using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO.Ports;

namespace KHSCALE_TP
{
    public class SerialBase
    {
        protected object m_lock = new object();
        protected float m_value = 0;
        protected Thread m_t1 = null;
        protected bool m_bThreadRun = true;
        protected int m_recvCount = 0;
        protected DateTime m_dtRecv = DateTime.Now;

        protected string m_portName = "COM1";
        protected int m_baudRate = 9600;
        protected int m_parity = 0;
        protected int m_dataBits = 8;
        protected float m_stopBits = 1;

        public string GetComSetting()
        {
            return m_portName + "," + m_baudRate.ToString() + "," + m_parity.ToString() + "," + m_dataBits.ToString() + "," + m_stopBits.ToString();
        }

        // 통신 프레임 사이즈가 고정일 경우 그 사이즈를 지정. 정해진 사이즈가 없으면 -1 리턴하고, 구분자로 프레임 구분하도록
        protected virtual int GetFrameSize()
        {
            return -1;
        }

        // 통신 프레임 간의 구분자가 있을 경우 그 구분자를 지정
        protected virtual char GetFrameDelimiter()
        {
            return '\n';
        }

        protected virtual bool Parse(List<byte> buffRecv)
        {
            return false;
        }

        public float GetValue()
        {
            lock (m_lock)
            {
                return m_value;
            }
        }

        protected void SetValue(float val)
        {
            lock (m_lock)
            {
                m_value = val;
                m_dtRecv = DateTime.Now;
            }
        }

        public float GetRecvCount()
        {
            lock (m_lock)
            {
                return m_recvCount;
            }
        }

        public DateTime GetUpdTime()
        {
            lock (m_lock)
            {
                return m_dtRecv;
            }
        }

        // portName: COM1, COM2, ....
        // baudRate: 9600, 19200, ...
        // parity: 0=None, 1=Odd, 2=Even
        // dataBits: 7, 8, ...
        // stopBits: 1, 1.5, 2
        public void Init(string portName, int baudRate, int parity, int dataBits, float stopBits)
        {
            m_portName = portName;
            m_baudRate = baudRate;
            m_parity = parity;
            m_dataBits = dataBits;
            m_stopBits = stopBits;

            m_t1 = new Thread(new ThreadStart(SerialRun));
            m_t1.Start();
        }

        public void Close()
        {
            m_bThreadRun = false;
            if (m_t1 != null) m_t1.Join();
        }

        private void SerialRun()
        {
            SerialPort serial = null;

            while (Program.m_ThreadRun)
            {
                serial = new SerialPort();

                Parity parity = Parity.None;
                if (m_parity == 0) parity = Parity.None;
                if (m_parity == 1) parity = Parity.Odd;
                if (m_parity == 2) parity = Parity.Even;

                StopBits stopBits = StopBits.None;
                if (m_stopBits == 1) stopBits = StopBits.One;
                if (m_stopBits == 1.5) stopBits = StopBits.OnePointFive;
                if (m_stopBits == 2) stopBits = StopBits.Two;

                while (Program.m_ThreadRun)
                {
                    if (serial.m_IsConn == false)
                    {
                        serial.Init(m_portName, m_baudRate, parity, m_dataBits, stopBits);
                        //Program.m_MainForm.UpdateListBox(serial.m_strPortMsg);
                    }

                    if (serial.m_IsConn)
                    {
                        serial.Read();
                        if (serial.m_strPortMsg.Length > 0)
                        {
                            //Program.m_MainForm.UpdateListBox(serial.m_strPortMsg);
                        }

                        m_recvCount = serial.m_recvCount;

                        List<byte> buff = serial.GetBuffer(false);
                        if (buff.Count == 0) continue;

                        int nFrameSize = GetFrameSize();

                        if ((nFrameSize > 0 && serial.GetBufferSize() >= nFrameSize)
                            || (buff[buff.Count - 1] == GetFrameDelimiter()))
                        {
                            if (Parse(buff))
                            {
                                serial.ClearBuffer();
                                //Program.m_MainForm.UpdateValue(this.GetValue());
                            }
                            //Program.m_MainForm.UpdateListBox("[" + buff.Count.ToString() + "] " + Encoding.Default.GetString(buff.ToArray()));
                        }
                    }
                    else
                    {
                        System.Threading.Thread.Sleep(10000);
                    }
                }
            }
            serial.Close();
        }

    }
}