/**
 * Main App Component - Integrated with Real API
 */

import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { HashRouter as Router, Routes, Route, Navigate } from 'react-router-dom';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import { useCurrentUser, useMasquerade, useLogout } from './hooks/useAuth';
import { useCurrentBusiness } from './hooks/useBusiness';
import { useUpdateBusiness } from './hooks/useBusiness';
import { setCookie } from './utils/cookies';

// Import Login Page
import LoginPage from './pages/LoginPage';
import OAuthCallback from './pages/OAuthCallback';

// Import layouts
import BusinessLayout from './layouts/BusinessLayout';
import PlatformLayout from './layouts/PlatformLayout';
import CustomerLayout from './layouts/CustomerLayout';
import MarketingLayout from './layouts/MarketingLayout';

// Import marketing pages
import HomePage from './pages/marketing/HomePage';
import FeaturesPage from './pages/marketing/FeaturesPage';
import PricingPage from './pages/marketing/PricingPage';
import AboutPage from './pages/marketing/AboutPage';
import ContactPage from './pages/marketing/ContactPage';
import SignupPage from './pages/marketing/SignupPage';

// Import pages
import Dashboard from './pages/Dashboard';
import Scheduler from './pages/Scheduler';
import Customers from './pages/Customers';
import Settings from './pages/Settings';
import Payments from './pages/Payments';
import Resources from './pages/Resources';
import Services from './pages/Services';
import Staff from './pages/Staff';
import CustomerDashboard from './pages/customer/CustomerDashboard';
import ResourceDashboard from './pages/resource/ResourceDashboard';
import BookingPage from './pages/customer/BookingPage';
import TrialExpired from './pages/TrialExpired';
import Upgrade from './pages/Upgrade';

// Import platform pages
import PlatformDashboard from './pages/platform/PlatformDashboard';
import PlatformBusinesses from './pages/platform/PlatformBusinesses';
import PlatformSupport from './pages/platform/PlatformSupport';
import PlatformUsers from './pages/platform/PlatformUsers';
import PlatformSettings from './pages/platform/PlatformSettings';
import ProfileSettings from './pages/ProfileSettings';
import VerifyEmail from './pages/VerifyEmail';
import EmailVerificationRequired from './pages/EmailVerificationRequired';
import AcceptInvitePage from './pages/AcceptInvitePage';
import TenantOnboardPage from './pages/TenantOnboardPage';

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      refetchOnWindowFocus: false,
      retry: 1,
      staleTime: 30000, // 30 seconds
    },
  },
});

/**
 * Loading Component
 */
const LoadingScreen: React.FC = () => {
  const { t } = useTranslation();
  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 dark:bg-gray-900">
      <div className="text-center">
        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto mb-4"></div>
        <p className="text-gray-600 dark:text-gray-400">{t('common.loading')}</p>
      </div>
    </div>
  );
};

/**
 * Error Component
 */
const ErrorScreen: React.FC<{ error: Error }> = ({ error }) => {
  const { t } = useTranslation();
  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 dark:bg-gray-900">
      <div className="text-center max-w-md">
        <h2 className="text-2xl font-bold text-red-600 dark:text-red-400 mb-4">{t('common.error')}</h2>
        <p className="text-gray-600 dark:text-gray-400 mb-4">{error.message}</p>
        <button
          onClick={() => window.location.reload()}
          className="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700"
        >
          {t('common.reload')}
        </button>
      </div>
    </div>
  );
};

/**
 * App Content - Handles routing based on auth state
 */
const AppContent: React.FC = () => {
  // Check for tokens in URL FIRST - before any queries execute
  // This handles login/masquerade redirects that pass tokens in the URL
  const [processingUrlTokens] = useState(() => {
    const params = new URLSearchParams(window.location.search);
    return !!(params.get('access_token') && params.get('refresh_token'));
  });

  const { data: user, isLoading: userLoading, error: userError } = useCurrentUser();
  const { data: business, isLoading: businessLoading, error: businessError } = useCurrentBusiness();
  const [darkMode, setDarkMode] = useState(false);
  const updateBusinessMutation = useUpdateBusiness();
  const masqueradeMutation = useMasquerade();
  const logoutMutation = useLogout();

  // Apply dark mode class
  React.useEffect(() => {
    document.documentElement.classList.toggle('dark', darkMode);
  }, [darkMode]);

  // Handle tokens in URL (from login or masquerade redirect)
  React.useEffect(() => {
    const params = new URLSearchParams(window.location.search);
    const accessToken = params.get('access_token');
    const refreshToken = params.get('refresh_token');

    if (accessToken && refreshToken) {
      // Extract masquerade stack if present (for masquerade banner)
      const masqueradeStackParam = params.get('masquerade_stack');
      if (masqueradeStackParam) {
        try {
          const masqueradeStack = JSON.parse(decodeURIComponent(masqueradeStackParam));
          localStorage.setItem('masquerade_stack', JSON.stringify(masqueradeStack));
        } catch (e) {
          console.error('Failed to parse masquerade stack', e);
        }
      }

      // For backward compatibility, also check for original_user parameter
      const originalUserParam = params.get('original_user');
      if (originalUserParam && !masqueradeStackParam) {
        try {
          const originalUser = JSON.parse(decodeURIComponent(originalUserParam));
          // Convert old format to new stack format (single entry)
          const stack = [{
            user_id: originalUser.id,
            username: originalUser.username,
            role: originalUser.role,
            business_id: originalUser.business,
            business_subdomain: originalUser.business_subdomain,
          }];
          localStorage.setItem('masquerade_stack', JSON.stringify(stack));
        } catch (e) {
          console.error('Failed to parse original user', e);
        }
      }

      // Set cookies using helper (handles domain correctly)
      setCookie('access_token', accessToken, 7);
      setCookie('refresh_token', refreshToken, 7);

      // Clear session cookie to prevent interference with JWT
      // (Django session cookie might take precedence over JWT)
      document.cookie = 'sessionid=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/; domain=.lvh.me';
      document.cookie = 'sessionid=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;';

      // Clean URL
      const newUrl = window.location.pathname + window.location.hash;
      window.history.replaceState({}, '', newUrl);

      // Force reload to ensure auth state is picked up
      window.location.reload();
    }
  }, []);

  // Show loading while processing URL tokens (before reload happens)
  if (processingUrlTokens) {
    return <LoadingScreen />;
  }

  // Loading state
  if (userLoading) {
    return <LoadingScreen />;
  }

  // Helper to detect root domain (for marketing site)
  const isRootDomain = (): boolean => {
    const hostname = window.location.hostname;
    return hostname === 'lvh.me' || hostname === 'localhost' || hostname === '127.0.0.1';
  };

  // On root domain, ALWAYS show marketing site (even if logged in)
  // Logged-in users will see a "Go to Dashboard" link in the navbar
  if (isRootDomain()) {
    return (
      <Routes>
        <Route element={<MarketingLayout user={user} />}>
          <Route path="/" element={<HomePage />} />
          <Route path="/features" element={<FeaturesPage />} />
          <Route path="/pricing" element={<PricingPage />} />
          <Route path="/about" element={<AboutPage />} />
          <Route path="/contact" element={<ContactPage />} />
          <Route path="/signup" element={<SignupPage />} />
        </Route>
        <Route path="/login" element={<LoginPage />} />
        <Route path="/oauth/callback/:provider" element={<OAuthCallback />} />
        <Route path="/verify-email" element={<VerifyEmail />} />
        <Route path="/accept-invite" element={<AcceptInvitePage />} />
        <Route path="/tenant-onboard" element={<TenantOnboardPage />} />
        <Route path="*" element={<Navigate to="/" replace />} />
      </Routes>
    );
  }

  // Not authenticated on subdomain - show login
  if (!user) {
    return (
      <Routes>
        <Route path="/login" element={<LoginPage />} />
        <Route path="/oauth/callback/:provider" element={<OAuthCallback />} />
        <Route path="/verify-email" element={<VerifyEmail />} />
        <Route path="/accept-invite" element={<AcceptInvitePage />} />
        <Route path="/tenant-onboard" element={<TenantOnboardPage />} />
        <Route path="*" element={<Navigate to="/login" replace />} />
      </Routes>
    );
  }

  // Error state
  if (userError) {
    return <ErrorScreen error={userError as Error} />;
  }

  // Subdomain validation for logged-in users
  const currentHostname = window.location.hostname;
  const isPlatformDomain = currentHostname === 'platform.lvh.me';
  const currentSubdomain = currentHostname.split('.')[0];
  const isBusinessSubdomain = !isRootDomain() && !isPlatformDomain && currentSubdomain !== 'api';

  const isPlatformUser = ['superuser', 'platform_manager', 'platform_support'].includes(user.role);
  const isBusinessUser = ['owner', 'manager', 'staff', 'resource'].includes(user.role);
  const isCustomer = user.role === 'customer';

  // RULE: Platform users must be on platform subdomain (not business subdomains)
  if (isPlatformUser && isBusinessSubdomain) {
    const port = window.location.port ? `:${window.location.port}` : '';
    window.location.href = `http://platform.lvh.me${port}/`;
    return <LoadingScreen />;
  }

  // RULE: Business users must be on their own business subdomain
  if (isBusinessUser && isBusinessSubdomain && user.business_subdomain && user.business_subdomain !== currentSubdomain) {
    const port = window.location.port ? `:${window.location.port}` : '';
    window.location.href = `http://${user.business_subdomain}.lvh.me${port}/`;
    return <LoadingScreen />;
  }

  // RULE: Customers must be on their business subdomain
  if (isCustomer && isPlatformDomain && user.business_subdomain) {
    const port = window.location.port ? `:${window.location.port}` : '';
    window.location.href = `http://${user.business_subdomain}.lvh.me${port}/`;
    return <LoadingScreen />;
  }

  if (isCustomer && isBusinessSubdomain && user.business_subdomain && user.business_subdomain !== currentSubdomain) {
    const port = window.location.port ? `:${window.location.port}` : '';
    window.location.href = `http://${user.business_subdomain}.lvh.me${port}/`;
    return <LoadingScreen />;
  }

  // Handlers
  const toggleTheme = () => setDarkMode((prev) => !prev);
  const handleSignOut = () => {
    logoutMutation.mutate();
  };
  const handleUpdateBusiness = (updates: Partial<any>) => {
    updateBusinessMutation.mutate(updates);
  };

  const handleMasquerade = (targetUser: any) => {
    // Call the masquerade API with the target user's id
    const userId = targetUser.id;
    if (!userId) {
      console.error('Cannot masquerade: no user id available', targetUser);
      return;
    }
    // Ensure userId is a number
    const userPk = typeof userId === 'string' ? parseInt(userId, 10) : userId;
    masqueradeMutation.mutate(userPk);
  };

  // Helper to check access based on roles
  const hasAccess = (allowedRoles: string[]) => allowedRoles.includes(user.role);

  if (isPlatformUser) {
    return (
      <Routes>
        <Route
          element={
            <PlatformLayout
              user={user}
              darkMode={darkMode}
              toggleTheme={toggleTheme}
              onSignOut={handleSignOut}
            />
          }
        >
          {(user.role === 'superuser' || user.role === 'platform_manager') && (
            <>
              <Route path="/platform/dashboard" element={<PlatformDashboard />} />
              <Route path="/platform/businesses" element={<PlatformBusinesses onMasquerade={handleMasquerade} />} />
              <Route path="/platform/users" element={<PlatformUsers onMasquerade={handleMasquerade} />} />
            </>
          )}
          <Route path="/platform/support" element={<PlatformSupport />} />
          {user.role === 'superuser' && (
            <Route path="/platform/settings" element={<PlatformSettings />} />
          )}
          <Route path="/platform/profile" element={<ProfileSettings />} />
          <Route path="/verify-email" element={<VerifyEmail />} />
          <Route
            path="*"
            element={
              <Navigate
                to={
                  user.role === 'superuser' || user.role === 'platform_manager'
                    ? '/platform/dashboard'
                    : '/platform/support'
                }
              />
            }
          />
        </Route>
      </Routes>
    );
  }

  // Customer users
  if (user.role === 'customer') {
    return (
      <Routes>
        <Route
          element={
            <CustomerLayout
              business={business || ({} as any)}
              user={user}
            />
          }
        >
          <Route path="/" element={<CustomerDashboard />} />
          <Route path="/book" element={<BookingPage />} />
          <Route path="/payments" element={<Payments />} />
          <Route path="/profile" element={<ProfileSettings />} />
          <Route path="/verify-email" element={<VerifyEmail />} />
          <Route path="*" element={<Navigate to="/" />} />
        </Route>
      </Routes>
    );
  }

  // Business loading - show loading with user info
  if (businessLoading) {
    return <LoadingScreen />;
  }

  // Business error or no business found
  if (businessError || !business) {
    // If user has a business subdomain, redirect them there
    if (user.business_subdomain) {
      const port = window.location.port ? `:${window.location.port}` : '';
      window.location.href = `http://${user.business_subdomain}.lvh.me${port}/`;
      return <LoadingScreen />;
    }

    // No business subdomain - show error
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-50 dark:bg-gray-900">
        <div className="text-center max-w-md p-6">
          <h2 className="text-2xl font-bold text-red-600 dark:text-red-400 mb-4">Business Not Found</h2>
          <p className="text-gray-600 dark:text-gray-400 mb-4">
            {businessError instanceof Error ? businessError.message : 'Unable to load business data. Please check your subdomain or try again.'}
          </p>
          <div className="flex gap-4 justify-center">
            <button
              onClick={() => window.location.reload()}
              className="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700"
            >
              Reload
            </button>
            <button
              onClick={handleSignOut}
              className="px-4 py-2 bg-gray-600 text-white rounded hover:bg-gray-700"
            >
              Sign Out
            </button>
          </div>
        </div>
      </div>
    );
  }

  // Business users (owner, manager, staff, resource)
  if (['owner', 'manager', 'staff', 'resource'].includes(user.role)) {
    // Check if email verification is required
    if (!user.email_verified) {
      return (
        <Routes>
          <Route path="/email-verification-required" element={<EmailVerificationRequired />} />
          <Route path="/verify-email" element={<VerifyEmail />} />
          <Route path="*" element={<Navigate to="/email-verification-required" replace />} />
        </Routes>
      );
    }

    // Check if trial has expired
    const isTrialExpired = business.isTrialExpired || (business.status === 'Trial' && business.trialEnd && new Date(business.trialEnd) < new Date());

    // Allowed routes when trial is expired
    const allowedWhenExpired = ['/trial-expired', '/upgrade', '/settings', '/profile'];
    const currentPath = window.location.pathname;
    const isOnAllowedRoute = allowedWhenExpired.some(route => currentPath.startsWith(route));

    // If trial expired and not on allowed route, redirect to trial-expired
    if (isTrialExpired && !isOnAllowedRoute) {
      return (
        <Routes>
          <Route path="/trial-expired" element={<TrialExpired />} />
          <Route path="/upgrade" element={<Upgrade />} />
          <Route path="/profile" element={<ProfileSettings />} />
          <Route
            path="/settings"
            element={hasAccess(['owner']) ? <Settings /> : <Navigate to="/trial-expired" />}
          />
          <Route path="*" element={<Navigate to="/trial-expired" replace />} />
        </Routes>
      );
    }

    return (
      <Routes>
        <Route
          element={
            <BusinessLayout
              business={business}
              user={user}
              darkMode={darkMode}
              toggleTheme={toggleTheme}
              onSignOut={handleSignOut}
              updateBusiness={handleUpdateBusiness}
            />
          }
        >
          {/* Trial and Upgrade Routes */}
          <Route path="/trial-expired" element={<TrialExpired />} />
          <Route path="/upgrade" element={<Upgrade />} />

          {/* Regular Routes */}
          <Route
            path="/"
            element={user.role === 'resource' ? <ResourceDashboard /> : <Dashboard />}
          />
          <Route path="/scheduler" element={<Scheduler />} />
          <Route
            path="/customers"
            element={
              hasAccess(['owner', 'manager', 'staff']) ? (
                <Customers onMasquerade={handleMasquerade} effectiveUser={user} />
              ) : (
                <Navigate to="/" />
              )
            }
          />
          <Route
            path="/services"
            element={
              hasAccess(['owner', 'manager', 'staff']) ? (
                <Services />
              ) : (
                <Navigate to="/" />
              )
            }
          />
          <Route
            path="/resources"
            element={
              hasAccess(['owner', 'manager', 'staff']) ? (
                <Resources onMasquerade={handleMasquerade} effectiveUser={user} />
              ) : (
                <Navigate to="/" />
              )
            }
          />
          <Route
            path="/staff"
            element={
              hasAccess(['owner', 'manager']) ? (
                <Staff onMasquerade={handleMasquerade} effectiveUser={user} />
              ) : (
                <Navigate to="/" />
              )
            }
          />
          <Route
            path="/payments"
            element={
              hasAccess(['owner', 'manager']) ? <Payments /> : <Navigate to="/" />
            }
          />
          <Route
            path="/messages"
            element={
              hasAccess(['owner', 'manager']) ? (
                <div className="p-8">
                  <h1 className="text-2xl font-bold mb-4">Messages</h1>
                  <p className="text-gray-600">Messages feature coming soon...</p>
                </div>
              ) : (
                <Navigate to="/" />
              )
            }
          />
          <Route
            path="/settings"
            element={hasAccess(['owner']) ? <Settings /> : <Navigate to="/" />}
          />
          <Route path="/profile" element={<ProfileSettings />} />
          <Route path="/verify-email" element={<VerifyEmail />} />
          <Route path="*" element={<Navigate to="/" />} />
        </Route>
      </Routes>
    );
  }

  // Fallback
  return <Navigate to="/" />;
};

/**
 * Main App Component
 */
const App: React.FC = () => {
  return (
    <QueryClientProvider client={queryClient}>
      <Router>
        <AppContent />
      </Router>
    </QueryClientProvider>
  );
};

export default App;