import 'dart:async';
import 'dart:convert';
import 'package:get/get.dart';
import 'package:web_socket_channel/web_socket_channel.dart';
import 'package:web_socket_channel/status.dart' as status;

class WebSocketService extends GetxService {
  //webscoket地址
  static const String WS_URL = 'ws://192.168.1.129:8089/ws';
  
  WebSocketChannel? _channel;
  final RxBool isConnected = false.obs;
  final RxString connectionStatus = '未连接'.obs;
  
  // 当前选中的设备UUID
  final RxString selectedDeviceUuid = ''.obs;
  
  Timer? _reconnectTimer;
  int _reconnectAttempts = 0;
  static const int MAX_RECONNECT_ATTEMPTS = 10;
  
  @override
  void onClose() {
    disconnect();
    _reconnectTimer?.cancel();
    super.onClose();
  }
  
  Future<void> connect() async {
    try {
      _channel = WebSocketChannel.connect(Uri.parse(WS_URL));
      isConnected.value = true;
      connectionStatus.value = '已连接';
      _reconnectAttempts = 0;
      
      _sendMessage({
        'type': 'web_register',
        'clientId': 'web_client_${DateTime.now().millisecondsSinceEpoch}',
      });
      
      _channel!.stream.listen(
        (message) {
          _handleMessage(message);
        },
        onError: (error) {
          print('WebSocket错误: $error');
          connectionStatus.value = '错误: $error';
          isConnected.value = false;
          _scheduleReconnect();
        },
        onDone: () {
          print('WebSocket连接断开');
          connectionStatus.value = '已断开';
          isConnected.value = false;
          _scheduleReconnect();
        },
      );
      
    } catch (e) {
      print('WebSocket连接失败: $e');
      connectionStatus.value = '连接失败';
      isConnected.value = false;
      _scheduleReconnect();
    }
  }
  
  void _scheduleReconnect() {
    if (_reconnectAttempts >= MAX_RECONNECT_ATTEMPTS) {
      connectionStatus.value = '重连失败，请手动刷新';
      return;
    }
    
    _reconnectTimer?.cancel();
    _reconnectTimer = Timer(Duration(seconds: 5), () {
      _reconnectAttempts++;
      connectionStatus.value = '重连中 (${_reconnectAttempts}/$MAX_RECONNECT_ATTEMPTS)...';
      connect();
    });
  }
  
  void disconnect() {
    _channel?.sink.close(status.goingAway);
    _channel = null;
    isConnected.value = false;
    connectionStatus.value = '已断开';
  }
  
  void _sendMessage(Map<String, dynamic> message) {
    if (_channel != null && isConnected.value) {
      _channel!.sink.add(jsonEncode(message));
    } else {
      print('WebSocket未连接，无法发送消息: $message');
    }
  }
  
  final List<Function(Map<String, dynamic>)> _messageHandlers = [];
  
  void registerMessageHandler(Function(Map<String, dynamic>) handler) {
    _messageHandlers.add(handler);
  }
  
  void _handleMessage(dynamic message) {
    try {
      final data = jsonDecode(message);
      for (var handler in _messageHandlers) {
        handler(data);
      }
    } catch (e) {
      print('解析消息失败: $e');
    }
  }
  
  // ==================== 公开方法 ====================
  
  // 选择要控制的设备（建立连接）
  void selectDevice(String uuid) {
    selectedDeviceUuid.value = uuid;
    _sendMessage({
      'type': 'select_device',
      'targetUuid': uuid,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('选择设备: $uuid');
  }
  
  // 开始扫描
  void startScan() {
    if (selectedDeviceUuid.value.isEmpty) {
      print('请先选择设备');
      return;
    }
    _sendMessage({
      'type': 'scan',
      'targetUuid': selectedDeviceUuid.value,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('发送扫描命令');
  }
  
  // 停止扫描
  void stopScan() {
    if (selectedDeviceUuid.value.isEmpty) {
      print('请先选择设备');
      return;
    }
    _sendMessage({
      'type': 'stop_scan',
      'targetUuid': selectedDeviceUuid.value,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('发送停止扫描命令');
  }
  
  // 连接蓝牙设备
  void connectToDevice(String deviceId) {
    if (selectedDeviceUuid.value.isEmpty) {
      print('请先选择设备');
      return;
    }
    _sendMessage({
      'type': 'connect',
      'targetUuid': selectedDeviceUuid.value,
      'deviceId': deviceId,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('连接蓝牙设备: $deviceId');
  }
  
  // 断开蓝牙设备
  void disconnectDevice() {
    if (selectedDeviceUuid.value.isEmpty) {
      print('请先选择设备');
      return;
    }
    _sendMessage({
      'type': 'disconnect',
      'targetUuid': selectedDeviceUuid.value,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('断开蓝牙设备');
  }
  
  // 发送数据到设备
  void sendDataToDevice(String data) {
    if (selectedDeviceUuid.value.isEmpty) {
      print('请先选择设备');
      return;
    }
    _sendMessage({
      'type': 'send_data',
      'targetUuid': selectedDeviceUuid.value,
      'data': data,
      'timestamp': DateTime.now().toIso8601String(),
    });
    print('发送数据: $data');
  }
}