// @vitest-environment jsdom

import { fireEvent, render, screen, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { useState } from 'react';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

import { ThemedModal } from '../src/components/modal/ThemedModal';

function ModalHarness({ noFocusableContent = false }) {
  const [open, setOpen] = useState(false);

  return (
    <>
      <button type="button" onClick={() => setOpen(true)}>
        打开弹窗
      </button>
      <ThemedModal
        open={open}
        onClose={() => setOpen(false)}
        ariaLabel="测试弹窗"
      >
        {noFocusableContent ? (
          <p>没有可聚焦控件</p>
        ) : (
          <>
            <button type="button" onClick={() => setOpen(false)}>
              取消
            </button>
            <button type="button">确认</button>
          </>
        )}
      </ThemedModal>
    </>
  );
}

describe('ThemedModal', () => {
  beforeEach(() => {
    vi.spyOn(HTMLElement.prototype, 'getClientRects').mockImplementation(
      () =>
        [
          {
            width: 1,
            height: 1,
            top: 0,
            right: 1,
            bottom: 1,
            left: 0,
            x: 0,
            y: 0,
            toJSON: () => ({}),
          },
        ] as unknown as DOMRectList,
    );
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('moves focus into the dialog, traps Tab, and restores the opener after close', async () => {
    const user = userEvent.setup();
    render(<ModalHarness />);

    const opener = screen.getByRole('button', { name: '打开弹窗' });
    await user.click(opener);

    const cancel = await screen.findByRole('button', { name: '取消' });
    const confirm = screen.getByRole('button', { name: '确认' });
    await waitFor(() => expect(document.activeElement).toBe(cancel));

    await user.tab();
    expect(document.activeElement).toBe(confirm);
    await user.tab();
    expect(document.activeElement).toBe(cancel);
    await user.tab({ shift: true });
    expect(document.activeElement).toBe(confirm);

    await user.keyboard('{Escape}');
    await waitFor(() => expect(screen.queryByRole('dialog')).toBeNull());
    expect(document.activeElement).toBe(opener);
  });

  it('focuses the dialog itself when it has no focusable content', async () => {
    const user = userEvent.setup();
    render(<ModalHarness noFocusableContent />);

    await user.click(screen.getByRole('button', { name: '打开弹窗' }));

    const dialog = await screen.findByRole('dialog', { name: '测试弹窗' });
    await waitFor(() => expect(document.activeElement).toBe(dialog));
  });

  it('restores focus after a backdrop close', async () => {
    const user = userEvent.setup();
    render(<ModalHarness />);

    const opener = screen.getByRole('button', { name: '打开弹窗' });
    await user.click(opener);

    const dialog = await screen.findByRole('dialog', { name: '测试弹窗' });
    fireEvent.click(dialog.parentElement!);

    await waitFor(() => expect(screen.queryByRole('dialog')).toBeNull());
    expect(document.activeElement).toBe(opener);
  });
});