import { Injectable } from '@angular/core';
import { CanActivate, Router, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs/Rx';
import { MockAuthenticationService } from './authentication/authentication.service';
@Injectable()
export class AsynchronousGuard implements CanActivate {
  constructor(private router: Router, private auth: MockAuthenticationService) {}
  canActivate(route:ActivatedRouteSnapshot,
    state:RouterStateSnapshot):Observable<boolean>|boolean {
    this.auth.subscribe((authenticated) => {
    if (authenticated) {
      return true;
    }
    this.router.navigateByUrl('/login');
    return false;
  });
}