// src/App.test.tsx
import React from 'react';
import { render, screen, waitFor, fireEvent, within, act } from '@testing-library/react';
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { MemoryRouter } from 'react-router-dom';
import App from './App';
import * as aiApiClient from './services/aiApiClient'; // Import aiApiClient
import * as apiClient from './services/apiClient';
import { AppProviders } from './providers/AppProviders';
import type { Flyer, UserProfile } from './types';
import {
  createMockFlyer,
  createMockUserProfile,
  createMockUser,
} from './tests/utils/mockFactories';
import {
  mockUseAuth,
  mockUseFlyers,
  mockUseMasterItems,
  mockUseUserData,
  mockUseFlyerItems,
} from './tests/setup/mockHooks';
import { useAppInitialization } from './hooks/useAppInitialization';

// Mock top-level components rendered by App's routes

// Mock pdfjs-dist to prevent the "DOMMatrix is not defined" error in JSDOM.
// This must be done in any test file that imports App.tsx.
vi.mock('pdfjs-dist', () => ({
  // pdfjsLib: { GlobalWorkerOptions: { workerSrc: '' } },
  GlobalWorkerOptions: { workerSrc: '' },
  getDocument: vi.fn(() => ({
    promise: Promise.resolve({ getPage: vi.fn() }),
  })),
}));

// Mock the new config module
vi.mock('./config', () => ({
  default: {
    app: { version: '20250101-1200:abc1234:1.0.0', commitMessage: 'Initial commit', commitUrl: '#' },
    google: { mapsEmbedApiKey: 'mock-key' },
  },
}));

// Explicitly mock the hooks to ensure the component uses our spies
vi.mock('./hooks/useFlyers', async () => {
  const hooks = await import('./tests/setup/mockHooks');
  return { useFlyers: hooks.mockUseFlyers };
});

vi.mock('./hooks/useFlyerItems', async () => {
  const hooks = await import('./tests/setup/mockHooks');
  return { useFlyerItems: hooks.mockUseFlyerItems };
});

vi.mock('./hooks/useAppInitialization');
const mockedUseAppInitialization = vi.mocked(useAppInitialization);

vi.mock('./hooks/useAuth', async () => {
  const hooks = await import('./tests/setup/mockHooks');
  return { useAuth: hooks.mockUseAuth };
});

vi.mock('./components/Footer', async () => {
  const { MockFooter } = await import('./tests/utils/componentMocks');
  return { Footer: MockFooter };
});

vi.mock('./components/Header', async () => {
  const { MockHeader } = await import('./tests/utils/componentMocks');
  return { Header: MockHeader };
});

vi.mock('./pages/HomePage', async () => {
  const { MockHomePage } = await import('./tests/utils/componentMocks');
  return { HomePage: MockHomePage };
});

vi.mock('./pages/admin/AdminPage', async () => {
  const { MockAdminPage } = await import('./tests/utils/componentMocks');
  return { AdminPage: MockAdminPage };
});

vi.mock('./pages/admin/CorrectionsPage', async () => {
  const { MockCorrectionsPage } = await import('./tests/utils/componentMocks');
  return { CorrectionsPage: MockCorrectionsPage };
});

vi.mock('./pages/admin/AdminStatsPage', async () => {
  const { MockAdminStatsPage } = await import('./tests/utils/componentMocks');
  return { AdminStatsPage: MockAdminStatsPage };
});

vi.mock('./pages/VoiceLabPage', async () => {
  const { MockVoiceLabPage } = await import('./tests/utils/componentMocks');
  return { VoiceLabPage: MockVoiceLabPage };
});

vi.mock('./pages/ResetPasswordPage', async () => {
  const { MockResetPasswordPage } = await import('./tests/utils/componentMocks');
  return { ResetPasswordPage: MockResetPasswordPage };
});

vi.mock('./pages/admin/components/ProfileManager', async () => {
  const { MockProfileManager } = await import('./tests/utils/componentMocks');
  return { ProfileManager: MockProfileManager };
});

vi.mock('./features/voice-assistant/VoiceAssistant', async () => {
  const { MockVoiceAssistant } = await import('./tests/utils/componentMocks');
  return { VoiceAssistant: MockVoiceAssistant };
});

vi.mock('./components/FlyerCorrectionTool', async () => {
  const { MockFlyerCorrectionTool } = await import('./tests/utils/componentMocks');
  return { FlyerCorrectionTool: MockFlyerCorrectionTool };
});

vi.mock('./components/WhatsNewModal', async () => {
  const { MockWhatsNewModal } = await import('./tests/utils/componentMocks');
  return { WhatsNewModal: MockWhatsNewModal };
});

vi.mock('./layouts/MainLayout', async () => {
  const { MockMainLayout } = await import('./tests/utils/componentMocks');
  return { MainLayout: MockMainLayout };
});

vi.mock('./components/AppGuard', async () => {
  // We need to use the real useModal hook inside our mock AppGuard
  const { useModal } = await vi.importActual<typeof import('./hooks/useModal')>('./hooks/useModal');
  return {
    AppGuard: ({ children }: { children: React.ReactNode }) => {
      const { isModalOpen } = useModal();
      return (
        <div data-testid="app-guard-mock">
          {children}
          {isModalOpen('whatsNew') && <div data-testid="whats-new-modal-mock" />}
        </div>
      );
    },
  };
});

const mockedAiApiClient = vi.mocked(aiApiClient);
const mockedApiClient = vi.mocked(apiClient);

const mockFlyers: Flyer[] = [
  createMockFlyer({ flyer_id: 1, store: { store_id: 1, name: 'Old Store' } }),
  createMockFlyer({ flyer_id: 2, store: { store_id: 2, name: 'Another Store' } }),
];

describe('App Component', () => {
  beforeEach(() => {
    console.log('[TEST DEBUG] beforeEach: Clearing mocks and setting up defaults');
    vi.clearAllMocks();
    // Default auth state: loading or guest
    // Mock the login function to simulate a successful login. Signature: (token, profile)
    const mockLogin = vi.fn(async (_token: string, _profile?: UserProfile) => {
      await act(async () => {
        // Simulate fetching profile after login
        const profileResponse = await mockedApiClient.getAuthenticatedUserProfile();
        const userProfileData: UserProfile = await profileResponse.json();
        mockUseAuth.mockReturnValue({
          userProfile: userProfileData,
          authStatus: 'AUTHENTICATED',
          isLoading: false,
          login: mockLogin, // Self-reference the mock
          logout: vi.fn(),
          updateProfile: vi.fn(),
        });
      });
    });
    mockUseAuth.mockReturnValue({
      userProfile: null,
      authStatus: 'SIGNED_OUT',
      isLoading: false, // Start with isLoading: false for most tests
      login: mockLogin,
      logout: vi.fn(),
      updateProfile: vi.fn(),
    });

    // Default data states for the new hooks
    mockUseFlyers.mockReturnValue({
      flyers: mockFlyers,
      isLoadingFlyers: false,
    });
    mockUseMasterItems.mockReturnValue({
      masterItems: [],
      isLoading: false,
    });
    mockUseUserData.mockReturnValue({
      watchedItems: [],
      shoppingLists: [],
      setWatchedItems: vi.fn(),
      setShoppingLists: vi.fn(),
    });
    mockUseFlyerItems.mockReturnValue({
      flyerItems: [],
      isLoading: false,
      error: null,
    });
    mockedUseAppInitialization.mockReturnValue({ isDarkMode: false, unitSystem: 'imperial' });

    // Default mocks for API calls
    // Use mockImplementation to create a new Response object for each call,
    // preventing "Body has already been read" errors.
    // Use mockImplementation to create a new Response object for each call,
    // preventing "Body has already been read" errors.
    mockedApiClient.fetchFlyers.mockImplementation(() =>
      Promise.resolve(new Response(JSON.stringify([]))),
    );
    // Mock getAuthenticatedUserProfile as it's called by useAuth's checkAuthToken and login
    mockedApiClient.getAuthenticatedUserProfile.mockImplementation(() =>
      Promise.resolve(
        new Response(
          JSON.stringify(
            createMockUserProfile({
              user: { user_id: 'test-user-id', email: 'test@example.com' },
              full_name: 'Test User',
              role: 'user',
              points: 0,
            }),
          ),
        ),
      ),
    );
    mockedApiClient.fetchMasterItems.mockImplementation(() =>
      Promise.resolve(new Response(JSON.stringify([]))),
    );
    mockedApiClient.fetchWatchedItems.mockImplementation(() =>
      Promise.resolve(new Response(JSON.stringify([]))),
    );
    mockedApiClient.fetchShoppingLists.mockImplementation(() =>
      Promise.resolve(new Response(JSON.stringify([]))),
    );
    mockedAiApiClient.rescanImageArea.mockResolvedValue(
      new Response(JSON.stringify({ text: 'mocked text' })),
    ); // Mock for FlyerCorrectionTool
    console.log('[TEST DEBUG] beforeEach: Setup complete');
  });

  const renderApp = (initialEntries = ['/']) => {
    return render(
      <MemoryRouter initialEntries={initialEntries}>
        <AppProviders>
          <App />
        </AppProviders>
      </MemoryRouter>,
    );
  };

  it('should render the main layout and header', async () => {
    // Simulate the auth hook finishing its initial check
    mockedUseAppInitialization.mockReturnValue({ isDarkMode: false, unitSystem: 'imperial' });
    mockUseAuth.mockReturnValue({
      userProfile: null,
      authStatus: 'SIGNED_OUT',
      isLoading: false,
      login: vi.fn(),
      logout: vi.fn(),
      updateProfile: vi.fn(),
    });

    renderApp();
    await waitFor(() => {
      expect(screen.getByTestId('app-guard-mock')).toBeInTheDocument();
      expect(screen.getByTestId('header-mock')).toBeInTheDocument();
      // Check that the main layout and home page are rendered for the root path
      expect(screen.getByTestId('main-layout-mock')).toBeInTheDocument();
      expect(screen.getByTestId('home-page-mock')).toBeInTheDocument();
    });
  });

  it('should render the footer', async () => {
    renderApp();
    await waitFor(() => {
      // This test will pass because we added the mock for the Footer component
      expect(screen.getByTestId('footer-mock')).toBeInTheDocument();
      expect(screen.getByText('Mock Footer')).toBeInTheDocument();
    });
  });

  it('should render the BulkImporter for an admin user', async () => {
    console.log('[TEST DEBUG] Test Start: should render the BulkImporter for an admin user');
    const mockAdminProfile: UserProfile = createMockUserProfile({
      user: { user_id: 'admin-id', email: 'admin@example.com' },
      role: 'admin',
    });

    // Force the auth hook to return an authenticated admin user
    mockUseAuth.mockReturnValue({
      userProfile: mockAdminProfile,
      authStatus: 'AUTHENTICATED',
      isLoading: false,
      login: vi.fn(),
      logout: vi.fn(),
      updateProfile: vi.fn(),
    });

    console.log('[TEST DEBUG] Rendering App with /admin route');
    renderApp(['/admin']);

    await waitFor(() => {
      console.log('[TEST DEBUG] Waiting for admin-page-mock');
      expect(screen.getByTestId('header-mock')).toBeInTheDocument();
      expect(screen.getByTestId('admin-page-mock')).toBeInTheDocument();
    });
  });

  it('should show a welcome message when no flyer is selected', async () => {
    // Simulate the auth hook finishing its initial check
    mockUseAuth.mockReturnValue({
      userProfile: null,
      authStatus: 'SIGNED_OUT',
      isLoading: false,
      login: vi.fn(),
      logout: vi.fn(),
      updateProfile: vi.fn(),
    });

    renderApp();
    await waitFor(() => {
      // The welcome message is inside HomePage, which is now mocked. We check for the mock instead.
      expect(screen.getByTestId('home-page-mock')).toBeInTheDocument();
    });
  });

  it('should render the admin page on the /admin route', async () => {
    const mockAdminProfile: UserProfile = createMockUserProfile({
      user: createMockUser({ user_id: 'admin-id', email: 'admin@example.com' }),
      role: 'admin',
    });

    // Directly set the auth state via the mocked hook
    mockUseAuth.mockReturnValue({
      userProfile: mockAdminProfile,
      authStatus: 'AUTHENTICATED',
      isLoading: false,
      login: vi.fn(),
      logout: vi.fn(),
      updateProfile: vi.fn(),
    });

    console.log('[TEST DEBUG] Rendering App with /admin route');
    renderApp(['/admin']);

    console.log('[TEST DEBUG] Waiting for admin-page-mock');
    expect(await screen.findByTestId('admin-page-mock')).toBeInTheDocument();
  });

  it('should render the reset password page on the correct route', async () => {
    renderApp(['/reset-password/some-token']);

    await waitFor(() => {
      expect(screen.getByTestId('reset-password-page-mock')).toBeInTheDocument();
    });
  });

  describe('Flyer Selection from URL', () => {
    it('should select a flyer when flyerId is present in the URL', async () => {
      renderApp(['/flyers/2']);

      // The HomePage mock will be rendered. The important part is that the selection logic
      // in App.tsx runs and passes the correct `selectedFlyer` prop down.
      // Since HomePage is mocked, we can't see the direct result, but we can
      // infer that the logic ran without crashing and the correct route was matched.
      await waitFor(() => {
        expect(screen.getByTestId('home-page-mock')).toBeInTheDocument();
      });
    });

    it('should not select a flyer if the flyerId from the URL does not exist', async () => {
      // This test covers the `if (flyerToSelect)` branch in the useEffect.
      renderApp(['/flyers/999']); // 999 does not exist in mockFlyers

      await waitFor(() => {
        expect(screen.getByTestId('home-page-mock')).toBeInTheDocument();
      });
      // The main assertion is that no error is thrown.
    });

    it('should select the first flyer if no flyer is selected and flyers are available', async () => {
      renderApp(['/']);

      await waitFor(() => {
        expect(screen.getByTestId('home-page-mock')).toBeInTheDocument();
      });
    });
  });

  describe('Modal Interactions', () => {
    it('should open and close the ProfileManager modal', async () => {
      console.log('[TEST DEBUG] Test Start: should open and close the ProfileManager modal');
      renderApp();
      expect(screen.queryByTestId('profile-manager-mock')).not.toBeInTheDocument();

      // Open modal
      fireEvent.click(screen.getByText('Open Profile'));
      expect(await screen.findByTestId('profile-manager-mock')).toBeInTheDocument();

      console.log('[TEST DEBUG] ProfileManager modal opened. Now closing...');
      // Close modal
      fireEvent.click(screen.getByText('Close Profile'));
      await waitFor(() => {
        expect(screen.queryByTestId('profile-manager-mock')).not.toBeInTheDocument();
      });
      console.log('[TEST DEBUG] ProfileManager modal closed.');
    });

    it('should open and close the VoiceAssistant modal for authenticated users', async () => {
      console.log('[TEST DEBUG] Test Start: should open and close the VoiceAssistant modal');
      mockUseAuth.mockReturnValue({
        userProfile: createMockUserProfile({
          role: 'user',
          user: { user_id: '1', email: 'test@test.com' },
        }),
        authStatus: 'AUTHENTICATED',
        isLoading: false,
        login: vi.fn(),
        logout: vi.fn(),
        updateProfile: vi.fn(),
      });
      console.log('[TEST DEBUG] Rendering App');
      renderApp();
      expect(screen.queryByTestId('voice-assistant-mock')).not.toBeInTheDocument();

      // Open modal
      console.log('[TEST DEBUG] Clicking Open Voice Assistant');
      fireEvent.click(screen.getByText('Open Voice Assistant'));

      console.log('[TEST DEBUG] Waiting for voice-assistant-mock');
      expect(await screen.findByTestId('voice-assistant-mock', {}, { timeout: 3000 })).toBeInTheDocument();

      // Close modal
      fireEvent.click(screen.getByText('Close Voice Assistant'));
      await waitFor(() => {
        expect(screen.queryByTestId('voice-assistant-mock')).not.toBeInTheDocument();
      });
    });

    it('should not render the FlyerCorrectionTool if no flyer is selected', () => {
      mockUseFlyers.mockReturnValue({ flyers: [], isLoadingFlyers: false });
      renderApp();
      // Try to open the modal via the mocked HomePage button
      fireEvent.click(screen.getByText('Open Correction Tool'));
      expect(screen.queryByTestId('flyer-correction-tool-mock')).not.toBeInTheDocument();
    });

    it('should open and close the FlyerCorrectionTool modal', async () => {
      renderApp();
      expect(screen.queryByTestId('flyer-correction-tool-mock')).not.toBeInTheDocument();

      // Open modal
      fireEvent.click(screen.getByText('Open Correction Tool'));
      expect(await screen.findByTestId('flyer-correction-tool-mock')).toBeInTheDocument();

      // Close modal
      fireEvent.click(screen.getByText('Close Correction'));
      await waitFor(() => {
        expect(screen.queryByTestId('flyer-correction-tool-mock')).not.toBeInTheDocument();
      });
    });

    it('should render admin sub-routes correctly', async () => {
      console.log('[TEST DEBUG] Test Start: should render admin sub-routes correctly');
      const mockAdminProfile: UserProfile = createMockUserProfile({
        user: { user_id: 'admin-id', email: 'admin@example.com' },
        role: 'admin',
      });
      mockUseAuth.mockReturnValue({
        userProfile: mockAdminProfile,
        authStatus: 'AUTHENTICATED',
        isLoading: false,
        login: vi.fn(),
        logout: vi.fn(),
        updateProfile: vi.fn(),
      });

      console.log(
        'Testing admin sub-routes with renderApp wrapper to ensure ModalProvider context',
      );
      console.log('[TEST DEBUG] Rendering App with /admin/corrections');
      renderApp(['/admin/corrections']);

      await waitFor(() => {
        console.log('[TEST DEBUG] Waiting for corrections-page-mock');
        expect(screen.getByTestId('corrections-page-mock')).toBeInTheDocument();
      });
    });
  });

  describe('Flyer Correction Tool Data Handling', () => {
    it('should handle store name extraction from the correction tool', async () => {
      // Ensure flyers are present so a flyer is auto-selected
      mockUseFlyers.mockReturnValue({
        flyers: mockFlyers,
        isLoadingFlyers: false,
      });

      renderApp();
      fireEvent.click(screen.getByText('Open Correction Tool'));
      const correctionTool = await screen.findByTestId(
        'flyer-correction-tool-mock',
        {},
        { timeout: 2000 },
      );
      // We trigger the callback from the mock and ensure it doesn't crash.
      fireEvent.click(within(correctionTool).getByText('Extract Store'));
      // The test passes if no errors are thrown here.
    });

    it('should handle date extraction from the correction tool', async () => {
      // Ensure flyers are present so a flyer is auto-selected
      mockUseFlyers.mockReturnValue({
        flyers: mockFlyers,
        isLoadingFlyers: false,
      });

      renderApp();
      fireEvent.click(screen.getByText('Open Correction Tool'));
      const correctionTool = await screen.findByTestId(
        'flyer-correction-tool-mock',
        {},
        { timeout: 2000 },
      );
      fireEvent.click(within(correctionTool).getByText('Extract Dates'));
      // The test passes if no errors are thrown here, covering the 'dates' branch.
    });
  });

  describe('Profile and Login Handlers', () => {
    it('should call updateProfile when handleProfileUpdate is triggered', async () => {
      console.log(
        '[TEST DEBUG] Test Start: should call updateProfile when handleProfileUpdate is triggered',
      );
      const mockUpdateProfile = vi.fn();
      // To test profile updates, the user must be authenticated to see the "Update Profile" button.
      mockUseAuth.mockReturnValue({
        userProfile: createMockUserProfile({
          user: { user_id: 'test-user', email: 'test@example.com' },
          role: 'user',
        }),
        authStatus: 'AUTHENTICATED',
        isLoading: false,
        login: vi.fn(),
        logout: vi.fn(),
        updateProfile: mockUpdateProfile,
      });

      console.log('[TEST DEBUG] Rendering App');
      renderApp();
      console.log('[TEST DEBUG] Opening Profile');
      fireEvent.click(screen.getByText('Open Profile'));
      const profileManager = await screen.findByTestId('profile-manager-mock');
      console.log('[TEST DEBUG] Clicking Update Profile');
      fireEvent.click(within(profileManager).getByText('Update Profile'));

      await waitFor(() => {
        console.log('[TEST DEBUG] Checking mockUpdateProfile calls:', mockUpdateProfile.mock.calls);
        expect(mockUpdateProfile).toHaveBeenCalledWith(
          expect.objectContaining({ full_name: 'Updated' }),
        );
      });
    });

    it('should set an error state if login fails inside handleLoginSuccess', async () => {
      console.log(
        '[TEST DEBUG] Test Start: should set an error state if login fails inside handleLoginSuccess',
      );
      const mockLogin = vi.fn().mockRejectedValue(new Error('Login failed'));
      mockUseAuth.mockReturnValue({
        userProfile: null,
        authStatus: 'SIGNED_OUT',
        isLoading: false,
        login: mockLogin,
        logout: vi.fn(),
        updateProfile: vi.fn(),
      });
      // Mock the login function to simulate a successful login. Signature: (token, profile)
      const mockLoginSuccess = vi.fn(async (_token: string, _profile?: UserProfile) => {
        // Simulate fetching profile after login
        const profileResponse = await mockedApiClient.getAuthenticatedUserProfile();
        const userProfileData: UserProfile = await profileResponse.json();
        mockUseAuth.mockReturnValue({ ...mockUseAuth(), userProfile: userProfileData, authStatus: 'AUTHENTICATED' });
      });

      console.log('[TEST DEBUG] Rendering App');
      renderApp();
      console.log('[TEST DEBUG] Opening Profile');
      fireEvent.click(screen.getByText('Open Profile'));
      const loginButton = await screen.findByRole('button', { name: 'Login' });
      console.log('[TEST DEBUG] Clicking Login');
      fireEvent.click(loginButton);

      // We need to wait for the async login function to be called and reject.
      await waitFor(() => {
        console.log('[TEST DEBUG] Checking mockLogin calls:', mockLogin.mock.calls);
        expect(mockLogin).toHaveBeenCalled();
      });
    });
  });

  describe("Version Display and What's New", () => {
    beforeEach(() => {
      vi.mock('./config', () => ({
        default: {
          app: {
            version: '2.0.0',
            commitMessage: 'A new version!',
            commitUrl: 'http://example.com/commit/2.0.0',
          },
        },
      }));
    });

    it('should display the version number and commit link', () => {
      renderApp();
      const versionLink = screen.getByText(`Version: 2.0.0`);
      expect(versionLink).toBeInTheDocument();
      expect(versionLink).toHaveAttribute('href', 'http://example.com/commit/2.0.0');
    });

    it('should open the "What\'s New" modal when the question mark icon is clicked', async () => {
      renderApp();
      const openButton = await screen.findByTitle("Show what's new in this version");
      fireEvent.click(openButton);
      // The mock AppGuard now renders the modal when it's open
      expect(await screen.findByTestId('whats-new-modal-mock')).toBeInTheDocument();
    });
  });
});