class.assErrorText.php

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<?php

require_once './Modules/Test/classes/inc.AssessmentConstants.php';

class assErrorText extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable, iQuestionCondition
{
    protected const ERROR_TYPE_WORD = 1;
    protected const ERROR_TYPE_PASSAGE = 2;
    protected const DEFAULT_TEXT_SIZE = 100.0;
    protected const ERROR_MAX_LENGTH = 150;

    protected const PARAGRAPH_SPLIT_REGEXP = '/[\n\r]+/';
    protected const WORD_SPLIT_REGEXP = '/\s+/';
    protected const FIND_PUNCTUATION_REGEXP = '/\p{P}/';
    protected const ERROR_WORD_MARKER = '#';
    protected const ERROR_PARAGRAPH_DELIMITERS = [
        'start' => '((',
        'end' => '))'
    ];

    protected string $errortext = '';
    protected array $parsed_errortext = [];
    protected array $errordata = [];
    protected float $textsize;
    protected ?float $points_wrong;

    public function __construct(
        $title = '',
        $comment = '',
        $author = '',
        $owner = -1,
        $question = ''
    ) {
        parent::__construct($title, $comment, $author, $owner, $question);
        $this->textsize = self::DEFAULT_TEXT_SIZE;
    }

    public function isComplete(): bool
    {
        if (mb_strlen($this->title)
            && ($this->author)
            && ($this->question)
            && ($this->getMaximumPoints() > 0)) {
            return true;
        } else {
            return false;
        }
    }

    public function saveToDb($original_id = ""): void
    {
        if ($original_id == '') {
            $this->saveQuestionDataToDb();
        } else {
            $this->saveQuestionDataToDb($original_id);
        }

        $this->saveAdditionalQuestionDataToDb();
        $this->saveAnswerSpecificDataToDb();
        parent::saveToDb();
    }

    public function saveAnswerSpecificDataToDb()
    {
        $this->db->manipulateF(
            "DELETE FROM qpl_a_errortext WHERE question_fi = %s",
            ['integer'],
            [$this->getId()]
        );

        $sequence = 0;
        foreach ($this->errordata as $error) {
            $next_id = $this->db->nextId('qpl_a_errortext');
            $this->db->manipulateF(
                "INSERT INTO qpl_a_errortext (answer_id, question_fi, text_wrong, text_correct, points, sequence, position) VALUES (%s, %s, %s, %s, %s, %s, %s)",
                ['integer', 'integer', 'text', 'text', 'float', 'integer', 'integer'],
                [
                    $next_id,
                    $this->getId(),
                    $error->getTextWrong(),
                    $error->getTextCorrect(),
                    $error->getPoints(),
                    $sequence++,
                    $error->getPosition()
                ]
            );
        }
    }

    public function saveAdditionalQuestionDataToDb()
    {
        $this->db->manipulateF(
            "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
            ["integer"],
            [$this->getId()]
        );

        $this->db->manipulateF(
            "INSERT INTO " . $this->getAdditionalTableName() . " (question_fi, errortext, parsed_errortext, textsize, points_wrong) VALUES (%s, %s, %s, %s, %s)",
            ["integer", "text", "text", "float", "float"],
            [
                $this->getId(),
                $this->getErrorText(),
                json_encode($this->getParsedErrorText()),
                $this->getTextSize(),
                $this->getPointsWrong()
            ]
        );
    }

    public function loadFromDb($question_id): void
    {
        $db_question = $this->db->queryF(
            "SELECT qpl_questions.*, " . $this->getAdditionalTableName() . ".* FROM qpl_questions LEFT JOIN " . $this->getAdditionalTableName() . " ON " . $this->getAdditionalTableName() . ".question_fi = qpl_questions.question_id WHERE qpl_questions.question_id = %s",
            ["integer"],
            [$question_id]
        );
        if ($db_question->numRows() === 1) {
            $data = $this->db->fetchAssoc($db_question);
            $this->setId($question_id);
            $this->setObjId($data["obj_fi"]);
            $this->setTitle((string) $data["title"]);
            $this->setComment((string) $data["description"]);
            $this->setOriginalId($data["original_id"]);
            $this->setNrOfTries($data['nr_of_tries']);
            $this->setAuthor($data["author"]);
            $this->setPoints($data["points"]);
            $this->setOwner($data["owner"]);
            $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc((string) $data["question_text"], 1));
            $this->setErrorText((string) $data["errortext"]);
            $this->setParsedErrorText(json_decode($data['parsed_errortext'], true) ?? []);
            $this->setTextSize($data["textsize"]);
            $this->setPointsWrong($data["points_wrong"]);

            try {
                $this->setLifecycle(ilAssQuestionLifecycle::getInstance($data['lifecycle']));
            } catch (ilTestQuestionPoolInvalidArgumentException $e) {
                $this->setLifecycle(ilAssQuestionLifecycle::getDraftInstance());
            }

            try {
                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
            } catch (ilTestQuestionPoolException $e) {
            }
        }

        $db_error_text = $this->db->queryF(
            "SELECT * FROM qpl_a_errortext WHERE question_fi = %s ORDER BY sequence ASC",
            ['integer'],
            [$question_id]
        );
        if ($db_error_text->numRows() > 0) {
            while ($data = $this->db->fetchAssoc($db_error_text)) {
                $this->errordata[] = new assAnswerErrorText(
                    (string) $data['text_wrong'],
                    (string) $data['text_correct'],
                    (float) $data['points'],
                    $data['position']
                );
            }
        }

        $this->correctDataAfterParserUpdate();

        parent::loadFromDb($question_id);
    }

    private function correctDataAfterParserUpdate(): void
    {
        if ($this->getErrorText() === '') {
            return;
        }
        $needs_finalizing = false;
        if ($this->getParsedErrorText() === []) {
            $needs_finalizing = true;
            $this->parseErrorText();
        }

        if (isset($this->errordata[0])
            && $this->errordata[0]->getPosition() === null) {
            foreach ($this->errordata as $key => $error) {
                $this->errordata[$key] = $this->addPositionToErrorAnswer($error);
            }
            $this->saveAnswerSpecificDataToDb();
        }

        if ($needs_finalizing) {
            $this->completeParsedErrorTextFromErrorData();
            $this->saveAdditionalQuestionDataToDb();
        }
    }

    public function duplicate(bool $for_test = true, string $title = "", string $author = "", string $owner = "", $testObjId = null): int
    {
        if ($this->id <= 0) {
            // The question has not been saved. It cannot be duplicated
            return -1;
        }
        // duplicate the question in database
        $this_id = $this->getId();
        $thisObjId = $this->getObjId();

        $clone = $this;
        $original_id = assQuestion::_getOriginalId($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();
        }
        // 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->id;
    }

    public function copyObject($target_questionpool_id, $title = ""): int
    {
        if ($this->getId() <= 0) {
            throw new RuntimeException('The question has not been saved. It cannot be duplicated');
        }
        // duplicate the question in database

        $thisId = $this->getId();
        $thisObjId = $this->getObjId();

        $clone = $this;
        $original_id = assQuestion::_getOriginalId($this->id);
        $clone->id = -1;
        $clone->setObjId($target_questionpool_id);
        if ($title) {
            $clone->setTitle($title);
        }
        $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->id;
    }

    public function createNewOriginalFromThisDuplicate($targetParentId, $targetQuestionTitle = ""): int
    {
        if ($this->getId() <= 0) {
            throw new RuntimeException('The question has not been saved. It cannot be duplicated');
        }

        $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();
        // 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;
    }

    public function getMaximumPoints(): float
    {
        $maxpoints = 0.0;
        foreach ($this->errordata as $error) {
            if ($error->getPoints() > 0) {
                $maxpoints += $error->getPoints();
            }
        }
        return $maxpoints;
    }

    public function calculateReachedPoints($active_id, $pass = null, $authorizedSolution = true, $returndetails = false): float
    {
        if ($returndetails) {
            throw new ilTestException('return details not implemented for ' . __METHOD__);
        }

        /* First get the positions which were selected by the user. */
        $positions = [];
        if (is_null($pass)) {
            $pass = $this->getSolutionMaxPass($active_id);
        }
        $result = $this->getCurrentSolutionResultSet($active_id, $pass, $authorizedSolution);

        while ($row = $this->db->fetchAssoc($result)) {
            $positions[] = $row['value1'];
        }
        $points = $this->getPointsForSelectedPositions($positions);
        return $points;
    }

    public function calculateReachedPointsFromPreviewSession(ilAssQuestionPreviewSession $preview_session)
    {
        $reached_points = $this->getPointsForSelectedPositions($preview_session->getParticipantsSolution() ?? []);
        $reached_points = $this->deductHintPointsFromReachedPoints($preview_session, $reached_points);
        return $this->ensureNonNegativePoints($reached_points);
    }

    public function saveWorkingData($active_id, $pass = null, $authorized = true): bool
    {
        if (is_null($pass)) {
            $pass = ilObjTest::_getPass($active_id);
        }

        $selected = $this->getAnswersFromRequest();
        $this->getProcessLocker()->executeUserSolutionUpdateLockOperation(
            function () use ($selected, $active_id, $pass, $authorized) {
                $this->removeCurrentSolution($active_id, $pass, $authorized);

                foreach ($selected as $position) {
                    $this->saveCurrentSolution($active_id, $pass, $position, null, $authorized);
                }
            }
        );

        if (ilObjAssessmentFolder::_enabledAssessmentLogging()) {
            $this->logUserAction($selected !== [], (int) $active_id);
        }

        return true;
    }

    public function savePreviewData(ilAssQuestionPreviewSession $previewSession): void
    {
        $selection = $this->getAnswersFromRequest();
        $previewSession->setParticipantsSolution($selection);
    }

    private function logUserAction(bool $user_entered_values, int $active_id): void
    {
        $log_text = $this->lng->txtlng(
            "assessment",
            $user_entered_values ? 'log_user_entered_values' : 'log_user_not_entered_values',
            ilObjAssessmentFolder::_getLogLanguage()
        );
        assQuestion::logAction($log_text, $active_id, $this->getId());
    }

    private function getAnswersFromRequest(): array
    {
        if (mb_strlen($_POST["qst_" . $this->getId()])) {
            return explode(',', $_POST["qst_{$this->getId()}"]);
        }

        return [];
    }

    public function getQuestionType(): string
    {
        return 'assErrorText';
    }

    public function getAdditionalTableName(): string
    {
        return 'qpl_qst_errortext';
    }

    public function getAnswerTableName(): string
    {
        return 'qpl_a_errortext';
    }

    public function setExportDetailsXLS(ilAssExcelFormatHelper $worksheet, int $startrow, int $active_id, int $pass): int
    {
        parent::setExportDetailsXLS($worksheet, $startrow, $active_id, $pass);

        $i = 0;
        $selections = [];
        $solutions = $this->getSolutionValues($active_id, $pass);
        if (is_array($solutions)) {
            foreach ($solutions as $solution) {
                $selections[] = $solution['value1'];
            }
        }
        $errortext = $this->createErrorTextExport($selections);
        $i++;
        $worksheet->setCell($startrow + $i, 2, $errortext);
        $i++;

        return $startrow + $i + 1;
    }

    public function fromXML($item, int $questionpool_id, ?int $tst_id, &$tst_object, int &$question_counter, array $import_mapping, array &$solutionhints = []): array
    {
        $import = new assErrorTextImport($this);
        return $import->fromXML($item, $questionpool_id, $tst_id, $tst_object, $question_counter, $import_mapping);
    }

    public function toXML($a_include_header = true, $a_include_binary = true, $a_shuffle = false, $test_output = false, $force_image_references = false): string
    {
        $export = new assErrorTextExport($this);
        return $export->toXML($a_include_header, $a_include_binary, $a_shuffle, $test_output, $force_image_references);
    }

    public function setErrorsFromParsedErrorText(): void
    {
        $current_error_data = $this->getErrorData();
        $this->errordata = [];

        $has_too_long_errors = false;
        foreach ($this->getParsedErrorText() as $paragraph) {
            foreach ($paragraph as $position => $word) {
                if ($word['error_type'] === 'in_passage'
                    || $word['error_type'] === 'passage_end'
                    || $word['error_type'] === 'none') {
                    continue;
                }

                $text_wrong = $word['text_wrong'];
                if (mb_strlen($text_wrong) > self::ERROR_MAX_LENGTH) {
                    $has_too_long_errors = true;
                    continue;
                }

                list($text_correct, $points) =
                    $this->getAdditionalInformationFromExistingErrorDataByErrorText($current_error_data, $text_wrong);
                $this->errordata[] = new assAnswerErrorText($text_wrong, $text_correct, $points, $position);
            }
        }

        if ($has_too_long_errors) {
            $this->tpl->setOnScreenMessage(
                'failure',
                $this->lng->txt('qst_error_text_too_long')
            );
        }
    }

    private function addPositionToErrorAnswer(assAnswerErrorText $error): assAnswerErrorText
    {
        foreach ($this->getParsedErrorText() as $paragraph) {
            foreach ($paragraph as $position => $word) {
                if (isset($word['text_wrong'])
                    && ($word['text_wrong'] === $error->getTextWrong()
                        || mb_substr($word['text_wrong'], 0, -1) === $error->getTextWrong()
                            && preg_match(self::FIND_PUNCTUATION_REGEXP, mb_substr($word['text_wrong'], -1)) === 1)
                    && !array_key_exists($position, $this->generateArrayByPositionFromErrorData())
                ) {
                    return $error->withPosition($position);
                }

            }
        }

        return $error;
    }

    private function completeParsedErrorTextFromErrorData(): void
    {
        foreach ($this->errordata as $error) {
            $position = $error->getPosition();
            foreach ($this->getParsedErrorText() as $key => $paragraph) {
                if (array_key_exists($position, $paragraph)) {
                    $this->parsed_errortext[$key][$position]['text_correct'] =
                        $error->getTextCorrect();
                    $this->parsed_errortext[$key][$position]['points'] =
                        $error->getPoints();
                    break;
                }
            }
        }
    }

    public function setErrorData(array $errors): void
    {
        $this->errordata = [];

        foreach ($errors as $error) {
            $answer = $this->addPositionToErrorAnswer($error);
            $this->errordata[] = $answer;
        }
        $this->completeParsedErrorTextFromErrorData();
    }

    public function removeErrorDataWithoutPosition(): void
    {
        foreach ($this->getErrorData() as $index => $error) {
            if ($error->getPosition() === null) {
                unset($this->errordata[$index]);
            }
        }
        $this->errordata = array_values($this->errordata);
    }

    private function getAdditionalInformationFromExistingErrorDataByErrorText(
        array $current_error_data,
        string $text_wrong
    ): array {
        foreach ($current_error_data as $answer_object) {
            if (strcmp($answer_object->getTextWrong(), $text_wrong) === 0) {
                return[
                    $answer_object->getTextCorrect(),
                    $answer_object->getPoints()
                ];
            }
        }
        return ['', 0.0];
    }

    public function assembleErrorTextOutput(
        array $selections,
        bool $graphical_output = false,
        bool $show_correct_solution = false,
        bool $use_link_tags = true,
        array $correctness_icons = []
    ): string {
        $output_array = [];
        foreach ($this->getParsedErrorText() as $paragraph) {
            $array_reduce_function = fn (?string $carry, int $position)
                => $carry . $this->generateOutputStringFromPosition(
                    $position,
                    $selections,
                    $paragraph,
                    $graphical_output,
                    $show_correct_solution,
                    $use_link_tags,
                    $correctness_icons
                );
            $output_array[] = '<p>' . trim(array_reduce(array_keys($paragraph), $array_reduce_function)) . '</p>';
        }

        return implode("\n", $output_array);
    }

    private function generateOutputStringFromPosition(
        int $position,
        array $selections,
        array $paragraph,
        bool $graphical_output,
        bool $show_correct_solution,
        bool $use_link_tags,
        array $correctness_icons
    ): string {
        $text = $this->getTextForPosition($position, $paragraph, $show_correct_solution);
        if ($text === '') {
            return '';
        }
        $class = $this->getClassForPosition($position, $show_correct_solution, $selections);
        $img = $this->getCorrectnessIconForPosition(
            $position,
            $graphical_output,
            $selections,
            $correctness_icons
        );

        return ' ' . $this->getErrorTokenHtml($text, $class, $use_link_tags) . $img;
    }

    private function getTextForPosition(
        int $position,
        array $paragraph,
        bool $show_correct_solution
    ): string {
        $v = $paragraph[$position];
        if ($show_correct_solution === true
            && ($v['error_type'] === 'in_passage'
            || $v['error_type'] === 'passage_end')) {
            return '';
        }
        if ($show_correct_solution
            && ($v['error_type'] === 'passage_start'
            || $v['error_type'] === 'word')) {
            return $v['text_correct'] ?? '';
        }

        return $v['text'];
    }

    private function getClassForPosition(
        int $position,
        bool $show_correct_solution,
        array $selections
    ): string {
        if ($show_correct_solution !== true
            && in_array($position, $selections['user'])) {
            return 'ilc_qetitem_ErrorTextSelected';
        }

        if ($show_correct_solution === true
            && in_array($position, $selections['best'])) {
            return 'ilc_qetitem_ErrorTextSelected';
        }

        return 'ilc_qetitem_ErrorTextItem';
    }

    private function getCorrectnessIconForPosition(
        int $position,
        bool $graphical_output,
        array $selections,
        array $correctness_icons
    ): string {
        if ($graphical_output === true
             && (in_array($position, $selections['user']) && !in_array($position, $selections['best'])
             || !in_array($position, $selections['user']) && in_array($position, $selections['best']))) {
            return $correctness_icons['not_correct'];
        }

        if ($graphical_output === true
            && in_array($position, $selections['user']) && in_array($position, $selections['best'])) {
            return $correctness_icons['correct'];
        }

        return '';
    }

    public function createErrorTextExport(array $selections): string
    {
        if (!is_array($selections)) {
            $selections = [];
        }

        foreach ($this->getParsedErrorText() as $paragraph) {
            $array_reduce_function = function ($carry, $k) use ($paragraph, $selections) {
                $text = $paragraph[$k]['text'];
                if (in_array($k, $selections)) {
                    $text = self::ERROR_WORD_MARKER . $paragraph[$k]['text'] . self::ERROR_WORD_MARKER;
                }
                return $carry . ' ' . $text;
            };
            $output_array[] = trim(array_reduce(array_keys($paragraph), $array_reduce_function));
        }
        return implode("\n", $output_array);
    }

    public function getBestSelection($withPositivePointsOnly = true): array
    {
        $positions_array = $this->generateArrayByPositionFromErrorData();
        $selections = [];
        foreach ($positions_array as $position => $position_data) {
            if ($position === ''
                || $withPositivePointsOnly && $position_data['points'] < 1) {
                continue;
            }

            $selections[] = $position;
            if ($position_data['length'] > 1) {
                for ($i = 1;$i < $position_data['length'];$i++) {
                    $selections[] = $position + $i;
                }
            }
        }

        return $selections;
    }

    protected function getPointsForSelectedPositions(array $selected_word_positions): float
    {
        $points = 0;
        $correct_positions = $this->generateArrayByPositionFromErrorData();

        foreach ($correct_positions as $correct_position => $correct_position_data) {
            $selected_word_key = array_search($correct_position, $selected_word_positions);
            if ($selected_word_key === false) {
                continue;
            }

            if ($correct_position_data['length'] === 1) {
                $points += $correct_position_data['points'];
                unset($selected_word_positions[$selected_word_key]);
                continue;
            }

            $passage_complete = true;
            for ($i = 1;$i < $correct_position_data['length'];$i++) {
                $selected_passage_element_key = array_search($correct_position + $i, $selected_word_positions);
                if ($selected_passage_element_key === false) {
                    $passage_complete = false;
                    continue;
                }
                unset($selected_word_positions[$selected_passage_element_key]);
            }

            if ($passage_complete) {
                $points +=  $correct_position_data['points'];
                unset($selected_word_positions[$selected_word_key]);
            }
        }

        foreach ($selected_word_positions as $word_position) {
            if (!array_key_exists($word_position, $correct_positions)) {
                $points += $this->getPointsWrong();
                continue;
            }
        }

        return $points;
    }

    public function flushErrorData(): void
    {
        $this->errordata = [];
    }

    public function getErrorData(): array
    {
        return $this->errordata;
    }

    private function getErrorDataAsArrayForJS(): array
    {
        $correct_answers = [];
        foreach ($this->getErrorData() as $index => $answer_obj) {
            $correct_answers[] = [
                'answertext_wrong' => $answer_obj->getTextWrong(),
                'answertext_correct' => $answer_obj->getTextCorrect(),
                'points' => $answer_obj->getPoints(),
                'length' => $answer_obj->getLength(),
                'pos' => $this->getId() . '_' . $answer_obj->getPosition()
            ];
        }
        return $correct_answers;
    }

    public function getErrorText(): string
    {
        return $this->errortext ?? '';
    }

    public function setErrorText(?string $text): void
    {
        $this->errortext = $text ?? '';
    }

    public function getParsedErrorText(): array
    {
        return $this->parsed_errortext;
    }

    private function getParsedErrorTextForJS(): array
    {
        $answers = [];
        foreach ($this->parsed_errortext as $paragraph) {
            foreach ($paragraph as $position => $word) {
                $answers[] = [
                    'answertext' => $word['text'],
                    'order' => $this->getId() . '_' . $position
                ];
            }
            $answers[] = [
                'answertext' => '###'
            ];
        }
        array_pop($answers);

        return $answers;
    }

    public function setParsedErrorText(array $parsed_errortext): void
    {
        $this->parsed_errortext = $parsed_errortext;
    }

    public function getTextSize(): float
    {
        return $this->textsize;
    }

    public function setTextSize($a_value): void
    {
        // in self-assesment-mode value should always be set (and must not be null)
        if ($a_value === null) {
            $a_value = 100;
        }
        $this->textsize = $a_value;
    }

    public function getPointsWrong(): ?float
    {
        return $this->points_wrong;
    }

    public function setPointsWrong($a_value): void
    {
        $this->points_wrong = $a_value;
    }

    public function toJSON(): string
    {
        $result = [];
        $result['id'] = $this->getId();
        $result['type'] = (string) $this->getQuestionType();
        $result['title'] = $this->getTitleForHTMLOutput();
        $result['question'] = $this->formatSAQuestion($this->getQuestion());
        $result['text'] = ilRTE::_replaceMediaObjectImageSrc($this->getErrorText(), 0);
        $result['nr_of_tries'] = $this->getNrOfTries();
        $result['shuffle'] = $this->getShuffle();
        $result['feedback'] = [
            'onenotcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), false)),
            'allcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), true))
        ];

        $result['correct_answers'] = $this->getErrorDataAsArrayForJS();
        $result['answers'] = $this->getParsedErrorTextForJS();

        $mobs = ilObjMediaObject::_getMobsOfObject("qpl:html", $this->getId());
        $result['mobs'] = $mobs;

        return json_encode($result);
    }

    public function getOperators($expression): array
    {
        return ilOperatorsExpressionMapping::getOperatorsByExpression($expression);
    }

    public function getExpressionTypes(): array
    {
        return [
            iQuestionCondition::PercentageResultExpression,
            iQuestionCondition::NumberOfResultExpression,
            iQuestionCondition::EmptyAnswerExpression,
            iQuestionCondition::ExclusiveResultExpression
        ];
    }

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

        $data = $this->db->queryF(
            "SELECT value1+1 as value1 FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s AND step = (
                                SELECT MAX(step) FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s
                        )",
            ["integer", "integer", "integer","integer", "integer", "integer"],
            [$active_id, $pass, $this->getId(), $active_id, $pass, $this->getId()]
        );

        while ($row = $this->db->fetchAssoc($data)) {
            $result->addKeyValue($row["value1"], $row["value1"]);
        }

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

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

        return $result;
    }

    public function parseErrorText(): void
    {
        $text_by_paragraphs = preg_split(self::PARAGRAPH_SPLIT_REGEXP, $this->getErrorText());
        $text_array = [];
        $offset = 0;
        foreach ($text_by_paragraphs as $paragraph) {
            $text_array[] = $this->addErrorInformationToTextParagraphArray(
                preg_split(self::WORD_SPLIT_REGEXP, trim($paragraph)),
                $offset
            );
            $offset += count(end($text_array));
        }
        $this->setParsedErrorText($text_array);
    }

    private function addErrorInformationToTextParagraphArray(array $paragraph, int $offset): array
    {
        $paragraph_with_error_info = [];
        $passage_start = null;
        foreach ($paragraph as $position => $word) {
            $actual_position = $position + $offset;
            if ($passage_start !== null
                && (mb_strrpos($word, self::ERROR_PARAGRAPH_DELIMITERS['end'])  === mb_strlen($word) - 2
                || mb_strrpos($word, self::ERROR_PARAGRAPH_DELIMITERS['end'])  === mb_strlen($word) - 3
                    && preg_match(self::FIND_PUNCTUATION_REGEXP, mb_substr($word, -1)) === 1)) {

                $actual_word = $this->parsePassageEndWord($word);

                $paragraph_with_error_info[$passage_start]['text_wrong'] .=
                    ' ' . $actual_word;
                $paragraph_with_error_info[$actual_position] = [
                    'text' => $actual_word,
                    'error_type' => 'passage_end'
                ];
                $passage_start = null;
                continue;
            }
            if ($passage_start !== null) {
                $paragraph_with_error_info[$passage_start]['text_wrong'] .= ' ' . $word;
                $paragraph_with_error_info[$actual_position] = [
                    'text' => $word,
                    'error_type' => 'in_passage'
                ];
                continue;
            }
            if (mb_strpos($word, self::ERROR_PARAGRAPH_DELIMITERS['start']) === 0) {
                $paragraph_with_error_info[$actual_position] = [
                    'text' => substr($word, 2),
                    'text_wrong' => substr($word, 2),
                    'error_type' => 'passage_start',
                    'error_position' => $actual_position,
                ];
                $passage_start = $actual_position;
                continue;
            }
            if (mb_strpos($word, self::ERROR_WORD_MARKER) === 0) {
                $paragraph_with_error_info[$actual_position] = [
                    'text' => substr($word, 1),
                    'text_wrong' => substr($word, 1),
                    'error_type' => 'word',
                    'error_position' => $actual_position,
                ];
                continue;
            }

            $paragraph_with_error_info[$actual_position] = [
                'text' => $word,
                'error_type' => 'none',
                'points' => $this->getPointsWrong()
            ];
        }

        return $paragraph_with_error_info;
    }

    private function parsePassageEndWord(string $word): string
    {
        if (mb_substr($word, -2) === self::ERROR_PARAGRAPH_DELIMITERS['end']) {
            return mb_substr($word, 0, -2);
        }
        return mb_substr($word, 0, -3) . mb_substr($word, -1);
    }

    public function getAvailableAnswerOptions($index = null): ?int
    {
        $error_text_array = array_reduce(
            $this->parsed_errortext,
            fn ($c, $v) => $c + $v
        );

        if ($index === null) {
            return $error_text_array;
        }

        if (array_key_exists($index, $error_text_array)) {
            return $error_text_array[$index];
        }

        return null;
    }

    private function generateArrayByPositionFromErrorData(): array
    {
        $array_by_position = [];
        foreach ($this->errordata as $error) {
            $array_by_position[$error->getPosition()] = [
                'length' => $error->getLength(),
                'points' => $error->getPoints(),
                'text' => $error->getTextWrong(),
                'text_correct' => $error->getTextCorrect()
            ];
        }
        ksort($array_by_position);
        return $array_by_position;
    }

    private function getErrorTokenHtml($item, $class, $useLinkTags): string
    {
        if ($useLinkTags) {
            return '<a class="' . $class . '" href="#">' . ($item == '&nbsp;' ? $item : ilLegacyFormElementsUtil::prepareFormOutput(
                $item
            )) . '</a>';
        }

        return '<span class="' . $class . '">' . ($item == '&nbsp;' ? $item : ilLegacyFormElementsUtil::prepareFormOutput(
            $item
        )) . '</span>';
    }
}