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import { useEffect, useState } from 'react';
import { BrowserRouter, Routes, Route, Navigate, useNavigate, useLocation } from 'react-router-dom';
import { MainApp } from './pages/MainApp';
import { Login } from './pages/Login';
import { Settings } from './pages/Settings';
import { isAuthenticated, getCurrentUser, setAuthTokenFromHash } from './services/auth';
import './App.css';

// Protected route wrapper with auth check
function ProtectedRoute({ children }: { children: React.ReactNode }) {
  const navigate = useNavigate();
  const location = useLocation();
  const [isChecking, setIsChecking] = useState(true);
  const [hasToken, setHasToken] = useState<boolean>(isAuthenticated());

  // T110: Check if user is authenticated on mount
  useEffect(() => {
    const checkAuth = async () => {
      // Check for OAuth callback token in URL hash
      const tokenExtracted = setAuthTokenFromHash();
      if (tokenExtracted) {
        console.log('OAuth token extracted from URL hash');
        setHasToken(true);
        setIsChecking(false);
        return;
      }

      if (!isAuthenticated()) {
        setHasToken(false);
        setIsChecking(false);
        return;
      }

      setHasToken(true);

      const token = localStorage.getItem('auth_token');
      // Skip validation for local dev token
      if (token === 'local-dev-token') {
        setIsChecking(false);
        return;
      }

      try {
        // Verify the token is valid by calling getCurrentUser
        await getCurrentUser();
        setIsChecking(false);
      } catch (err) {
        // Token is invalid (401), redirect to login
        console.warn('Authentication failed, redirecting to login');
        localStorage.removeItem('auth_token');
        setHasToken(false);
        setIsChecking(false);
        if (location.pathname !== '/login') {
          navigate('/login', { replace: true, state: { from: location } });
        }
      }
    };

    checkAuth();
  }, [navigate, location]);

  if (isChecking) {
    return (
      <div className="h-screen flex items-center justify-center bg-background">
        <div className="text-muted-foreground">Loading...</div>
      </div>
    );
  }

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

  return <>{children}</>;
}

function App() {
  return (
    <BrowserRouter>
      <Routes>
        <Route path="/login" element={<Login />} />
        <Route
          path="/"
          element={
            <ProtectedRoute>
              <MainApp />
            </ProtectedRoute>
          }
        />
        <Route
          path="/settings"
          element={
            <ProtectedRoute>
              <Settings />
            </ProtectedRoute>
          }
        />
      </Routes>
    </BrowserRouter>
  );
}

export default App;