<?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/>.

/**
 * Ajax: build SSO join URL.
 *
 * @package    mod_meetletacbmarketplace
 * @copyright  2026 MeetLet
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_meetletacbmarketplace\external;

use core_external\external_api;
use core_external\external_function_parameters;
use core_external\external_single_structure;
use core_external\external_value;
use mod_meetletacbmarketplace\api\service;
use mod_meetletacbmarketplace\local\config;
use mod_meetletacbmarketplace\local\instance;
use mod_meetletacbmarketplace\local\roles;
use mod_meetletacbmarketplace\local\sso;
use mod_meetletacbmarketplace\local\usererror;
use moodle_exception;

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

/**
 * Prepare Adobe Connect join URL for current user.
 */
class get_join_url extends external_api {
    public static function execute_parameters(): external_function_parameters {
        return new external_function_parameters([
            'cmid' => new external_value(PARAM_INT, 'Course module id'),
            'groupid' => new external_value(PARAM_INT, 'Group id', VALUE_DEFAULT, 0),
        ]);
    }

    public static function execute(int $cmid, int $groupid = 0): array {
        global $USER;

        $params = self::validate_parameters(self::execute_parameters(), [
            'cmid' => $cmid,
            'groupid' => $groupid,
        ]);

        \mod_meetletacbmarketplace\registration\manager::require_registered();

        $inst = instance::get_from_cmid($params['cmid'], $params['groupid']);
        self::validate_context($inst->context);
        require_capability('mod/meetletacbmarketplace:view', $inst->context);
        if (!\mod_meetletacbmarketplace\local\featureaccess::allowed(
            \mod_meetletacbmarketplace\local\featureaccess::JOIN,
            $inst->context,
            $inst->record
        )) {
            throw new moodle_exception('notparticipant', 'meetletacbmarketplace');
        }

        if ($inst->cm->groupmode != NOGROUPS) {
            $usrgroups = groups_get_user_groups($inst->course->id, $USER->id);
            $usrgroups = $usrgroups[0] ?? [];
            $aag = has_capability('moodle/site:accessallgroups', $inst->context);
            if (!$aag && $params['groupid'] && !in_array($params['groupid'], $usrgroups, false)) {
                throw new moodle_exception('usergrouprequired', 'meetletacbmarketplace');
            }
        }

        $adoberole = roles::resolve_adobe_role($inst->record, $inst->context, $USER->id);
        if ($adoberole === null) {
            throw new moodle_exception('notparticipant', 'meetletacbmarketplace');
        }

        try {
            // Gate join before any Adobe user provisioning / SSO.
            $lifecycle = \mod_meetletacbmarketplace\local\meetingstatus::resolve($inst, (int)$USER->id, true);
            if (empty($lifecycle['joinable'])) {
                $code = !empty($lifecycle['errorcode']) ? $lifecycle['errorcode'] : 'meetingended';
                throw new moodle_exception($code, 'meetletacbmarketplace');
            }

            $scoid = $inst->require_meeting();
            $service = new service();
            $service->login_admin();
            $info = $service->meeting_info($scoid);
            $service->logout();
            if (!$info) {
                throw new moodle_exception('nomeeting', 'meetletacbmarketplace');
            }

            $auth = sso::provision_and_login($USER, $scoid, $adoberole);
            $url = config::with_html_client(config::public_url($info->url, $auth['cookie']));

            $event = \mod_meetletacbmarketplace\event\meeting_joined::create([
                'context' => $inst->context,
                'objectid' => $inst->record->id,
                'relateduserid' => $USER->id,
            ]);
            $event->trigger();

            return usererror::ws_ok($url);
        } catch (\Throwable $e) {
            if ($e instanceof moodle_exception && in_array($e->errorcode, ['nopermissions', 'requirelogin', 'invalidparameter'], true)) {
                throw $e;
            }
            return usererror::ws_fail($e, $inst->context);
        }
    }

    public static function execute_returns(): external_single_structure {
        return new external_single_structure(usererror::ws_url_returns());
    }
}