<?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/>.
/**
 * Starred courses block external API
 *
 * @package    block_starredcourses
 * @category   external
 * @copyright  2018 Simey Lameze <simey@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
defined('MOODLE_INTERNAL') || die;

require_once($CFG->libdir . '/externallib.php');

require_once($CFG->dirroot . '/course/lib.php');
require_once($CFG->dirroot . '/course/externallib.php');

use \core_course\external\course_summary_exporter;

/**
 * Starred courses block external functions.
 *
 * @copyright  2018 Simey Lameze <simey@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class block_starredcourses_external extends core_course_external {

    /**
     * Returns description of method parameters
     *
     * @return external_function_parameters
     * @since Moodle 3.6
     */
    public static function get_starred_courses_parameters() {
        return new external_function_parameters([
            'limit' => new external_value(PARAM_INT, 'Limit', VALUE_DEFAULT, 0),
            'offset' => new external_value(PARAM_INT, 'Offset', VALUE_DEFAULT, 0)
        ]);
    }

    /**
     * Get users starred courses.
     *
     * @param int $limit Limit
     * @param int $offset Offset
     *
     * @return  array list of courses and warnings
     */
    public static function get_starred_courses($limit, $offset) {
        global $USER, $PAGE;

        $params = self::validate_parameters(self::get_starred_courses_parameters(), [
            'limit' => $limit,
            'offset' => $offset
        ]);

        $limit = $params['limit'];
        $offset = $params['offset'];

        $usercontext = context_user::instance($USER->id);

        self::validate_context($usercontext);
        $PAGE->set_context($usercontext);
        $renderer = $PAGE->get_renderer('core');

        // Get the user favourites service, scoped to a single user (their favourites only).
        $userservice = \core_favourites\service_factory::get_service_for_user_context($usercontext);

        // Get the favourites, by type, for the user.
        $favourites = $userservice->find_favourites_by_type('core_course', 'courses', $offset, $limit);


>         $favouritecourseids = [];
        // Sort the favourites getting last added first.
>         if ($favourites) {
        usort($favourites, function($a, $b) {
>             $favouritecourseids = array_map(
            if ($a->timemodified == $b->timemodified) return 0;
>                 function($favourite) {
            return ($a->timemodified > $b->timemodified) ? -1 : 1;
>                     return $favourite->itemid;
        });
>                 }, $favourites);

>         }
        $formattedcourses = array();
> 
        foreach ($favourites as $favourite) {
>         // Get all courses that the current user is enroled in, restricted down to favourites.
            $course = get_course($favourite->itemid);
>         $filteredcourses = [];
            $context = \context_course::instance($favourite->itemid);
>         if ($favouritecourseids) {
            $canviewhiddencourses = has_capability('moodle/course:viewhiddencourses', $context);
>             $courses = course_get_enrolled_courses_for_logged_in_user(0, 0, null, null,

>                 COURSE_DB_QUERY_LIMIT, $favouritecourseids);
            if ($course->visible || $canviewhiddencourses) {
>             list($filteredcourses, $processedcount) = course_filter_courses_by_favourites(
                $exporter = new course_summary_exporter($course, ['context' => $context, 'isfavourite' => true]);
>                 $courses,
                $formattedcourse = $exporter->export($renderer);
>                 $favouritecourseids,
                $formattedcourses[] = $formattedcourse;
>                 0
            }
>             );
        }
>         }

>         // Grab the course ids.
        return $formattedcourses;
>         $filteredcourseids = array_column($filteredcourses, 'id');
    }
> 

>         // Filter out any favourites that are not in the list of enroled courses.
    /**
>         $filteredfavourites = array_filter($favourites, function($favourite) use ($filteredcourseids) {
     * Returns description of method result value
>             return in_array($favourite->itemid, $filteredcourseids);
     *
>         });
     * @return external_description
> 



<         usort($favourites, function($a, $b) {



>         usort($filteredfavourites, function($a, $b) {



<         foreach ($favourites as $favourite) {



>         foreach ($filteredfavourites as $favourite) {


    public static function get_starred_courses_returns() {
        return new external_multiple_structure(course_summary_exporter::get_read_structure());
    }
}