import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../auth/auth_provider.dart';
import '../../features/auth/presentation/login_screen.dart';
import '../../features/auth/presentation/register_screen.dart';
import '../../features/auth/presentation/splash_screen.dart';
import '../../features/home/presentation/home_screen.dart';
import '../../features/establishments/presentation/establishment_detail_screen.dart';
import '../../features/wallet/presentation/wallet_screen.dart';
import '../../features/wallet/presentation/wallet_top_up_screen.dart';
import '../../features/booking/presentation/booking_modify_screen.dart';
import '../../features/booking/presentation/bookings_screen.dart';
import '../../features/machines/presentation/machine_action_screen.dart';
import '../../features/machines/presentation/machine_booking_screen.dart';
import '../../features/wash/presentation/qr_scanner_screen.dart';
import '../../features/wash/presentation/wash_screen.dart';
import '../../features/profile/presentation/profile_screen.dart';
import '../widgets/main_shell.dart';

/// Routes nommées de l'application.
abstract final class AppRoutes {
  static const splash = '/splash';
  static const login = '/login';
  static const register = '/register';
  static const home = '/';
  static const wallet = '/wallet';
  static const walletTopUp = '/wallet/top-up';
  static const bookings = '/bookings';
  static const washes = '/washes';
  static const washScan = '/washes/scan';
  static const profile = '/profile';
  static const establishment = '/establishments/:uuid';
  static String machineAction(String uuid) => '/machines/$uuid/action';
  static String machineBooking(String uuid) => '/machines/$uuid/book';
  static String bookingModify(String uuid) => '/bookings/$uuid/edit';
}

/// Configuration GoRouter avec redirection selon l'état d'authentification.
final appRouterProvider = Provider<GoRouter>((ref) {
  final authState = ref.watch(authProvider);

  return GoRouter(
    initialLocation: AppRoutes.splash,
    refreshListenable: GoRouterRefreshStream(ref),
    redirect: (context, state) {
      final location = state.matchedLocation;
      final onSplash = location == AppRoutes.splash;
      final isAuthRoute = location == AppRoutes.login || location == AppRoutes.register;

      // Restauration de session en cours → écran de chargement.
      if (authState.isLoading) {
        return onSplash ? null : AppRoutes.splash;
      }

      // Session restaurée → quitter le splash.
      if (onSplash) {
        return authState.isAuthenticated ? AppRoutes.home : AppRoutes.login;
      }

      final isAuthenticated = authState.isAuthenticated;

      if (!isAuthenticated && !isAuthRoute) {
        return AppRoutes.login;
      }

      if (isAuthenticated && isAuthRoute) {
        return AppRoutes.home;
      }

      return null;
    },
    routes: [
      GoRoute(
        path: AppRoutes.splash,
        builder: (context, state) => const SplashScreen(),
      ),
      GoRoute(
        path: AppRoutes.login,
        builder: (context, state) => const LoginScreen(),
      ),
      GoRoute(
        path: AppRoutes.register,
        builder: (context, state) => const RegisterScreen(),
      ),
      ShellRoute(
        builder: (context, state, child) => MainShell(child: child),
        routes: [
          GoRoute(
            path: AppRoutes.home,
            builder: (context, state) => const HomeScreen(),
          ),
          GoRoute(
            path: AppRoutes.bookings,
            builder: (context, state) => const BookingsScreen(),
          ),
          GoRoute(
            path: AppRoutes.washes,
            builder: (context, state) => const WashScreen(),
          ),
          GoRoute(
            path: AppRoutes.wallet,
            builder: (context, state) => const WalletScreen(),
          ),
          GoRoute(
            path: AppRoutes.profile,
            builder: (context, state) => const ProfileScreen(),
          ),
        ],
      ),
      GoRoute(
        path: AppRoutes.establishment,
        builder: (context, state) {
          final uuid = state.pathParameters['uuid']!;
          return EstablishmentDetailScreen(establishmentUuid: uuid);
        },
      ),
      GoRoute(
        path: AppRoutes.washScan,
        builder: (context, state) => const QrScannerScreen(),
      ),
      GoRoute(
        path: AppRoutes.walletTopUp,
        builder: (context, state) => const WalletTopUpScreen(),
      ),
      GoRoute(
        path: '/machines/:uuid/action',
        builder: (context, state) {
          final uuid = state.pathParameters['uuid']!;
          return MachineActionScreen(machineUuid: uuid);
        },
      ),
      GoRoute(
        path: '/machines/:uuid/book',
        builder: (context, state) {
          final uuid = state.pathParameters['uuid']!;
          return MachineBookingScreen(machineUuid: uuid);
        },
      ),
      GoRoute(
        path: '/bookings/:uuid/edit',
        builder: (context, state) {
          final uuid = state.pathParameters['uuid']!;
          return BookingModifyScreen(bookingUuid: uuid);
        },
      ),
    ],
  );
});

/// Écoute les changements Riverpod pour rafraîchir les redirections GoRouter.
class GoRouterRefreshStream extends ChangeNotifier {
  GoRouterRefreshStream(this._ref) {
    _ref.listen<AuthState>(authProvider, (_, __) => notifyListeners());
  }

  final Ref _ref;
}