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

import AuthPage from "./pages/AuthPage";
import HomePage from "./pages/Home";
import DocumentsPage from "./pages/Documents";
import IngredientSearchPage from "./pages/IngredientSearchPage";
import RecentUpdatesPage from "./pages/RecentUpdatesPage";
import AboutPage from "./pages/AboutPage";
import ContactPage from "./pages/ContactPage";
import CGU from "./pages/CGU";
import MentionsLegales from "./pages/MentionsLegales";
import Admin from "./pages/Admin";
import AdminRoute from "./components/AdminRoute";

import Sidebar from "./components/Sidebar";
import Footer from "./components/Footer";
import CookieBanner from "./components/CookieBanner";
import Toasts from "./components/Toast";
import BackToTop from "./components/BackToTop";

import styles from "./App.module.css";

import { getDocuments, API_URL, type ApiDocument } from "./services/theapi";

type NavItem =
  | "home"
  | "ingredient-search"
  | "documents"
  | "recent-updates"
  | "about"
  | "contact"
  | "cgu"
  | "mentions-legales"
  | "admin";

interface User {
  id: number;
  email: string;
  full_name: string | null;
}

interface AuthState {
  user: User | null;
  isAuthenticated: boolean;
  loading: boolean;
}

export default function App() {
  const [recentDocuments, setRecentDocuments] = useState<ApiDocument[]>([]);
  const [authState, setAuthState] = useState<AuthState>(() => {
    const savedToken = localStorage.getItem("authToken");
    const savedUser = localStorage.getItem("user");

    if (savedToken && savedUser) {
      const parsedUser = JSON.parse(savedUser);
      return {
        user: parsedUser,
        isAuthenticated: true,
        loading: false,
      };
    }
    
    return {
      user: null,
      isAuthenticated: false,
      loading: false,
    };
  });

  const location = useLocation();
  const navigate = useNavigate();

  const handleAuthSuccess = (newToken: string, newUser: User) => {
    localStorage.setItem("authToken", newToken);
    localStorage.setItem("user", JSON.stringify(newUser));
    setAuthState({
      user: newUser,
      isAuthenticated: true,
      loading: false,
    });
    navigate("/");
  };

  const handleLogout = () => {
    localStorage.removeItem("authToken");
    localStorage.removeItem("user");
    setAuthState({
      user: null,
      isAuthenticated: false,
      loading: false,
    });
    navigate("/");
  };

  const activeNav: NavItem =
    location.pathname === "/ingredient-search" ? "ingredient-search"
    : location.pathname === "/documents"       ? "documents"
    : location.pathname === "/recent-updates"  ? "recent-updates"
    : location.pathname === "/about"           ? "about"
    : location.pathname === "/contact"         ? "contact"
    : location.pathname === "/cgu"             ? "cgu"
    : location.pathname === "/mentions-legales"? "mentions-legales"
    : location.pathname === "/admin"? "admin"
    : "home";


  useEffect(() => {
    const token = localStorage.getItem("authToken");
    if (!token) return;

    fetch(`${API_URL}/me?token=${encodeURIComponent(token)}`)
      .then((res) => (res.ok ? res.json() : Promise.reject(res.status)))
      .then((freshUser: User) => {
        localStorage.setItem("user", JSON.stringify(freshUser));
        setAuthState((prev) => ({ ...prev, user: freshUser }));
      })
      .catch((err) => console.error("Rafraîchissement du profil impossible :", err));
  }, []);

  useEffect(() => {
    if (authState.isAuthenticated) {
      getDocuments()
        .then((data) => {
          setRecentDocuments(Array.isArray(data) ? data.slice(0, 4) : []);
        })
        .catch((err) => {
          console.error("API ERROR:", err);
          setRecentDocuments([]);
        });
    }
  }, [authState.isAuthenticated]);

  const handleNavClick = (item: NavItem) => {
    const path =
      item === "home"                ? "/"
      : item === "documents"         ? "/documents"
      : item === "ingredient-search" ? "/ingredient-search"
      : item === "recent-updates"    ? "/recent-updates"
      : item === "about"             ? "/about"
      : item === "contact"           ? "/contact"
      : item === "cgu"               ? "/cgu"
      : item === 'admin'             ? '/admin'
      : "/mentions-legales";
    navigate(path);
  };

  if (authState.loading) {
    return (
      <div style={{ minHeight: "100vh", display: "flex", alignItems: "center", justifyContent: "center", backgroundColor: "#f8fafc" }}>
        <p style={{ color: "#475569", fontSize: "1.125rem" }}>Loading application...</p>
      </div>
    );
  }


  if (!authState.isAuthenticated) {
    return (
      <>
        <AuthPage onAuthSuccess={handleAuthSuccess} />
        <CookieBanner />
      </>
    );
  }

  return (
    <div className={styles.app}>
      <Toasts />
      <div className={styles.contentWrapper}>
        <Sidebar
          activeNav={activeNav}
          onNavClick={handleNavClick}
          onLogout={handleLogout}
          user={authState.user}
        />
        <main className={styles.main}>
          <Routes>
            <Route path="/" element={<HomePage handleNavClick={handleNavClick} recentDocuments={recentDocuments} />} />
            <Route path="/documents" element={<DocumentsPage />} />
            <Route path="/ingredient-search" element={<IngredientSearchPage />} />
            <Route path="/recent-updates" element={<RecentUpdatesPage />} />
            <Route path="/about" element={<AboutPage />} />
            <Route path="/contact" element={<ContactPage />} />
            <Route path="/cgu" element={<CGU />} />
            <Route path="/mentions-legales" element={<MentionsLegales />} />
              <Route path="/admin" element={<AdminRoute user={authState.user}><Admin /></AdminRoute>} />
            <Route path="*" element={<Navigate to="/" />} />
          </Routes>
        </main>
      </div>
      <Footer onNavClick={handleNavClick} />
      <CookieBanner />
        <BackToTop />
    </div>
  );
}