import { Injectable } from '@angular/core';
import {
  Router,
  CanActivate,
  ActivatedRouteSnapshot,
  RouterStateSnapshot
} from '@angular/router';
import { AuthService } from './auth.service';
import { Observable } from 'rxjs';

@Injectable()
export class AuthGuard implements CanActivate {

  constructor(
    private auth: AuthService,
    private router: Router
  ) { }

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): Observable<boolean> | Promise<boolean> | boolean {
    if (this.auth.isAuthenticated) {
      return true;
    }
    this.router.navigate([this.auth.onAuthFailureUrl]);
    return false;
  }

}