<?php

/* For licensing terms, see /license.txt */

use ChamiloSession as Session;

/**
 * Class MultipleAnswer.
 *
 * This class allows to instantiate an object of type MULTIPLE_ANSWER (MULTIPLE CHOICE, MULTIPLE ANSWER),
 * extending the class question
 *
 * @author Eric Marguin
 */
class MultipleAnswer extends Question
{
    public $typePicture = 'mcma.png';
    public $explanationLangVar = 'Multiple answer';

    public function __construct()
    {
        parent::__construct();
        $this->type = MULTIPLE_ANSWER;
        $this->isContent = $this->getIsContent();
    }

    public function createAnswersForm($form)
    {
        $editorConfig = [
            'ToolbarSet' => 'TestProposedAnswer',
            'Width' => '100%',
            'Height' => '125',
        ];

        // The previous default value was 2. See task #1759.
        $nb_answers = $_POST['nb_answers'] ?? 4;
        $nb_answers += (isset($_POST['lessAnswers']) ? -1 : (isset($_POST['moreAnswers']) ? 1 : 0));

        $obj_ex = Session::read('objExercise');

        $form->addHeader(get_lang('Answers'));

        $html = '<table class="table table-striped table-hover">
            <thead>
                <tr>
                    <th width="10">'.get_lang('N°').'</th>
                    <th width="10">'.get_lang('True').'</th>
                    <th width="50%">'.get_lang('Answer').'</th>
                    <th width="50%">'.get_lang('Comment').'</th>
                    <th width="10">'.get_lang('Score').'</th>
                </tr>
            </thead>
            <tbody>';

        $form->addHtml($html);

        $defaults = [];
        $correct = 0;
        $answer = false;
        if (!empty($this->id)) {
            $answer = new Answer($this->id);
            $answer->read();
            if ($answer->nbrAnswers > 0 && !$form->isSubmitted()) {
                $nb_answers = $answer->nbrAnswers;
            }
        }

        $form->addHidden('nb_answers', $nb_answers);
        $boxes_names = [];
        if ($nb_answers < 1) {
            $nb_answers = 1;
            echo Display::return_message(get_lang('You have to create at least one answer'));
        }

        for ($i = 1; $i <= $nb_answers; $i++) {
            $form->addHtml('<tr>');
            if (is_object($answer)) {
                $defaults['answer['.$i.']'] = $answer->answer[$i] ?? '';
                $defaults['comment['.$i.']'] = $answer->comment[$i] ?? '';
                $defaults['weighting['.$i.']'] = isset($answer->weighting[$i]) ? float_format($answer->weighting[$i], 1) : 0;
                $defaults['correct['.$i.']'] = $answer->correct[$i] ?? '';
            } else {
                $defaults['answer[1]'] = get_lang('Lack of Vitamin A');
                $defaults['comment[1]'] = get_lang('The Vitamin A is responsible for...');
                $defaults['correct[1]'] = true;
                $defaults['weighting[1]'] = 10;

                $defaults['answer[2]'] = get_lang('Lack of Calcium');
                $defaults['comment[2]'] = get_lang('The calcium acts as a ...');
                $defaults['correct[2]'] = false;
                $defaults['weighting[2]'] = -5;
            }
            $renderer = &$form->defaultRenderer();

            $renderer->setElementTemplate(
                '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                'correct['.$i.']'
            );
            $renderer->setElementTemplate(
                '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                'counter['.$i.']'
            );
            $renderer->setElementTemplate(
                '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                'answer['.$i.']'
            );
            $renderer->setElementTemplate(
                '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                'comment['.$i.']'
            );
            $renderer->setElementTemplate(
                '<td><!-- BEGIN error --><span class="form_error">{error}</span><!-- END error --><br/>{element}</td>',
                'weighting['.$i.']'
            );

            $answer_number = $form->addElement('text', 'counter['.$i.']', null, 'value="'.$i.'"');
            $answer_number->freeze();

            $form->addCheckBox('correct['.$i.']', null);
            $boxes_names[] = 'correct['.$i.']';

            $form->addHtmlEditor("answer[$i]", null, null, false, $editorConfig);
            $form->addRule('answer['.$i.']', get_lang('Required field'), 'required');

            $form->addHtmlEditor("comment[$i]", null, null, false, $editorConfig);

            $form->addText('weighting['.$i.']', null, true, ['style' => 'width: 60px;', 'value' => '0']);
            $form->addHtml('</tr>');
        }

        $form->addHtml('</tbody>');
        $form->addHtml('</table>');

        $form->add_multiple_required_rule(
            $boxes_names,
            get_lang('Choose at least one good answer'),
            'multiple_required'
        );

        $buttonGroup = [];
        global $text;
        if (true == $obj_ex->edit_exercise_in_lp ||
            (empty($this->exerciseList) && empty($obj_ex->id))
        ) {
            // setting the save button here and not in the question class.php
            $buttonGroup[] = $form->addButtonDelete(get_lang('Remove answer option'), 'lessAnswers', true);
            $buttonGroup[] = $form->addButtonCreate(get_lang('Add answer option'), 'moreAnswers', true);
            $buttonGroup[] = $form->addButton(
                'submitQuestion',
                $text,
                'check',
                'primary',
                'default',
                null,
                ['id' => 'submit-question'],
                true
            );
        }

        $form->addGroup($buttonGroup);

        $defaults['correct'] = $correct;

        if (!empty($this->id)) {
            $form->setDefaults($defaults);
        } else {
            if (1 == $this->isContent) {
                $form->setDefaults($defaults);
            }
        }
        $form->setConstants(['nb_answers' => $nb_answers]);
    }

    public function processAnswersCreation($form, $exercise)
    {
        $questionWeighting = 0;
        $objAnswer = new Answer($this->id);
        $nb_answers = $form->getSubmitValue('nb_answers');

        for ($i = 1; $i <= $nb_answers; $i++) {
            $answer = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('answer['.$i.']')));
            $comment = trim(str_replace(['<p>', '</p>'], '', $form->getSubmitValue('comment['.$i.']')));
            $weighting = trim($form->getSubmitValue('weighting['.$i.']'));
            $goodAnswer = trim($form->getSubmitValue('correct['.$i.']'));

            if ($goodAnswer) {
                $weighting = abs($weighting);
            } else {
                $weighting = abs($weighting);
                $weighting = -$weighting;
            }
            if ($weighting > 0) {
                $questionWeighting += $weighting;
            }
            $objAnswer->createAnswer(
                $answer,
                $goodAnswer,
                $comment,
                $weighting,
                $i
            );
        }

        // saves the answers into the data base
        $objAnswer->save();

        // sets the total weighting of the question
        $this->updateWeighting($questionWeighting);
        $this->save($exercise);
    }

    public function return_header(Exercise $exercise, $counter = null, $score = [])
    {
        $header = parent::return_header($exercise, $counter, $score);
        $header .= '<table class="'.$this->questionTableClass.'"><tr>';

        $header .= '<th>'.get_lang('Your choice').'</th>';

        if ($exercise->showExpectedChoiceColumn()) {
            $header .= '<th>'.get_lang('Expected choice').'</th>';
        }

        $header .= '<th>'.get_lang('Answer').'</th>';
        if ($exercise->showExpectedChoice()) {
            $header .= '<th class="text-center">'.get_lang('Status').'</th>';
        }

        if (false === $exercise->hideComment) {
            $header .= '<th>'.get_lang('Comment').'</th>';
        }
        $header .= '</tr>';

        return $header;
    }
}
