import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import EventService from '../EventService';

@Injectable({
  providedIn: 'root'
})
export class ApiAuthenticationService {
  private authenticated: boolean;
  private user: any;
  private lastCheck: Date;

  constructor(private http: HttpClient, private events: EventService) {
    this.authenticated = false;
    this.user = null;
    this.lastCheck = new Date();
  }

  isAuthenticated() {
    return this.authenticated;
  }

  isAdmin() {
    return this.isAuthenticated() && this.user.role == 'ADMIN';
  }

  getImpersonatedId() {
    return this.user.impersonation?.id;
  }

  getUsername() {
    return this.user?.name;
  }

  update() {
    const jwt = localStorage.getItem('jwt');
    if (!jwt) {
      this.updateAuthenticated(false, null);
      return;
    }

    // /api/auth/validate
    this.http.get('/api/auth/validate', {
      headers: {
        'Authorization': 'Bearer ' + jwt
      }
    }).subscribe((data: any) => {
      console.log('jwt validation', data);
      this.updateAuthenticated(data?.authenticated, data?.user);
    });
  }

  private updateAuthenticated(authenticated: boolean, user: any) {
    const previous = this.authenticated;
    this.authenticated = authenticated;
    this.user = user;
    this.lastCheck = new Date();

    if (previous != authenticated) {
      if (authenticated) {
        this.events.emit('login', null);
      } else {
        this.events.emit('logoff', null);
      }
    }
  }
}