import 'dart:async';
import 'dart:io';

import 'package:star_lock/talk/udp/udp_reciverData.dart';

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

class UDPManage{
  static UDPManage? _manager;

  UDPManage._init() {
    initUdp();
    _streamSubscription = EventBusManager().eventBus!.on<EventSendModel>().listen((EventSendModel sendModel) {
      // print("sendModel.sendChannel:${sendModel.sendChannel}");
      if(sendModel.sendChannel == DataChannel.udp){
        List<int> data = sendModel.data;
        sendData(data);
      }
    });
  }

  static UDPManage _share(){
    _manager ??= UDPManage._init();
    return _manager!;
  }
  factory UDPManage() => _share();
  UDPManage get manager => _share();

  StreamSubscription<EventSendModel>? _streamSubscription;
  RawDatagramSocket? _udpSocket;
  // String host = '47.106.143.213';
  // int port = 8056;
  // String? _mIp = '';
  String host = '';
  int port = 0;
  String lockId = '';// 锁id 通过锁id来判断是哪把锁发对讲过来

  void initUdp() async {
    var listAddress = InternetAddress.lookup(host!);
    listAddress.then((list) {
      list.forEach((element) {
        // print('Udp ----> element.address:${element.address} element.host:${element.host}');
        host = element.address;
      });
    });
    await _initUdp();
  }

  Future<Null> _initUdp() async {
    if(port == 0){
      print('❌ Udp ----> _port == 0');
      return;
    }
    print('Udp ----> host:$host port:$port');
    var addressIListenFrom = InternetAddress.anyIPv4;
    int portIListenOn = 62288;
    RawDatagramSocket.bind(addressIListenFrom, portIListenOn).then((RawDatagramSocket socket){
      _udpSocket = socket;
      ///广播功能
      _udpSocket!.broadcastEnabled = true;
      _onReceiveData(socket);
    });
  }


  void _onReceiveData(RawDatagramSocket socket) {
    socket.listen((RawSocketEvent event) {
      if(event == RawSocketEvent.read){
        Datagram? dg = socket.receive();
        try {
          // print('Did received data on the stream (length --> ${dg!.data.length}) dg!.data:${dg!.data}');
          // EventBusManager().eventBusFir(EventReceiveModel(data: dg?.data,sendChannel: DataChannel.udp));
          CommandUDPReciverManager.appDataReceive(dg!.data);
        } catch (e) {
          print('❌ Udp ----> $e');
        }
      }
    });
  }

  void sendData(List<int> data) {
    if(null == _udpSocket || null == data || data.isEmpty || host == ''){
      if(null == _udpSocket ){
        print('❌ Udp ----> null == _udpSocket');
        initUdp();
      }
      return;
    }
    try {
      // print("sendData:$data");
      var result = _udpSocket?.send(data, InternetAddress(host!), port!);
      if(result != data.length) {
        print('❌Udp ---->   send data $result ${data.length}');
        _udpSocket = null;
      }
    }catch (e){

    }
  }

  bool exit() {
    if(null != _udpSocket) {
      print('❌ Udp ----> close');
      _udpSocket?.close();
    }
    return true;
  }


  void disposed() {
    _streamSubscription?.cancel();
  }

}