<?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/>.

/**
 * Create any needed groups in Microsoft 365.
 *
 * @package local_o365
 * @author James McQuillan <james.mcquillan@remote-learner.net>
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @copyright (C) 2014 onwards Microsoft, Inc. (http://microsoft.com/)
 */

namespace local_o365\task;

use core\task\scheduled_task;
use Exception;
use local_o365\feature\coursesync\main;
use local_o365\utils;
use moodle_exception;

/**
 * Create any needed groups in Microsoft 365.
 */
class coursesync extends scheduled_task {
    /**
     * Get a descriptive name for this task (shown to admins).
     *
     * @return string
     */
    public function get_name() {
        return get_string('task_coursesync', 'local_o365');
    }

    /**
     * Do the job.
     *
     * @return bool|void
     */
    public function execute() {
        global $SESSION;

        $SESSION->o365_groups_not_exist = [];
        $SESSION->o365_newly_created_groups = [];
        $SESSION->o365_users_not_exist = [];

        // Raise memory and time limits to handle large numbers of teams/groups.
        raise_memory_limit(MEMORY_HUGE);
        @set_time_limit(0);

        if (utils::is_connected() !== true) {
            return false;
        }

        if (\local_o365\feature\coursesync\utils::is_enabled() !== true) {
            mtrace('Course synchronisation not enabled, skipping...');
            return true;
        }

        try {
            $graphclient = utils::get_api();
        } catch (moodle_exception $e) {
            utils::debug('Exception: ' . $e->getMessage(), __METHOD__, $e);
            return false;
        }

        $coursesync = new main($graphclient, true);
        $coursesync->sync_courses();

        // Update the unified groups and teams cache.
        // Returns true = cache updated, null = skipped (rate limit), false = error.
        // Cleanup is only safe to run when the cache was actually refreshed (true).
        try {
            if (utils::update_groups_cache($graphclient, 1) === true) {
                // Cleanup orphaned team connections and save not found groups.
                $coursesync->cleanup_teams_connections();
                $coursesync->save_not_found_groups();
                utils::clean_up_not_found_groups();
            }
        } catch (Exception $e) {
            mtrace('Error updating groups/teams cache: ' . $e->getMessage());
            utils::debug('Exception in update_groups_cache: ' . $e->getMessage(), __METHOD__, $e);
        }

        $coursesync->cleanup_course_connection_records();
    }
}
