import { useEffect } from 'react';
import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
import { AuthProvider, useAuth } from './context/AuthContext';
import Login from './pages/Login';
import Register from './pages/Register';
import Dashboard from './pages/Dashboard';
import ProductDetail from './pages/ProductDetail';
import Settings from './pages/Settings';

function ThemeInitializer({ children }: { children: React.ReactNode }) {
  useEffect(() => {
    const saved = localStorage.getItem('theme');
    if (saved) {
      document.documentElement.setAttribute('data-theme', saved);
    }
  }, []);
  return <>{children}</>;
}

function ProtectedRoute({ children }: { children: React.ReactNode }) {
  const { user, isLoading } = useAuth();

  if (isLoading) {
    return (
      <div
        style={{
          display: 'flex',
          justifyContent: 'center',
          alignItems: 'center',
          height: '100vh',
        }}
      >
        <span className="spinner" style={{ width: '3rem', height: '3rem' }} />
      </div>
    );
  }

  if (!user) {
    return <Navigate to="/login" replace />;
  }

  return <>{children}</>;
}

function PublicRoute({ children }: { children: React.ReactNode }) {
  const { user, isLoading } = useAuth();

  if (isLoading) {
    return (
      <div
        style={{
          display: 'flex',
          justifyContent: 'center',
          alignItems: 'center',
          height: '100vh',
        }}
      >
        <span className="spinner" style={{ width: '3rem', height: '3rem' }} />
      </div>
    );
  }

  if (user) {
    return <Navigate to="/" replace />;
  }

  return <>{children}</>;
}

function AppRoutes() {
  return (
    <Routes>
      <Route
        path="/login"
        element={
          <PublicRoute>
            <Login />
          </PublicRoute>
        }
      />
      <Route
        path="/register"
        element={
          <PublicRoute>
            <Register />
          </PublicRoute>
        }
      />
      <Route
        path="/"
        element={
          <ProtectedRoute>
            <Dashboard />
          </ProtectedRoute>
        }
      />
      <Route
        path="/product/:id"
        element={
          <ProtectedRoute>
            <ProductDetail />
          </ProtectedRoute>
        }
      />
      <Route
        path="/settings"
        element={
          <ProtectedRoute>
            <Settings />
          </ProtectedRoute>
        }
      />
      <Route path="*" element={<Navigate to="/" replace />} />
    </Routes>
  );
}

export default function App() {
  return (
    <ThemeInitializer>
      <BrowserRouter>
        <AuthProvider>
          <AppRoutes />
        </AuthProvider>
      </BrowserRouter>
    </ThemeInitializer>
  );
}