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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/>.

/**
 * Question related functions.
 *
 * This file was created just because Fragment API expects callbacks to be defined on lib.php.
 *
 * Please, do not add new functions to this file.
 *
 * @package   core_question
 * @copyright 2018 Simey Lameze <simey@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * Question tags fragment callback.
 *
 * @param array $args Arguments to the form.
 * @return null|string The rendered form.
 */
function core_question_output_fragment_tags_form($args) {

    if (!empty($args['id'])) {
        global $CFG, $DB;
        require_once($CFG->dirroot . '/question/type/tags_form.php');
        require_once($CFG->libdir . '/questionlib.php');
        $id = clean_param($args['id'], PARAM_INT);
        $editingcontext = $args['context'];

        // Load the question and some related information.
        $question = $DB->get_record('question', ['id' => $id]);

        if ($coursecontext = $editingcontext->get_course_context(false)) {
            $course = $DB->get_record('course', ['id' => $coursecontext->instanceid]);
            $filtercourses = [$course];
        } else {
            $filtercourses = null;
        }

        $category = $DB->get_record('question_categories', ['id' => $question->category]);
        $questioncontext = \context::instance_by_id($category->contextid);
        $contexts = new \question_edit_contexts($editingcontext);

        // Load the question tags and filter the course tags by the current course.
        if (core_tag_tag::is_enabled('core_question', 'question')) {
            $tagobjectsbyquestion = core_tag_tag::get_items_tags('core_question', 'question', [$question->id]);
            if (!empty($tagobjectsbyquestion[$question->id])) {
                $tagobjects = $tagobjectsbyquestion[$question->id];
                $sortedtagobjects = question_sort_tags($tagobjects,
                        context::instance_by_id($category->contextid), $filtercourses);
            }
        }
        $formoptions = [
            'editingcontext' => $editingcontext,
            'questioncontext' => $questioncontext,
            'contexts' => $contexts->all()
        ];
        $data = [
            'id' => $question->id,
            'questioncategory' => $category->name,
            'questionname' => $question->name,
            'categoryid' => $category->id,
            'contextid' => $category->contextid,
            'context' => $questioncontext->get_context_name(),
            'tags' => $sortedtagobjects->tags ?? [],
            'coursetags' => $sortedtagobjects->coursetags ?? [],
        ];

        $cantag = question_has_capability_on($question, 'tag');
        $mform = new \core_question\form\tags(null, $formoptions, 'post', '', null, $cantag, $data);
        $mform->set_data($data);

        return $mform->render();
    }
}