صحح الكود
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:flutter_foreground_task/flutter_foreground_task.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Network Monitor',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        fontFamily: 'Tajawal',
      ),
      home: const LoginScreen(),
    );
  }
}

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

  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isLoggingIn = false;

  @override
  void dispose() {
    _usernameController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  Future<void> _login() async {
    if (!_formKey.currentState!.validate()) return;

    setState(() => _isLoggingIn = true);

    try {
      final response = await http.post(
        Uri.parse('http://172.16.0.1/login'),
        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
        body: {
          'username': _usernameController.text,
          'password': _passwordController.text,
        },
      ).timeout(const Duration(seconds: 10));

      if (response.statusCode == 200) {
        final data = json.decode(response.body);
        
        if (data['status'] == 'success' && mounted) {
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(
              builder: (context) => DashboardScreen(
                username: _usernameController.text,
                userData: {
                  'username': _usernameController.text,
                  'ip': data['ip'] ?? 'غير معروف',
                  'mac': data['mac'] ?? 'غير معروف',
                },
              ),
            ),
          );
        } else {
          throw Exception(data['message'] ?? 'فشل تسجيل الدخول');
        }
      } else {
        throw Exception('فشل الاتصال بالخادم');
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('حدث خطأ: ${e.toString()}'),
            backgroundColor: Colors.red,
          ),
        );
      }
    } finally {
      if (mounted) {
        setState(() => _isLoggingIn = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Directionality(
      textDirection: TextDirection.rtl,
      child: Scaffold(
        backgroundColor: const Color(0xFFF8FAFD),
        body: SafeArea(
          child: Padding(
            padding: const EdgeInsets.all(24.0),
            child: Form(
              key: _formKey,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const FlutterLogo(size: 100),
                  const SizedBox(height: 32),
                  TextFormField(
                    controller: _usernameController,
                    decoration: const InputDecoration(
                      labelText: 'اسم المستخدم',
                      prefixIcon: Icon(Icons.person),
                      border: OutlineInputBorder(),
                    ),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'الرجاء إدخال اسم المستخدم';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _passwordController,
                    obscureText: true,
                    decoration: const InputDecoration(
                      labelText: 'كلمة المرور',
                      prefixIcon: Icon(Icons.lock),
                      border: OutlineInputBorder(),
                    ),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'الرجاء إدخال كلمة المرور';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 24),
                  SizedBox(
                    width: double.infinity,
                    height: 50,
                    child: ElevatedButton(
                      onPressed: _isLoggingIn ? null : _login,
                      style: ElevatedButton.styleFrom(
                        backgroundColor: const Color(0xFF2E5BFF),
                      ),
                      child: _isLoggingIn
                          ? const CircularProgressIndicator(color: Colors.white)
                          : const Text(
                              'تسجيل الدخول',
                              style: TextStyle(fontSize: 16),
                            ),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class DashboardScreen extends StatefulWidget {
  final String username;
  final Map<String, dynamic> userData;

  const DashboardScreen({
    super.key,
    required this.username,
    required this.userData,
  });

  @override
  State<DashboardScreen> createState() => _DashboardScreenState();
}

class _DashboardScreenState extends State<DashboardScreen> with WidgetsBindingObserver {
  bool _isLoggingOut = false;
  Timer? _timer;
  late Map<String, dynamic> _currentUserData;
  bool _isForegroundServiceRunning = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    _currentUserData = widget.userData;
    _startPeriodicUpdate();
    _initForegroundService();
  }

  @override
  void dispose() {
    _timer?.cancel();
    WidgetsBinding.instance.removeObserver(this);
    _stopForegroundService();
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.paused) {
      _startForegroundService();
    } else if (state == AppLifecycleState.resumed) {
      _stopForegroundService();
    }
  }

  void _initForegroundService() {
    FlutterForegroundTask.init(
      androidNotificationOptions: AndroidNotificationOptions(
        channelId: 'network_monitor_channel',
        channelName: 'Network Monitor',
        channelDescription: 'عرض حالة الشبكة عند الخروج من التطبيق',
        channelImportance: NotificationChannelImportance.LOW,
        priority: NotificationPriority.LOW,
        iconData: const NotificationIconData(
          resType: ResourceType.mipmap,
          resPrefix: ResourcePrefix.ic,
          name: 'launcher',
        ),
      ),
      iosNotificationOptions: const IOSNotificationOptions(
        showNotification: true,
        playSound: false,
      ),
      foregroundTaskOptions: const ForegroundTaskOptions(
        interval: 5000,
        isOnceEvent: false,
        autoRunOnBoot: false,
        allowWakeLock: true,
        allowWifiLock: true,
      ),
    );
  }

  Future<void> _startForegroundService() async {
    if (_isForegroundServiceRunning) return;

    final isInitSuccess = await FlutterForegroundTask.init(
      androidNotificationOptions: AndroidNotificationOptions(
        channelId: 'network_monitor_channel',
        channelName: 'Network Monitor',
        channelDescription: 'عرض حالة الشبكة عند الخروج من التطبيق',
        channelImportance: NotificationChannelImportance.LOW,
        priority: NotificationPriority.LOW,
        iconData: const NotificationIconData(
          resType: ResourceType.mipmap,
          resPrefix: ResourcePrefix.ic,
          name: 'launcher',
        ),
      ),
    );

    if (!isInitSuccess) return;

    await FlutterForegroundTask.startService(
      notificationTitle: 'حالة الشبكة - ${_currentUserData['username']}',
      notificationText: 'جاري تحديث البيانات...',
      callback: startCallback,
    );

    setState(() => _isForegroundServiceRunning = true);
  }

  Future<void> _stopForegroundService() async {
    await FlutterForegroundTask.stopService();
    setState(() => _isForegroundServiceRunning = false);
  }

  void _startPeriodicUpdate() {
    _timer = Timer.periodic(const Duration(seconds: 1), (timer) async {
      await _updateUserData();
    });
  }

  Future<void> _updateUserData() async {
    try {
      final response = await http
          .get(Uri.parse('http://172.16.0.1/status?var=json'))
          .timeout(const Duration(seconds: 10));

      if (response.statusCode == 200) {
        final data = json.decode(response.body);

        if (data.containsKey('errors')) {
          return;
        }

        if (!mounted) return;

        setState(() {
          _currentUserData = {
            'logged_in': data['logged_in'] ?? 'no',
            'username': data['username'] ?? widget.username,
            'mac': _decodeMacAddress(data['mac'] ?? ''),
            'ip': data['ip'] ?? 'غير معروف',
            'bytes_in': _formatBytes(data['bytes_in'] ?? '0'),
            'bytes_out': _formatBytes(data['bytes_out'] ?? '0'),
            'remain_bytes_total': _formatBytes(data['remain_bytes_total'] ?? '0'),
            'uptime': _formatUptimeExtended(data['uptime'] ?? '0s'),
            'session_time_left': _formatSessionTimeLeft(data['session_time_left'] ?? 'غير محدود'),
          };
        });

        if (_isForegroundServiceRunning) {
          FlutterForegroundTask.updateService(
            notificationTitle: 'حالة الشبكة - ${_currentUserData['username']}',
            notificationText: '''
            IP: ${_currentUserData['ip']}
            المستلم: ${_currentUserData['bytes_in']}
            المرسل: ${_currentUserData['bytes_out']}
            المتبقي: ${_currentUserData['session_time_left']}
            ''',
          );
        }
      }
    } catch (e) {
      if (_isForegroundServiceRunning) {
        FlutterForegroundTask.updateService(
          notificationTitle: 'حالة الشبكة - ${_currentUserData['username']}',
          notificationText: 'خطأ في تحديث البيانات',
        );
      }
    }
  }

  Future<void> _logout() async {
    setState(() => _isLoggingOut = true);

    try {
      await _stopForegroundService();
      
      final response = await http.post(
        Uri.parse('http://172.16.0.1/logout'),
        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
        body: {'username': widget.username},
      ).timeout(const Duration(seconds: 10));

      if (response.statusCode == 200) {
        if (mounted) {
          Navigator.pushAndRemoveUntil(
            context,
            MaterialPageRoute(builder: (_) => const LoginScreen()),
            (route) => false,
          );
        }
      } else {
        throw Exception('فشل في تسجيل الخروج');
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('حدث خطأ: ${e.toString()}'),
            backgroundColor: Colors.red,
          ),
        );
      }
    } finally {
      if (mounted) {
        setState(() => _isLoggingOut = false);
      }
    }
  }

  String _decodeMacAddress(String encodedMac) {
    return encodedMac.replaceAll('%3A', ':');
  }

  String _formatBytes(String bytes) {
    try {
      final value = int.parse(bytes);
      if (value < 1024) return '$value بايت';
      if (value < 1024 * 1024) return '${(value / 1024).toStringAsFixed(1)} كيلوبايت';
      if (value < 1024 * 1024 * 1024) return '${(value / (1024 * 1024)).toStringAsFixed(1)} ميجابايت';
      return '${(value / (1024 * 1024 * 1024)).toStringAsFixed(1)} جيجابايت';
    } catch (e) {
      return bytes;
    }
  }

  String _formatUptimeExtended(String uptime) {
    final regex = RegExp(r'(?:(\d+)d)?(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?');
    final match = regex.firstMatch(uptime);
    if (match == null) return uptime;

    final days = int.tryParse(match.group(1) ?? '0') ?? 0;
    final hours = int.tryParse(match.group(2) ?? '0') ?? 0;
    final minutes = int.tryParse(match.group(3) ?? '0') ?? 0;
    final seconds = int.tryParse(match.group(4) ?? '0') ?? 0;

    String result = '';
    if (days > 0) result += '$days يوم ';
    if (hours > 0) result += '$hours ساعة ';
    if (minutes > 0) result += '$minutes دقيقة ';
    if (seconds > 0) result += '$seconds ثانية';

    return result.trim();
  }

  String _formatSessionTimeLeft(String sessionTimeLeft) {
    if (sessionTimeLeft == 'غير محدود') return sessionTimeLeft;
    return _formatUptimeExtended(sessionTimeLeft);
  }

  @override
  Widget build(BuildContext context) {
    return WithForegroundTask(
      child: Directionality(
        textDirection: TextDirection.rtl,
        child: Scaffold(
          backgroundColor: const Color(0xFFF8FAFD),
          appBar: AppBar(
            title: const Text('لوحة التحكم'),
            centerTitle: true,
            elevation: 0,
            backgroundColor: Colors.transparent,
            foregroundColor: const Color(0xFF2E5BFF),
            automaticallyImplyLeading: false,
          ),
          body: SafeArea(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                children: [
                  _buildModernUserCard(context),
                  const SizedBox(height: 24),
                  Expanded(
                    child: GridView.count(
                      crossAxisCount: 2,
                      childAspectRatio: 1.1,
                      crossAxisSpacing: 16,
                      mainAxisSpacing: 16,
                      children: [
                        _buildModernStatCard(
                          icon: Icons.access_time_rounded,
                          title: 'مدة الاتصال',
                          value: _currentUserData['uptime'] ?? 'غير معروف',
                          color: const Color(0xFF2E5BFF),
                        ),
                        _buildModernStatCard(
                          icon: Icons.download_rounded,
                          title: 'البيانات المستلمة',
                          value: _currentUserData['bytes_in'] ?? '0',
                          color: const Color(0xFF00C1D4),
                        ),
                        _buildModernStatCard(
                          icon: Icons.upload_rounded,
                          title: 'البيانات المرسلة',
                          value: _currentUserData['bytes_out'] ?? '0',
                          color: const Color(0xFFFF8A34),
                        ),
                        _buildModernStatCard(
                          icon: Icons.timer_rounded,
                          title: 'الوقت المتبقي',
                          value: _currentUserData['session_time_left'] ?? 'غير محدود',
                          color: const Color(0xFF50B83C),
                        ),
                        _buildModernStatCard(
                          icon: Icons.storage_rounded,
                          title: 'البيانات المتبقية',
                          value: _currentUserData['remain_bytes_total'] ?? '0',
                          color: const Color(0xFF9C6ADE),
                        ),
                        _buildModernStatCard(
                          icon: Icons.network_wifi_rounded,
                          title: 'حالة الاتصال',
                          value: 'نشط',
                          color: const Color(0xFFF7C948),
                        ),
                      ],
                    ),
                  ),
                  const SizedBox(height: 16),
                  SizedBox(
                    width: double.infinity,
                    child: ElevatedButton(
                      onPressed: _isLoggingOut ? null : _logout,
                      style: ElevatedButton.styleFrom(
                        backgroundColor: const Color(0xFFFF453A),
                        foregroundColor: Colors.white,
                        padding: const EdgeInsets.symmetric(vertical: 16),
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(12),
                        ),
                        elevation: 0,
                      ),
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          if (_isLoggingOut)
                            const SizedBox(
                              width: 20,
                              height: 20,
                              child: CircularProgressIndicator(
                                color: Colors.white,
                                strokeWidth: 2,
                              ),
                            )
                          else
                            const Icon(Icons.logout_rounded, size: 20),
                          const SizedBox(width: 8),
                          Text(
                            _isLoggingOut ? 'جاري تسجيل الخروج...' : 'تسجيل الخروج',
                            style: const TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildModernUserCard(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(16),
        gradient: const LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [Color(0xFF2E5BFF), Color(0xFF6894FF)],
        ),
        boxShadow: [
          BoxShadow(
            color: Colors.blue.withOpacity(0.2),
            blurRadius: 10,
            offset: const Offset(0, 5),
          ),
        ],
      ),
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          children: [
            Row(
              children: [
                Container(
                  width: 60,
                  height: 60,
                  decoration: BoxDecoration(
                    color: Colors.white.withOpacity(0.2),
                    shape: BoxShape.circle,
                  ),
                  child: const Icon(
                    Icons.person_rounded,
                    size: 30,
                    color: Colors.white,
                  ),
                ),
                const SizedBox(width: 16),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        _currentUserData['username'] ?? widget.username,
                        style: const TextStyle(
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                          fontFamily: 'Tajawal',
                          color: Colors.white,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      const SizedBox(height: 4),
                      const Text(
                        'مستخدم Hotspot',
                        style: TextStyle(
                          fontSize: 14,
                          color: Colors.white70,
                          fontFamily: 'Tajawal',
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),
            Divider(color: Colors.white.withOpacity(0.2), height: 1),
            const SizedBox(height: 12),
            _buildModernInfoRow(
              Icons.language_rounded,
              'عنوان IP:',
              _currentUserData['ip'] ?? 'غير معروف',
              Colors.white,
            ),
            _buildModernInfoRow(
              Icons.settings_ethernet_rounded,
              'عنوان MAC:',
              _currentUserData['mac'] ?? 'غير معروف',
              Colors.white,
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildModernInfoRow(
    IconData icon,
    String label,
    String value,
    Color color,
  ) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        children: [
          Icon(icon, size: 20, color: color.withOpacity(0.8)),
          const SizedBox(width: 12),
          Text(
            label,
            style: TextStyle(
              fontWeight: FontWeight.bold,
              fontFamily: 'Tajawal',
              fontSize: 15,
              color: color.withOpacity(0.9),
            ),
          ),
          const SizedBox(width: 8),
          Expanded(
            child: Text(
              value,
              style: TextStyle(
                color: color,
                overflow: TextOverflow.ellipsis,
                fontFamily: 'Tajawal',
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildModernStatCard({
    required IconData icon,
    required String title,
    required String value,
    required Color color,
  }) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.grey.withOpacity(0.1),
            blurRadius: 10,
            offset: const Offset(0, 5),
          ),
        ],
      ),
      child: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Container(
              padding: const EdgeInsets.all(10),
              decoration: BoxDecoration(
                color: color.withOpacity(0.1),
                borderRadius: BorderRadius.circular(12),
              ),
              child: Icon(icon, size: 24, color: color),
            ),
            const SizedBox(height: 12),
            Text(
              value,
              style: const TextStyle(
                fontFamily: 'Tajawal',
                fontSize: 16,
                fontWeight: FontWeight.bold,
                color: Color(0xFF2E384D),
              ),
            ),
            const SizedBox(height: 4),
            Text(
              title,
              style: const TextStyle(
                fontFamily: 'Tajawal',
                fontSize: 13,
                color: Color(0xFF8798AD),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

@pragma('vm:entry-point')
void startCallback() {
  FlutterForegroundTask.setTaskHandler(NetworkStatusTaskHandler());
}

class NetworkStatusTaskHandler extends TaskHandler {
  @override
  Future<void> onStart(DateTime timestamp) async {}

  @override
  Future<void> onEvent(DateTime timestamp, SendPort? sendPort) async {}

  @override
  Future<void> onDestroy(DateTime timestamp) async {}
}