// (C) Copyright 2015 Moodle Pty Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import { Injectable } from '@angular/core';
import { CanLoad, CanActivate, UrlTree } from '@angular/router';
import { CoreLoginHelper } from '@features/login/services/login-helper';

import { CoreSites } from '@services/sites';
import { Router } from '@singletons';

@Injectable({ providedIn: 'root' })
export class CoreMainMenuAuthGuard implements CanLoad, CanActivate {

    /**
     * @inheritdoc
     */
    canActivate(): Promise<true | UrlTree> {
        return this.guard();
    }

    /**
     * @inheritdoc
     */
    canLoad(): Promise<true | UrlTree> {
        return this.guard();
    }

    /**
     * Check if the current user should be redirected to the authentication page.
     */
    private async guard(): Promise<true | UrlTree> {
        if (!CoreSites.instance.isLoggedIn()) {
            return Router.instance.parseUrl('/login');
        }

        if (CoreLoginHelper.instance.isSiteLoggedOut()) {
            await CoreSites.instance.logout();

            return Router.instance.parseUrl('/login');
        }

        return true;
    }

}