import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, CanActivate } from '@angular/router';
import { Router, RouterStateSnapshot, UrlTree } from '@angular/router';

import { Observable } from 'rxjs';
import { AuthService } from './auth.service';

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

  constructor(
    private auth: AuthService,
    private router: Router
    ) {}
  canActivate()
      route: ActivatedRouteSnapshot,
      state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {

  
    if( this.auth.isLoggedIn() ) {
      return true;
    }
    this.router.navigate(['login']);
    return false;
  }
  
}