/* @vitest-environment jsdom */

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

import { EditorAgentDraftTextarea } from './EditorAgentDraftTextarea.tsx';

beforeEach(() => {
  vi.stubGlobal(
    'ResizeObserver',
    class ResizeObserver {
      observe() {}
      unobserve() {}
      disconnect() {}
    },
  );
});

function DraftHarness({
  onPaste,
  onSubmitRequest,
}: {
  onPaste?: (event: ClipboardEvent) => void;
  onSubmitRequest: () => void;
}) {
  const [value, setValue] = useState('');
  return (
    <EditorAgentDraftTextarea
      value={value}
      onValueChange={setValue}
      onPaste={onPaste}
      onSubmitRequest={onSubmitRequest}
    />
  );
}

describe('EditorAgentDraftTextarea', () => {
  it('forwards controlled draft edits and paste events', async () => {
    const user = userEvent.setup();
    const onPaste = vi.fn((event: ClipboardEvent) => event.preventDefault());
    render(<DraftHarness onPaste={onPaste} onSubmitRequest={vi.fn()} />);

    const editor = screen.getByRole('textbox', {
      name: '发送给画布 Agent',
    });
    await user.click(editor);
    fireEvent.paste(editor, {
      clipboardData: {
        files: [],
        getData: () => '',
        items: [],
        types: [],
      },
    });
    expect(onPaste).toHaveBeenCalledTimes(1);
  });

  it('submits on Enter but preserves Shift+Enter and IME confirmation', async () => {
    const user = userEvent.setup();
    const onSubmitRequest = vi.fn();
    const { container } = render(
      <DraftHarness onSubmitRequest={onSubmitRequest} />,
    );

    const editor = screen.getByRole('textbox', {
      name: '发送给画布 Agent',
    });
    await user.click(editor);
    fireEvent.keyDown(editor, { key: 'Enter', shiftKey: true });
    expect(onSubmitRequest).not.toHaveBeenCalled();

    fireEvent.keyDown(editor, {
      key: 'Enter',
      isComposing: true,
      keyCode: 229,
    });
    expect(onSubmitRequest).not.toHaveBeenCalled();

    fireEvent.keyDown(editor, { key: 'Enter' });
    expect(onSubmitRequest).toHaveBeenCalledTimes(1);
    expect(container.querySelector('form')).toBeNull();
    expect(container.querySelector('textarea')).toBeNull();
  });
});