import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/providers.dart';
import '../services/services.dart';
import '../widgets/widgets.dart';

/// 主页面
class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

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

class _HomeScreenState extends State<HomeScreen> {
  final TrayService _trayService = TrayService();
  final WindowService _windowService = WindowService();

  @override
  void initState() {
    super.initState();
    // 初始化数据
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final provider = context.read<MonitorProvider>();
      provider.initDefaultDevices();
      provider.refreshAll();
      provider.startAutoRefresh(intervalSeconds: 30);
      
      // 初始化系统托盘
      _initSystemTray(provider);
    });
  }

  /// 初始化系统托盘
  Future<void> _initSystemTray(MonitorProvider provider) async {
    if (!_trayService.isSupported) return;

    await _trayService.init(
      onShow: () => _windowService.showWindow(),
      onHide: () => _windowService.hideWindow(),
      onExit: () => _exitApp(),
      onRefresh: () => provider.refreshAll(),
    );

    // 设置窗口关闭事件（最小化到托盘）
    _windowService.onCloseRequested = () => _handleCloseRequest();
  }

  /// 处理窗口关闭请求
  void _handleCloseRequest() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('关闭窗口'),
        content: const Text('请选择操作：'),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.pop(context);
              _windowService.hideWindow();
            },
            child: const Text('最小化到托盘'),
          ),
          TextButton(
            onPressed: () {
              Navigator.pop(context);
              _exitApp();
            },
            child: const Text('退出程序'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('取消'),
          ),
        ],
      ),
    );
  }

  /// 退出应用
  Future<void> _exitApp() async {
    await _trayService.destroy();
    await _windowService.closeWindow();
  }

  @override
  void dispose() {
    _trayService.destroy();
    _windowService.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: _buildAppBar(),
      body: _buildBody(),
      floatingActionButton: _buildFAB(),
    );
  }

  PreferredSizeWidget _buildAppBar() {
    return AppBar(
      title: const Text('家庭网络监控'),
      centerTitle: true,
      actions: [
        Consumer<MonitorProvider>(
          builder: (context, provider, _) {
            return IconButton(
              icon: provider.isLoading
                  ? const SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.refresh),
              onPressed: provider.isLoading ? null : () => provider.refreshAll(),
              tooltip: '刷新',
            );
          },
        ),
        IconButton(
          icon: const Icon(Icons.settings),
          onPressed: () {
            _showSettingsDialog();
          },
          tooltip: '设置',
        ),
        // 最小化到托盘按钮（仅桌面端）
        if (!kIsWeb && (Platform.isWindows || Platform.isLinux || Platform.isMacOS))
          IconButton(
            icon: const Icon(Icons.minimize),
            onPressed: () => _windowService.hideWindow(),
            tooltip: '最小化到托盘',
          ),
      ],
    );
  }

  Widget _buildBody() {
    return Consumer<MonitorProvider>(
      builder: (context, provider, _) {
        return RefreshIndicator(
          onRefresh: () => provider.refreshAll(),
          child: SingleChildScrollView(
            physics: const AlwaysScrollableScrollPhysics(),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // 网速仪表盘
                SpeedGauge(
                  networkStatus: provider.networkStatus,
                  isLoading: provider.isTestingSpeed,
                ),
                
                // 概览卡片
                _buildOverviewCards(provider),
                
                // 设备列表标题
                Padding(
                  padding: const EdgeInsets.fromLTRB(16, 16, 16, 8),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Text(
                        '监控设备',
                        style: Theme.of(context).textTheme.titleMedium,
                      ),
                      TextButton.icon(
                        onPressed: () => _showAddDeviceDialog(),
                        icon: const Icon(Icons.add, size: 18),
                        label: const Text('添加'),
                      ),
                    ],
                  ),
                ),
                
                // 设备列表
                _buildDeviceList(provider),
                
                const SizedBox(height: 80),
              ],
            ),
          ),
        );
      },
    );
  }

  Widget _buildOverviewCards(MonitorProvider provider) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16),
      child: Row(
        children: [
          Expanded(
            child: StatusCard(
              title: '在线设备',
              value: '${provider.onlineDevicesCount}',
              icon: Icons.check_circle,
              iconColor: Colors.green,
              subtitle: '共 ${provider.devices.length} 台设备',
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: StatusCard(
              title: '离线设备',
              value: '${provider.offlineDevicesCount}',
              icon: Icons.error,
              iconColor: provider.offlineDevicesCount > 0 
                  ? Colors.red 
                  : Colors.grey,
              subtitle: provider.offlineDevicesCount > 0 
                  ? '需要检查' 
                  : '全部正常',
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildDeviceList(MonitorProvider provider) {
    if (provider.devices.isEmpty) {
      return const Center(
        child: Padding(
          padding: EdgeInsets.all(32),
          child: Column(
            children: [
              Icon(Icons.devices, size: 64, color: Colors.grey),
              SizedBox(height: 16),
              Text('暂无监控设备'),
              SizedBox(height: 8),
              Text('点击右上角添加设备', style: TextStyle(color: Colors.grey)),
            ],
          ),
        ),
      );
    }

    return ListView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      itemCount: provider.devices.length,
      itemBuilder: (context, index) {
        final device = provider.devices[index];
        return DeviceTile(
          device: device,
          onRefresh: () => provider.checkSingleDevice(device.id),
          onTap: () => _showDeviceDetail(device),
        );
      },
    );
  }

  Widget _buildFAB() {
    return Consumer<MonitorProvider>(
      builder: (context, provider, _) {
        return FloatingActionButton.extended(
          onPressed: provider.isTestingSpeed ? null : () => provider.runSpeedTest(),
          icon: provider.isTestingSpeed
              ? const SizedBox(
                  width: 20,
                  height: 20,
                  child: CircularProgressIndicator(
                    strokeWidth: 2,
                    color: Colors.white,
                  ),
                )
              : const Icon(Icons.speed),
          label: Text(provider.isTestingSpeed ? '测速中...' : '测速'),
        );
      },
    );
  }

  void _showSettingsDialog() {
    final provider = context.read<MonitorProvider>();
    int interval = provider.refreshInterval;

    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('设置'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            ListTile(
              title: const Text('自动刷新间隔'),
              subtitle: Text('$interval 秒'),
              trailing: DropdownButton<int>(
                value: interval,
                items: const [
                  DropdownMenuItem(value: 10, child: Text('10秒')),
                  DropdownMenuItem(value: 30, child: Text('30秒')),
                  DropdownMenuItem(value: 60, child: Text('1分钟')),
                  DropdownMenuItem(value: 300, child: Text('5分钟')),
                ],
                onChanged: (value) {
                  if (value != null) {
                    provider.setRefreshInterval(value);
                    Navigator.pop(context);
                  }
                },
              ),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('关闭'),
          ),
        ],
      ),
    );
  }

  void _showAddDeviceDialog() {
    // TODO: 实现添加设备对话框
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text('添加设备功能开发中...')),
    );
  }

  void _showDeviceDetail(device) {
    // TODO: 实现设备详情页
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('设备: ${device.name}')),
    );
  }
}