import 'dart:async';
import 'dart:convert';
import 'dart:ffi';
import 'dart:io';
import 'dart:typed_data';

import 'package:common/utils/toast_utils.dart';
import 'package:web_synchronization_tool/windows/little_extension.dart';
import 'package:web_synchronization_tool/windows/socket_tool.dart';

import '../windows/code.dart';

class LoginSocketUtils extends LoginSocket {

  // 私有构造函数
  LoginSocketUtils._();
  // 私有静态变量，保存类的唯一实例
  static LoginSocketUtils? _instance;

  // 公开的静态方法，返回类的唯一实例
  static LoginSocketUtils getInstance() {
    _instance ??= LoginSocketUtils._();
    return _instance!;
  }

}


typedef loginBlockFun = Function(Map);


class LoginSocket{

  String url = '192.168.200.17';
  // static int port = 12341;
  static int port = 37785;

  String uuid = '';

  Socket? socket;

  int heartTime = 0;


  connect() async {

    socket = await Socket.connect(url, port, timeout: const Duration(seconds: 30));

    socket?.listen((event) {

      Map data = dataCute(event);

      // 登录结果
      if (data['op'] == 2){
        loginBlock(data);
      }

      // 服务器心跳
      if (data['op'] == 4){
        try{
          int time = data['time'];
          time = DateTime.now().millisecondsSinceEpoch - time;
          if(time> (3 * 60 * 1000) ){ // 时间戳 > 3分钟
            socketError();
          }
        }catch(e){
          socketError();
        }
      }

    },onDone: (){
    },onError: (error){
      // 连接断开
      socketError();
      socket?.destroy();
    });

  }


  socketError(){
    /// 任何错误都显示这个
    ToastUtils.showLoading(msg: '重连中');
    /// 关闭同步 socket
    SocketUtils.getInstance().socket?.close();
  }


  late loginBlockFun loginBlock;

  // 登录
  login(String account,String passwoord,loginBlockFun blockFun){

    loginBlock = blockFun;

    Map map = {
      'op':1,
      'account':account,
      'password':passwoord,
      'uuid':uuid
    };

    final dd = dataMake(map);
    socket?.add(dd);
    socket?.flush();
  }

  /// 心跳
  heartbeat(){
    DateTime now = DateTime.now();
    int timestamp = now.millisecondsSinceEpoch; // 秒
    heartTime = timestamp;

    Timer(const Duration(seconds: 20), () async {

      if (socket == null){
        // 重连
        await connect();
      }

      Map map =   {
        "op": 3,
      };

      socket?.add(dataMake(map));
      socket?.flush();

      heartbeat();

    });
  }


  /// 发送数据的处理
  List<int> dataMake(Map map){


    // 将Map对象转换为JSON字符串
    String json = jsonEncode(map);
    // 加密
    String ps = makecode(json, skey);

    List<int> bytes = ps.codeUnits; // 将字符串转换为字节数组

    return bytes.toLittle();
  }

  /// 接收数据处理
  Map dataCute(Uint8List data){

    if (data.length <= 4) return {};

    Uint8List pData = data.sublist(4,data.length);

    String str = cutecode(pData);

    Map map = json.decode(str);

    return map;
  }


}