using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text.RegularExpressions;

namespace EC.Utils.SerialPortHelper
{
	/// <summary>
	/// 返回数据类型
	/// </summary>
	public enum ReturnDateType
	{
		/// <summary>
		/// 返回byte[]
		/// </summary>
		Bytes = 0,

		HexStr = 1,

		Str = 2,
	}

	/// <summary>
	/// EC 串口类
	/// </summary>
	public class ECSerialPort
	{
		private SerialPort comm = new SerialPort();//声明一个串口
		private SerialCustomer serialCustomer = null;
		private bool openFlag = false;// 是否打开成功

		public long ReceivedCount { get; set; }//接收计数

		public long RendCount { get; set; }//发送计数

		public ECSerialPort(SerialCustomer serialCustomer)
		{
			this.serialCustomer = serialCustomer;
		}

		public bool OpenCom()
		{
			//根据当前串口对象，来判断操作
			if (comm.IsOpen)
			{
				//打开时点击，则关闭串口
				comm.Close();
				openFlag = false;
			}
			else
			{
				if (serialCustomer.ComName == "")
				{
					throw new Exception("请插入串口设备！");
				}
				//关闭时点击，则设置好端口，波特率后打开
				//获得串口端口信息为:  COM1:通讯端口

				comm.PortName = serialCustomer.ComName;
				comm.BaudRate = serialCustomer.BaudRate;// int.Parse(comboBaudrate.Text);//波特率
				comm.DataBits = serialCustomer.DataBits;//数据位
				comm.Parity = (Parity)serialCustomer.Parity;//奇偶校验0-4=no,odd,even,mark,space
				comm.StopBits = (StopBits)Convert.ToInt32(serialCustomer.StopBits);//停止位
				comm.ReadTimeout = 2000;//写超时
				comm.WriteTimeout = 500;//读超时
										//comm.WriteBufferSize = 1024;
										//comm.ReadBufferSize = 1024;
				comm.ReceivedBytesThreshold = serialCustomer.ReceivedBytesThreshold;//128Btye时触发一次事件，设置为1时易造成线程死锁。
				comm.RtsEnable = true;
				comm.DtrEnable = true;
				//comm.Handshake = Handshake.None;
				//添加事件注册
				comm.DataReceived += new SerialDataReceivedEventHandler(Comm_DataReceived);
				comm.Open();
			}
			openFlag = comm.IsOpen ? true : false;
			return openFlag;
		}

		/// <summary>
		/// 关闭串口
		/// </summary>
		public void CloseCom()
		{
			comm.Close();
			openFlag = false;
		}

		public bool IsOpen()
		{
			return comm.IsOpen;
		}

		public event EventHandler<byte[]> OnRecData; //定义一个委托类型的事件

		private void Comm_DataReceived(object sender, EventArgs e)
		{
			int n = comm.BytesToRead;//获取缓存区字节数
			byte[] buf = new byte[n];//存储串口数据用
			ReceivedCount += n;//接收计数
			comm.Read(buf, 0, n);//读取缓冲数据

			//OnRecData?.BeginInvoke(this, buf, null, null);
			OnRecData?.Invoke(this, buf);
		}

		/// <summary>
		/// 发送串口
		/// </summary>
		/// <param name="checkBoxHexSend"></param>
		/// <param name="sendtext"></param>
		/// <param name="newLine"></param>
		public void Send(bool checkBoxHexSend, string sendtext, bool newLine = false)
		{
			//定义一个变量，记录发送了几个字节
			int n = 0;
			//16进制发送
			if (checkBoxHexSend)
			{
				//正则得到有效的十六进制数(?i)对大小写不敏感，[/da-f]，{2}连续出现2次
				// MatchCollection mc = Regex.Matches(txSend.Text, @"(?i)[/da-f]{2}");
				MatchCollection mc = Regex.Matches(sendtext, @"(?i)[\da-f]{2}");
				List<byte> buf = new List<byte>();//填充到这个临时列表中
												  //依次添加到列表中
				foreach (Match m in mc)
				{
					buf.Add(byte.Parse(m.Value, System.Globalization.NumberStyles.HexNumber));
				}
				//转换列表为数组后发送
				comm.Write(buf.ToArray(), 0, buf.Count);
				if (newLine == true)
				{ //记录发送的字节数
					comm.WriteLine("\r\n");
					n = buf.Count + 2;
				}
				else
					n = buf.Count;
			}
			else//ascii编码直接发送
			{
				if (newLine == true)
				{
					comm.Write(sendtext + "\r\n");
					n = sendtext.Length + 2;
				}
				else//不包含换行符
				{
					comm.Write(sendtext);
					n = sendtext.Length;
				}
			}
			RendCount += n;//累加发送字节数
		}

		/// <summary>
		/// 16进制发送
		/// </summary>
		/// <param name="buf"></param>
		/// <param name="newline"></param>
		public void SendHex(byte[] buf, bool newline = false)
		{
			//定义一个变量，记录发送了几个字节
			int n = 0;

			int bufLen = buf.Count();
			comm.Write(buf, 0, bufLen);
			//if (newline == true)
			//{ //记录发送的字节数
			//comm.WriteLine("\n");
			//n = bufLen + 2;
			//}
			//else
			//    n = bufLen;

			RendCount += n;//累加发送字节数
		}

		public void DiscardInBuffer()
		{
			comm.DiscardInBuffer();
		}
	}
}