import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders, HttpErrorResponse, HttpResponse } from '@angular/common/http';
import { Constants } from '../constants';
import { Observable } from 'rxjs';
import { AppAuthNService, User } from './app-auth-n.service';

@Injectable({
  providedIn: 'root'
})
export class TestApiService {

  constructor(private _httpClient: HttpClient, private _authn: AppAuthNService) {
  }

  public callApi(): Promise<any> {
    return this._authn.getUser().then(user => {
      if (user && user.access_token) {
        return this._callApi(user.access_token);
      }
      else if (user) {
        return this._authn.renewToken().then(user => {
          return this._callApi(user.access_token);
        });
      }
      else {
        throw new Error("user is not logged in");
      }
    });
  }

  _callApi(token: string) {
    let headers = new HttpHeaders({
      'Accept': 'application/json',
      'Authorization': 'Bearer ' + token
    });

    return this._httpClient.get(Constants.apiRoot + "test", { headers: headers })
      .toPromise()
      .catch((result : HttpErrorResponse) => {
          if (result.status === 401){
            return this._authn.renewToken().then(user => {
              return this._callApi(user.access_token);
            });
          }
          throw result;
      });
  }
}