import { TestBed } from '@angular/core/testing';

import { LoginService } from './login.service';
import {LocalStorageService} from 'angular-2-local-storage';
import {ApiService} from './api.service';
import {Observable} from 'rxjs';

let loginService: LoginService;
let apiServiceSpy: jasmine.SpyObj<ApiService>;
let localStorageServiceSpy: jasmine.SpyObj<LocalStorageService>;

describe('LoginService', () => {
  beforeEach(() => {
    const apiSpy = jasmine.createSpyObj('ApiService', ['get']);
    const localStorageSpy = jasmine.createSpyObj('LocalStorageService', ['set', 'remove']);

    TestBed.configureTestingModule({
      providers: [
        LoginService,
        {provide: ApiService, useValue: apiSpy},
        {provide: LocalStorageService, useValue: localStorageSpy}
      ]
    });
    loginService = TestBed.inject(LoginService);
    apiServiceSpy = TestBed.inject(ApiService) as jasmine.SpyObj<ApiService>;
    localStorageServiceSpy = TestBed.inject(LocalStorageService) as jasmine.SpyObj<LocalStorageService>;
  });

  it('should be created', () => {
    expect(loginService).toBeTruthy();
  });

  describe('login', () => {
    it('should store the basic auth', () => {
      localStorageServiceSpy.set.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable());
      loginService.login('username', 'password');
      expect(localStorageServiceSpy.set).toHaveBeenCalledWith('basicAuth', 'dXNlcm5hbWU6cGFzc3dvcmQ=');
    });

    it('should remove the basic auth if login fails', () => {
      localStorageServiceSpy.set.and.returnValue(true);
      localStorageServiceSpy.remove.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable(o => o.error()));
      loginService.login('username', 'password');
      expect(localStorageServiceSpy.remove.calls.count()).toBe(1);
      expect(localStorageServiceSpy.remove).toHaveBeenCalledWith('basicAuth');
    });

    it('should resolve true when login succeeds', async () => {
      localStorageServiceSpy.set.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable(o => o.next({status: 'Authorization successful', method: 'basic'})));
      expect(await loginService.login('username', 'password')).toBeTruthy();
    });

    it('should resolve false when a wrong result comes in', async () => {
      localStorageServiceSpy.set.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable(o => o.next({status: 'xxx', method: 'basic'})));
      expect(await loginService.login('username', 'password')).toBeFalsy();
    });

    it('should resolve false on an error', async () => {
      localStorageServiceSpy.set.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable(o => o.error()));
      expect(await loginService.login('username', 'password')).toBeFalsy();
    });
  });

  describe('canActivate', () => {
    it('should return false at first', () => {
      expect(loginService.canActivate(null, null)).toBeFalsy();
    });

    it('returns true if login was successful', async () => {
      localStorageServiceSpy.set.and.returnValue(true);
      apiServiceSpy.get.and.returnValue(new Observable(o => o.next({status: 'Authorization successful', method: 'basic'})));
      await loginService.login('username', 'password');
      expect(loginService.canActivate(null, null)).toBeTruthy();
    });
  });
});