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

import '../auth/auth_provider.dart';
import '../../features/auth/login_screen.dart';
import '../../features/auth/register_screen.dart';
import '../../features/home/home_screen.dart';
import '../../features/products/products_screen.dart';
import '../../features/menu/menu_screen.dart';
import '../../features/recipes/recipes_screen.dart';
import '../../features/profile/profile_screen.dart';

final routerProvider = Provider<GoRouter>((ref) {
  final authState = ref.watch(authProvider);

  return GoRouter(
    initialLocation: '/home',
    redirect: (context, state) {
      final isLoggedIn = authState.status == AuthStatus.authenticated;
      final isAuthRoute = state.matchedLocation.startsWith('/auth');

      if (authState.status == AuthStatus.unknown) return null;
      if (!isLoggedIn && !isAuthRoute) return '/auth/login';
      if (isLoggedIn && isAuthRoute) return '/home';
      return null;
    },
    routes: [
      GoRoute(
        path: '/auth/login',
        builder: (_, __) => const LoginScreen(),
      ),
      GoRoute(
        path: '/auth/register',
        builder: (_, __) => const RegisterScreen(),
      ),
      ShellRoute(
        builder: (context, state, child) => MainShell(child: child),
        routes: [
          GoRoute(path: '/home', builder: (_, __) => const HomeScreen()),
          GoRoute(
              path: '/products',
              builder: (_, __) => const ProductsScreen()),
          GoRoute(path: '/menu', builder: (_, __) => const MenuScreen()),
          GoRoute(
              path: '/recipes', builder: (_, __) => const RecipesScreen()),
          GoRoute(
              path: '/profile', builder: (_, __) => const ProfileScreen()),
        ],
      ),
    ],
  );
});

class MainShell extends StatelessWidget {
  final Widget child;

  const MainShell({super.key, required this.child});

  static const _tabs = [
    '/home',
    '/products',
    '/menu',
    '/recipes',
    '/profile',
  ];

  @override
  Widget build(BuildContext context) {
    final location = GoRouterState.of(context).matchedLocation;
    final currentIndex = _tabs.indexOf(location).clamp(0, _tabs.length - 1);

    return Scaffold(
      body: child,
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: currentIndex,
        onTap: (index) => context.go(_tabs[index]),
        items: const [
          BottomNavigationBarItem(
              icon: Icon(Icons.home), label: 'Главная'),
          BottomNavigationBarItem(
              icon: Icon(Icons.kitchen), label: 'Продукты'),
          BottomNavigationBarItem(
              icon: Icon(Icons.calendar_month), label: 'Меню'),
          BottomNavigationBarItem(
              icon: Icon(Icons.menu_book), label: 'Рецепты'),
          BottomNavigationBarItem(
              icon: Icon(Icons.person), label: 'Профиль'),
        ],
      ),
    );
  }
}