<?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: poll meeting join status.
 *
 * @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\local\featureaccess;
use mod_meetletacbmarketplace\local\instance;
use mod_meetletacbmarketplace\local\meetingstatus;

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

/**
 * Lightweight status poll for the activity hero badge / join gate.
 */
class get_meeting_status 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);

        $info = meetingstatus::resolve($inst, (int)$USER->id, true);
        $featurejoin = featureaccess::allowed(featureaccess::JOIN, $inst->context, $inst->record);
        $joinable = $featurejoin && !empty($info['joinable']);

        return [
            'status' => (string)$info['status'],
            'statuslabel' => (string)$info['statuslabel'],
            'joinable' => (bool)$joinable,
            'message' => (string)$info['message'],
            'errorcode' => (string)$info['errorcode'],
            'servertime' => time(),
        ];
    }

    public static function execute_returns(): external_single_structure {
        return new external_single_structure([
            'status' => new external_value(PARAM_ALPHANUMEXT, 'Status code'),
            'statuslabel' => new external_value(PARAM_TEXT, 'Localized status label'),
            'joinable' => new external_value(PARAM_BOOL, 'Whether join may be requested'),
            'message' => new external_value(PARAM_TEXT, 'User-facing gate message'),
            'errorcode' => new external_value(PARAM_ALPHANUMEXT, 'Exception string id when not joinable'),
            'servertime' => new external_value(PARAM_INT, 'Server unix time'),
        ]);
    }
}