import { CLASS_ACTIVE, CLASS_PAGINATION, CLASS_PAGINATION_PAGE } from '../../../constants/classes';
import { fire, init } from '../../../test';


describe('Pagination', () => {
  test('can create pagination.', () => {
    const splide = init();
    const pagination = document.querySelector(`.${ CLASS_PAGINATION }`);
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    expect(pagination.children.length).toBe(splide.length);
    expect(items.length).toBe(splide.length);
  });

  test('can create pagination according to the perPage option.', () => {
    const splide = init({ perPage: 3 });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    expect(items.length).toBe(Math.ceil(splide.length / 3));
  });

  test('should not paginate if the `focus` option is available.', () => {
    const splide = init({ perPage: 3, focus: 'center' });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    expect(items.length).toBe(splide.length);
  });

  test('should omit unnecessary items when `focus` and `omitEnd` options are enabled.', () => {
    const splide = init({ perPage: 3, focus: 0, omitEnd: true });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    expect(items.length).not.toBe(splide.length);
    expect(items.length).toBe(splide.Components.Controller.getEnd() + 1);
  });

  test('can move the slider when the item is clicked.', () => {
    const splide = init({ speed: 0 });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    fire(items[1], 'click');
    expect(splide.index).toBe(1);

    fire(items[5], 'click');
    expect(splide.index).toBe(5);
  });

  test('can move the slider to the end index when the last item is clicked.', () => {
    const splide = init({ perPage: 3 });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    fire(items[items.length - 1], 'click');
    expect(splide.index).toBe(splide.Components.Controller.getEnd());
  });

  test('can update status classes by the index.', () => {
    const splide = init();
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    expect(items[0].classList.contains(CLASS_ACTIVE)).toBe(true);
    expect(items[0].getAttribute('aria-selected')).toBe('true');

    splide.go(2);

    expect(items[0].classList.contains(CLASS_ACTIVE)).toBe(false);
    expect(items[0].getAttribute('aria-selected')).toBeNull();
    expect(items[2].classList.contains(CLASS_ACTIVE)).toBe(true);
    expect(items[2].getAttribute('aria-selected')).toBe('true');
  });

  test('can update status classes by the page.', () => {
    const splide = init({ perPage: 3, speed: 0 });
    const items = document.getElementsByClassName(CLASS_PAGINATION_PAGE);

    splide.go(4); // page: 1

    expect(items[1].classList.contains(CLASS_ACTIVE)).toBe(true);
    expect(items[1].getAttribute('aria-selected')).toBe('true');

    splide.go(7); // end page

    expect(items[3].classList.contains(CLASS_ACTIVE)).toBe(true);
    expect(items[3].getAttribute('aria-selected')).toBe('true');
  });

  test('should remove the pagination on destroy.', () => {
    const splide = init();
    splide.destroy();

    const pagination = document.querySelector(`.${ CLASS_PAGINATION }`);
    expect(pagination).toBeNull();
  });
});