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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/>.

/**
 * A condition for adding filtering by tag to the question bank.
 *
 * @package   core_question
 * @copyright 2018 Ryan Wyllie <ryan@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core_question\bank\search;
defined('MOODLE_INTERNAL') || die();

/**
 * Question bank search class to allow searching/filtering by tags on a question.
 *
 * @copyright 2018 Ryan Wyllie <ryan@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class tag_condition extends condition {
    /** @var string SQL fragment to add to the where clause. */
    protected $where;
    /** @var string SQL fragment to add to the where clause. */
    protected $contexts;
    /** @var array List of IDs for tags that have been selected in the form. */
    protected $selectedtagids;

/**
     * Constructor.
     * @param context[] $contexts List of contexts to show tags from
     * @param int[] $selectedtagids List of IDs for tags to filter by.
     */
    public function __construct(array $contexts, array $selectedtagids = []) {
        global $DB;

$this->contexts = $contexts;

// If some tags have been selected then we need to filter
        // the question list by the selected tags.
        if ($selectedtagids) {
            // We treat each additional tag as an AND condition rather than
            // an OR condition.
            //
            // For example, if the user filters by the tags "foo" and "bar" then
            // we reduce the question list to questions that are tagged with both
            // "foo" AND "bar". Any question that does not have ALL of the specified
            // tags will be omitted.
            list($tagsql, $tagparams) = $DB->get_in_or_equal($selectedtagids, SQL_PARAMS_NAMED);
            $tagparams['tagcount'] = count($selectedtagids);
            $tagparams['questionitemtype'] = 'question';
            $tagparams['questioncomponent'] = 'core_question';
            $this->selectedtagids = $selectedtagids;
            $this->params = $tagparams;
            $this->where = "q.id IN (SELECT ti.itemid
                                       FROM {tag_instance} ti
                                      WHERE ti.itemtype = :questionitemtype
                                            AND ti.component = :questioncomponent
                                            AND ti.tagid {$tagsql}
                                   GROUP BY ti.itemid
                                     HAVING COUNT(itemid) = :tagcount)";

} else {
            $this->selectedtagids = [];
            $this->params = [];
            $this->where = '';
        }
    }

/**
     * Get the SQL WHERE snippet to be used in the SQL to retrieve the
     * list of questions. This SQL snippet will add the logic for the
     * tag condition.
     *
     * @return string
     */
    public function where() {
        return $this->where;
    }

/**
     * Named SQL params to be used with the SQL WHERE snippet.
     *
     * @return array
     */
    public function params() {
        return $this->params;
    }

/**
     * Print HTML to display the list of tags to filter by.
     */
    public function display_options() {
        global $OUTPUT;

$tags = \core_tag_tag::get_tags_by_area_in_contexts('core_question', 'question', $this->contexts);
        $tagoptions = array_map(function($tag) {
            return [
                'id' => $tag->id,
                'name' => $tag->name,
                'selected' => in_array($tag->id, $this->selectedtagids)
            ];
        }, array_values($tags));
        $context = [
            'tagoptions' => $tagoptions
        ];

echo $OUTPUT->render_from_template('core_question/tag_condition', $context);
    }
}