/**
 * Carousel Component Tests
 * 
 * 測試目標：
 * 1. 元件能正確渲染
 * 2. 元件能正確呼叫廠商 carousel.js
 * 3. 元件卸載時能正確 cleanup
 */

import React from 'react';
import { render, waitFor, cleanup as rtlCleanup } from '@testing-library/react';
import { Carousel } from '@/components/aia/carousel';
import * as vendorCarousel from '@vendor-web/js/patterns/carousel.js';

// Mock 廠商 carousel.js
jest.mock('@vendor-web/js/patterns/carousel.js', () => ({
  carousel: jest.fn(),
}));

describe('Carousel Component', () => {
  let mockCleanup: jest.Mock;

  beforeEach(() => {
    mockCleanup = jest.fn();
    (vendorCarousel.carousel as jest.Mock).mockReturnValue(mockCleanup);
  });

  afterEach(() => {
    rtlCleanup();
    jest.clearAllMocks();
  });

  it('應該渲染 carousel 結構', () => {
    const { container } = render(
      <Carousel>
        <div>Item 1</div>
        <div>Item 2</div>
      </Carousel>
    );

    expect(container.querySelector('.carousel')).toBeInTheDocument();
    expect(container.querySelector('.carousel-list')).toBeInTheDocument();
    expect(container.querySelectorAll('.carousel-control')).toHaveLength(2);
  });

  it('應該呼叫廠商 carousel 初始化函式', async () => {
    render(
      <Carousel>
        <div>Item 1</div>
      </Carousel>
    );

    await waitFor(() => {
      expect(vendorCarousel.carousel).toHaveBeenCalledTimes(1);
      expect(vendorCarousel.carousel).toHaveBeenCalledWith(
        expect.any(HTMLElement)
      );
    });
  });

  it('應該在元件卸載時呼叫 cleanup 函式', async () => {
    const { unmount } = render(
      <Carousel>
        <div>Item 1</div>
      </Carousel>
    );

    await waitFor(() => {
      expect(vendorCarousel.carousel).toHaveBeenCalled();
    });

    unmount();

    expect(mockCleanup).toHaveBeenCalledTimes(1);
  });

  it('應該能處理廠商 JS 未返回 cleanup 的情況', async () => {
    (vendorCarousel.carousel as jest.Mock).mockReturnValue(undefined);

    const { unmount } = render(
      <Carousel>
        <div>Item 1</div>
      </Carousel>
    );

    // 不應該拋出錯誤
    expect(() => unmount()).not.toThrow();
  });

  it('應該能接收並渲染 children', () => {
    const { getByText } = render(
      <Carousel>
        <div>Test Item 1</div>
        <div>Test Item 2</div>
        <div>Test Item 3</div>
      </Carousel>
    );

    expect(getByText('Test Item 1')).toBeInTheDocument();
    expect(getByText('Test Item 2')).toBeInTheDocument();
    expect(getByText('Test Item 3')).toBeInTheDocument();
  });
});