import { async, inject, TestBed } from '@angular/core/testing';
import { MockBackend, MockConnection } from '@angular/http/testing';
import { HttpModule, Http, XHRBackend, Response, ResponseOptions } from '@angular/http';
import { Router } from '@angular/router';
import { RouterTestingModule } from '@angular/router/testing';
import { ApiService } from './api.service';
import * as buildsData from '../../testing/xhr-data/builds.json';

describe('API Service (mockBackend)', () => {

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [HttpModule, RouterTestingModule],
      providers: [
        ApiService,
        { provide: XHRBackend, useClass: MockBackend }
      ]
    })
      .compileComponents();
  }));

  it('can instantiate service when inject service', inject([ApiService], (service: ApiService) => {
    expect(service instanceof ApiService).toBe(true);
  }));

  it('can instantiate service with "new"', inject([Http, Router], (http: Http, router: Router) => {
    expect(http).not.toBeNull('http should be provided');
    const service = new ApiService(http, router);
    expect(service instanceof ApiService).toBe(true, 'new service should be ok');
  }));

  it('can provide the mockBackend as XHRBackend', inject([XHRBackend], (backend: MockBackend) => {
    expect(backend).not.toBeNull('backend should be provided');
  }));

  describe('when getBuilds', () => {
    let backend: MockBackend;
    let service: ApiService;
    let fakeBuilds: any[];
    let response: Response;

    beforeEach(inject([Http, Router, XHRBackend], (http: Http, router: Router, be: MockBackend) => {
      backend = be;
      service = new ApiService(http, router);
      fakeBuilds = (<any>buildsData).data;
      const options = new ResponseOptions({ status: 200, body: { data: fakeBuilds } });
      response = new Response(options);
    }));

    it('should have expected fake builds (then)', async(inject([], () => {
      backend.connections.subscribe((c: MockConnection) => c.mockRespond(response));

      service.getBuilds(5, 0, 'all').subscribe(builds => {
        expect(builds.length).toBe(fakeBuilds.length, 'should have expected no. of builds');
      });
    })));

  });

});