import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Storage } from '@ionic/storage';
import 'rxjs/add/operator/map'

const httpOptions = {
    headers: new HttpHeaders({
      'Content-Type'    : 'application/json',
      'Authorization'   : 'Basic ' + btoa('user'+':'+'pass')
    })
  };

@Injectable()
export class AuthenticationService {
    public token: string;

    constructor(private http: HttpClient, private _storage: Storage) {
        _storage.get('currentUser')
            .then(res => {
                let currentUser = res;
                this.token = currentUser && currentUser.token;
            })
    }

    login(municipio, username: string, password: string): Observable<boolean> {
        return this.http.post('http://localhost:8080/datasnap/rest/TService/Login/',
            {  ibge: municipio.ibge, username: username, password: password },
            httpOptions)
            .map(res => {
                let token = res && res['token'];
                if (token) {
                    this.token = token;
                    this._storage.set('currentUser', { username: username, municipio: municipio, token: token });
                    return true;
                } else {
                    return false;
                }
            });
    }

    logout(): void {
        this.token = null;
        this._storage.remove('currentUser');
    }
}