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

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

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {
  constructor(private router: Router, private authService: AuthService) {

  }

  canActivate(next: ActivatedRouteSnapshot,state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    const head = this.authService.headValue;
    if(head) {
      return true;
    }
    this.router.navigate(['/login']);
    return false;
  }
  
}