import { useEffect, useState, type ReactNode } from "react";
import {
  Navigate,
  Route,
  Routes,
  useLocation,
  useParams,
} from "react-router-dom";

import { AppShell } from "@/components/AppShell";
import { FullPageSpinner } from "@/components/ui";
import AccountPage from "@/features/account/AccountPage";
import { AgeGate } from "@/features/age/AgeGate";
import LoginPage from "@/features/auth/LoginPage";
import RegisterPage from "@/features/auth/RegisterPage";
import DetailPage from "@/features/detail/DetailPage";
import DeletePage from "@/features/library/DeletePage";
import DuplicatesPage from "@/features/library/DuplicatesPage";
import FollowedPage from "@/features/follows/FollowedPage";
import LibraryPage from "@/features/library/LibraryPage";
import Md5Redirect from "@/features/library/Md5Redirect";
import OnlinePage from "@/features/online/OnlinePage";
import PoolDetailPage from "@/features/pools/PoolDetailPage";
import PoolsPage from "@/features/pools/PoolsPage";
import SimilarPage from "@/features/similar/SimilarPage";
import UploadPage from "@/features/upload/UploadPage";
import UsersPage from "@/features/users/UsersPage";
import { isAgeVerified, markAgeVerified } from "@/lib/age";
import { useAuth } from "@/store/auth";

function RequireAuth({ children }: { children: ReactNode }) {
  const user = useAuth((state) => state.user);
  const location = useLocation();
  if (!user) {
    return <Navigate to="/login" state={{ from: location.pathname }} replace />;
  }
  return <>{children}</>;
}

function PostRedirect() {
  const { postId = "" } = useParams();
  return <Navigate to={`/detail/${postId}`} replace />;
}

export default function App() {
  const ready = useAuth((state) => state.ready);
  const loadUser = useAuth((state) => state.loadUser);
  const [ageVerified, setAgeVerified] = useState(isAgeVerified);

  useEffect(() => {
    void loadUser();
  }, [loadUser]);

  if (!ageVerified) {
    return (
      <AgeGate
        onEnter={() => {
          markAgeVerified();
          setAgeVerified(true);
        }}
      />
    );
  }

  if (!ready) {
    return <FullPageSpinner />;
  }

  return (
    <Routes>
      <Route element={<AppShell />}>
        <Route path="/" element={<LibraryPage />} />
        <Route path="/detail/:itemId" element={<DetailPage />} />
        <Route path="/view/:md5" element={<Md5Redirect />} />
        <Route path="/online" element={<OnlinePage />} />
        <Route path="/online/view/:postId" element={<PostRedirect />} />
        <Route path="/pools" element={<PoolsPage />} />
        <Route path="/pools/:poolId" element={<PoolDetailPage />} />
        <Route
          path="/followed"
          element={
            <RequireAuth>
              <FollowedPage />
            </RequireAuth>
          }
        />
        <Route
          path="/duplicates"
          element={
            <RequireAuth>
              <DuplicatesPage />
            </RequireAuth>
          }
        />
        <Route
          path="/delete"
          element={
            <RequireAuth>
              <DeletePage />
            </RequireAuth>
          }
        />
        <Route
          path="/users"
          element={
            <RequireAuth>
              <UsersPage />
            </RequireAuth>
          }
        />
        <Route
          path="/similar"
          element={
            <RequireAuth>
              <SimilarPage />
            </RequireAuth>
          }
        />
        <Route
          path="/upload"
          element={
            <RequireAuth>
              <UploadPage />
            </RequireAuth>
          }
        />
        <Route
          path="/account"
          element={
            <RequireAuth>
              <AccountPage />
            </RequireAuth>
          }
        />
        <Route path="*" element={<Navigate to="/" replace />} />
      </Route>
      <Route path="/login" element={<LoginPage />} />
      <Route path="/register" element={<RegisterPage />} />
    </Routes>
  );
}