import 'dart:async';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:ble_service/ble_service.dart';

/// BLE测试控制器
/// 用于测试BLE服务插件的功能
class BleTestController extends GetxController {
  // 设备列表
  final deviceList = <BleDevice>[].obs;
  
  // 扫描状态
  final isScanning = false.obs;
  
  // 连接状态
  final isConnected = false.obs;
  final connectionState = 0.obs;
  
  // 设备信息
  final connectedDeviceAddress = ''.obs;
  final batteryLevel = 0.obs;
  final firmwareVersion = ''.obs;
  
  // 状态消息
  final statusMessage = ''.obs;
  
  // BLE服务
  final _bleService = BleService();
  
  // 订阅
  late StreamSubscription _scanSubscription;
  late StreamSubscription _connectionSubscription;
  late StreamSubscription _dataSubscription;
  late StreamSubscription _statusSubscription;
  
  @override
  void onInit() {
    super.onInit();
    _initBleService();
  }
  
  /// 初始化BLE服务
  Future<void> _initBleService() async {
    try {
      // 初始化BLE服务
      final result = await _bleService.initialize();
      if (result) {
        statusMessage.value = 'BLE服务初始化成功';
        
        // 注册回调
        await _bleService.registerCallback();
        
        // 订阅扫描结果
        _scanSubscription = _bleService.onScanResults.listen((devices) {
          if (devices.isEmpty) {
            deviceList.clear();
            return;
          }
          
          bool hasChanges = false;
          
          for (final newDevice in devices) {
            int existingIndex = deviceList.indexWhere((d) => d.id == newDevice.id);
            if (existingIndex >= 0) {
              BleDevice existing = deviceList[existingIndex];
              if (existing.rssi != newDevice.rssi || existing.name != newDevice.name) {
                deviceList[existingIndex] = newDevice;
                hasChanges = true;
              }
            } else {
              deviceList.add(newDevice);
              hasChanges = true;
            }
          }
          
          if (hasChanges) {
            deviceList.refresh();
          }
        });
        
        // 订阅连接状态
        _connectionSubscription = _bleService.onConnectionChanged.listen((state) {
          if (state is int) {
            connectionState.value = state;
            isConnected.value = state == BleConnectionState.connected;
            statusMessage.value = '连接状态变更: ${_getStateString(state)}';
          }
        });
        
        // 订阅数据
        _dataSubscription = _bleService.onDataReceived.listen((data) {
          if (data is Map) {
            final type = data['type'];
            if (type == 'wakeup') {
              statusMessage.value = '收到唤醒信号';
            } else if (type == 'audioData') {
              statusMessage.value = '收到音频数据: ${(data['data'] as Uint8List).length} 字节';
            } else if (type == 'rawData') {
              statusMessage.value = '收到原始数据: ${(data['data'] as Uint8List).length} 字节';
            }
          }
        });
        
        // 订阅状态更新
        _statusSubscription = _bleService.onStatusUpdated.listen((status) {
          if (status is Map) {
            final type = status['type'];
            if (type == 'statusUpdate') {
              // 更新状态
              connectionState.value = status['connectionState'] as int? ?? 0;
              isConnected.value = connectionState.value == BleConnectionState.connected;
              batteryLevel.value = status['batteryLevel'] as int? ?? 0;
              firmwareVersion.value = status['firmwareVersion'] as String? ?? '';
              connectedDeviceAddress.value = status['connectedDevice'] as String? ?? '';
              
              statusMessage.value = '状态更新: ${_getStateString(connectionState.value)}';
            } else if (type == 'deviceInfo') {
              // 设备信息
              final infoType = status['infoType'] as int;
              final infoData = status['infoData'] as String;
              
              statusMessage.value = '设备信息: $infoData';
              
              // 处理不同类型的设备信息
              if (infoType == 0x80) { // 版本信息
                firmwareVersion.value = infoData;
              }
            }
          }
        });
        
        // 获取连接状态
        _updateConnectionState();
      } else {
        statusMessage.value = 'BLE服务初始化失败';
      }
    } catch (e) {
      statusMessage.value = '初始化异常: $e';
      Get.snackbar('初始化失败', '无法初始化BLE服务: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 获取状态字符串
  String _getStateString(int state) {
    switch (state) {
      case BleConnectionState.disconnected:
        return '已断开';
      case BleConnectionState.connecting:
        return '连接中';
      case BleConnectionState.connected:
        return '已连接';
      case BleConnectionState.disconnecting:
        return '断开中';
      case BleConnectionState.error:
        return '连接错误';
      default:
        return '未知状态($state)';
    }
  }
  
  /// 更新连接状态
  Future<void> _updateConnectionState() async {
    connectionState.value = await _bleService.getConnectionState();
    isConnected.value = connectionState.value == BleConnectionState.connected;
    
    if (isConnected.value) {
      connectedDeviceAddress.value = await _bleService.getConnectedDeviceAddress() ?? '';
      batteryLevel.value = await _bleService.getBatteryLevel();
      firmwareVersion.value = await _bleService.getFirmwareVersion() ?? '';
    }
  }
  
  /// 开始扫描设备
  Future<void> startScan() async {
    try {
      // 清空设备列表
      deviceList.clear();
      
      // 设置扫描状态
      isScanning.value = true;
      statusMessage.value = '开始扫描...';
      
      // 开始扫描
      final result = await _bleService.startScan(timeout: 15000);
      
      if (!result) {
        statusMessage.value = '扫描失败';
        Get.snackbar('扫描失败', '无法启动BLE扫描',
            snackPosition: SnackPosition.BOTTOM);
      }
    } catch (e) {
      statusMessage.value = '扫描异常: $e';
      Get.snackbar('扫描错误', '扫描过程中出错: $e',
          snackPosition: SnackPosition.BOTTOM);
    } finally {
      // 5秒后自动停止扫描
      Future.delayed(const Duration(seconds: 15), () {
        if (isScanning.value) {
          stopScan();
        }
      });
    }
  }
  
  /// 停止扫描设备
  Future<void> stopScan() async {
    try {
      await _bleService.stopScan();
      isScanning.value = false;
      statusMessage.value = '扫描已停止';
    } catch (e) {
      statusMessage.value = '停止扫描异常: $e';
      Get.snackbar('停止扫描失败', '无法停止BLE扫描: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 连接到设备
  Future<void> connectToDevice(String address) async {
    try {
      statusMessage.value = '正在连接到 $address...';
      
      final result = await _bleService.connect(address);
      
      if (!result) {
        statusMessage.value = '连接失败';
        Get.snackbar('连接失败', '无法连接到设备',
            snackPosition: SnackPosition.BOTTOM);
      } else {
        connectedDeviceAddress.value = address;
        statusMessage.value = '连接成功，正在获取设备信息...';
        
        // 获取设备信息
        await _bleService.getDeviceVersion();
        await _bleService.getBatteryInfo();
      }
    } catch (e) {
      statusMessage.value = '连接异常: $e';
      Get.snackbar('连接错误', '连接过程中出错: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 断开设备连接
  Future<void> disconnect() async {
    try {
      statusMessage.value = '正在断开连接...';
      
      await _bleService.disconnect();
      
      connectedDeviceAddress.value = '';
      isConnected.value = false;
      
      statusMessage.value = '已断开连接';
    } catch (e) {
      statusMessage.value = '断开连接异常: $e';
      Get.snackbar('断开连接失败', '无法断开设备连接: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 获取设备版本信息
  Future<void> getDeviceVersion() async {
    try {
      statusMessage.value = '正在获取设备版本...';
      
      await _bleService.getDeviceVersion();
      
      statusMessage.value = '版本获取命令已发送';
    } catch (e) {
      statusMessage.value = '获取版本异常: $e';
      Get.snackbar('获取版本失败', '无法获取设备版本: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 获取电池信息
  Future<void> getBatteryInfo() async {
    try {
      statusMessage.value = '正在获取电池信息...';
      
      await _bleService.getBatteryInfo();
      
      statusMessage.value = '电池信息获取命令已发送';
    } catch (e) {
      statusMessage.value = '获取电池信息异常: $e';
      Get.snackbar('获取电池信息失败', '无法获取电池信息: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 打开编码器
  Future<void> openEncoder() async {
    try {
      statusMessage.value = '正在打开编码器...';
      
      await _bleService.openEncoder();
      
      statusMessage.value = '编码器打开命令已发送';
    } catch (e) {
      statusMessage.value = '打开编码器异常: $e';
      Get.snackbar('操作失败', '无法打开编码器: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 打开解码器
  Future<void> openDecoder() async {
    try {
      statusMessage.value = '正在打开解码器...';
      
      await _bleService.openDecoder();
      
      statusMessage.value = '解码器打开命令已发送';
    } catch (e) {
      statusMessage.value = '打开解码器异常: $e';
      Get.snackbar('操作失败', '无法打开解码器: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 关闭编解码器
  Future<void> closeCodec() async {
    try {
      statusMessage.value = '正在关闭编解码器...';
      
      await _bleService.closeCodec();
      
      statusMessage.value = '编解码器关闭命令已发送';
    } catch (e) {
      statusMessage.value = '关闭编解码器异常: $e';
      Get.snackbar('操作失败', '无法关闭编解码器: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 播放A2DP
  Future<void> playA2DP() async {
    try {
      statusMessage.value = '正在播放A2DP...';
      
      await _bleService.playA2DP();
      
      statusMessage.value = 'A2DP播放命令已发送';
    } catch (e) {
      statusMessage.value = '播放A2DP异常: $e';
      Get.snackbar('操作失败', '无法播放A2DP: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 音量增加
  Future<void> volumeUp() async {
    try {
      statusMessage.value = '正在增加音量...';
      
      await _bleService.volumeUp();
      
      statusMessage.value = '音量增加命令已发送';
    } catch (e) {
      statusMessage.value = '增加音量异常: $e';
      Get.snackbar('操作失败', '无法增加音量: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 音量减小
  Future<void> volumeDown() async {
    try {
      statusMessage.value = '正在减小音量...';
      
      await _bleService.volumeDown();
      
      statusMessage.value = '音量减小命令已发送';
    } catch (e) {
      statusMessage.value = '减小音量异常: $e';
      Get.snackbar('操作失败', '无法减小音量: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 发送音频数据
  Future<void> sendAudioData(Uint8List data) async {
    try {
      statusMessage.value = '正在发送音频数据...';
      
      await _bleService.sendAudioData(data);
      
      statusMessage.value = '音频数据发送成功: ${data.length} 字节';
    } catch (e) {
      statusMessage.value = '发送音频数据异常: $e';
      Get.snackbar('发送失败', '无法发送音频数据: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  /// 清理资源
  Future<void> cleanup() async {
    try {
      await _bleService.cleanup();
    } catch (e) {
      Get.snackbar('清理失败', '无法清理BLE资源: $e',
          snackPosition: SnackPosition.BOTTOM);
    }
  }
  
  @override
  void onClose() {
    // 取消所有订阅
    _scanSubscription.cancel();
    _connectionSubscription.cancel();
    _dataSubscription.cancel();
    _statusSubscription.cancel();
    
    // 停止扫描
    if (isScanning.value) {
      stopScan();
    }
    
    // 断开连接
    if (isConnected.value) {
      disconnect();
    }
    
    // 清理资源
    cleanup();
    
    super.onClose();
  }
}