using Aurora.Api;
using AuroraPLC;
using System;
using System.Runtime.InteropServices;

namespace AuroraMelsecNet
{
    public class MelsecNet : PLCNetwork
    {
        private readonly Logger Log = new Logger("PLC MelsecNet");

        #region MelsecNet DLL import
        // MelsecNet data link library
        // For C#
        // C:\Windows\SysWOW64 경로에 mdfunc32W.dll 파일 존재함
        // 일단은 mdfunc32 로 검증후, mdfunc32w 검토...mdfunc32w 는 64비트를 의미하는걸까?

        // Charset: 문자열 관련, 인자로 string 사용안하니, 중요하지 않을 것 같은데..???
        // SetLastError: 에러를 셋 여부로 에러 처리 관련인듯한데..

        [DllImport("MDFUNC32.DLL", EntryPoint = "mdOpen", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdOpen(short chan, short mode, ref long path);
        [DllImport("MDFUNC32.DLL", EntryPoint = "mdClose", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdClose(long path);
        [DllImport("MDFUNC32.DLL", EntryPoint = "mdSend", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdSend(long path, short stno, short devtyp, short devno, ref short size, ref short data);
        [DllImport("MDFUNC32.DLL", EntryPoint = "mdReceive", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdReceive(long path, short stno, short devtyp, short devno, ref short size, ref short data);
        /* // 현재 주기적 배치 Read/Write 방식상, 개별적인 콜이 불필요하여 일단 주석처리..
        [DllImport("MDFUNC32.DLL", EntryPoint = "mdreceiveex", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdReceiveEx(int path, short Netno, short Stno, short Devtyp, short DevNo, ref short Size_Renamed, ref short Buf);
        [DllImport("MDFUNC32.DLL", EntryPoint = "mdsendex", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdSendEx(int path, short Netno, short Stno, short Devtyp, short DevNo, ref short Size_Renamed, ref short Buf);

        [DllImport("MDFUNC32.DLL", EntryPoint = "mddevset", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdDevSet(int path, short Stno, short Devtyp, short DevNo);

        [DllImport("MDFUNC32.DLL", EntryPoint = "mddevrst", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        private static extern short mdDevRst(int path, short Stno, short Devtyp, short DevNo);
        */
        #endregion


        #region 네트워크 설정 관련
        // 채널: 51 for NET-H, 151 for NET-G

        // owner station: 0xFF
        // remote station: 0x102  .... 0xFF ??

        #endregion

        //public short StationNo { get; private set; }
        //public short ChannelNo { get; private set; }

        // 통신 연결된 path 포인터 (C++ 경우); Melsec 용
        private long _pathForOpenedLine;
        private short _channelNo;
        private short _mode;
        private short _stationNo;

        private const int _success = 0;
        private bool IsConnected = false;

        public MelsecNet()
        {
            //_isSimul = isSimul;
        }

        public override void SetInitParams(short channelNo, short mode, short stationNo)
        {
            _channelNo = channelNo;
            _mode = mode;
            _stationNo = stationNo;
        }

        public override bool OpenToPLC()
        {
            try {   // 장비가 없을 때 에러를 막기 위한 용...
                // Repair 코드에서도 1회 재시도를 하고 있음...

                // MX Component 와 비슷하게~~~
                if (IsConnected) {
                    var result = mdClose(_pathForOpenedLine);
                    IsConnected = !result.Equals(_success);
                    Log.I($"mdClose: 0x{result:x8} [Hex]");
                    //Thread.Sleep(500);  // Melsec 문서보고 재검토..
                }
                var res = mdOpen(_channelNo, _mode, ref _pathForOpenedLine);
                IsConnected = res.Equals(_success);
                Log.I($"mdOpen: 0x{res:x8} [Hex]");

                // 1회 재시도..
                if (IsConnected == false) {
                    // TODO : 리턴코드 확인 후...
                }
                return IsConnected;
            } catch (Exception ex) {   // 일단 무조건 장비가 없을 경우를 가정한다.
                Log.E($"Exception from mdOpen: {ex.Message}");
                IsConnected = false;
                return false;
            }
        }

        public override bool CloseToPLC()
        {
            try {
                var res = mdClose(_pathForOpenedLine);
                IsConnected = !res.Equals(_success);  // 닫기 성공이면, false
                Log.I($"mdClose: 0x{res:x8} [Hex]");
                // Need 딜레이 ??
            } catch (Exception ex) {
                Log.E($"Exception from mdClose: {ex.Message}");
                return !IsConnected;
            }

            return !IsConnected;
        }

        public override bool ReceiveFromPLC(short devType, short startDevNo, ref short readByteSize, ref short readData)
        {
            // 여긴 굳이 try-catch 가 불필요할듯..
            return mdReceive(_pathForOpenedLine, _stationNo, devType, startDevNo, ref readByteSize, ref readData).Equals(_success);
        }

        public override bool SendToPLC(short devType, short startDevNo, ref short writtenByteSize, ref short writtenData)
        {
            return mdSend(_pathForOpenedLine, _stationNo, devType, startDevNo, ref writtenByteSize, ref writtenData).Equals(_success);
        }
    }
}