client/src/app/menu.component.ts


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import { Component, EventEmitter, OnInit, Output } from '@angular/core';
import { Router, ROUTER_DIRECTIVES } from '@angular/router';

import { AuthService, AuthStatus } from './shared';

@Component({
  selector: 'my-menu',
  template: require('./menu.component.html'),
  directives: [ ROUTER_DIRECTIVES ]
})
export class MenuComponent implements OnInit {
  @Output() enteredInAdmin = new EventEmitter<boolean>();
  isLoggedIn: boolean;

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

  ngOnInit() {
    this.isLoggedIn = this.authService.isLoggedIn();

    this.authService.loginChangedSource.subscribe(
      status => {
        if (status === AuthStatus.LoggedIn) {
          this.isLoggedIn = true;
          console.log('Logged in.');
        } else if (status === AuthStatus.LoggedOut) {
          this.isLoggedIn = false;
          console.log('Logged out.');
        } else {
          console.error('Unknown auth status: ' + status);
        }
      }
    );
  }

  enterInAdmin() {
    this.enteredInAdmin.emit(true);
  }

  isUserAdmin() {
    return this.authService.isAdmin();
  }

  logout() {
    this.authService.logout();
    // Redirect to home page
    this.router.navigate(['/videos/list']);
  }
}