using Edge.Core.Database;
using Edge.Core.Processor;
using Edge.Core.IndustryStandardInterface.Pump;
using HengShan_Pump_TQC_IFSF.MessageEntity;
using HengShan_Pump_TQC_IFSF.MessageEntity.Incoming;
using HengShan_Pump_TQC_IFSF.MessageEntity.Outgoing;
using Edge.Core.Parser.BinaryParser.Util;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using Wayne.FDCPOSLibrary;
using Timer = System.Timers.Timer;
using Edge.Core.Configuration;

namespace HengShan_Pump_TQC_IFSF
{
    public class PumpHandler : IFdcPumpController//, IDeviceHandler<byte[], IfsfMessageBase>
    {
        private object syncObject = new object();
        private IEnumerable<NozzleExtraInfo> nozzleExtraInfos = null;

        //protected static ILog logger = log4net.LogManager.GetLogger("PumpHandler");
        protected static NLog.Logger logger = NLog.LogManager.LoadConfiguration("nlog.config").GetLogger("PumpHandler");

        protected IContext<byte[], IfsfMessageBase> context;

        /// <summary>
        /// default to first nozzle
        /// </summary>
        protected byte currentCallingNozzleLogicalId = 1;
        protected LogicalDeviceState lastLogicalDeviceState = LogicalDeviceState.FDC_CLOSED;
        private DateTime lastLogicalDeviceStateReceivedTime;
        // by seconds
        public const int lastLogicalDeviceStateExpiredTime = 6;
        private Guid uniqueId = Guid.NewGuid();
        private PumpGroupHandler parent;
        protected int pumpId = -1;

        protected List<LogicalNozzle> nozzles = new List<LogicalNozzle>();
        private byte recipientSubnet = 1;
        private byte recipientNode = 1;
        private byte ifsfFuelPointId;
        Func<byte> msgTokenGenerator;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="pumpId"></param>
        /// <param name="ifsfFuelPointId">range from 0x21 to 0x24</param>
        /// <param name="recipientSubnet">used to locate the remote tqc pump, must a value different from FC</param>
        /// <param name="recipientNode">used to locate the remote tqc pump</param>
        /// <param name="nozzlesXmlConfiguration"></param>
        public PumpHandler(PumpGroupHandler parent, int pumpId, byte ifsfFuelPointId, byte recipientSubnet, byte recipientNode, string nozzlesXmlConfiguration, Func<byte> msgTokenGenerator)
        {
            //sample of nozzlesXmlConfiguration
            //	<Pump id='3'>
            //		<Nozzles>
            //			<Nozzle logicalId='1' physicalId='0x11' />
            //			<Nozzle logicalId='2' physicalId='0x12' />
            //		</Nozzles>
            //	</Pump>
            this.pumpId = pumpId;
            this.parent = parent;
            this.ifsfFuelPointId = ifsfFuelPointId;
            this.recipientSubnet = recipientSubnet;
            this.recipientNode = recipientNode;
            this.msgTokenGenerator = msgTokenGenerator;

            var xmlDocument = new XmlDocument();
            xmlDocument.LoadXml(nozzlesXmlConfiguration);
            foreach (var nozzleElement in xmlDocument.GetElementsByTagName("Nozzle").Cast<XmlNode>())
            {
                byte physicalIdValue;
                var rawPhysicalIdValue = nozzleElement.Attributes["physicalId"].Value;
                if (rawPhysicalIdValue.StartsWith("0x") || rawPhysicalIdValue.StartsWith("0X"))
                    physicalIdValue = byte.Parse(nozzleElement.Attributes["physicalId"].Value.Substring(2), NumberStyles.HexNumber);
                else
                    physicalIdValue = byte.Parse(nozzleElement.Attributes["physicalId"].Value);
                if (physicalIdValue < 0x11 || physicalIdValue > 0x18)
                    throw new ArgumentException("ifsf nozzle id must be range from 0x11 to 0x18, while the configuration passed in " + rawPhysicalIdValue);
                this.nozzles.Add(new LogicalNozzle(pumpId, physicalIdValue, byte.Parse(nozzleElement.Attributes["logicalId"].Value), null));
                //if (nozzleElement.Attributes["ifsfLogicalNozzleId"] != null)
                //    this.logicalNozzleIdMappingToIfsfLogicalNozzlelId.Add(
                //        byte.Parse(nozzleElement.Attributes["ifsfLogicalNozzleId"].Value.Substring(2), NumberStyles.HexNumber),
                //        byte.Parse(nozzleElement.Attributes["logicalId"].Value));
            }
        }

        public string Name => this.GetType().FullName;

        public int PumpId => this.pumpId;

        /// <summary>
        /// range from 0x21 to 0x24 since it's a IFSF pump
        /// </summary>
        public int PumpPhysicalId => this.ifsfFuelPointId;

        public IEnumerable<LogicalNozzle> Nozzles => this.nozzles;

        public int AmountDecimalDigits => 2;

        public int VolumeDecimalDigits => 2;
        public int PriceDecimalDigits => 2;

        public int VolumeTotalizerDecimalDigits => 2;
        public Guid Id => this.uniqueId;

        public event EventHandler<FdcPumpControllerOnStateChangeEventArg> OnStateChange;
        public event EventHandler<FdcTransactionDoneEventArg> OnCurrentFuellingStatusChange;
        protected void FireOnStateChangeEvent(LogicalDeviceState state, LogicalNozzle stateChangedNozzle)
        {
            try
            {
                var safe = this.OnStateChange;
                safe?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(state, stateChangedNozzle));
            }
            catch (Exception exx)
            {
                logger.Info("exceptioned when FireOnStateChangeEvent: " + exx + Environment.NewLine + "Will Ignore and do nothing");
            }
        }

        protected void FireOnCurrentFuellingStatusChangeEvent(FdcTransaction trx)
        {
            try
            {
                var safe = this.OnCurrentFuellingStatusChange;
                safe?.Invoke(this, new FdcTransactionDoneEventArg(trx));
            }
            catch (Exception exx)
            {
                logger.Info("exceptioned when FireOnCurrentFuellingStatusChangeEvent: " + exx + Environment.NewLine + "Will Ignore and do nothing");
            }
        }

        public virtual void Init(IContext<byte[], IfsfMessageBase> context)
        {
            this.context = context;
        }

        public virtual Task Process(IContext<byte[], IfsfMessageBase> context)
        {
            this.context = context;
            switch (context.Incoming.Message)
            {
                case FuellingPointDb_FpStatus_Event fpStatusEvent:
                    {
                        logger.Info("Pump " + this.pumpId + ", receiving Ifsf PumpState(by fpStatusEvent): "
                            + fpStatusEvent.FuelPointState
                            + "(internal FdcState: " + this.lastLogicalDeviceState + ")");
                        // send query only when at cold start.
                        if (fpStatusEvent.FuelPointState == FuellingPointStatus.Idle
                            && this.lastLogicalDeviceState == LogicalDeviceState.FDC_CLOSED)
                        {
                            logger.Info("Pump " + this.pumpId + ", State changing from Fdc_CLOSED to Ifsf IDLE, always send a query to see any open trx stacked in TQC pump side");
                            context.Outgoing.Write(
                                  new FuelTrxDb_Read_QueryTransaction(this.recipientSubnet, this.recipientNode, PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode,
                                  this.msgTokenGenerator(), this.ifsfFuelPointId, null));
                        }

                        // when trx event piped in, there's no nozzle info linked it within the event(ifsf bad design?), so here always track
                        // and keep the state of the last calling or fuelling nozzle.
                        if (fpStatusEvent.FuelPointState == FuellingPointStatus.CALLING
                            || fpStatusEvent.FuelPointState == FuellingPointStatus.FUELLING)
                        {
                            var operatingNozzlePhysicalId = (byte)(fpStatusEvent.RemovedNozzleIndexes.First() + 0x10);
                            if (this.nozzles.Any(n => n.PhysicalId == operatingNozzlePhysicalId))
                                this.currentCallingNozzleLogicalId = this.nozzles.First(n => n.PhysicalId == operatingNozzlePhysicalId).LogicalId;
                            else
                                this.currentCallingNozzleLogicalId = fpStatusEvent.RemovedNozzleIndexes.FirstOrDefault();
                            logger.Info("Pump " + this.pumpId + ", reporting removed(lifted) ifsf NozzleId is 0x"
                               + operatingNozzlePhysicalId.ToHexLogString()
                               + ", correlated Fdc Nozzle logical Id is " + this.currentCallingNozzleLogicalId);
                        }

                        this.HandleFpStatusChange(fpStatusEvent.FuelPointState,
                            this.nozzles.FirstOrDefault(n => n.LogicalId == this.currentCallingNozzleLogicalId));
                        break;
                    }
                case FuellingPointDb_FpStatus_Answer fpStatusAnswer:
                    {
                        // send query only when at cold start.
                        if (fpStatusAnswer.FuelPointState == FuellingPointStatus.Idle && this.lastLogicalDeviceState == LogicalDeviceState.FDC_CLOSED)
                        {
                            logger.Info("Pump " + this.pumpId + ", State changed from CLOSED to IDLE, likely a cold start, send query to see any open trx");
                            context.Outgoing.Write(
                                  new FuelTrxDb_Read_QueryTransaction(this.recipientSubnet, this.recipientNode, PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode,
                                  this.msgTokenGenerator(), this.ifsfFuelPointId, null));
                        }

                        this.HandleFpStatusChange(fpStatusAnswer.FuelPointState, this.nozzles.FirstOrDefault(n => n.LogicalId == this.currentCallingNozzleLogicalId));
                        break;
                    }
                case FuellingPointDb_FpRunningTransaction_Event fpRunningTrxEvent:
                    {
                        logger.Debug("Pump " + this.pumpId + ", fpRunningTrxEvent ifsf FpId: 0x" + fpRunningTrxEvent.TargetFuelPointId.ToHexLogString()
                            + ", CurAmt and CurVol(no decimal points): " + fpRunningTrxEvent.CurrentAmount
                            + " - " + fpRunningTrxEvent.CurrentVolume);
                        var operatingNozzle = this.nozzles.First(f => f.LogicalId == this.currentCallingNozzleLogicalId);
                        var operatingNozzleProductPrice =
                            this.parent.tqcPumpGroupInitializer.PriceBook[
                                this.nozzleExtraInfos.First(c => c.PumpId == operatingNozzle.PumpId
                                    && c.NozzleLogicalId == operatingNozzle.LogicalId).ProductBarcode];
                        //fire fuelling progress.
                        var safe1 = this.OnCurrentFuellingStatusChange;
                        safe1?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                        {
                            Nozzle = operatingNozzle,
                            Amount = fpRunningTrxEvent.CurrentAmount,
                            Volumn = fpRunningTrxEvent.CurrentVolume,
                            Price = operatingNozzleProductPrice,
                            Finished = false,
                        }));
                        break;
                    }
                case FuellingTrxDb_TransactionBufferStatus_Event trxBufferStatusEvent:
                    {
                        if (trxBufferStatusEvent.State == FuellingTrxDb_TransactionBufferStatus_Event.TransactionState.PAYABLE
                            && (trxBufferStatusEvent.Volume != 0 || trxBufferStatusEvent.Amount != 0))
                        {
                            logger.Debug("Pump " + this.pumpId + ", received a Payable trx from TQC with Vol and Amount(without decimal points): "
                                + trxBufferStatusEvent.Volume + " - " + trxBufferStatusEvent.Amount
                                + ", will send clear to clear it in pump side anyway");
                            context.Outgoing.WriteAsync(
                                new FuellingPointDbRequest_Write_ClearTransaction(this.recipientSubnet,
                                  this.recipientNode,
                                  PumpGroupHandler.originatorSubnet,
                                  PumpGroupHandler.originatorNode,
                                  this.msgTokenGenerator(), this.ifsfFuelPointId, trxBufferStatusEvent.TransactionSeqNumber.ToString()),
                                (request, response) => response is AcknowledgeMessage rp && request is IfsfMessage rq && rp.MessageToken == rp.MessageToken,
                                (_, expectedResponse) =>
                                {
                                    if (expectedResponse != null)
                                    { }
                                    else logger.Info("Pump " + this.pumpId + ", Clear transaction in TQC side failed");

                                    var operatingNozzle = this.nozzles.First(f => f.LogicalId == this.currentCallingNozzleLogicalId);
                                    var operatingNozzleProductPrice = this.parent.tqcPumpGroupInitializer.PriceBook[this.nozzleExtraInfos.First(c => c.PumpId == operatingNozzle.PumpId && c.NozzleLogicalId == operatingNozzle.LogicalId).ProductBarcode];

                                    var safe1 = this.OnCurrentFuellingStatusChange;
                                    safe1?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                                    {
                                        Nozzle = operatingNozzle,
                                        Amount = trxBufferStatusEvent.Amount,
                                        Volumn = trxBufferStatusEvent.Volume,
                                        Price = operatingNozzleProductPrice,
                                        SequenceNumberGeneratedOnPhysicalPump = trxBufferStatusEvent.TransactionSeqNumber,
                                        Finished = true,
                                    }));


                                }, 12000);
                        }
                        break;
                    }
                case FuellingTrxDb_TransactionBufferStatus_Answer trxBufferStatusAnswer:
                    {
                        if (trxBufferStatusAnswer.State.HasValue
                            && trxBufferStatusAnswer.State == FuellingTrxDb_TransactionBufferStatus_Event.TransactionState.PAYABLE)
                        {
                            logger.Debug("Pump " + this.pumpId + ", received a Payable trx from TQC with Vol and Amount(without decimal points): "
                                + trxBufferStatusAnswer.Volume + " - " + trxBufferStatusAnswer.Amount
                                + ", sequenceNo.: " + trxBufferStatusAnswer.TransactionSeqNumber
                                + ", will send ClearTransaction to clear it now");
                            context.Outgoing.WriteAsync(
                                new FuellingPointDbRequest_Write_ClearTransaction(this.recipientSubnet,
                                  this.recipientNode,
                                  PumpGroupHandler.originatorSubnet,
                                  PumpGroupHandler.originatorNode,
                                  this.msgTokenGenerator(), this.ifsfFuelPointId, trxBufferStatusAnswer.TransactionSeqNumber.ToString()),
                                (request, response) => response is AcknowledgeMessage rp && request is IfsfMessage rq && rp.MessageToken == rp.MessageToken,
                                (_, expectedResponse) =>
                                {
                                    if (expectedResponse != null)
                                    {
                                        var operatingNozzle = this.nozzles.First(f => f.LogicalId == this.currentCallingNozzleLogicalId);
                                        var operatingNozzleProductPrice = this.parent.tqcPumpGroupInitializer.PriceBook[this.nozzleExtraInfos.First(c => c.PumpId == operatingNozzle.PumpId && c.NozzleLogicalId == operatingNozzle.LogicalId).ProductBarcode];

                                        var safe1 = this.OnCurrentFuellingStatusChange;
                                        safe1?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                                        {
                                            Nozzle = operatingNozzle,
                                            Amount = trxBufferStatusAnswer.Amount,
                                            Volumn = trxBufferStatusAnswer.Volume,
                                            Price = operatingNozzleProductPrice,
                                            SequenceNumberGeneratedOnPhysicalPump = trxBufferStatusAnswer.TransactionSeqNumber,
                                            Finished = true,
                                        }));
                                    }
                                    else logger.Error("Clear transaction in TQC side failed");
                                }, 8000);
                        }
                        break;
                    }
                case IfsfMessage ifsfMessage:
                    {
                        var dbParser = DatabaseDataParser.New().Convert(ifsfMessage.RawDatabaseData.ToArray());
                        break;
                    }
            }

            //if (context.Incoming.Message is FuellingPointDb_FpStatus_Event fpStatusChangeEvent && fpStatusChangeEvent.TargetFuelPointId == this.ifsfFuelPointId)
            //{
            //    this.lastLogicalDeviceState = LogicalDeviceState.FDC_READY;

            //}
            return Task.CompletedTask;
        }

        public virtual void HandleFpStatusChange(FuellingPointStatus newStatus, LogicalNozzle stateChangedNozzle)
        {
            this.lastLogicalDeviceStateReceivedTime = DateTime.Now;
            switch (newStatus)
            {
                case FuellingPointStatus.Idle:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_READY)
                        {
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_READY;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_READY, null);
                        }

                        break;
                    }
                case FuellingPointStatus.CALLING:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_CALLING)
                        {
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_CALLING;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_CALLING, stateChangedNozzle);
                        }

                        break;
                    }
                case FuellingPointStatus.AUTHORISED:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_AUTHORISED)
                        {
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_AUTHORISED;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_AUTHORISED, stateChangedNozzle);
                        }

                        break;
                    }
                case FuellingPointStatus.STARTED:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_STARTED)
                        {
                            // simulate a FDC_AUTHORISED event since TQC will not send this state in.
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_AUTHORISED;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_AUTHORISED, stateChangedNozzle);

                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_STARTED;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_STARTED, stateChangedNozzle);
                        }

                        break;
                    }
                case FuellingPointStatus.FUELLING:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_FUELLING)
                        {
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_FUELLING;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_FUELLING, stateChangedNozzle);
                        }

                        break;
                    }
                case FuellingPointStatus.Inoperative:
                    {
                        if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_OFFLINE)
                        {
                            this.lastLogicalDeviceState = LogicalDeviceState.FDC_OFFLINE;
                            this.FireOnStateChangeEvent(LogicalDeviceState.FDC_OFFLINE, null);
                        }

                        break;
                    }
                case FuellingPointStatus.Closed:
                    {
                        this.lastLogicalDeviceState = LogicalDeviceState.FDC_CLOSED;
                        logger.Info("Pump " + this.pumpId + " with ifsf fuelPoint id: 0x" + this.ifsfFuelPointId.ToHexLogString() + " is in Closed state, will open it...");
                        this.FireOnStateChangeEvent(LogicalDeviceState.FDC_CLOSED, null);
                        context.Outgoing.WriteAsync(
                            new FuellingPointDbRequest_Write_OpenFuelPoint(this.recipientSubnet,
                                  this.recipientNode,
                                  PumpGroupHandler.originatorSubnet,
                                  PumpGroupHandler.originatorNode,
                                  this.msgTokenGenerator(), this.ifsfFuelPointId),
                                    (request, response) => (response is IfsfMessage rp) && (request is IfsfMessage rq) && rp.MessageToken == rq.MessageToken
                                    && rp.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK, (_, response) =>
                                    {
                                        if (response != null)
                                            logger.Debug("Pump " + this.pumpId + ", Open FP 0x" + this.ifsfFuelPointId.ToHexLogString() + " Acked succeed");
                                        else
                                            logger.Info("Pump " + this.pumpId + ", Open FP 0x" + this.ifsfFuelPointId.ToHexLogString() + " timedout for Ack, failed");
                                    }, 8000);
                        break;
                    }
            }
        }

        public virtual async Task<bool> AuthorizeAsync(byte logicalNozzleId)
        {
            //bool authSucceed = false;
            //AutoResetEvent blocker = new AutoResetEvent(false);
            var authResponse = await this.context.Outgoing.WriteAsync(new FuellingPointDbRequest_Write_AuthorizeFuelPoint(this.recipientSubnet, this.recipientNode,
                 PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode, this.msgTokenGenerator(), this.ifsfFuelPointId, null),
                 (request, response) =>
                     (response is AcknowledgeMessage rp) && (request is IfsfMessage rq)
                         && rp.MessageToken == rq.MessageToken
                         && rp.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK, 6000);
            var authSucceed = false;
            if (authResponse is AcknowledgeMessage ackMsg)
            {
                if (ackMsg.OverallStatus == MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                {
                    //context.Outgoing.Write(new FuellingPointDbRequest_Read_FuelPointState(this.recipientSubnet,
                    //    this.recipientNode,
                    //    PumpGroupHandler.originatorSubnet,
                    //    PumpGroupHandler.originatorNode,
                    //    this.msgTokenGenerator(), this.ifsfFuelPointId));

                    logger.Debug("Pump " + this.pumpId + ", Auth FP: 0x" + this.ifsfFuelPointId.ToHexLogString() + " ACKed with succeed");
                    authSucceed = true;
                }
                else
                {
                    logger.Info("Pump " + this.pumpId + ", Auth FP: 0x" + this.ifsfFuelPointId.ToHexLogString() + " ACKed but failed with internal reason: \r\n" + ackMsg.ToLogString()
                        + "\r\n it may caused by unpaid trx still stacked in TQC pump side and then refuse to be authorized, here send query payable trx request anyway");
                    context.Outgoing.Write(
                          new FuelTrxDb_Read_QueryTransaction(this.recipientSubnet, this.recipientNode, PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode,
                          this.msgTokenGenerator(), this.ifsfFuelPointId, null));
                    authSucceed = false;
                }
            }
            else
                logger.Info("Pump " + this.pumpId + ", Auth FP: 0x" + this.ifsfFuelPointId.ToHexLogString() + " timed out for ACK");
            return authSucceed;
        }

        public virtual async Task<bool> AuthorizeWithAmountAsync(int moneyAmountWithoutDecimalPoint, byte logicalNozzleId)
        {
            // temp fake change!!!
            return await this.AuthorizeAsync(logicalNozzleId);
        }

        public virtual async Task<bool> AuthorizeWithVolumeAsync(int volumnWithoutDecimalPoint, byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

        public virtual async Task<bool> ChangeFuelPriceAsync(int newPriceWithoutDecimalPoint, byte logicalNozzleId)
        {
            var productNo = this.nozzleExtraInfos.FirstOrDefault(c => c.PumpId == this.pumpId && c.NozzleLogicalId == logicalNozzleId)?.ProductBarcode;
            if (productNo == null)
            {
                logger.Error("Pump " + this.pumpId + ", Change Price for productNo: " + productNo + " with new price: " + newPriceWithoutDecimalPoint + " failed due to product not found in config for target pump");
                return false;
            }

            logger.Info("Pump: " + this.pumpId + ", " + "Change Fuel Price for LogicalNozzle: "
                + logicalNozzleId + " with newPriceWithoutDecimalPoint: " + newPriceWithoutDecimalPoint);
            var priceChangeResponse = await this.context.Outgoing.WriteAsync(new ProductPerFuellingModeDbRequest_Write_SetPrice(this.recipientSubnet, this.recipientNode,
                 PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode, this.msgTokenGenerator(),
                 productNo.ToString(),
                 newPriceWithoutDecimalPoint.ToString(),
                 0x11),
                 (request, response) =>
                     (response is AcknowledgeMessage rp) && (request is IfsfMessage rq)
                         && rp.MessageToken == rq.MessageToken
                         && rp.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK,
                 8000);
            bool changePriceSucceed = false;
            if (priceChangeResponse is AcknowledgeMessage ackMsg
                && ackMsg.OverallStatus == MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
            {
                logger.Info("Pump " + this.pumpId + ", Change Price for productNo: " + productNo + " with new price: " + newPriceWithoutDecimalPoint + " ACKed with Positive but still querying the price again for double confirm...");
                var doubleConfirmQueryPriceResponse = await this.context.Outgoing.WriteAsync(
                new ProductPerFuellingModeDbRequest_Read_ProductPrice(this.recipientSubnet, this.recipientNode,
                    PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode, this.msgTokenGenerator(),
                    productNo.ToString(), 0x11),
                (readPriceRequest, readPriceResponse) =>
                    (readPriceResponse is ProductPerFuellingModeDb_ProductPrice_Answer rp)
                    && (readPriceRequest is IfsfMessage rq)
                    && rp.MessageToken == rq.MessageToken
                    && rp.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                    && rp.FuelModeId == 0x11,
                5000) as ProductPerFuellingModeDb_ProductPrice_Answer;
                if (doubleConfirmQueryPriceResponse != null)
                {
                    logger.Info("Pump " + this.pumpId + ", doubleConfirmQueryPrice, Price for productNo: " + productNo
                          + " queried with price(without decimal points): " + doubleConfirmQueryPriceResponse.Price);
                    int queriedPumpSidePrice;
                    if (!int.TryParse(doubleConfirmQueryPriceResponse.Price, out queriedPumpSidePrice))
                    {
                        logger.Info("Pump " + this.pumpId + ", Change Price for productNo: " + productNo
                            + " with new price(without decimal points): "
                            + newPriceWithoutDecimalPoint + " failed due to double confirm price response price value is un-recognize: " + (doubleConfirmQueryPriceResponse.Price ?? ""));
                        changePriceSucceed = false;
                    }
                    else
                    {
                        if (queriedPumpSidePrice != newPriceWithoutDecimalPoint)
                        {
                            logger.Info("Pump " + this.pumpId + ", doubleConfirmQueryPrice, Price for productNo: " + productNo
                                    + " queried with price(without decimal points): " + doubleConfirmQueryPriceResponse.Price
                                    + " does not match expected new price: " + newPriceWithoutDecimalPoint);
                            changePriceSucceed = false;
                        }
                        else
                        {
                            logger.Info("Pump " + this.pumpId + ", doubleConfirmQueryPrice, Price for productNo: " + productNo
                                      + " has been double confirmed and it's aligned with TQC side, change price succeed.");
                            changePriceSucceed = true;
                            this.nozzles.First(n => n.LogicalId == logicalNozzleId).RealPriceOnPhysicalPump = newPriceWithoutDecimalPoint;
                            this.parent.tqcPumpGroupInitializer.PriceBook[productNo.Value] = newPriceWithoutDecimalPoint;
                            logger.Info("Pump " + this.pumpId + ", PriceBook updated to: \r\n"
                                + this.parent.tqcPumpGroupInitializer.PriceBook.Keys.Select(s => "productNo: " + s + ", price: " + this.parent.tqcPumpGroupInitializer.PriceBook[s])
                                    .Aggregate((acc, n) => acc + "\r\n" + n));
                        }
                    }
                }
                else
                {
                    logger.Info("Pump " + this.pumpId + ", doubleConfirmQueryPrice timedout, but still treat this Price change as succeed since Acked with Positive");
                    changePriceSucceed = true;
                    this.nozzles.First(n => n.LogicalId == logicalNozzleId).RealPriceOnPhysicalPump = newPriceWithoutDecimalPoint;
                    this.parent.tqcPumpGroupInitializer.PriceBook[productNo.Value] = newPriceWithoutDecimalPoint;
                    logger.Info("Pump " + this.pumpId + ", PriceBook updated to: \r\n"
                        + this.parent.tqcPumpGroupInitializer.PriceBook.Keys.Select(s => "productNo: " + s + ", price: " + this.parent.tqcPumpGroupInitializer.PriceBook[s])
                            .Aggregate((acc, n) => acc + "\r\n" + n));
                }
            }
            else
            {
                logger.Info("Pump " + this.pumpId + ", Change Price for productNo: " + productNo + " with new price(without decimal points): "
                      + newPriceWithoutDecimalPoint + " ACK timed out or ACKed with non-positive, price change failed!");
                changePriceSucceed = false;
            }

            return changePriceSucceed;
        }

        public virtual async Task<bool> FuelingRoundUpByAmountAsync(int amount)
        {
            // temp fake change!!!
            return await Task.FromResult(true);
        }

        public virtual async Task<bool> FuelingRoundUpByVolumeAsync(int volume)
        {
            // temp fake change!!!
            return await Task.FromResult(true);
        }

        public virtual async Task<LogicalDeviceState> QueryStatusAsync()
        {
            if (!this.parent.tqcPumpGroupInitializer.IsInitDone) return LogicalDeviceState.FDC_CLOSED;
            if (this.lastLogicalDeviceState == LogicalDeviceState.FDC_CLOSED)
            {
                logger.Debug("Pump " + this.pumpId + ", QueryStatus(), FP: 0x" + this.ifsfFuelPointId.ToHexLogString() + " still in Closed state, will send a real status query to TQC");
                this.context.Outgoing.Write(
                    new FuellingPointDbRequest_Read_FuelPointState(this.recipientSubnet,
                     this.recipientNode,
                     PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode, this.msgTokenGenerator(),
                     this.ifsfFuelPointId));
            }

            return this.lastLogicalDeviceState;
        }

        /// <summary>
        /// no decimal point value.
        /// </summary>
        /// <returns>MoneyTotalizer:VolumnTotalizer</returns>
        public virtual async Task<System.Tuple<int, int>> QueryTotalizerAsync(byte logicalNozzleId)
        {
            System.Tuple<int, int> result = new System.Tuple<int, int>(-1, -1);
            if (!this.parent.tqcPumpGroupInitializer.IsInitDone)
                return result;
            var tqcLogicalNozzleId = this.nozzles.First(n => n.LogicalId == logicalNozzleId).PhysicalId;
            var queryResponse = await this.context.Outgoing.WriteAsync(
                new LogicalNozzleDb_Read_QueryTotalizer(this.recipientSubnet, this.recipientNode,
                    PumpGroupHandler.originatorSubnet, PumpGroupHandler.originatorNode, this.msgTokenGenerator(), this.ifsfFuelPointId, tqcLogicalNozzleId)
                    , (request, response) =>
                        (response is LogicalNozzleDb_NozzleTotalizer_Answer rp) && (request is IfsfMessage rq)
                             && rp.MessageToken == rq.MessageToken
                             && rp.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER, 8000);

            if (queryResponse != null && queryResponse is LogicalNozzleDb_NozzleTotalizer_Answer ___)
            {
                result = new System.Tuple<int, int>(Convert.ToInt32(___.MoneyTotal * Math.Pow(10, this.AmountDecimalDigits)), Convert.ToInt32(___.VolumeTotal * Math.Pow(10, this.VolumeDecimalDigits)));
                logger.Debug("Pump " + this.pumpId + ", QueryTotalizer(), FP: 0x" + this.ifsfFuelPointId.ToHexLogString()
                    + ", FC logicalNozzleId: " + logicalNozzleId + ", Tqc ifsf logicalNozzleId: 0x" + tqcLogicalNozzleId.ToHexLogString()
                    + " succeed, no decimal point money and vol acc: " + result.Item1 + " - " + result.Item2);
            }
            else
            {
            }

            return result;
        }

        public virtual async Task<bool> ResumeFuellingAsync()
        {
            throw new NotImplementedException();
        }

        public virtual async Task<bool> SuspendFuellingAsync()
        {
            throw new NotImplementedException();
        }

        public virtual async Task<bool> UnAuthorizeAsync(byte logicalNozzleId)
        {
            // temp fake change!!!
            return await Task.FromResult(true);
            //throw new NotImplementedException();
        }

        public async Task<bool> LockNozzleAsync(byte logicalNozzleId)
        {
            return false;
        }

        public async Task<bool> UnlockNozzleAsync(byte logicalNozzleId)
        {
            return false;
        }
        #region IDisposable Support
        private bool disposedValue = false; // To detect redundant calls

        protected virtual void Dispose(bool disposing)
        {
            if (!disposedValue)
            {
                if (disposing)
                {
                    // TODO: dispose managed state (managed objects).
                }

                // TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
                // TODO: set large fields to null.

                disposedValue = true;
            }
        }

        // TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
        // ~PumpHandler() {
        //   // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
        //   Dispose(false);
        // }

        // This code added to correctly implement the disposable pattern.
        public void Dispose()
        {
            // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
            Dispose(true);
            // TODO: uncomment the following line if the finalizer is overridden above.
            // GC.SuppressFinalize(this);
        }

        public void OnFdcServerInit(Dictionary<string, object> parameters)
        {
            if (parameters != null && parameters.TryGetValue("NozzleProductMapping", out object param))
            {
                this.nozzleExtraInfos = param as IEnumerable<NozzleExtraInfo>;
            }
        }

        #endregion

    }
}