// Copyright 2017 The Kubernetes Authors.
//
// 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, Router, UrlTree} from '@angular/router';
import {LoginStatus} from '@api/backendapi';
import {Observable, of} from 'rxjs';
import {catchError, first, switchMap} from 'rxjs/operators';
import {AuthService} from '../global/authentication';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(private readonly authService_: AuthService, private readonly router_: Router) {}

  canActivate(): Observable<boolean | UrlTree> {
    return this.authService_
      .getLoginStatus()
      .pipe(first())
      .pipe(
        switchMap((loginStatus: LoginStatus) => {
          if (
            this.authService_.isAuthenticationEnabled(loginStatus) &&
            !this.authService_.isAuthenticated(loginStatus)
          ) {
            return this.router_.navigate(['login']);
          }

          return of(true);
        })
      )
      .pipe(catchError(_ => this.router_.navigate(['login'])));
  }
}