// (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 { CanActivate, CanLoad, UrlTree } from '@angular/router';

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

import { CoreLoginHelper } from '../services/login-helper';

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

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

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

    /**
     * Check if the user has any sites stored.
     *
     * @returns Promise resolved with true if it's not redirected or the redirection route.
     */
    private async guard(): Promise<true | UrlTree> {
        const sites = await CoreUtils.ignoreErrors(CoreSites.getSites(), []);

        if (sites.length > 0) {
            return true;
        }

        const [path, params] = await CoreLoginHelper.getAddSiteRouteInfo();
        const route = Router.parseUrl(path);

        route.queryParams = params;

        return route;
    }

}