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

import {ActiveRequests} from './active-requests.service';
import {environment} from '../../environments/environment';

describe('ActiveRequests', () => {
  let service: ActiveRequests;

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = TestBed.inject(ActiveRequests);
    (service as any).blockingRequests = 0; // To prevent tests from messing with each other we reset this
  });

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

  it('alerts subscribers on increment', (done) => {
    service.countBlockingRequests().subscribe((value) => {
      expect(value).toBe(1);
      done();
    });
    service._registerBlockingRequest();
  });

  it('knows whether a request is active', () => {
    service._registerBlockingRequest();
    service._registerBlockingRequest();
    expect(service.hasBlockingRequests).toBeTrue();
    service._unregisterBlockingRequest();
    expect(service.hasBlockingRequests).toBeTrue();
    service._unregisterBlockingRequest();
    expect(service.hasBlockingRequests).toBeFalse();
  });

  it('alerts subscribers on decrement', (done) => {
    (service as any).blockingRequests = 1;
    service.countBlockingRequests().subscribe((value) => {
      expect(value).toBe(0);
      done();
    });
    service._unregisterBlockingRequest();
  });

  it('errors when decremented below 0 in dev mode', () => {
    environment.production = false;
    expect(() => service._unregisterBlockingRequest()).toThrowError('Cannot decrease number of active requests below 0');
  });

  it('it warns when decremented below 0 in prod mode', () => {
    let errorMessage;
    environment.production = true;
    const consoleWarning = spyOn(console, 'warn').and.callFake((arg: string) => errorMessage = arg);
    service._unregisterBlockingRequest();
    expect(consoleWarning).toHaveBeenCalled();
    expect(errorMessage).toContain('Cannot decrease number of active requests below 0');
  });
});