using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO.Ports;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
using SerialPort = System.IO.Ports.SerialPort;

namespace ZWGXPICK_SYS.SerialPort
{
    /// <summary>
    /// 串口通讯工具
    /// </summary>
    public class SerialPortUtils
    {

        private System.IO.Ports.SerialPort SerialPort;

        /// <summary>
        /// 串口名称
        /// </summary>
        public string ComName { get; set; }
        /// <summary>
        /// 波特率
        /// </summary>
        public int ComBaud { get;  set; }
        /// <summary>
        /// 数据位
        /// </summary>
        public int DataBits { get; private set; }

        /// <summary>
        /// 接收数据长度
        /// </summary>
        public int ReceivedBytesThreshold { get; set; }
        /// <summary>
        /// 停止位
        /// </summary>
        public StopBits StopBits { get; private set; }
        /// <summary>
        /// 校验位
        /// </summary>
        public Parity Parity { get; private set; }

        public event EventHandler<byte[]> SerialDataReceived;

        public event EventHandler<MessageEventArgs> SerialMessage;

        #region builder
        private SerialPortUtils(SerialPortUtilsBuilder builder)
        {
            ComName = builder.comName;
            ComBaud = builder.comBaud;
            DataBits = builder.dataBits;
            StopBits = builder.stopBits;
            Parity = builder.parity;
            ReceivedBytesThreshold = builder.receivedBytesThreshold;
        }

        public static SerialPortUtilsBuilder Builder(string comName)
        {
            return new SerialPortUtilsBuilder(comName);
        }
        public class SerialPortUtilsBuilder
        {

            internal string comName;

            internal int comBaud = 9600;

            internal int dataBits = 8;

            internal StopBits stopBits = System.IO.Ports.StopBits.One;

            internal int receivedBytesThreshold = 1;

            public Parity parity = Parity.None;

            public SerialPortUtilsBuilder(string comName)
            {
                this.comName = comName;
            }

            public SerialPortUtilsBuilder ComBaud(int comBaud)
            {
                this.comBaud = comBaud;
                return this;
            }
            public SerialPortUtilsBuilder DataBits(int dataBits)
            {
                this.dataBits = dataBits;
                return this;
            }
            public SerialPortUtilsBuilder StopBits(StopBits stopBits)
            {
                this.stopBits = stopBits;
                return this;
            }
            public SerialPortUtilsBuilder StopBits(Parity parity)
            {
                this.parity = parity;
                return this;
            }
            public SerialPortUtilsBuilder ReceivedBytesThreshold(int receivedBytesThreshold)
            {
                this.receivedBytesThreshold = receivedBytesThreshold;
                return this;
            }

            public SerialPortUtils Build()
            {
                return new SerialPortUtils(this);
            }
        }

        #endregion builder

        /// <summary>
        /// 获取当前电脑的串口列表
        /// </summary>
        /// <returns></returns>
        public static string[] GetPortNames()
        {
            return System.IO.Ports.SerialPort.GetPortNames();
        }

        public bool Open()
        {
            try
            {
                if (SerialPort == null)
                {
                    SerialPort = new System.IO.Ports.SerialPort();
                    //串口数据接收事件实现
                    SerialPort.DataReceived += new SerialDataReceivedEventHandler(ReceiveData);
                }
                if (!SerialPort.IsOpen)
                {
                    SerialPort.PortName = ComName;
                    SerialPort.BaudRate = ComBaud;
                    SerialPort.DataBits = DataBits;
                    SerialPort.StopBits = StopBits;
                    SerialPort.Parity = Parity;
                    SerialPort.ReceivedBytesThreshold = ReceivedBytesThreshold;
                    SerialPort.Open();
                }
                return true;
            }
            catch (Exception ex)
            {
                PrintMessage(true, $"打开串口连接异常：", ex);
            }

            return false;

        }

        public void Close()
        {
            try
            {
                if (SerialPort.IsOpen)
                {
                    SerialPort.Close();

                    PrintMessage(true, $"关闭串口连接：");
                }
            }
            catch (Exception ex)
            {
                PrintMessage(true, $"关闭串口连接异常：", ex);
            }

        }

        public bool IsOpen
        {
            get
            {
                if (SerialPort == null)
                {
                    return false;
                }
                return SerialPort.IsOpen;
            }
        }

        public void ReceiveData(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                System.IO.Ports.SerialPort _SerialPort = sender as System.IO.Ports.SerialPort;

                int _bytesToRead = _SerialPort.BytesToRead;
                byte[] recvData = new byte[_bytesToRead];

                _SerialPort.Read(recvData, 0, _bytesToRead);

                SerialDataReceived?.Invoke(this, recvData);

                PrintMessage(false, $"接收到数据【{e.EventType}】：" + BitConverter.ToString(recvData));

            }
            catch (Exception ex)
            {
                PrintMessage(true, $"接收数据异常：", ex);
            }

        }

        public bool SendData(byte[] data)
        {
            try
            {

                if (SerialPort == null || !SerialPort.IsOpen)
                {
                    Open();
                }
                if (!SerialPort.IsOpen)
                {
                    PrintMessage(true, $"发送数据异常,串口连接没有正常打开");
                    return false;
                }

                SerialPort.Write(data, 0, data.Length);

                PrintMessage(false, $"发送数据：" + BitConverter.ToString(data));
                return true;
            }
            catch (Exception ex)
            {
                PrintMessage(true, $"发送数据异常：", ex);
                return false;
            }
        }

        //触发消息事件
        private void PrintMessage(bool isError, string title, Exception ex = null)
        {
            string info = $"端口{ComName},波特率{ComBaud},{title}{(ex == null ? "" : "")}{ex?.Message}";

            SerialMessage?.Invoke(this, new MessageEventArgs(isError: isError, message: info));
        }
    }
}