recipe-manager/mobile/lib/features/navigation/main_navigation_shell.dart

import 'package:flutter/material.dart';
import '../../core/constants/app_theme.dart';
import '../library/recipes_screen.dart';
import '../scanner/scanner_screen.dart';
import '../shopping/shopping_lists_screen.dart';

class MainNavigationShell extends StatefulWidget {
  const MainNavigationShell({super.key});

  @override
  State<MainNavigationShell> createState() => _MainNavigationShellState();
}

class _MainNavigationShellState extends State<MainNavigationShell> {
  int _currentIndex = 0;

  final List<Widget> _screens = const [
    RecipesScreen(),
    ShoppingListsScreen(),
    ScannerScreen(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(
        index: _currentIndex,
        children: _screens,
      ),
      bottomNavigationBar: Container(
        decoration: const BoxDecoration(
          border: Border(
            top: BorderSide(color: AppTheme.border, width: 1),
          ),
        ),
        child: NavigationBar(
          selectedIndex: _currentIndex,
          backgroundColor: AppTheme.surface,
          indicatorColor: AppTheme.primary.withOpacity(0.2),
          onDestinationSelected: (idx) {
            setState(() {
              _currentIndex = idx;
            });
          },
          destinations: const [
            NavigationDestination(
              icon: Icon(Icons.menu_book_outlined),
              selectedIcon: Icon(Icons.menu_book, color: AppTheme.primary),
              label: 'Cookbook',
            ),
            NavigationDestination(
              icon: Icon(Icons.shopping_cart_outlined),
              selectedIcon: Icon(Icons.shopping_cart, color: AppTheme.primary),
              label: 'Shopping',
            ),
            NavigationDestination(
              icon: Icon(Icons.document_scanner_outlined),
              selectedIcon: Icon(Icons.document_scanner, color: AppTheme.primary),
              label: 'Scanner',
            ),
          ],
        ),
      ),
    );
  }
}