import { LocaleService } from './common/i18n';
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { Location } from '@angular/common';
import { Http, RequestOptions, Response, Headers } from '@angular/http';
import { Observable } from 'rxjs/Observable';

import { LocalStorageService } from 'angular-2-local-storage';

const SECURIS_TOKEN = "X-SECURIS-TOKEN";

@Injectable()
export class UserService {

  count : number = 0;

  constructor(private $L: LocaleService,
              private router: Router,
              private store: LocalStorageService, 
              private http: Http) {
    
  }

  public login(username: string, password: string) : Observable<string> {
    let params = new URLSearchParams();
    params.append('username', username);
    params.append('password', password);
    let options = new RequestOptions({ headers: new Headers({ "Content-Type": "application/x-www-form-urlencoded" })});
    return this.http.post('user/login', params.toString(), options)
                    .map((resp) => this.mapLogin(resp))
                    .catch((err) => this.handleError(err));
  }

  private mapLogin(res : Response) : string {
    let data = res.json();
    this.store.set('user_full_name', data.full_name);
    this.store.set('username', data.username);
		this.store.set('token', data.token);
    return <string>data.token;
  }    

  isLoggedIn() : Observable<Boolean> {
    if (!this.existsToken()) {
      return Observable.of(false);
    }
    var token = this.store.get("token");
    let option = new RequestOptions({ headers: new Headers({ 'X-SECURIS-TOKEN': token }) });
    return this.http.get('check', option)
                    .map((resp) => this.mapCheck(resp))
                    .catch((err) => this.handleError(err));
  }

  private mapCheck(res : Response) : boolean {
    let data = res.json();
    if (data.valid) {
      this.store.set('user', data.user);
    }
    return data.valid;
  }  

  existsToken() : Boolean {
    return this.store.get("token") !== null;
  }

  logout() : void {
    this.store.remove('user', 'token');
    this.router.navigate(['public/login']);
  }


  private handleError (error: Response | any) {
    // In a real world app, we might use a remote logging infrastructure
    let errMsg: string;
    if (error instanceof Response) {
      const err = JSON.stringify(error);
      errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
    } else {
      errMsg = error.message ? error.message : error.toString();
    }

    if (error.status === 403 /* forbidden */ || error.status === 401 /* unauthorized */) {
      errMsg = this.$L.get('Invalid credentials');
    } else if (error.status === 418 /* Teapot */) {
      errMsg = this.$L.get(error.headers.get('X-SECURIS-ERROR-MSG'));
    } else {
      console.error(error);
      errMsg = this.$L.get(`Unexpected error HTTP (${error.status}) accessing to server. Contact with the administrator.`);
    }

    console.error(errMsg);
    return Observable.throw(errMsg);
  }

}