import { Injectable } from '@angular/core';
import { Headers, Http, RequestOptions, URLSearchParams } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import * as cookie from 'cookie';

@Injectable()
export class TokenService {

  constructor(private http: Http) { }

  public getPowerBiToken(url, wcId, wid, rid) {
    let params = new URLSearchParams();
    params.set('wcId', wcId);
    params.set('wid', wid);
    params.set('rid', rid);

    return this.http
      .get(`${url}/token`, this.requestOptions(params))
      .map(res => res.json())
      .catch(err => this.handleErr(err));
  }

  requestOptions(query?: URLSearchParams) {
    let requestOptions = new RequestOptions({
      headers: new Headers({ Authorization: `Bearer ${this.token}`, 'Content-Type': 'application/json' })
    });

    if (query) {
      requestOptions.search = query;
    }

    return requestOptions;
  }

  handleErr(err) {
    return Observable.throw(err);
  }

  get token(): string {
    return cookie.parse(document.cookie)['authtoken'];
  }

  set token(token: string) {
    document.cookie = cookie.serialize('authtoken', token || '', { path: '/' });
  }
}