using System;
using System.Collections.Generic;
using Xylem.Common.Hardware.Interfaces.Ports.PortCore;

namespace Xylem.Common.Hardware.Interfaces.Protocols.TransmitProtocol
{
    public class RfidTransmitProtocol : UartTransmitProtocol
    {
        //use the UART transmit protocol sync byte wrapped to RFID protocol
        private const Byte ProtSyncByte = 0x5B;
        private const UInt16 ProtAddLength = 1;
        private readonly UInt16? _protLengthIndex = 1;
        //this will be used if RFID protocol has been extracted from RfidComPort
        //private const Byte ProtSyncByte = 0x01;
        //private const UInt16 ProtAddLength = 1;
        //private readonly UInt16? _protLengthIndex = 3;

        private const Int32 DefaultResponseTimeoutMs = 1550;
        private Int32 _responseTimeoutMs = DefaultResponseTimeoutMs;
        
        /// <inheritdoc />
        public override void SetResponseTimeout(Int32 responseTimeoutMs)
        {
            _responseTimeoutMs = responseTimeoutMs;
        }
        /// <inheritdoc />
        public override void SetDefaultResponseTimeout()
        {
            _responseTimeoutMs = DefaultResponseTimeoutMs;
        }
        private const UInt32 BaudRate = 9600;
        private readonly UInt32? _receiveBufferFlushThreshold = null;

        public RfidTransmitProtocol(String portName) : base (portName)
        {

        }
        public override TransmitPortSettings GetTransmitPortSettings()
        {
            return new TransmitPortSettings(ProtSyncByte, _protLengthIndex, ProtAddLength, 
                _responseTimeoutMs, BaudRate, _receiveBufferFlushThreshold);
        }
        public override List<Byte> SpecificCrcCalc()
        {
            //returns an empty list of bytes to avoid filling of CRC in advance to the CRC calculation, 
            //because the RFID does not use the CRC filled up with 0x00, 0x00 to calculate itself
            return new List<Byte>();
        }
    }
}