import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'today_screen.dart';
import 'stats_screen.dart';
import 'settings_screen.dart';
import '../providers/background_sync_provider.dart';

class HomeScreen extends ConsumerStatefulWidget {
  const HomeScreen({super.key});

  @override
  ConsumerState<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends ConsumerState<HomeScreen> {
  int _currentIndex = 0;

  final List<Widget> _screens = [
    const TodayScreen(),
    const StatsScreen(),
    const SettingsScreen(),
  ];

  @override
  void initState() {
    super.initState();
    // Web 平台不启动后台同步服务
    if (!kIsWeb) {
      // 启动后台同步服务
      WidgetsBinding.instance.addPostFrameCallback((_) {
        final syncService = ref.read(backgroundSyncServiceProvider);
        syncService.start();
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(
        index: _currentIndex,
        children: _screens,
      ),
      bottomNavigationBar: NavigationBar(
        selectedIndex: _currentIndex,
        onDestinationSelected: (index) {
          setState(() {
            _currentIndex = index;
          });
        },
        destinations: const [
          NavigationDestination(
            icon: Icon(Icons.today_outlined),
            selectedIcon: Icon(Icons.today),
            label: 'Today',
          ),
          NavigationDestination(
            icon: Icon(Icons.bar_chart_outlined),
            selectedIcon: Icon(Icons.bar_chart),
            label: 'Stats',
          ),
          NavigationDestination(
            icon: Icon(Icons.settings_outlined),
            selectedIcon: Icon(Icons.settings),
            label: 'Settings',
          ),
        ],
      ),
    );
  }
}