import 'dart:async';

import 'package:flutter_easyloading/flutter_easyloading.dart';
import 'package:flutter_reactive_ble/flutter_reactive_ble.dart';

import 'io_tool/io_model.dart';
import 'io_tool/io_tool.dart';
import 'io_tool/manager_event_bus.dart';
import 'reciver_data.dart';

//连接状态回调
typedef ConnectStateCallBack = Function(DeviceConnectionState connectionState);

class BlueManage{
  FlutterReactiveBle? _flutterReactiveBle;
  final List<DiscoveredDevice> scanDevices = [];

  // 用来写入的服务id
  Uuid serviceIdConnect = Uuid.parse("fff0");
  // 用来写入的服务id
  Uuid serviceIdWrite = Uuid.parse('0000FFF0-0000-1000-8000-00805F9B34FB');
  // 用来订阅的特征id
  Uuid characteristicIdSubscription = Uuid.parse("fff1");
  // 用来写入的特征id
  Uuid characteristicIdWrite = Uuid.parse("fff2");

  // 发送监听发送事件
  StreamSubscription<EventSendModel>? _sendStreamSubscription;
  // 监听蓝牙扫描的事件
  StreamSubscription? _scanSubscription;
  // 监听蓝牙连接的事件
  StreamSubscription<dynamic>? _currentConnectionStream;

  // 当前连接设备的名字
  String connectDeviceName = "";
  // 当前连接设备的mac地址
  String connectDeviceMacAddress = "";
  // 监听蓝牙连接状态
  DeviceConnectionState? deviceConnectionState = DeviceConnectionState.disconnected;

  static BlueManage? _manager;
  BlueManage._init();

  static BlueManage? shareManager(){
    _manager ??=  BlueManage._init();
    _manager!._initBlue();
    return _manager;
  }

  factory BlueManage() => shareManager()!;
  BlueManage? get manager => shareManager();

  void _initBlue(){
    // print("蓝牙功能初始化了");
    _flutterReactiveBle ??= FlutterReactiveBle();
    _initSendStreamSubscription();
  }

  void _initSendStreamSubscription() {
    _sendStreamSubscription ??= EventBusManager().eventBus!.on<EventSendModel>().listen((
          EventSendModel model) {
        if (model.sendChannel == DataChannel.ble) {
          // managerAppWriteData(model.data);
          writeCharacteristicWithResponse(model.data);
        }
      });
  }

  /// 开始扫描蓝牙设备
  void startScan({List<Uuid>? idList}) {
    scanDevices.clear();
    _scanSubscription = _flutterReactiveBle!.scanForDevices(withServices: idList??[]).listen((device) {
      // 判断名字为空的直接剔除
      if(device.name.isEmpty){
        return;
      }
      // print("startScanDevice:$device");
      if (((device.serviceUuids.isNotEmpty ? device.serviceUuids[0] : "").toString().contains("758824")) && (device.rssi >= -100)) {
        // 查询id相同的元素
        final knownDeviceIndex = scanDevices.indexWhere((d) => d.id == device.id);
        // 不存在的时候返回-1
        if (knownDeviceIndex >= 0) {
          scanDevices[knownDeviceIndex] = device;
        } else {
          scanDevices.add(device);
        }
        EventBusManager().eventBusFir(scanDevices);
      }
    }, onError: (Object e) {
      print('Device scan fails with error: $e');
    });
  }

  /// 调用连接
  Future<void> judgeReconnect(String deviceName, ConnectStateCallBack stateCallBack) async {
    if(deviceConnectionState != DeviceConnectionState.connected){
      _connect(deviceName, (state){
        stateCallBack(deviceConnectionState!);
      });
    }else{
      stateCallBack(deviceConnectionState!);
    }
  }

  /// 连接监听状态
  Future<void> _connect(String deviceName, ConnectStateCallBack connectStateCallBack) async {
    connectDeviceName = deviceName;
    // 判断数组列表里面是否有这个设备
    final knownDeviceIndex = scanDevices.indexWhere((d) => d.name == deviceName);

    if (knownDeviceIndex >= 0) {
      // 存在的时候赋值
      connectDeviceMacAddress = scanDevices[knownDeviceIndex].id;
    } else {
      // 不存在的时候返回-1 然后循环5秒
      var index = 0;
      Completer? completer = Completer();
      Timer.periodic(const Duration(milliseconds: 1000), (timer) {
        ///定时任务
        // print("timer index0:$index");
        if(index >= 5){
          // 当超过5秒的时候取消定时任务 弹窗显示连接失败
          completer.complete();
          timer.cancel();
          connectDeviceMacAddress = "";
          // deviceConnectionState = DeviceConnectionState.disconnected;
          // print("timer index1:$index");
          connectStateCallBack(DeviceConnectionState.disconnected);
        }else{
          // 每秒判断数组列表里面是否有这个设备
          final knownDeviceIndex = scanDevices.indexWhere((d) => d.name == deviceName);
          if (knownDeviceIndex >= 0) {
            // 存在的时候销毁定时器，赋值
            completer.complete();
            timer.cancel();
            // print("timer index2:$index");
            connectDeviceMacAddress = scanDevices[knownDeviceIndex].id;
          } else {
            // 不存在的时候返回-1 然后循环5秒
            index++;
            print("index:$index 没有找到设备");
          }
        }
      });
      // 等待Completer完成
      await completer.future;
    }
    print("connectDeviceId:$connectDeviceMacAddress  connectDeviceName:$connectDeviceName");

    if(connectDeviceMacAddress.isEmpty){
      return;
    }

    _currentConnectionStream = _flutterReactiveBle!.connectToDevice(id: connectDeviceMacAddress, connectionTimeout: const Duration(seconds: 10)).listen((connectionStateUpdate) async {
      // 获取状态
      deviceConnectionState = connectionStateUpdate.connectionState;
      print('deviceConnectionState:$deviceConnectionState connectionStateUpdate.connectionState:${connectionStateUpdate.connectionState}');
      if(connectionStateUpdate.connectionState == DeviceConnectionState.connected){
        // 如果状态是连接的开始发现服务
        try {
          _subScribeToCharacteristic(QualifiedCharacteristic(characteristicId: characteristicIdSubscription, serviceId: serviceIdConnect, deviceId: connectDeviceMacAddress));
          print('Discovering services finished');

          // if(isFrist == true){
          //   // 第一次添加锁的时候需要先获取公钥
          //   IoSenderManage.getPublicKey(lockId: deviceName);
          // }
          deviceConnectionState = connectionStateUpdate.connectionState;
          connectStateCallBack(deviceConnectionState!);
        } on Exception catch (e) {
          deviceConnectionState = DeviceConnectionState.disconnected;
          connectStateCallBack(deviceConnectionState!);
          print('Error occurred when discovering services: $e');
          rethrow;
        }
      } else{
        deviceConnectionState = connectionStateUpdate.connectionState;
        connectStateCallBack(deviceConnectionState!);
      }
      print('ConnectionState for device $connectDeviceMacAddress : ${connectionStateUpdate.connectionState}');
    }, onError: (Object e){
      deviceConnectionState = DeviceConnectionState.disconnected;
      connectStateCallBack(deviceConnectionState!);
      print('Connecting to device $connectDeviceMacAddress resulted in error $e');
    }
    );
  }

  // 听上报来的数据,参数来自前面扫描到的结果
  var allData = <int>[];
  _subScribeToCharacteristic(QualifiedCharacteristic characteristic) {
    _flutterReactiveBle!.subscribeToCharacteristic(characteristic).listen((data) {
      // code to handle incoming data
      print("subscribeToCharacteristic: deviceId = ${characteristic.deviceId} characteristicId =${characteristic.characteristicId}---上报来的数据data = $data");
      var dataLen = 0;// 高16位用来指示后面数据块内容的长度

      if((data[0] == 0xEF)&&(data[1] == 0x01)&&(data[2] == 0xEE)&&(data[3] == 0x02)){
        // 当包有头时
        // 判断是否需要分包
        dataLen = data[8] * 256 + data[9];
        // print("dataLen1111:$dataLen getDataLength:${data.length}");
        if(dataLen + 12 > data.length){
          // 当前包的长度小于实际的包时 分包添加 不解析
          allData.addAll(data);
        }else{
          // 当前包的长度小于实际的包时 不分包 解析
          allData.addAll(data);
          CommandReciverManager.appDataReceive(allData);
          // 发送完解析初始化数组
          allData = <int>[];
        }
      }else{
        // 当包没有头时 是分包的包 直接添加
        allData.addAll(data);
        // var len = allData[8] * 256 + allData[9];
        // print("dataLen222:$dataLen");
        if(dataLen <= (allData.length - 14)){
          // 当长度小于等于当前包的数据时 直接解析数据
          CommandReciverManager.appDataReceive(allData);
          // 发送完解析初始化数组
          allData = <int>[];
        }
      }
    }, onError: (dynamic error) {
      EasyLoading.dismiss();
      print("subscribeToCharacteristic error:$error");
    });
  }

  // 写入
  Future<void> writeCharacteristicWithResponse(List<int> value) async {
    QualifiedCharacteristic characteristic = QualifiedCharacteristic(characteristicId: characteristicIdWrite, serviceId: serviceIdWrite, deviceId: connectDeviceMacAddress);
    int mtuLength = await _flutterReactiveBle!.requestMtu(deviceId: characteristic.deviceId, mtu: 250);
    print("mtuLength:$mtuLength");
    try {
      List<int> valueList = value;
      List subData = splitList(valueList, mtuLength);
      print('得到的分割数据:$subData');

      for (int i = 0; i < subData.length; i++) {
        await _flutterReactiveBle!.writeCharacteristicWithResponse(characteristic, value: subData[i]).then((value) async {
          await Future.delayed(const Duration(milliseconds: 1))
              .then((value) async {
            print('分包发送成功了');
          });
        });
      }
    } on Exception catch (e, s) {
      print('Error occurred when writing: $e');
      // ignore: avoid_print
      print(s);
      rethrow;
    }
  }

  // 读取
  Future<List<int>> _readCharacteristic(QualifiedCharacteristic characteristic) async {
    try {
      final result = await _flutterReactiveBle!.readCharacteristic(characteristic);
      print("readListresult$result");
      return result;
    } on Exception catch (e, s) {
      print('Error occurred when reading ${characteristic.characteristicId} : $e',);
      rethrow;
    }
  }

  Future<void> writeCharacteristicWithoutResponse(
      QualifiedCharacteristic characteristic, List<int> value) async {
    try {
      await _flutterReactiveBle!.writeCharacteristicWithoutResponse(characteristic,
          value: value);
    } on Exception catch (e, s) {
      // ignore: avoid_print
      print(s);
      rethrow;
    }
  }

  // 停止扫描蓝牙设备
  // Future<void> stopScan() async {
    // await _scanSubscription?.cancel();
    // _scanSubscription = null;
  // }

  // 断开连接
  Future<void> disconnect(String deviceMAC) async {
    try {
      _currentConnectionStream?.cancel();
      print('disconnecting to device: $deviceMAC');
    } on Exception catch (e, _) {
      print("Error disconnecting from a device: $e");
    } finally {
      deviceConnectionState = DeviceConnectionState.disconnected;
    }
  }

  disposed(){
    _sendStreamSubscription?.cancel();
    _currentConnectionStream?.cancel();
    _scanSubscription?.cancel();
  }
}