import 'package:flutter/material.dart';
import 'activity_list_screen.dart';
import 'friends_screen.dart';
import 'services_screen.dart';
import 'ai_chat_screen.dart';
import 'messages_screen.dart';
import 'profile_screen.dart';
import 'create_activity_screen.dart';

class MainScreen extends StatefulWidget {
  const MainScreen({super.key});
  @override
  State<MainScreen> createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {
  int _currentIndex = 0;

  final _screens = [
    ActivityListScreen(),
    FriendsScreen(),
    ServicesScreen(),
    AiChatScreen(),
    MessagesScreen(),
    ProfileScreen(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(index: _currentIndex, children: _screens),
      floatingActionButton: _buildGlobalFab(),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: (i) => setState(() => _currentIndex = i),
        items: const [
          BottomNavigationBarItem(icon: Icon(Icons.home_outlined), activeIcon: Icon(Icons.home), label: '首页'),
          BottomNavigationBarItem(icon: Icon(Icons.people_outline), activeIcon: Icon(Icons.people), label: '好友'),
          BottomNavigationBarItem(icon: Icon(Icons.grid_view_outlined), activeIcon: Icon(Icons.grid_view), label: '服务'),
          BottomNavigationBarItem(icon: Icon(Icons.smart_toy_outlined), activeIcon: Icon(Icons.smart_toy), label: 'AI管家'),
          BottomNavigationBarItem(icon: Icon(Icons.message_outlined), activeIcon: Icon(Icons.message), label: '消息'),
          BottomNavigationBarItem(icon: Icon(Icons.person_outline), activeIcon: Icon(Icons.person), label: '我的'),
        ],
      ),
    );
  }

  Widget _buildGlobalFab() {
    return Container(
      width: 56,
      height: 56,
      margin: const EdgeInsets.only(top: 30),
      decoration: BoxDecoration(
        shape: BoxShape.circle,
        gradient: const LinearGradient(
          colors: [Color(0xFFFF6B35), Color(0xFFFFB84D)],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        boxShadow: [
          BoxShadow(
            color: const Color(0xFFFF6B35).withOpacity(0.35),
            blurRadius: 12,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: Material(
        color: Colors.transparent,
        child: InkWell(
          onTap: () {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (_) => CreateActivityScreen()),
            );
          },
          customBorder: const CircleBorder(),
          child: const Icon(Icons.add, color: Colors.white, size: 28),
        ),
      ),
    );
  }
}