import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { render, screen, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { MemoryRouter, Routes, Route } from 'react-router-dom';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import { LoginPage } from '../pages/LoginPage';
import { RegisterPage } from '../pages/RegisterPage';
import { ForgotPasswordPage } from '../pages/ForgotPasswordPage';
import { ResetPasswordPage } from '../pages/ResetPasswordPage';
import { VerifyEmailPage } from '../pages/VerifyEmailPage';

// Mock authStore
vi.mock('@/features/auth/store/authStore', () => ({
  useAuthStore: Object.assign(
    vi.fn(() => ({
      isAuthenticated: false,
      isLoading: false,
      user: null,
      login: vi.fn(),
      register: vi.fn(),
      clearError: vi.fn(),
      error: null,
      checkAuthStatus: vi.fn(),
    })),
    {
      getState: () => ({
        isAuthenticated: false,
        user: null,
      }),
    },
  ),
}));

// Mock useLogin - returns react-query mutation shape
vi.mock('../hooks/useLogin', () => ({
  useLogin: () => ({
    mutate: vi.fn(),
    isPending: false,
    error: null,
    isSuccess: false,
  }),
}));

// Mock useRegister
vi.mock('../hooks/useRegister', () => ({
  useRegister: () => ({
    mutate: vi.fn(),
    isPending: false,
    error: null,
    isSuccess: false,
  }),
}));

// Mock useUsernameAvailability
vi.mock('../hooks/useUsernameAvailability', () => ({
  useUsernameAvailability: () => ({ available: true, checking: false }),
}));

// Mock usePasswordReset
vi.mock('../hooks/usePasswordReset', () => ({
  usePasswordReset: () => ({
    handleRequestReset: vi.fn(),
    handleReset: vi.fn(),
    loading: false,
    error: null,
    success: false,
  }),
}));

// Mock authApi for VerifyEmailPage
vi.mock('@/services/api/auth', () => ({
  authApi: {
    verifyEmail: vi.fn().mockResolvedValue({ message: 'Email verified' }),
    resendVerification: vi.fn().mockResolvedValue({ message: 'Email sent' }),
    checkUsername: vi.fn().mockResolvedValue({ available: true, username: 'test' }),
  },
}));

// Mock useFormValidation (used by LoginForm and RegisterForm)
vi.mock('@/hooks/useFormValidation', () => ({
  useFormValidation: () => ({
    validate: vi.fn(),
    errors: [],
    isValidating: false,
  }),
}));

// Mock useToast
vi.mock('@/hooks/useToast', () => ({
  useToast: () => ({
    toast: vi.fn(),
  }),
}));

const mockNavigate = vi.fn();
vi.mock('react-router-dom', async () => {
  const actual = await vi.importActual('react-router-dom');
  return {
    ...actual,
    useNavigate: () => mockNavigate,
  };
});

// Helper function to render with router and QueryClient
const renderWithRouter = (
  initialEntries: string[],
  path: string,
  component: React.ReactElement,
) => {
  const queryClient = new QueryClient({
    defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
  });
  return render(
    <QueryClientProvider client={queryClient}>
      <MemoryRouter initialEntries={initialEntries}>
        <Routes>
          <Route path={path} element={component} />
        </Routes>
      </MemoryRouter>
    </QueryClientProvider>,
  );
};

describe('Auth Pages Integration Tests', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    mockNavigate.mockClear();
    localStorage.clear();
  });

  afterEach(() => {
    localStorage.clear();
  });

  describe('Navigation between pages', () => {
    it('should navigate from login to register page', () => {
      renderWithRouter(['/login'], '/login', <LoginPage />);

      // LoginPage footer link: "Don't have an account? Sign up"
      const registerLink = screen.getByText(/sign up/i);
      expect(registerLink).toBeInTheDocument();
      expect(registerLink.closest('a')).toHaveAttribute('href', '/register');
    });

    it('should navigate from login to forgot password page', () => {
      renderWithRouter(['/login'], '/login', <LoginPage />);

      const forgotPasswordLink = screen.getByText(/forgot password/i);
      expect(forgotPasswordLink).toBeInTheDocument();
      expect(forgotPasswordLink.closest('a')).toHaveAttribute(
        'href',
        '/forgot-password',
      );
    });

    it('should navigate from register to login page', () => {
      renderWithRouter(['/register'], '/register', <RegisterPage />);

      const loginLink = screen.getByText(/se connecter/i);
      expect(loginLink).toBeInTheDocument();
      expect(loginLink.closest('a')).toHaveAttribute('href', '/login');
    });

    it('should navigate from forgot password to login page', () => {
      renderWithRouter(
        ['/forgot-password'],
        '/forgot-password',
        <ForgotPasswordPage />,
      );

      const loginLink = screen.getByText('Retour à la connexion');
      expect(loginLink).toBeInTheDocument();
      expect(loginLink.closest('a')).toHaveAttribute('href', '/login');
    });
  });

  describe('Page rendering', () => {
    it('should render login page correctly', () => {
      renderWithRouter(['/login'], '/login', <LoginPage />);

      expect(screen.getByText('Welcome Back')).toBeInTheDocument();
      expect(screen.getByLabelText('Email')).toBeInTheDocument();
      expect(screen.getByLabelText('Password')).toBeInTheDocument();
      expect(
        screen.getByRole('button', { name: 'Sign In' }),
      ).toBeInTheDocument();
    });

    it('should render register page correctly', () => {
      renderWithRouter(['/register'], '/register', <RegisterPage />);

      expect(screen.getByText('Inscription')).toBeInTheDocument();
      expect(screen.getByLabelText('Email')).toBeInTheDocument();
      expect(screen.getByLabelText("Nom d'utilisateur")).toBeInTheDocument();
      expect(screen.getByLabelText('Mot de passe')).toBeInTheDocument();
      expect(
        screen.getByLabelText('Confirmer le mot de passe'),
      ).toBeInTheDocument();
    });

    it('should render forgot password page correctly', () => {
      renderWithRouter(
        ['/forgot-password'],
        '/forgot-password',
        <ForgotPasswordPage />,
      );

      expect(screen.getByText('Mot de passe oublié')).toBeInTheDocument();
      expect(screen.getByLabelText('Email')).toBeInTheDocument();
      expect(
        screen.getByRole('button', {
          name: 'Envoyer le lien de réinitialisation',
        }),
      ).toBeInTheDocument();
    });

    it('should render reset password page correctly when token is present', async () => {
      renderWithRouter(
        ['/reset-password?token=test-token'],
        '/reset-password',
        <ResetPasswordPage />,
      );

      await waitFor(
        () => {
          expect(
            screen.getByLabelText('Nouveau mot de passe'),
          ).toBeInTheDocument();
        },
        { timeout: 3000 },
      );

      expect(
        screen.getByLabelText('Confirmer le mot de passe'),
      ).toBeInTheDocument();
    });

    it('should render reset password page error when token is missing', () => {
      renderWithRouter(
        ['/reset-password'],
        '/reset-password',
        <ResetPasswordPage />,
      );

      expect(
        screen.getByText('Lien de réinitialisation invalide'),
      ).toBeInTheDocument();
    });

    it('should render verify email page correctly when token is present', async () => {
      renderWithRouter(
        ['/verify-email?token=test-token'],
        '/verify-email',
        <VerifyEmailPage />,
      );

      await waitFor(
        () => {
          // VerifyEmailPage shows title "Vérification de l'email" initially, then changes
          expect(
            screen.getByText("Vérification de l'email").closest('h1') ||
            screen.getByText('Email vérifié').closest('h1'),
          ).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should render verify email page error when token is missing', () => {
      renderWithRouter(['/verify-email'], '/verify-email', <VerifyEmailPage />);

      expect(screen.getByText("Vérification de l'email")).toBeInTheDocument();
      expect(
        screen.getByText('Lien de vérification invalide ou manquant'),
      ).toBeInTheDocument();
    });
  });

  describe('Form validation integration', () => {
    it('should prevent form submission with invalid data', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/login'], '/login', <LoginPage />);

      const submitButton = screen.getByRole('button', { name: 'Sign In' });
      const emailInput = screen.getByLabelText('Email');

      // Try to submit without filling form
      await user.click(submitButton);

      // Form should still be visible (validation prevented submission)
      await waitFor(
        () => {
          expect(emailInput).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should prevent registration form submission with invalid data', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/register'], '/register', <RegisterPage />);

      const submitButton = screen.getByRole('button', { name: /s'inscrire/i });
      const emailInput = screen.getByLabelText('Email');

      // Try to submit without filling form
      await user.click(submitButton);

      // Form should still be visible (validation prevented submission)
      await waitFor(
        () => {
          expect(emailInput).toBeInTheDocument();
          expect(submitButton).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });
  });

  describe('Redirections', () => {
    it('should show login page for unauthenticated users', () => {
      renderWithRouter(['/login'], '/login', <LoginPage />);

      // Login form should be visible for unauthenticated users
      expect(screen.getByLabelText('Email')).toBeInTheDocument();
    });

    it('should show register page for unauthenticated users', () => {
      renderWithRouter(['/register'], '/register', <RegisterPage />);

      // Register form should be visible for unauthenticated users
      expect(screen.getByLabelText('Email')).toBeInTheDocument();
    });
  });

  describe('Password reset flow integration', () => {
    it('should render forgot password form and allow navigation', () => {
      renderWithRouter(
        ['/forgot-password'],
        '/forgot-password',
        <ForgotPasswordPage />,
      );

      expect(screen.getByText('Mot de passe oublié')).toBeInTheDocument();
      expect(screen.getByLabelText('Email')).toBeInTheDocument();

      // Check navigation link
      const loginLink = screen.getByText('Retour à la connexion');
      expect(loginLink).toBeInTheDocument();
      expect(loginLink.closest('a')).toHaveAttribute('href', '/login');
    });

    it('should render reset password form when token is provided', async () => {
      renderWithRouter(
        ['/reset-password?token=valid-token'],
        '/reset-password',
        <ResetPasswordPage />,
      );

      await waitFor(
        () => {
          expect(
            screen.getByLabelText('Nouveau mot de passe'),
          ).toBeInTheDocument();
        },
        { timeout: 3000 },
      );

      expect(
        screen.getByLabelText('Confirmer le mot de passe'),
      ).toBeInTheDocument();
    });
  });

  describe('Email verification flow integration', () => {
    it('should render verify email page with token', async () => {
      renderWithRouter(
        ['/verify-email?token=valid-token'],
        '/verify-email',
        <VerifyEmailPage />,
      );

      await waitFor(
        () => {
          // Initially shows "Vérification de l'email" while verifying
          const heading = document.querySelector('h1');
          expect(heading).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should show error when token is missing', () => {
      renderWithRouter(['/verify-email'], '/verify-email', <VerifyEmailPage />);

      expect(
        screen.getByText('Lien de vérification invalide ou manquant'),
      ).toBeInTheDocument();
    });
  });

  describe('Complete Authentication Flow', () => {
    it('should complete full login flow with form interaction', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/login'], '/login', <LoginPage />);

      const emailInput = screen.getByLabelText('Email');
      const passwordInput = screen.getByLabelText('Password');
      const submitButton = screen.getByRole('button', { name: 'Sign In' });

      await user.type(emailInput, 'test@example.com');
      await user.type(passwordInput, 'password123');

      expect(emailInput).toHaveValue('test@example.com');
      expect(passwordInput).toHaveValue('password123');
      expect(submitButton).toBeInTheDocument();
    });

    it('should complete full registration flow with form interaction', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/register'], '/register', <RegisterPage />);

      const emailInput = screen.getByLabelText('Email');
      const usernameInput = screen.getByLabelText("Nom d'utilisateur");
      const passwordInput = screen.getByLabelText('Mot de passe');
      const confirmPasswordInput = screen.getByLabelText(
        'Confirmer le mot de passe',
      );

      await user.type(emailInput, 'newuser@example.com');
      await user.type(usernameInput, 'newuser');
      await user.type(passwordInput, 'password123');
      await user.type(confirmPasswordInput, 'password123');

      expect(emailInput).toHaveValue('newuser@example.com');
      expect(usernameInput).toHaveValue('newuser');
      expect(passwordInput).toHaveValue('password123');
      expect(confirmPasswordInput).toHaveValue('password123');
    });

    it('should complete forgot password flow with form interaction', async () => {
      const user = userEvent.setup();

      renderWithRouter(
        ['/forgot-password'],
        '/forgot-password',
        <ForgotPasswordPage />,
      );

      const emailInput = screen.getByLabelText('Email');
      const submitButton = screen.getByRole('button', {
        name: 'Envoyer le lien de réinitialisation',
      });

      await user.type(emailInput, 'test@example.com');

      expect(emailInput).toHaveValue('test@example.com');
      expect(submitButton).toBeInTheDocument();
    });

    it('should complete reset password flow with form interaction', async () => {
      const user = userEvent.setup();

      renderWithRouter(
        ['/reset-password?token=valid-token'],
        '/reset-password',
        <ResetPasswordPage />,
      );

      await waitFor(
        () => {
          expect(
            screen.getByLabelText('Nouveau mot de passe'),
          ).toBeInTheDocument();
        },
        { timeout: 3000 },
      );

      const newPasswordInput = screen.getByLabelText('Nouveau mot de passe');
      const confirmPasswordInput = screen.getByLabelText(
        'Confirmer le mot de passe',
      );

      await user.type(newPasswordInput, 'newpassword123');
      await user.type(confirmPasswordInput, 'newpassword123');

      expect(newPasswordInput).toHaveValue('newpassword123');
      expect(confirmPasswordInput).toHaveValue('newpassword123');
    });

    it('should show validation errors on login form submission with empty fields', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/login'], '/login', <LoginPage />);

      const submitButton = screen.getByRole('button', { name: 'Sign In' });
      await user.click(submitButton);

      // Wait for validation errors
      await waitFor(
        () => {
          const emailInput = screen.getByLabelText('Email');
          expect(emailInput).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should show validation errors on registration form submission with empty fields', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/register'], '/register', <RegisterPage />);

      const submitButton = screen.getByRole('button', { name: /s'inscrire/i });
      await user.click(submitButton);

      // Wait for validation errors
      await waitFor(
        () => {
          expect(submitButton).toBeInTheDocument();
          const emailInput = screen.getByLabelText('Email');
          expect(emailInput).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should navigate through auth pages correctly', () => {
      // Test navigation from login to register
      renderWithRouter(['/login'], '/login', <LoginPage />);
      const registerLink = screen.getByText(/sign up/i);
      expect(registerLink).toBeInTheDocument();
      expect(registerLink.closest('a')).toHaveAttribute('href', '/register');
    });

    it('should navigate from register to login', () => {
      // Test navigation from register to login
      renderWithRouter(['/register'], '/register', <RegisterPage />);
      const loginLink = screen.getByText(/se connecter/i);
      expect(loginLink).toBeInTheDocument();
      expect(loginLink.closest('a')).toHaveAttribute('href', '/login');
    });

    it('should handle password mismatch validation in reset password flow', async () => {
      const user = userEvent.setup();

      renderWithRouter(
        ['/reset-password?token=valid-token'],
        '/reset-password',
        <ResetPasswordPage />,
      );

      await waitFor(
        () => {
          expect(
            screen.getByLabelText('Nouveau mot de passe'),
          ).toBeInTheDocument();
        },
        { timeout: 3000 },
      );

      const newPasswordInput = screen.getByLabelText('Nouveau mot de passe');
      const confirmPasswordInput = screen.getByLabelText(
        'Confirmer le mot de passe',
      );
      const submitButton = screen.getByRole('button', {
        name: /réinitialiser/i,
      });

      await user.type(newPasswordInput, 'password123');
      await user.type(confirmPasswordInput, 'differentpassword');

      // Form should show validation error on submit
      await user.click(submitButton);

      // Wait for any validation error to appear
      await waitFor(
        () => {
          expect(newPasswordInput).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });

    it('should handle remember me checkbox interaction', async () => {
      const user = userEvent.setup();

      renderWithRouter(['/login'], '/login', <LoginPage />);

      const emailInput = screen.getByLabelText('Email');

      // LoginPage uses English "Remember me"
      const rememberMeCheckbox =
        screen.queryByLabelText(/remember/i) ||
        screen.queryByRole('checkbox', { name: /remember/i });

      await user.type(emailInput, 'remember@example.com');

      if (rememberMeCheckbox) {
        await user.click(rememberMeCheckbox);
      }

      expect(emailInput).toHaveValue('remember@example.com');
    });

    it('should complete email verification flow', async () => {
      renderWithRouter(
        ['/verify-email?token=valid-token'],
        '/verify-email',
        <VerifyEmailPage />,
      );

      await waitFor(
        () => {
          const heading = document.querySelector('h1');
          expect(heading).toBeInTheDocument();
        },
        { timeout: 2000 },
      );
    });
  });
});