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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/>.

/**
 * Privacy class for requesting user data.
 *
 * @package    gradingform_guide
 * @copyright  2018 Sara Arjona <sara@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace gradingform_guide\privacy;

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

use \core_privacy\local\metadata\collection;
use \core_privacy\local\request\transform;
use \core_privacy\local\request\writer;

/**
 * Privacy class for requesting user data.
 *
 * @copyright  2018 Sara Arjona <sara@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class provider implements
        \core_privacy\local\metadata\provider,
        \core_grading\privacy\gradingform_provider_v2,
        \core_privacy\local\request\user_preference_provider {

/**
     * Return the fields which contain personal data.
     *
     * @param   collection $collection The initialised collection to add items to.
     * @return  collection A listing of user data stored through this system.
     */
    public static function get_metadata(collection $collection) : collection {
        $collection->add_database_table('gradingform_guide_fillings', [
            'instanceid' => 'privacy:metadata:instanceid',
            'criterionid' => 'privacy:metadata:criterionid',
            'remark' => 'privacy:metadata:remark',
            'score' => 'privacy:metadata:score'
        ], 'privacy:metadata:fillingssummary');
        $collection->add_user_preference(
            'gradingform_guide-showmarkerdesc',
            'privacy:metadata:preference:showmarkerdesc'
        );
        $collection->add_user_preference(
            'gradingform_guide-showstudentdesc',
            'privacy:metadata:preference:showstudentdesc'
        );

return $collection;
    }

/**
     * Export user data relating to an instance ID.
     *
     * @param  \context $context Context to use with the export writer.
     * @param  int $instanceid The instance ID to export data for.
     * @param  array $subcontext The directory to export this data to.
     */
    public static function export_gradingform_instance_data(\context $context, int $instanceid, array $subcontext) {
        global $DB;
        // Get records from the provided params.
        $params = ['instanceid' => $instanceid];
        $sql = "SELECT gc.shortname, gc.description, gc.maxscore, gf.score, gf.remark
                  FROM {gradingform_guide_fillings} gf
                  JOIN {gradingform_guide_criteria} gc ON gc.id = gf.criterionid
                 WHERE gf.instanceid = :instanceid";
        $records = $DB->get_records_sql($sql, $params);
        if ($records) {
            $subcontext = array_merge($subcontext, [get_string('guide', 'gradingform_guide'), $instanceid]);
            writer::with_context($context)->export_data($subcontext, (object) $records);
        }
    }

/**
     * Deletes all user data related to the provided instance IDs.
     *
     * @param  array  $instanceids The instance IDs to delete information from.
     */
    public static function delete_gradingform_for_instances(array $instanceids) {
        global $DB;
        $DB->delete_records_list('gradingform_guide_fillings', 'instanceid', $instanceids);
    }

/**
     * Store all user preferences for the plugin.
     *
     * @param int $userid The userid of the user whose data is to be exported.
     */
    public static function export_user_preferences(int $userid) {
        $prefvalue = get_user_preferences('gradingform_guide-showmarkerdesc', null, $userid);
        if ($prefvalue !== null) {
            $transformedvalue = transform::yesno($prefvalue);
            writer::export_user_preference(
                'gradingform_guide',
                'gradingform_guide-showmarkerdesc',
                $transformedvalue,
                get_string('privacy:metadata:preference:showmarkerdesc', 'gradingform_guide')
            );
        }

$prefvalue = get_user_preferences('gradingform_guide-showstudentdesc', null, $userid);
        if ($prefvalue !== null) {
            $transformedvalue = transform::yesno($prefvalue);
            writer::export_user_preference(
                'gradingform_guide',
                'gradingform_guide-showstudentdesc',
                $transformedvalue,
                get_string('privacy:metadata:preference:showstudentdesc', 'gradingform_guide')
            );
        }
    }
}