<?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/>.

/**
 * External: reset site role mapping or feature-access matrix to defaults.
 *
 * @package    mod_meetletacbfree
 * @copyright  2026 MeetLet <info@meetlet.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_meetletacbfree\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_meetletacbfree\local\featureaccess;
use mod_meetletacbfree\local\roles;

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

/**
 * Ajax-capable reset of access settings defaults.
 */
class reset_access_settings extends external_api {
    public static function execute_parameters(): external_function_parameters {
        return new external_function_parameters([
            'section' => new external_value(PARAM_ALPHA, 'Section: rolemapping or featureaccess'),
        ]);
    }

    public static function execute(string $section): array {
        $params = self::validate_parameters(self::execute_parameters(), ['section' => $section]);
        $context = \context_system::instance();
        self::validate_context($context);
        require_capability('moodle/site:config', $context);

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

        if ($params['section'] === 'rolemapping') {
            $rules = roles::builtin_site_defaults();
            $json = json_encode($rules, JSON_UNESCAPED_UNICODE);
            set_config('default_participants', $json, 'meetletacbfree');
            return [
                'success' => true,
                'section' => 'rolemapping',
                'matrixjson' => json_encode(roles::matrix_from_rules($rules), JSON_UNESCAPED_UNICODE),
                'message' => get_string('reset_success_rolemapping', 'meetletacbfree'),
            ];
        }

        if ($params['section'] === 'featureaccess') {
            $matrix = featureaccess::builtin_defaults();
            $json = json_encode($matrix, JSON_UNESCAPED_UNICODE);
            set_config('featureaccess', $json, 'meetletacbfree');
            return [
                'success' => true,
                'section' => 'featureaccess',
                'matrixjson' => json_encode($matrix, JSON_UNESCAPED_UNICODE),
                'message' => get_string('reset_success_featureaccess', 'meetletacbfree'),
            ];
        }

        throw new \moodle_exception('invalidparameter');
    }

    public static function execute_returns(): external_single_structure {
        return new external_single_structure([
            'success' => new external_value(PARAM_BOOL, 'Whether reset succeeded'),
            'section' => new external_value(PARAM_ALPHA, 'Section that was reset'),
            'matrixjson' => new external_value(PARAM_RAW, 'JSON-encoded matrix payload'),
            'message' => new external_value(PARAM_TEXT, 'Success message'),
        ]);
    }
}