit()
        {
                foreach($this->getSolutionSubmit() as $gapIndex => $value)
                {
                        $gap = $this->getGap($gapIndex);
                        
                        if($gap->getType() != CLOZE_NUMERIC)
                        {
                                continue;
                        }
                        
                        if( !$this->isValidNumericSubmitValue($value) )
                        {
                                ilUtil::sendFailure($this->lng->txt("err_no_numeric_value"), true);
                                return false;
                        }
                }
                
                return true;
        }
        
        public function getSolutionSubmit()
        {
                $solutionSubmit = array();
                
                foreach ($_POST as $key => $value)
                {
                        if (preg_match("/^gap_(\d+)/", $key, $matches))
                        {
                                $value = ilUtil::stripSlashes($value, FALSE);
                                if (strlen($value))
                                {
                                        $gap = $this->getGap($matches[1]);
                                        if (is_object($gap))
                                        {
                                                if (!(($gap->getType() == CLOZE_SELECT) && ($value == -1)))
                                                {
                                                        if ($gap->getType() == CLOZE_NUMERIC)
                                                        {
                                                                $value = str_replace(",", ".", $value);
                                                        }
                                                        $solutionSubmit[trim($matches[1])] = $value;
                                                }
                                        }
                                }
                        }
                }
                
                return $solutionSubmit;
        }
        
        public function saveWorkingData($active_id, $pass = NULL, $authorized = true) 
        {
                global $ilDB;
                global $ilUser;
                if (is_null($pass))
                {
                        include_once "./Modules/Test/classes/class.ilObjTest.php";
                        $pass = ilObjTest::_getPass($active_id);
                }
                
                $this->getProcessLocker()->requestUserSolutionUpdateLock();

                $affectedRows = $this->removeCurrentSolution($active_id, $pass, $authorized);

                $entered_values = 0;
                
                foreach($this->getSolutionSubmit() as $val1 => $val2)
                {
                        $value = trim(ilUtil::stripSlashes($val2, FALSE));
                        if (strlen($value))
                        {
                                $gap = $this->getGap(trim(ilUtil::stripSlashes($val1)));
                                if (is_object($gap))
                                {
                                        if (!(($gap->getType() == CLOZE_SELECT) && ($value == -1)))
                                        {
                                                $affectedRows = $this->saveCurrentSolution($active_id,$pass, $val1, $value, $authorized);
                                                $entered_values++;
                                        }
                                }
                        }
                }

                $this->getProcessLocker()->releaseUserSolutionUpdateLock();

                if ($entered_values)
                {
                        include_once ("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
                        if (ilObjAssessmentFolder::_enabledAssessmentLogging())
                        {
                                $this->logAction($this->lng->txtlng("assessment", "log_user_entered_values", ilObjAssessmentFolder::_getLogLanguage()), $active_id, $this->getId());
                        }
                }
                else
                {
                        include_once ("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
                        if (ilObjAssessmentFolder::_enabledAssessmentLogging())
                        {
                                $this->logAction($this->lng->txtlng("assessment", "log_user_not_entered_values", ilObjAssessmentFolder::_getLogLanguage()), $active_id, $this->getId());
                        }
                }
                
                return TRUE;
        }
        
        protected function reworkWorkingData($active_id, $pass, $obligationsAnswered)
        {
                // nothing to rework!
        }

        function getQuestionType()
        {
                return "assClozeTest";
        }

        function getTextgapRating()
        {
                return $this->textgap_rating;
        }

        function setTextgapRating($a_textgap_rating)
        {
                switch ($a_textgap_rating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                        case TEXTGAP_RATING_CASESENSITIVE:
                        case TEXTGAP_RATING_LEVENSHTEIN1:
                        case TEXTGAP_RATING_LEVENSHTEIN2:
                        case TEXTGAP_RATING_LEVENSHTEIN3:
                        case TEXTGAP_RATING_LEVENSHTEIN4:
                        case TEXTGAP_RATING_LEVENSHTEIN5:
                                $this->textgap_rating = $a_textgap_rating;
                                break;
                        default:
                                $this->textgap_rating = TEXTGAP_RATING_CASEINSENSITIVE;
                                break;
                }
        }

        function getIdenticalScoring()
        {
                return ($this->identical_scoring) ? 1 : 0;
        }

        function setIdenticalScoring($a_identical_scoring)
        {
                $this->identical_scoring = ($a_identical_scoring) ? 1 : 0;
        }

        function getAdditionalTableName()
        {
                return "qpl_qst_cloze";
        }

        function getAnswerTableName()
        {
                return array("qpl_a_cloze",'qpl_a_cloze_combi_res');
        }
        
        function setFixedTextLength($a_text_len)
        {
                $this->fixedTextLength = $a_text_len;
        }
        
        function getFixedTextLength()
        {
                return $this->fixedTextLength;
        }

        function getMaximumGapPoints($gap_index) 
        {
                $points = 0;
                $gap_max_points = 0;
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $gap =& $this->gaps[$gap_index];
                        foreach ($gap->getItems($this->getShuffler()) as $answer) 
                        {
                                if ($answer->getPoints() > $gap_max_points)
                                {
                                        $gap_max_points = $answer->getPoints();
                                }
                        }
                        $points += $gap_max_points;
                }
                return $points;
        }

        function getRTETextWithMediaObjects()
        {
                return parent::getRTETextWithMediaObjects() . $this->getClozeText();
        }
        function getGapCombinationsExists()
        {
                return $this->gap_combinations_exists;
        }

        function getGapCombinations()
        {
                return $this->gap_combinations;
        }

        function setGapCombinationsExists($value)
        {
                $this->gap_combinations_exists = $value;
        }

        function setGapCombinations($value)
        {
                $this->gap_combinations = $value;
        }
        public function setExportDetailsXLS(&$worksheet, $startrow, $active_id, $pass, &$format_title, &$format_bold)
        {
                include_once ("./Services/Excel/classes/class.ilExcelUtils.php");
                $solution = $this->getSolutionValues($active_id, $pass);
                $worksheet->writeString($startrow, 0, ilExcelUtils::_convert_text($this->lng->txt($this->getQuestionType())), $format_title);
                $worksheet->writeString($startrow, 1, ilExcelUtils::_convert_text($this->getTitle()), $format_title);
                $i = 1;
                foreach ($this->getGaps() as $gap_index => $gap)
                {
                        $worksheet->writeString($startrow + $i, 0, ilExcelUtils::_convert_text($this->lng->txt("gap") . " $i"), $format_bold);
                        $checked = FALSE;
                        foreach ($solution as $solutionvalue)
                        {
                                if ($gap_index == $solutionvalue["value1"])
                                {
                                        switch ($gap->getType())
                                        {
                                                case CLOZE_SELECT:
                                                        $worksheet->writeString($startrow + $i, 1, $gap->getItem($solutionvalue["value2"])->getAnswertext());
                                                        break;
                                                case CLOZE_NUMERIC:
                                                case CLOZE_TEXT:
                                                        $worksheet->writeString($startrow + $i, 1, $solutionvalue["value2"]);
                                                        break;
                                        }
                                }
                        }
                        $i++;
                }
                return $startrow + $i + 1;
        }
        
        protected function lmMigrateQuestionTypeSpecificContent(ilAssSelfAssessmentMigrator $migrator)
        {
                // DO NOT USE SETTER FOR CLOZE TEXT -> SETTER DOES RECREATE GAP OBJECTS without having gap type info ^^
                //$this->setClozeText( $migrator->migrateToLmContent($this->getClozeText()) );
                $this->cloze_text = $migrator->migrateToLmContent($this->getClozeText());
                // DO NOT USE SETTER FOR CLOZE TEXT -> SETTER DOES RECREATE GAP OBJECTS without having gap type info ^^
        }
        
        public function toJSON()
        {
                include_once("./Services/RTE/classes/class.ilRTE.php");
                $result = array();
                $result['id'] = (int) $this->getId();
                $result['type'] = (string) $this->getQuestionType();
                $result['title'] = (string) $this->getTitle();
                $result['question'] =  $this->formatSAQuestion($this->getQuestion());
                $result['clozetext'] =  $this->formatSAQuestion($this->getClozeText());
                $result['nr_of_tries'] = (int) $this->getNrOfTries();
                $result['shuffle'] = (bool) $this->getShuffle();
                $result['feedback'] = array(
                        'onenotcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), false)),
                        'allcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), true))
                );
                
                $gaps = array();
                foreach ($this->getGaps() as $key => $gap)
                {
                        $items = array();
                        foreach ($gap->getItems($this->getShuffler()) as $item)
                        {                               
                                $jitem = array();
                                $jitem['points'] = $item->getPoints();
                                $jitem['value'] = $this->formatSAQuestion($item->getAnswertext());
                                $jitem['order'] = $item->getOrder();
                                if ($gap->getType() == CLOZE_NUMERIC)
                                {
                                        $jitem['lowerbound'] = $item->getLowerBound();
                                        $jitem['upperbound'] = $item->getUpperBound();
                                }
                                else
                                {
                                        $jitem['value'] = trim($jitem['value']);
                                }
                                array_push($items, $jitem);
                        }

                        if( $gap->getGapSize() && ($gap->getType() == CLOZE_TEXT || $gap->getType() == CLOZE_NUMERIC) )
                        {
                                $jgap['size'] = $gap->getGapSize();
                        }

                        $jgap['shuffle'] = $gap->getShuffle();
                        $jgap['type'] = $gap->getType();
                        $jgap['item'] = $items;
                        
                        array_push($gaps, $jgap);
                }
                $result['gaps'] = $gaps;
                $mobs = ilObjMediaObject::_getMobsOfObject("qpl:html", $this->getId());
                $result['mobs'] = $mobs;
                return json_encode($result);
        }

        public function getOperators($expression)
        {
                require_once "./Modules/TestQuestionPool/classes/class.ilOperatorsExpressionMapping.php";
                return ilOperatorsExpressionMapping::getOperatorsByExpression($expression);
        }

        public function getExpressionTypes()
        {
                return array(
                        iQuestionCondition::PercentageResultExpression,
                        iQuestionCondition::NumericResultExpression,
                        iQuestionCondition::NumberOfResultExpression,
                        iQuestionCondition::StringResultExpression,
                        iQuestionCondition::EmptyAnswerExpression,
                );
        }

        public function getUserQuestionResult($active_id, $pass)
        {
                global $ilDB;
                $result = new ilUserQuestionResult($this, $active_id, $pass);

                $maxStep = $this->lookupMaxStep($active_id, $pass);

                if( $maxStep !== null )
                {
                        $data = $ilDB->queryF(
                                "
                                SELECT sol.value1+1 as val, sol.value2, cloze.cloze_type
                                FROM tst_solutions sol
                                INNER JOIN qpl_a_cloze cloze ON cloze.gap_id = value1 AND cloze.question_fi = sol.question_fi
                                WHERE sol.active_fi = %s AND sol.pass = %s AND sol.question_fi = %s AND sol.step = %s
                                GROUP BY sol.solution_id, sol.value1+1, sol.value2, cloze.cloze_type
                                ",
                                array("integer", "integer", "integer","integer"),
                                array($active_id, $pass, $this->getId(), $maxStep)
                        );
                }
                else
                {
                        $data = $ilDB->queryF(
                                "
                                SELECT sol.value1+1 as val, sol.value2, cloze.cloze_type
                                FROM tst_solutions sol
                                INNER JOIN qpl_a_cloze cloze ON cloze.gap_id = value1 AND cloze.question_fi = sol.question_fi
                                WHERE sol.active_fi = %s AND sol.pass = %s AND sol.question_fi = %s
                                GROUP BY sol.solution_id, sol.value1+1, sol.value2, cloze.cloze_type
                                ",
                                array("integer", "integer", "integer"),
                                array($active_id, $pass, $this->getId())
                        );
                }
                
                while($row = $ilDB->fetchAssoc($data))
                {
                        if($row["cloze_type"] == 1)
                        {
                                $row["value2"]++;
                        }
                        $result->addKeyValue($row["val"], $row["value2"]);
                }

                $points = $this->calculateReachedPoints($active_id, $pass);
                $max_points = $this->getMaximumPoints();

                $result->setReachedPercentage(($points/$max_points) * 100);

                return $result;
        }

        public function getAvailableAnswerOptions($index = null)
        {
                if($index !== null)
                {
                        return $this->getGap($index);
                }
                else
                {
                        return $this->getGaps();
                }
        }

        public function calculateCombinationResult($user_result)
        {
                $points = 0;
                
                $assClozeGapCombinationObj = new assClozeGapCombination();
                
                if($assClozeGapCombinationObj->combinationExistsForQid($this->getId()))
                {
                        $combinations_for_question      = $assClozeGapCombinationObj->getCleanCombinationArray($this->getId());
                        $gap_answers                    = array();
                        $gap_used_in_combination        = array();
                        foreach($user_result as $user_result_build_list)
                        {
                                if(is_array($user_result_build_list))
                                {
                                        $gap_answers[$user_result_build_list['gap_id']] = $user_result_build_list['value'];
                                }
                        }

                        foreach($combinations_for_question as $combination)
                        {

                                foreach($combination as $row_key => $row_answers)
                                {
                                        $combination_fulfilled = true;
                                        $points_for_combination = $row_answers['points'];
                                        foreach($row_answers as $gap_key => $combination_gap_answer)
                                        {
                                                if($gap_key !== 'points')
                                                {
                                                        $gap_used_in_combination[$gap_key]= $gap_key;
                                                }
                                                if($combination_fulfilled && array_key_exists($gap_key, $gap_answers))
                                                {
                                                        switch($combination_gap_answer['type'])
                                                        {
                                                                case CLOZE_TEXT:
                                                                        $is_text_gap_correct = $this->getTextgapPoints($gap_answers[$gap_key], $combination_gap_answer['answer'], 1);
                                                                        if($is_text_gap_correct != 1)
                                                                        {
                                                                                $combination_fulfilled = false;
                                                                        }
                                                                        break;
                                                                case CLOZE_SELECT:
                                                                        $answer     = $this->gaps[$gap_key]->getItem($gap_answers[$gap_key]);
                                                                        $answertext = $answer->getAnswertext();
                                                                        if($answertext != $combination_gap_answer['answer'])
                                                                        {
                                                                                $combination_fulfilled = false;
                                                                        }
                                                                        break;
                                                                case CLOZE_NUMERIC:
                                                                        $answer = $this->gaps[$gap_key]->getItem(0);
                                                                        if($combination_gap_answer['answer'] != 'out_of_bound')
                                                                        {
                                                                                $is_numeric_gap_correct = $this->getNumericgapPoints($answer->getAnswertext(), $gap_answers[$gap_key], 1, $answer->getLowerBound(), $answer->getUpperBound());
                                                                                if($is_numeric_gap_correct != 1)
                                                                                {
                                                                                        $combination_fulfilled = false;
                                                                                }
                                                                        }
                                                                        else
                                                                        {
                                                                                $wrong_is_the_new_right = $this->getNumericgapPoints($answer->getAnswertext(), $gap_answers[$gap_key], 1, $answer->getLowerBound(), $answer->getUpperBound());
                                                                                if($wrong_is_the_new_right == 1)
                                                                                {
                                                                                        $combination_fulfilled = false;
                                                                                }
                                                                        }
                                                                        break;
                                                        }
                                                }
                                                else
                                                {
                                                        if($gap_key !== 'points')
                                                        {
                                                                $combination_fulfilled = false;
                                                        }
                                                }
                                        }
                                        if($combination_fulfilled)
                                        {
                                                $points += $points_for_combination;
                                        }
                                }
                        }
                }
                return array($points, $gap_used_in_combination);
        }
        protected function calculateReachedPointsForSolution($user_result, &$detailed = null)
        {
                if($detailed === null)
                {
                        $detailed = array();
                }

                $assClozeGapCombinationObj = new assClozeGapCombination();
                $combinations[1] = array();
                if($assClozeGapCombinationObj->combinationExistsForQid($this->getId()))
                {
                        $combinations = $this->calculateCombinationResult($user_result);
                        $points = $combinations[0];
                }
                $counter          = 0;
                $solution_values_text = array(); // for identical scoring checks
                $solution_values_select = array(); // for identical scoring checks
                $solution_values_numeric = array(); // for identical scoring checks
                foreach($user_result as $gap_id => $value)
                {
                        if(is_string($value))
                        {
                                $value = array("value" => $value);
                        }
                        
                        if(array_key_exists($gap_id, $this->gaps) && !array_key_exists ($gap_id, $combinations[1]))
                        {
                                switch($this->gaps[$gap_id]->getType())
                                {
                                        case CLOZE_TEXT:
                                                $gappoints = 0;
                                                for($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++)
                                                {
                                                        $answer = $this->gaps[$gap_id]->getItem($order);
                                                        $gotpoints = $this->getTextgapPoints($answer->getAnswertext(), $value["value"], $answer->getPoints());
                                                        if($gotpoints > $gappoints) $gappoints = $gotpoints;
                                                }
                                                if(!$this->getIdenticalScoring())
                                                {
                                                        // check if the same solution text was already entered
                                                        if((in_array($value["value"], $solution_values_text)) && ($gappoints > 0))
                                                        {
                                                                $gappoints = 0;
                                                        }
                                                }
                                                $points += $gappoints;
                                                $detailed[$gap_id] = array("points" => $gappoints, "best" => ($this->getMaximumGapPoints($gap_id) == $gappoints) ? TRUE : FALSE, "positive" => ($gappoints > 0) ? TRUE : FALSE);
                                                array_push($solution_values_text, $value["value"]);
                                                break;
                                        case CLOZE_NUMERIC:
                                                $gappoints = 0;
                                                for($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++)
                                                {
                                                        $answer = $this->gaps[$gap_id]->getItem($order);
                                                        $gotpoints = $this->getNumericgapPoints($answer->getAnswertext(), $value["value"], $answer->getPoints(), $answer->getLowerBound(), $answer->getUpperBound());
                                                        if($gotpoints > $gappoints) $gappoints = $gotpoints;
                                                }
                                                if(!$this->getIdenticalScoring())
                                                {
                                                        // check if the same solution value was already entered
                                                        include_once "./Services/Math/classes/class.EvalMath.php";
                                                        $eval = new EvalMath();
                                                        $eval->suppress_errors = TRUE;
                                                        $found_value = FALSE;
                                                        foreach($solution_values_numeric as $solval)
                                                        {
                                                                if($eval->e($solval) == $eval->e($value["value"]))
                                                                {
                                                                        $found_value = TRUE;
                                                                }
                                                        }
                                                        if($found_value && ($gappoints > 0))
                                                        {
                                                                $gappoints = 0;
                                                        }
                                                }
                                                $points += $gappoints;
                                                $detailed[$gap_id] = array("points" => $gappoints, "best" => ($this->getMaximumGapPoints($gap_id) == $gappoints) ? TRUE : FALSE, "positive" => ($gappoints > 0) ? TRUE : FALSE);
                                                array_push($solution_values_numeric, $value["value"]);
                                                break;
                                        case CLOZE_SELECT:
                                                if($value["value"] >= 0)
                                                {
                                                        for($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++)
                                                        {
                                                                $answer = $this->gaps[$gap_id]->getItem($order);
                                                                if($value["value"] == $answer->getOrder())
                                                                {
                                                                        $answerpoints = $answer->getPoints();
                                                                        if(!$this->getIdenticalScoring())
                                                                        {
                                                                                // check if the same solution value was already entered
                                                                                if((in_array($answer->getAnswertext(), $solution_values_select)) && ($answerpoints > 0))
                                                                                {
                                                                                        $answerpoints = 0;
                                                                                }
                                                                        }
                                                                        $points += $answerpoints;
                                                                        $detailed[$gap_id] = array("points" => $answerpoints, "best" => ($this->getMaximumGapPoints($gap_id) == $answerpoints) ? TRUE : FALSE, "positive" => ($answerpoints > 0) ? TRUE : FALSE);
                                                                        array_push($solution_values_select, $answer->getAnswertext());
                                                                }
                                                        }
                                                }
                                                break;
                                }
                        }
                }
                
                return $points;
        }

        public function calculateReachedPointsFromPreviewSession(ilAssQuestionPreviewSession $previewSession)
        {
                $userSolution = array();
                
                foreach($previewSession->getParticipantsSolution() as $key => $val)
                {
                        $userSolution[] = array('gap_id' => $key, 'value' => $val);
                }
                
                return $this->calculateReachedPointsForSolution($userSolution);
        }
}