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

import '../../features/admin/presentation/screens/admin_home_screen.dart';
import '../../features/admin/presentation/screens/system_settings_screen.dart';
import '../../features/admin/presentation/screens/user_management_screen.dart';
import '../../features/auth/presentation/screens/login_screen.dart';
import '../../features/auth/presentation/screens/register_screen.dart';
import '../../features/dashboard/presentation/screens/dashboard_screen.dart';
import '../../features/user/presentation/screens/user_home_screen.dart';
import '../../features/user/presentation/screens/user_profile_screen.dart';
import '../../shared/providers/auth_provider.dart';
import '../../shared/widgets/app_scaffold.dart';
import 'auth_guard.dart';
import 'route_names.dart';

part 'app_router.g.dart';

@Riverpod(keepAlive: true)
GoRouter appRouter(Ref ref) {
  final authGuard = AuthGuard(ref);
  final authState = ref.watch(authStateProvider);

  return GoRouter(
    initialLocation: RoutePaths.login,
    debugLogDiagnostics: true,
    refreshListenable: _GoRouterRefreshStream(ref, authState),
    redirect: (context, state) {
      final location = state.uri.toString();
      return authGuard.redirect(context, location);
    },
    routes: [
      // Auth Routes (비인증)
      GoRoute(
        name: RouteNames.login,
        path: RoutePaths.login,
        builder: (context, state) => const LoginScreen(),
      ),
      GoRoute(
        name: RouteNames.register,
        path: RoutePaths.register,
        builder: (context, state) => const RegisterScreen(),
      ),

      // User Shell Route
      ShellRoute(
        builder: (context, state, child) => AppScaffold(
          currentPath: state.uri.toString(),
          child: child,
        ),
        routes: [
          GoRoute(
            name: RouteNames.userHome,
            path: RoutePaths.userHome,
            builder: (context, state) => const UserHomeScreen(),
          ),
          GoRoute(
            name: RouteNames.userProfile,
            path: RoutePaths.userProfile,
            builder: (context, state) => const UserProfileScreen(),
          ),
          GoRoute(
            name: RouteNames.userDashboard,
            path: RoutePaths.userDashboard,
            builder: (context, state) => const DashboardScreen(),
          ),
        ],
      ),

      // Admin Shell Route
      ShellRoute(
        builder: (context, state, child) => AppScaffold(
          currentPath: state.uri.toString(),
          isAdmin: true,
          child: child,
        ),
        routes: [
          GoRoute(
            name: RouteNames.adminHome,
            path: RoutePaths.adminHome,
            builder: (context, state) => const AdminHomeScreen(),
          ),
          GoRoute(
            name: RouteNames.adminUsers,
            path: RoutePaths.adminUsers,
            builder: (context, state) => const UserManagementScreen(),
          ),
          GoRoute(
            name: RouteNames.adminDashboard,
            path: RoutePaths.adminDashboard,
            builder: (context, state) => const DashboardScreen(),
          ),
          GoRoute(
            name: RouteNames.adminSettings,
            path: RoutePaths.adminSettings,
            builder: (context, state) => const SystemSettingsScreen(),
          ),
        ],
      ),
    ],
  );
}

/// GoRouter에서 Riverpod 상태 변경 시 리프레시하기 위한 Listenable 래퍼
class _GoRouterRefreshStream extends ChangeNotifier {
  _GoRouterRefreshStream(this.ref, dynamic _) {
    // authState 변경 시 GoRouter refresh 트리거
    notifyListeners();
  }

  final Ref ref;
}