using System;
using System.IO.Ports;
using System.Linq;
using System.Threading;

namespace SlnMesnac.RfidUpload.Business
{
    /// <summary>
    /// 串口通讯类
    /// </summary>
    public class SerialPortBusiness
    {

        #region 单例实现
        private static readonly Lazy<SerialPortBusiness> _lazy = new Lazy<SerialPortBusiness>(() => new SerialPortBusiness());

        public static SerialPortBusiness Instance
        {
            get
            {
                return _lazy.Value;
            }
        }
        #endregion

        #region 委托事件

        /// <summary>
        /// 刷新标签解析
        /// </summary>
        public delegate void ReceivedData(byte[] buffer);
        public event ReceivedData ReceivedDataEvent;

        /// <summary>
        /// 刷新日志内容
        /// </summary>
        public delegate void RefreshLogMessage(string message);
        public event RefreshLogMessage RefreshLogMessageEvent;

        #endregion

        private SerialPort _serialPort;

        private SerialPortBusiness()
        {

        }

        /// <summary>
        /// 打开串口
        /// </summary>
        public void Open()
        {
            string port = System.IO.Ports.SerialPort.GetPortNames().FirstOrDefault();
            _serialPort = new SerialPort(port, 115200, Parity.None, 8, StopBits.One);
            _serialPort.DataReceived += SerialPortDataReceived;

            _serialPort.Open();
        }

        /// <summary>
        /// 关闭串口
        /// </summary>
        public void Close()
        {
            if (_serialPort != null)
            {
                _serialPort.Close();
            }
            else
            {
                throw new ArgumentException("_serialPort == null");
            }
        }

        /// <summary>
        /// 接收数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SerialPortDataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                Thread.Sleep(200);
                int bytesToRead = _serialPort.BytesToRead;
                byte[] buffer = new byte[bytesToRead];

                _serialPort.Read(buffer, 0, bytesToRead);

                RefreshLogMessageEvent?.Invoke("Received data: " + BitConverter.ToString(buffer).Replace("-", " "));

                if (CheckReceivedData(buffer))
                {
                    ReceivedDataEvent?.Invoke(buffer);
                }
                else
                {
                    RefreshLogMessageEvent?.Invoke("心跳指令不进行逻辑处理");
                }
            }
            catch (Exception ex)
            {
                RefreshLogMessageEvent?.Invoke($"接收数据异常:{ex.Message}");
            }
        }

        /// <summary>
        /// 判断是否为业务数据
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        private bool CheckReceivedData(byte[] data)
        {

            if (data.Length > 4)
            {
                return true;
            }

            return false;
        }
    }
}