<?php
/* For licensing terms, see /license.txt */

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

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

	/**
     * function which redifines Question::createAnswersForm
     * @param the formvalidator instance
     * @param the answers number to display
     */
    function createAnswersForm($form)
    {
        $editorConfig = array(
            'ToolbarSet' => 'TestProposedAnswer',
            'Width' => '100%',
            'Height' => '125'
        );

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

        $obj_ex = $_SESSION['objExercise'];

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

        $html = '<table class="table table-striped table-hover">
            <thead>
                <tr>
                    <th width="10">' . get_lang('Number') . '</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('Weighting') . '</th>
                </tr>
            </thead>
            <tbody>';

        $form->addHtml($html);

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

        $form->addElement('hidden', 'nb_answers');
        $boxes_names = array();

        if ($nb_answers < 1) {
            $nb_answers = 1;
            Display::display_normal_message(get_lang('YouHaveToCreateAtLeastOneAnswer'));
        }

        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[' . $i . ']'] = float_format($answer->weighting[$i], 1);
                $defaults['correct[' . $i . ']'] = $answer->correct[$i];
            } else {
                $defaults['answer[1]'] = get_lang('DefaultMultipleAnswer2');
                $defaults['comment[1]'] = get_lang('DefaultMultipleComment2');
                $defaults['correct[1]'] = true;
                $defaults['weighting[1]'] = 10;

                $defaults['answer[2]'] = get_lang('DefaultMultipleAnswer1');
                $defaults['comment[2]'] = get_lang('DefaultMultipleComment1');
                $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->addElement('checkbox', 'correct[' . $i . ']', null, null,
                'class="checkbox" style="margin-left: 0em;"');
            $boxes_names[] = 'correct[' . $i . ']';

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

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

            $form->addElement('text', 'weighting[' . $i . ']', null, array('class' => "col-md-1", 'value' => '0'));
            $form->addHtml('</tr>');
        }

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

        $form->add_multiple_required_rule($boxes_names, get_lang('ChooseAtLeastOneCheckbox'), 'multiple_required');

        $buttonGroup = [];

        global $text, $class;
        if ($obj_ex->edit_exercise_in_lp == true) {
            // setting the save button here and not in the question class.php
            $buttonGroup[] = $form->addButtonDelete(get_lang('LessAnswer'), 'lessAnswers', true);
            $buttonGroup[] = $form->addButtonCreate(get_lang('PlusAnswer'), 'moreAnswers', true);
            $buttonGroup[] = $form->addButtonSave($text, 'submitQuestion', true);
        }

        $form->addGroup($buttonGroup);

        $defaults['correct'] = $correct;

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


	/**
	 * abstract function which creates the form to create / edit the answers of the question
	 * @param the formvalidator instance
	 * @param the answers number to display
	 */
	function processAnswersCreation($form) {

		$questionWeighting = $nbrGoodAnswers = 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();
	}

	function return_header($feedback_type = null, $counter = null, $score = null)
    {
	    $header = parent::return_header($feedback_type, $counter, $score);
	    $header .= '<table class="'.$this->question_table_class .'">
			<tr>
				<th>'.get_lang("Choice").'</th>
				<th>'. get_lang("ExpectedChoice").'</th>
				<th>'. get_lang("Answer").'</th>';
        $header .= '<th>'.get_lang("Comment").'</th>';
        $header .= '</tr>';
        return $header;
	}


}
