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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * True-false question renderer class.
 *
 * @package    qtype
 * @subpackage truefalse
 * @copyright  2009 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * Generates the output for true-false questions.
 *
 * @copyright  2009 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_truefalse_renderer extends qtype_renderer {
    public function formulation_and_controls(question_attempt $qa,
            question_display_options $options) {

$question = $qa->get_question();
        $response = $qa->get_last_qt_var('answer', '');

$inputname = $qa->get_qt_field_name('answer');
        $trueattributes = array(
            'type' => 'radio',
            'name' => $inputname,
            'value' => 1,
            'id' => $inputname . 'true',
        );
        $falseattributes = array(
            'type' => 'radio',
            'name' => $inputname,
            'value' => 0,
            'id' => $inputname . 'false',
        );

if ($options->readonly) {
            $trueattributes['disabled'] = 'disabled';
            $falseattributes['disabled'] = 'disabled';
        }

// Work out which radio button to select (if any).
        $truechecked = false;
        $falsechecked = false;
        $responsearray = array();
        if ($response) {
            $trueattributes['checked'] = 'checked';
            $truechecked = true;
            $responsearray = array('answer' => 1);
        } else if ($response !== '') {
            $falseattributes['checked'] = 'checked';
            $falsechecked = true;
            $responsearray = array('answer' => 1);
        }

// Work out visual feedback for answer correctness.
        $trueclass = '';
        $falseclass = '';
        $truefeedbackimg = '';
        $falsefeedbackimg = '';
        if ($options->correctness) {
            if ($truechecked) {
                $trueclass = ' ' . $this->feedback_class((int) $question->rightanswer);
                $truefeedbackimg = $this->feedback_image((int) $question->rightanswer);
            } else if ($falsechecked) {
                $falseclass = ' ' . $this->feedback_class((int) (!$question->rightanswer));
                $falsefeedbackimg = $this->feedback_image((int) (!$question->rightanswer));
            }
        }

$radiotrue = html_writer::empty_tag('input', $trueattributes) .
                html_writer::tag('label', get_string('true', 'qtype_truefalse'),
                array('for' => $trueattributes['id'], 'class' => 'ml-1'));
        $radiofalse = html_writer::empty_tag('input', $falseattributes) .
                html_writer::tag('label', get_string('false', 'qtype_truefalse'),
                array('for' => $falseattributes['id'], 'class' => 'ml-1'));

$result = '';
        $result .= html_writer::tag('div', $question->format_questiontext($qa),
                array('class' => 'qtext'));

$result .= html_writer::start_tag('div', array('class' => 'ablock'));
        $result .= html_writer::tag('div', get_string('selectone', 'qtype_truefalse'),
                array('class' => 'prompt'));

$result .= html_writer::start_tag('div', array('class' => 'answer'));
        $result .= html_writer::tag('div', $radiotrue . ' ' . $truefeedbackimg,
                array('class' => 'r0' . $trueclass));
        $result .= html_writer::tag('div', $radiofalse . ' ' . $falsefeedbackimg,
                array('class' => 'r1' . $falseclass));
        $result .= html_writer::end_tag('div'); // Answer.

$result .= html_writer::end_tag('div'); // Ablock.

if ($qa->get_state() == question_state::$invalid) {
            $result .= html_writer::nonempty_tag('div',
                    $question->get_validation_error($responsearray),
                    array('class' => 'validationerror'));
        }

return $result;
    }

public function specific_feedback(question_attempt $qa) {
        $question = $qa->get_question();
        $response = $qa->get_last_qt_var('answer', '');

if ($response) {
            return $question->format_text($question->truefeedback, $question->truefeedbackformat,
                    $qa, 'question', 'answerfeedback', $question->trueanswerid);
        } else if ($response !== '') {
            return $question->format_text($question->falsefeedback, $question->falsefeedbackformat,
                    $qa, 'question', 'answerfeedback', $question->falseanswerid);
        }
    }

public function correct_response(question_attempt $qa) {
        $question = $qa->get_question();

if ($question->rightanswer) {
            return get_string('correctanswertrue', 'qtype_truefalse');
        } else {
            return get_string('correctanswerfalse', 'qtype_truefalse');
        }
    }
}