import {Injectable} from '@angular/core';
import {ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree} from '@angular/router';
import {Observable} from 'rxjs';
import {NotificationService} from "../service/notification.service";
import {NotificationType} from "../notification/notification-type";
import {AuthenticationService} from "../service/authentication.service";
// import { AuthenticationService } from '../service/authentication.service';

@Injectable({
  providedIn: 'root'
})
export class AuthenticationGuard implements CanActivate {

  constructor(
    private authenticationService: AuthenticationService,
    private router: Router,
    private notificationService: NotificationService
  ) {
  }

  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    return this.isUserLoggedIn();
  }

  private isUserLoggedIn(): boolean {
    if (this.authenticationService.isUserLoggedIn())
      return true;
    else {
      this.router.navigate(['/login']);

      this.notificationService.notify(NotificationType.ERROR, `You need to log in to access this page`);

      return false;
    }
  }
}