flutter_app_android/lib/presentation/screens/home/home_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../navigation/bottom_nav_bar.dart';
import '../../providers/auth_provider.dart';
import '../../widgets/common/app_button.dart';

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

  @override
  Widget build(BuildContext context) {
    final authProvider = Provider.of<AuthProvider>(context);
    
    return Scaffold(
      appBar: AppBar(
        title: const Text('首页'),
        actions: [
          if (authProvider.isAuthenticated)
            IconButton(
              icon: const Icon(Icons.notifications_none),
              onPressed: () {},
            ),
        ],
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(20),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // 欢迎区域
              Card(
                elevation: 0,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(16),
                ),
                color: Colors.blue[50],
                child: Padding(
                  padding: const EdgeInsets.all(20),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Row(
                        children: [
                          CircleAvatar(
                            radius: 30,
                            backgroundColor: Colors.blue[100],
                            child: Icon(
                              Icons.person,
                              size: 30,
                              color: Colors.blue,
                            ),
                          ),
                          const SizedBox(width: 16),
                          Expanded(
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                Text(
                                  authProvider.isAuthenticated
                                      ? '您好，${authProvider.user?.fullName}'
                                      : '您好，游客',
                                  style: const TextStyle(
                                    fontSize: 18,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                                const SizedBox(height: 4),
                                Text(
                                  authProvider.isAuthenticated
                                      ? '欢迎回来！'
                                      : '请登录以使用完整功能',
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: Colors.grey[600],
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ],
                      ),
                      const SizedBox(height: 20),
                      if (!authProvider.isAuthenticated)
                        AppButton(
                          text: '立即登录',
                          onPressed: () {
                            Navigator.of(context).pushNamed('/login');
                          },
                          backgroundColor: Colors.blue,
                          height: 45,
                        ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 30),
              
              // 功能卡片
              const Text(
                '功能服务',
                style: TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                ),
              ),
              const SizedBox(height: 16),
              GridView.count(
                crossAxisCount: 3,
                shrinkWrap: true,
                physics: const NeverScrollableScrollPhysics(),
                childAspectRatio: 0.9,
                children: [
                  _buildFeatureCard(
                    icon: Icons.newspaper,
                    title: '资讯',
                    color: Colors.green,
                    onTap: () {
                      Navigator.of(context).pushNamed('/news');
                    },
                  ),
                  _buildFeatureCard(
                    icon: Icons.work,
                    title: '服务',
                    color: Colors.orange,
                    onTap: () {
                      Navigator.of(context).pushNamed('/services');
                    },
                  ),
                  _buildFeatureCard(
                    icon: Icons.person,
                    title: '我的',
                    color: Colors.purple,
                    onTap: () {
                      if (authProvider.isAuthenticated) {
                        Navigator.of(context).pushNamed('/profile');
                      } else {
                        Navigator.of(context).pushNamed('/login');
                      }
                    },
                  ),
                  _buildFeatureCard(
                    icon: Icons.settings,
                    title: '设置',
                    color: Colors.grey,
                    onTap: () {},
                  ),
                  _buildFeatureCard(
                    icon: Icons.help,
                    title: '帮助',
                    color: Colors.red,
                    onTap: () {},
                  ),
                  _buildFeatureCard(
                    icon: Icons.info,
                    title: '关于',
                    color: Colors.teal,
                    onTap: () {},
                  ),
                ],
              ),
              const SizedBox(height: 30),
              
              // 快速访问
              const Text(
                '快速访问',
                style: TextStyle(
                  fontSize: 18,
                  fontWeight: FontWeight.bold,
                ),
              ),
              const SizedBox(height: 16),
              Card(
                elevation: 2,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Column(
                  children: [
                    _buildQuickAccessItem(
                      icon: Icons.history,
                      title: '最近访问',
                      subtitle: '查看您最近的操作记录',
                    ),
                    const Divider(height: 1),
                    _buildQuickAccessItem(
                      icon: Icons.star_border,
                      title: '我的收藏',
                      subtitle: '查看您收藏的内容',
                    ),
                    const Divider(height: 1),
                    _buildQuickAccessItem(
                      icon: Icons.download,
                      title: '下载管理',
                      subtitle: '管理您的下载文件',
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 20),
              
              // 系统信息
              Card(
                elevation: 0,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(12),
                  side: BorderSide(color: Colors.grey[300]!),
                ),
                child: Padding(
                  padding: const EdgeInsets.all(16),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      const Text(
                        '系统信息',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      const SizedBox(height: 12),
                      Row(
                        children: [
                          Icon(Icons.check_circle, color: Colors.green, size: 16),
                          const SizedBox(width: 8),
                          const Expanded(
                            child: Text('系统运行正常'),
                          ),
                          Text(
                            'v1.0.0',
                            style: TextStyle(
                              color: Colors.grey[600],
                              fontSize: 12,
                            ),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
      bottomNavigationBar: const BottomNavBar(initialIndex: 0),
    );
  }
  
  Widget _buildFeatureCard({
    required IconData icon,
    required String title,
    required Color color,
    required VoidCallback onTap,
  }) {
    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(12),
      child: Card(
        elevation: 2,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(12),
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              width: 50,
              height: 50,
              decoration: BoxDecoration(
                color: Color.lerp(Colors.white, Colors.transparent, 0.9)!,  // 0.3表示30%透明
                borderRadius: BorderRadius.circular(25),
              ),
              child: Icon(
                icon,
                color: color,
                size: 28,
              ),
            ),
            const SizedBox(height: 12),
            Text(
              title,
              style: const TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.w500,
              ),
            ),
          ],
        ),
      ),
    );
  }
  
  Widget _buildQuickAccessItem({
    required IconData icon,
    required String title,
    required String subtitle,
  }) {
    return ListTile(
      leading: Icon(icon),
      title: Text(title),
      subtitle: Text(subtitle),
      trailing: const Icon(Icons.chevron_right),
      onTap: () {},
    );
  }
}