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

import { LangSwitchBtn } from './lang-switch-btn';
import { LanguageManager } from '../../services/language-manager';
import { By } from '@angular/platform-browser';

describe('LangSwitchBtn', () => {
  let component: LangSwitchBtn;
  let fixture: ComponentFixture<LangSwitchBtn>;
  let languageManager: jasmine.SpyObj<LanguageManager>;

  beforeEach(async () => {
    languageManager = jasmine.createSpyObj(LanguageManager, ['selectedLanguage$', 'setLanguage']);
    await TestBed.configureTestingModule({
      imports: [LangSwitchBtn],
      providers: [{ provide: LanguageManager, useValue: languageManager }],
    }).compileComponents();

    fixture = TestBed.createComponent(LangSwitchBtn);
    component = fixture.componentInstance;
  });

  it('should create', () => {
    fixture.detectChanges();
    expect(component).toBeTruthy();
  });

  it('should show spanish flag', () => {
    languageManager.selectedLanguage$.and.returnValue('en');
    fixture.detectChanges();
    const img = fixture.debugElement.query(By.css('img')).attributes;
    expect(img['src']).toEqual('images/sp_flag.png');
  });

  it('should updateLanguage on click', () => {
    const updateLanguageSpy = spyOn(component, 'updateLanguage').and.callThrough();
    languageManager.selectedLanguage$.and.returnValue('en');
    fixture.detectChanges();
    const container = fixture.debugElement.query(By.css('.container'));
    container.triggerEventHandler('click');
    expect(updateLanguageSpy).toHaveBeenCalledTimes(1);
  });
});