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

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

  constructor(private router: Router) {}

  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    const currentUser = JSON.parse(localStorage.getItem(atob('CICADA_USER')));
    if (currentUser) {
      if (route.data.roles && route.data.roles.indexOf(currentUser.role) === -1) {
        this.router.navigate(['/']);
        return false;
      }
      return true;
    }

    this.router.navigate(['/auth'], { queryParams: { returnUrl: state.url }});
    return false;
  }

}