import { beforeEach, describe, expect, it, vi } from 'vitest';
import type { ReactElement } from 'react';
import { act, fireEvent, render as renderComponent, screen, waitFor } from '@testing-library/react';
import { MemoryRouter, useLocation } from 'react-router-dom';
import { TitleBar } from '@/components/layout/TitleBar';
import { CodingConversationHeader } from '@/pages/Chat/CodingConversationHeader';
import { useSettingsStore } from '@/stores/settings';

function render(ui: ReactElement) {
  return renderComponent(ui, { wrapper: ({ children }) => <MemoryRouter initialEntries={['/chat']}>{children}</MemoryRouter> });
}

function LocationPath() {
  return <span data-testid="location-path">{useLocation().pathname}</span>;
}

const invokeIpcMock = vi.hoisted(() => vi.fn());

vi.mock('@/lib/api-client', () => ({
  invokeIpc: (...args: unknown[]) => invokeIpcMock(...args),
}));

describe('TitleBar platform behavior', () => {
  beforeEach(() => {
    invokeIpcMock.mockReset();
    invokeIpcMock.mockResolvedValue(false);
    vi.mocked(window.electron.ipcRenderer.on).mockReset();
    useSettingsStore.setState({ sidebarCollapsed: false, classroomSidebarWidth: 171 });
  });

  it('extends the product surfaces through the macOS title bar', () => {
    window.electron.platform = 'darwin';

    render(<TitleBar integrated />);

    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('border-b');
    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('drag-region');
    expect(screen.getByTestId('product-titlebar')).toHaveClass('glass-surface', 'bg-background/70');
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('w-64', 'sidebar-glass-surface', 'border-r');
    expect(screen.getByTestId('titlebar-main-surface')).toHaveClass('border-b', 'bg-background', 'drag-region');
    expect(screen.getByTestId('titlebar-project-context')).not.toHaveClass('border-l');
    expect(screen.getByTestId('titlebar-project-context')).not.toHaveClass('translate-y-[3px]');
    expect(screen.getByTestId('titlebar-logo')).toHaveClass('absolute', 'top-1/2', 'bg-background');
    expect(screen.getByTestId('titlebar-logo')).toHaveStyle({ right: '0px' });
    expect(screen.getByTestId('titlebar-logo').querySelector('img')).toHaveAttribute('data-logo-source', 'original-wordmark');
    expect(screen.getByTestId('titlebar-sidebar-toggle-layer')).toHaveClass('no-drag', 'pointer-events-auto', 'fixed', 'left-0', 'top-0', 'z-[400]', 'h-10', 'w-[132px]');
    expect(screen.getByTestId('titlebar-sidebar-toggle')).toHaveClass('no-drag', 'pointer-events-auto', 'absolute', 'top-1', 'z-[401]', 'left-[88px]');
    expect(screen.getByTestId('titlebar-project-context')).toHaveTextContent('Makelore 工作台');
    expect(screen.queryByRole('button', { name: '打开项目位置' })).not.toBeInTheDocument();
    expect(screen.queryByRole('button', { name: '后退' })).not.toBeInTheDocument();
    expect(screen.queryByRole('button', { name: '前进' })).not.toBeInTheDocument();
    fireEvent.click(screen.getByRole('button', { name: '折叠侧栏' }));
    expect(useSettingsStore.getState().sidebarCollapsed).toBe(true);

    act(() => useSettingsStore.setState({ sidebarCollapsed: true }));

    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('w-[132px]');
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('border-r-0');
    expect(screen.getByTestId('product-titlebar')).toHaveClass('bg-background');
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('bg-background');
    expect(screen.getByTestId('product-titlebar')).toHaveClass('border-b');
    expect(screen.getByTestId('titlebar-main-surface')).toHaveClass('border-b-0');
    expect(screen.getByTestId('titlebar-sidebar-toggle')).toBeVisible();
  });

  it('keeps the collapsed sidebar expand control above the titlebar drag surfaces', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });

    render(<TitleBar integrated workspaceLayout />);

    const toggle = screen.getByRole('button', { name: '展开侧栏' });
    expect(screen.getByTestId('titlebar-sidebar-toggle-layer')).toContainElement(toggle);
    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('border-b');
    expect(toggle).toHaveClass('pointer-events-auto', 'z-[401]');

    fireEvent.click(toggle);
    expect(useSettingsStore.getState().sidebarCollapsed).toBe(false);
  });

  it('renders macOS drag region', () => {
    window.electron.platform = 'darwin';

    const { container } = render(<TitleBar />);

    expect(container.querySelector('.drag-region')).toBeInTheDocument();
    expect(screen.queryByTitle('Minimize')).not.toBeInTheDocument();
    expect(invokeIpcMock).toHaveBeenCalledWith('window:isFullScreen');
  });

  it('aligns the classroom title bar with one project sidebar and no duplicate branding', () => {
    window.electron.platform = 'darwin';

    render(<TitleBar integrated workspaceLayout />);

    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('glass-surface', 'border-b');
    expect(screen.getByTestId('product-titlebar')).toHaveClass('bg-transparent');
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: '171px', minWidth: '171px', flexBasis: '171px' });
    act(() => useSettingsStore.getState().setClassroomSidebarWidth(256));
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: '256px' });
    expect(screen.getByTestId('titlebar-main-surface')).toHaveClass('border-b-0');
    expect(screen.queryByTestId('titlebar-conversation-surface')).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-logo')).not.toBeInTheDocument();
    expect(screen.queryByRole('img', { name: 'Makelore logo' })).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-project-context')).not.toBeInTheDocument();
    expect(screen.getByRole('button', { name: '折叠侧栏' })).toBeEnabled();
    expect(screen.getByRole('button', { name: '返回首页' })).toBeEnabled();
    expect(screen.getByTestId('classroom-titlebar-navigation')).toHaveClass('pl-[88px]');
    expect(screen.getByTestId('titlebar-sidebar-toggle')).toHaveClass('right-2');
  });

  it('aligns fullscreen return with project buttons and restores native window-control space on exit', async () => {
    window.electron.platform = 'darwin';
    invokeIpcMock.mockResolvedValue(true);
    const unsubscribe = vi.fn();
    let notify: (...args: unknown[]) => void = () => {};
    vi.mocked(window.electron.ipcRenderer.on).mockImplementation((channel, callback) => {
      expect(channel).toBe('window:fullscreen-changed');
      notify = callback;
      return unsubscribe;
    });
    const { unmount } = render(<TitleBar integrated workspaceLayout />);
    const navigation = screen.getByTestId('classroom-titlebar-navigation');
    await waitFor(() => expect(navigation).toHaveClass('pl-3'));
    act(() => notify(false));
    expect(navigation).toHaveClass('pl-[88px]');
    act(() => notify(true));
    expect(navigation).toHaveClass('pl-3');
    unmount();
    expect(unsubscribe).toHaveBeenCalledOnce();
  });

  it('keeps a native fullscreen transition when an older initial query resolves later', async () => {
    window.electron.platform = 'darwin';
    let resolveQuery: (value: boolean) => void = () => {};
    invokeIpcMock.mockReturnValue(new Promise<boolean>((resolve) => { resolveQuery = resolve; }));
    let notify: (...args: unknown[]) => void = () => {};
    vi.mocked(window.electron.ipcRenderer.on).mockImplementation((_channel, callback) => {
      notify = callback;
      return vi.fn();
    });
    render(<TitleBar integrated workspaceLayout />);
    act(() => notify(true));
    await act(async () => resolveQuery(false));
    expect(screen.getByTestId('classroom-titlebar-navigation')).toHaveClass('pl-3');
  });

  it('keeps the native safe inset when an older preload rejects fullscreen events', () => {
    window.electron.platform = 'darwin';
    vi.mocked(window.electron.ipcRenderer.on).mockImplementation(() => { throw new Error('Invalid IPC channel'); });
    render(<TitleBar integrated workspaceLayout />);
    expect(screen.getByTestId('classroom-titlebar-navigation')).toHaveClass('pl-[88px]');
    expect(invokeIpcMock).not.toHaveBeenCalled();
  });

  it('renders the painting title bar as a transparent overlay with the logo at the window edge', () => {
    window.electron.platform = 'darwin';

    render(<TitleBar integrated overlay />);

    expect(screen.getByTestId('product-titlebar')).toHaveClass(
      'absolute',
      'inset-x-0',
      'top-0',
      'pointer-events-none',
      'bg-transparent',
    );
    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('relative');
    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('border-b', 'glass-surface');
    expect(screen.getByTestId('titlebar-main-surface')).toHaveClass(
      'pointer-events-none',
      'border-b-0',
      'bg-transparent',
    );
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('bg-transparent', 'border-r-0');
    expect(screen.getByTestId('titlebar-sidebar-surface')).not.toHaveClass('sidebar-glass-surface');
    expect(screen.getByTestId('titlebar-logo')).toHaveClass('bg-transparent');
    expect(screen.getByTestId('titlebar-logo')).toHaveStyle({ right: '0px' });
    expect(screen.getByTestId('titlebar-logo').querySelector('img')).toHaveClass('mix-blend-multiply');
    expect(screen.queryByTestId('titlebar-project-context')).not.toBeInTheDocument();
  });

  it('keeps only the product chrome when a workspace owns its navigation', () => {
    window.electron.platform = 'darwin';

    render(<TitleBar integrated overlay showSidebarControls={false} />);

    expect(screen.queryByTestId('titlebar-sidebar-surface')).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-sidebar-toggle')).not.toBeInTheDocument();
    expect(screen.getByTestId('titlebar-main-surface')).toBeInTheDocument();
    expect(screen.getByTestId('titlebar-logo')).toBeInTheDocument();
  });

  it('leaves the narrow Windows Canvas rail to the native window controls', () => {
    window.electron.platform = 'win32';

    render(<TitleBar integrated overlay showSidebarControls={false} />);

    expect(screen.queryByTestId('titlebar-sidebar-toggle')).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-logo')).not.toBeInTheDocument();
    expect(screen.getByTitle('Minimize')).toBeInTheDocument();
    expect(screen.getByTitle('Maximize')).toBeInTheDocument();
    expect(screen.getByTitle('Close')).toBeInTheDocument();
  });

  it('keeps an optional page title after the macOS traffic-light safe area', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });

    render(<TitleBar integrated pageTitle="页面标题" />);

    expect(screen.getByTestId('titlebar-page-title')).toHaveTextContent('页面标题');
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('w-[132px]');
    expect(screen.queryByTestId('titlebar-project-context')).not.toBeInTheDocument();
    expect(screen.getByTestId('titlebar-logo').querySelectorAll('img')).toHaveLength(1);
  });

  it('previews the collapsed sidebar on hover and pins it on click', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });
    const onSidebarPeekChange = vi.fn();

    render(<TitleBar integrated onSidebarPeekChange={onSidebarPeekChange} />);

    const toggle = screen.getByTestId('titlebar-sidebar-toggle');
    fireEvent.pointerEnter(toggle);
    expect(onSidebarPeekChange).toHaveBeenCalledWith(true, 'toggle');

    fireEvent.pointerLeave(toggle);
    expect(onSidebarPeekChange).toHaveBeenCalledWith(false, 'toggle');

    fireEvent.click(toggle);
    expect(useSettingsStore.getState().sidebarCollapsed).toBe(false);
  });

  it('keeps the classroom sidebar safe area fixed during preview and lets the student pin it', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });

    const { rerender } = render(<TitleBar integrated workspaceLayout sidebarPeekOpen={false} />);
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: '168px' });
    expect(screen.queryByTestId('titlebar-conversation-surface')).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-logo')).not.toBeInTheDocument();
    expect(screen.getByRole('button', { name: '展开侧栏' })).toHaveAttribute('aria-expanded', 'false');

    rerender(<TitleBar integrated workspaceLayout sidebarPeekOpen />);

    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: '168px' });
    expect(screen.queryByTestId('titlebar-conversation-surface')).not.toBeInTheDocument();
    expect(screen.queryByTestId('titlebar-logo')).not.toBeInTheDocument();
    const pinButton = screen.getByRole('button', { name: '固定侧栏' });
    expect(pinButton).toBeEnabled();
    expect(pinButton).toHaveAttribute('aria-expanded', 'true');
    fireEvent.click(pinButton);
    expect(useSettingsStore.getState().sidebarCollapsed).toBe(false);
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: '171px', minWidth: '171px', flexBasis: '171px' });
    expect(screen.getByRole('button', { name: '折叠侧栏' })).toBeEnabled();
  });

  it.each([
    ['darwin', 168, 168, 'pl-[88px]'],
    ['win32', 128, 88, 'pl-3'],
  ] as const)('keeps both %s navigation controls outside the conversation header at narrow and collapsed widths', (platform, narrowWidth, collapsedWidth, insetClass) => {
    window.electron.platform = platform;
    useSettingsStore.setState({ classroomSidebarWidth: 128 });
    render(<>
      <TitleBar integrated workspaceLayout />
      <CodingConversationHeader conversation={null} snapshot={null} onRename={vi.fn()} onAbort={vi.fn()} onRecover={vi.fn()} />
      <LocationPath />
    </>);

    const assertWidth = (width: number) => {
      expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveStyle({ width: `${width}px` });
      expect(screen.getByTestId('titlebar-sidebar-toggle-layer')).toHaveStyle({ width: `${width}px` });
      expect(screen.getByTestId('coding-conversation-header-titlebar')).toHaveStyle({ left: `${width}px` });
    };
    assertWidth(narrowWidth);
    const rail = screen.getByTestId('classroom-titlebar-navigation');
    expect(rail).toHaveClass(insetClass);
    expect(rail).toContainElement(screen.getByRole('button', { name: '返回首页' }));
    expect(rail).toContainElement(screen.getByRole('button', { name: '折叠侧栏' }));
    expect(screen.getByRole('button', { name: '返回首页' })).toHaveTextContent('');
    expect(screen.getAllByTestId('titlebar-sidebar-toggle')).toHaveLength(1);

    act(() => useSettingsStore.setState({ classroomSidebarWidth: 256 }));
    assertWidth(256);
    fireEvent.click(screen.getByRole('button', { name: '折叠侧栏' }));
    assertWidth(collapsedWidth);
    fireEvent.click(screen.getByRole('button', { name: '返回首页' }));
    expect(screen.getByTestId('location-path')).toHaveTextContent('/module-select');
  });

  it('preserves keyboard preview when focus moves between the classroom controls', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });
    const onSidebarPeekChange = vi.fn();
    render(<>
      <TitleBar integrated workspaceLayout sidebarPeekOpen onSidebarPeekChange={onSidebarPeekChange} />
      <button type="button">Outside navigation</button>
    </>);
    const toggle = screen.getByRole('button', { name: '固定侧栏' });
    const back = screen.getByRole('button', { name: '返回首页' });
    act(() => toggle.focus());
    expect(onSidebarPeekChange).toHaveBeenLastCalledWith(true, 'focus');
    onSidebarPeekChange.mockClear();
    act(() => back.focus());
    expect(onSidebarPeekChange).not.toHaveBeenCalledWith(false, 'focus');
    expect(onSidebarPeekChange).toHaveBeenLastCalledWith(true, 'focus');
    act(() => screen.getByRole('button', { name: 'Outside navigation' }).focus());
    expect(onSidebarPeekChange).toHaveBeenLastCalledWith(false, 'focus');

    const layer = screen.getByTestId('titlebar-sidebar-toggle-layer');
    fireEvent.pointerEnter(layer);
    fireEvent.pointerLeave(layer);
    expect(onSidebarPeekChange).toHaveBeenCalledWith(true, 'titlebar');
    expect(onSidebarPeekChange).toHaveBeenLastCalledWith(false, 'titlebar');
    expect(layer).toHaveStyle({ width: '168px' });
  });

  it('extends the ordinary titlebar sidebar surface during a hover preview', () => {
    window.electron.platform = 'darwin';
    useSettingsStore.setState({ sidebarCollapsed: true });

    const { rerender } = render(<TitleBar integrated sidebarPeekOpen={false} />);
    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('w-[132px]', 'border-r-0');

    rerender(<TitleBar integrated sidebarPeekOpen />);

    expect(screen.getByTestId('titlebar-sidebar-surface')).toHaveClass('w-64', 'sidebar-peek-surface', 'border-r');
    expect(screen.getByTestId('titlebar-sidebar-surface')).not.toHaveClass('sidebar-glass-surface');
    expect(screen.getByTestId('titlebar-sidebar-surface')).not.toHaveClass('border-r-0');
    expect(screen.getByTestId('product-titlebar')).not.toHaveClass('border-b');

    const onSidebarPeekChange = vi.fn();
    rerender(<TitleBar integrated sidebarPeekOpen onSidebarPeekChange={onSidebarPeekChange} />);
    const surface = screen.getByTestId('titlebar-sidebar-surface');
    fireEvent.pointerEnter(surface);
    fireEvent.pointerLeave(surface);
    expect(onSidebarPeekChange).toHaveBeenNthCalledWith(1, true, 'titlebar');
    expect(onSidebarPeekChange).toHaveBeenNthCalledWith(2, false, 'titlebar');
  });

  it('renders custom controls and reserves their space on Windows', async () => {
    window.electron.platform = 'win32';

    render(<TitleBar integrated />);

    expect(screen.getByTitle('Minimize')).toBeInTheDocument();
    expect(screen.getByTitle('Maximize')).toBeInTheDocument();
    expect(screen.getByTitle('Close')).toBeInTheDocument();
    expect(screen.getByTestId('titlebar-logo')).toHaveStyle({ right: '148px' });

    await waitFor(() => {
      expect(invokeIpcMock).toHaveBeenCalledWith('window:isMaximized');
    });
  });

  it('renders no custom title bar on Linux', () => {
    window.electron.platform = 'linux';

    const { container } = render(<TitleBar />);

    expect(container.firstChild).toBeNull();
    expect(screen.queryByTitle('Minimize')).not.toBeInTheDocument();
    expect(invokeIpcMock).not.toHaveBeenCalled();
  });
});