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;
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.Processor.Dispatcher.Attributes;
using Edge.Core.Processor.Communicator;
using Edge.Core.Configuration;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.DependencyInjection;

namespace HengShan_Pump_TQC_IFSF
{

    /// <summary>
    /// one TQC connection controls a full physical pump, typically 2 sides.
    /// </summary>
    [MetaPartsRequired(typeof(GenericDeviceProcessor<,>))]
    [MetaPartsRequired(typeof(TcpClientCommunicator<>))]
    [MetaPartsRequired(typeof(ComPortCommunicator<>))]
    [MetaPartsRequired(typeof(IfsfMessageBase))]
    [MetaPartsDescriptor(
        "lang-zh-cn:LonWorks HS TQC加油机lang-en-us:LonWorks HS TQC pump",
        "lang-zh-cn:用于驱动基于 LonWorks Card 连接的IFSF协议的 稳牌-WT30 或 恒山-TH22 加油机lang-en-us:Used for driven Wayne-WT30 or HengShan-TH22 dispensers which using IFSF protocol on LonWorks Card",
        new[] { "lang-zh-cn:加油机lang-en-us:Pump" })]
    public class LonWorksPumpGroupHandler : IEnumerable<IFdcPumpController>, IDeviceHandler<byte[], IfsfMessageBase>, IDisposable
    {

        #region Ctor parameters

        public class PumpIfsfNodeGroupConfig
        {
            //public byte AmountDecimalDigits { get; set; }
            //public byte VolumeDecimalDigits { get; set; }
            //public byte PriceDecimalDigits { get; set; }
            //public byte VolumeTotalizerDecimalDigits { get; set; }
            public byte FccIfsfSubnetValue { get; set; }
            public byte FccIfsfNodeValue { get; set; }
            public List<IfsfNodeConfig> IfsfNodeConfigs { get; set; }
        }

        public class IfsfNodeConfig
        {
            /// <summary>
            /// </summary>
            public byte IfsfSubnetValue { get; set; }
            public byte IfsfNodeValue { get; set; }

            public List<IfsfFpConfig> IfsfFpConfigs { get; set; }
        }

        public class IfsfFpConfig
        {
            public byte PumpId { get; set; }
            /// <summary>
            /// 0x21 - 0x24
            /// </summary>
            public byte PhysicalId { get; set; }

            public List<IfsfNozzleConfig> IfsfNozzleConfigs { get; set; }
        }

        public class IfsfNozzleConfig
        {
            public byte LogicalId { get; set; }
            /// <summary>
            /// 0x11 - 0x18
            /// </summary>
            public byte PhysicalId { get; set; }
        }

        #endregion

        private IServiceProvider services;
        private static ILogger logger = NullLogger.Instance;
        private Timer fccHeartbeatSendingTimer;
        private Timer pumpIfsfNodeOfflineCheckTimer;
        /// <summary>
        /// treat pump ifsf node to offline if this time period have not recieve any of its message.
        /// </summary>
        private int pumpIfsfNodeOfflineTimeThresholdByMs = 25000;
        public PumpIfsfNodeGroupConfig deviceConfig;


        private object syncObject = new object();
        protected IEnumerable<NozzleExtraInfo> nozzleExtraInfos;

        private Guid uniqueId = Guid.NewGuid();

        internal List<TqcPumpGroupInitializer> tqcPumpGroupInitializers;
        //protected static ILog logger = log4net.LogManager.GetLogger("PumpHandler");


        protected IContext<byte[], IfsfMessageBase> context;
        protected List<LonWorksPumpHandler> pumpHandlers = new List<LonWorksPumpHandler>();

        //// for test, the tqc configured as subnet 1, node 1.
        //protected byte recipientSubnet = 1;
        //protected byte recipientNode = 1;
        //// originator, it's the FC self.
        public static byte originatorSubnet = 2;
        public static byte originatorNode = 1;


        public LonWorksPumpGroupHandler(PumpIfsfNodeGroupConfig pumpIfsfNodeGroupConfig, IServiceProvider services)
        {
            this.services = services;
            var loggerFactory = services.GetRequiredService<ILoggerFactory>();
            logger = loggerFactory.CreateLogger("PumpHandler");
            this.deviceConfig = pumpIfsfNodeGroupConfig;

            originatorSubnet = pumpIfsfNodeGroupConfig.FccIfsfSubnetValue;
            originatorNode = pumpIfsfNodeGroupConfig.FccIfsfNodeValue;
            //this.recipientSubnet = pumpIfsfNodeGroupConfig.IfsfSubnetValue;
            //this.recipientNodes.AddRange(pumpIfsfNodeGroupConfig.IfsfNodeConfigs.Select(pc => pc.PumpIfsfNodeValue));

            //logger.LogInformation("node " + this.recipientNodes.Select(n => n.ToString()).Aggregate((acc, n) => acc + ", " + n) + ", Will create " + pumpIfsfNodeGroupConfig.IfsfNodeConfigs.Count
            //    + " pump handlers for this TQC connection according from pumpGroupConfiguration");
            if (pumpIfsfNodeGroupConfig.IfsfNodeConfigs.SelectMany(nc => nc.IfsfFpConfigs).Any(fpConfig => fpConfig.PhysicalId < 0x21 || fpConfig.PhysicalId > 0x24))
                throw new ArgumentException("Ifsf fuel point id must be range from 0x21 to 0x24");

            foreach (var nodeConfig in pumpIfsfNodeGroupConfig.IfsfNodeConfigs)
            {
                var initor = new TqcPumpGroupInitializer(originatorSubnet, originatorNode,
                    nodeConfig.IfsfSubnetValue, nodeConfig.IfsfNodeValue, this.pumpHandlers, this.GetNewMessageToken);
                initor.OnInitTimeout += (cc, dd) =>
                {
                    logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode + ", init timed out, will start it over...");
                    initor.Reset();
                    initor.FeedIn(this.context);
                };
                initor.OnInitDone += (ee, ff) =>
                {
                    logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode + ", init done, will query all FP status and routed following msg to PumpHandlers");
                    // query all FP status, answer will be routed to each PumpHandler to handle.
                    this.context.Outgoing.Write(
                        new FuellingPointDbRequest_Read_FuelPointState(nodeConfig.IfsfSubnetValue,
                         nodeConfig.IfsfNodeValue,
                         originatorSubnet,
                         originatorNode,
                         this.GetNewMessageToken(),
                         0x20));
                    initor.pumpHandlers.SelectMany(p => p.Nozzles).ToList().ForEach(n =>
                    {
                        var boundProductNo = this.nozzleExtraInfos.First(c => c.PumpId == n.PumpId && c.NozzleLogicalId == n.LogicalId).ProductBarcode;
                        logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode
                           + ", will write back price to nozzle on pump " + n.PumpId + ", logicalNozzleId: " + n.LogicalId + ", boundProductNo: " + boundProductNo
                           + " to new Init Price(without decimal points): " + initor.PriceBook[boundProductNo]);
                        n.RealPriceOnPhysicalPump = initor.PriceBook[boundProductNo];
                    });
                };
                this.tqcPumpGroupInitializers.Add(initor);

                foreach (var fpConfig in nodeConfig.IfsfFpConfigs)
                {
                    var pumpHandler = new LonWorksPumpHandler(initor,
                        fpConfig.PumpId, fpConfig.PhysicalId,
                        nodeConfig.IfsfSubnetValue, nodeConfig.IfsfNodeValue,
                        fpConfig.IfsfNozzleConfigs, GetNewMessageToken);
                    this.pumpHandlers.Add(pumpHandler);
                }

            }
        }

        /// <summary>
        ///  will be called at the Init stage of FdcServerApp, that means before the calling the Start() for all the Processors.
        /// </summary>
        /// <param name="parameters"></param>
        public void OnFdcServerInit(Dictionary<string, object> parameters)
        {
            if (parameters != null && parameters.TryGetValue("NozzleProductMapping", out object param))
            {
                this.nozzleExtraInfos = param as IEnumerable<NozzleExtraInfo>;
            }

            this.pumpHandlers.ForEach(ph => ph.OnFdcServerInit(parameters));
        }

        public virtual void Init(IContext<byte[], IfsfMessageBase> context)
        {
            this.context = context;
            bool isCommConnected = false;
            this.context.Communicator.OnConnected += async (e, f) =>
            {
                logger.LogInformation("TqcPumpGroupInitializer, Communicator Connected, will start init each Initializer...");
                isCommConnected = true;
                foreach (var initor in this.tqcPumpGroupInitializers)
                {
                    while (isCommConnected)
                    {
                        initor.Reset();
                        if (initor.CurrentStatus == TqcPumpGroupInitializer.Status.UnInit)
                            initor.FeedIn(this.context);
                        else
                            logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode + " is already in a initing process, just wait for finish...");
                        // may refine in future for wait the init Done event.
                        var initResult = await initor.InitDoneTaskCompletionSource.Task;
                        if (initResult)
                        {
                            logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode + ", init done, will query all FP status and routed following msg to PumpHandlers");
                            // query all FP status, answer will be routed to each PumpHandler to handle.
                            this.context.Outgoing.Write(
                                new FuellingPointDbRequest_Read_FuelPointState(
                                    initor.ifsfRecipientSubnet,
                                    initor.ifsfRecipientNode,
                                    originatorSubnet,
                                    originatorNode,
                                    this.GetNewMessageToken(),
                                    0x20));

                            //var nozzleProductConfig
                            //        = Configurator.Default.NozzleExtraInfoConfiguration.Mapping;
                            initor.pumpHandlers.SelectMany(p => p.Nozzles).ToList().ForEach(n =>
                            {
                                var boundProductNo = this.nozzleExtraInfos.First(c => c.PumpId == n.PumpId && c.NozzleLogicalId == n.LogicalId).ProductBarcode;
                                logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode
                                    + ", will write back price to nozzle on pump " + n.PumpId + ", logicalNozzleId: " + n.LogicalId + ", boundProductNo: " + boundProductNo
                                    + " to new Init Price(without decimal points): " + initor.PriceBook[boundProductNo]);
                                n.RealPriceOnPhysicalPump = initor.PriceBook[boundProductNo];
                            });
                            break;
                        }
                        else
                        {
                            logger.LogInformation("TqcPumpGroupInitializer, node " + initor.ifsfRecipientNode + ", init timed out, will start it over...");
                            //initor.Reset();
                            //initor.FeedIn(this.context);
                        }
                    }
                }
            };
            this.pumpHandlers.ForEach(p => p.Init(this.context));

            //accuracy is 1000ms
            this.pumpIfsfNodeOfflineCheckTimer = new Timer(1000);
            this.pumpIfsfNodeOfflineCheckTimer.Elapsed += async (a, b) =>
            {
                var offlinePumps = this.pumpHandlers.Where(b => DateTime.Now.Subtract(b.LastIncomingMsgReceivedTime ?? DateTime.MinValue).TotalMilliseconds >= pumpIfsfNodeOfflineTimeThresholdByMs);
                if (offlinePumps.Any())
                {
                    logger.LogError($"Long time no see any msg incoming for {offlinePumps.Select(p => $"Pump {p.PumpId}").Aggregate((acc, n) => acc + ", " + n)}, will trigger them to Fdc_Offline state.");
                }
                foreach (var p in offlinePumps)
                {
                    p.HandleFpStatusChange(FuellingPointStatus.Inoperative, null);
                }
            };
            this.pumpIfsfNodeOfflineCheckTimer.Start();

            this.fccHeartbeatSendingTimer = new Timer(10000);
            this.fccHeartbeatSendingTimer.Elapsed += async (a, b) =>
            {
                context.Outgoing.Write(new LonWorksHeartbeat(1, originatorSubnet, originatorNode));
            };
            this.fccHeartbeatSendingTimer.Start();
        }

        private byte rotateMsgToken = 0;
        public byte GetNewMessageToken()
        {
            if (rotateMsgToken == (0xFF & 0x01F))
                rotateMsgToken = 0;
            else
                rotateMsgToken++;
            return rotateMsgToken;
        }

        public virtual Task Process(IContext<byte[], IfsfMessageBase> context)
        {
            this.context = context;
            var initor = this.tqcPumpGroupInitializers?.FirstOrDefault(i => i.ifsfRecipientNode == context.Incoming.Message.OriginatorNode);
            if (initor == null)
            {
                // must has initor created first
                return Task.CompletedTask;
            }

            if (!initor.IsInitDone)
            {
                initor.FeedIn(context);
                return Task.CompletedTask;
            }

            this.RouteMessageToHandlers(context);
            return Task.CompletedTask;
        }

        protected virtual void RouteMessageToHandlers(IContext<byte[], IfsfMessageBase> context)
        {
            switch (context.Incoming.Message)
            {
                case FuellingPointDb_FpStatus_Event fpStatusEvent:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == fpStatusEvent.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingPointDb_FpStatus_Answer fpStatusAnswer:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == fpStatusAnswer.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingPointDb_FpRunningTransaction_Event fpRunningTrxEvent:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == fpRunningTrxEvent.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingPointDb_FpRunningTransaction_Event_ACK fpRunningTrxEvent:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == fpRunningTrxEvent.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingTrxDb_TransactionBufferStatus_Event trxBufferStatusEvent:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == trxBufferStatusEvent.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingTrxDb_TransactionBufferStatus_Event_ACK trxBufferStatusEvent:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == trxBufferStatusEvent.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                case FuellingTrxDb_TransactionBufferStatus_Answer trxBufferStatusAnswer:
                    this.pumpHandlers.Where(h => h.PumpPhysicalId == trxBufferStatusAnswer.TargetFuelPointId).ToList().ForEach(p => p.Process(context));
                    break;
                    //default: this.pumpHandlers.ForEach(p => p.Process(context)); break;
            }
        }

        public IEnumerator<IFdcPumpController> GetEnumerator()
        {
            return this.pumpHandlers.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return this.pumpHandlers.GetEnumerator();
        }

        public Guid Id => this.uniqueId;


        /// <summary>
        /// Initalizer for init default values into TQC pump.
        /// especially for default product price: it will read pre-config values for each product in pump first,
        /// </summary>
        public class TqcPumpGroupInitializer
        {
            System.Timers.Timer initTimeoutTimer = new Timer(initTimeout);
            const int initTimeout = 10000;

            /// <summary>
            /// will fire when reached timed out time, and state is still not Done.
            /// </summary>
            public event EventHandler OnInitTimeout;
            /// <summary>
            /// false indicates init timed out, true indicates init done successfully.
            /// </summary>
            public TaskCompletionSource<bool> InitDoneTaskCompletionSource = new TaskCompletionSource<bool>();
            public event EventHandler OnInitDone;
            public event EventHandler OnInitError;

            /// <summary>
            /// init process will firstly read all necessary config values in TQC, and then execute the write operations.
            /// this event will be fired once those config values were read, and write operation is still not perform.
            /// </summary>
            public event EventHandler OnTqcExistedConfigRead;
            private List<FuellingPointDb_FpStatus_Answer> fpStatus_Answers
                = new List<FuellingPointDb_FpStatus_Answer>();

            private List<LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answer> logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers
                = new List<LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answer>();
            /// <summary>
            /// Gets pre-config value in TQC pump.
            /// </summary>
            public IEnumerable<LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answer> LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers => this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers;

            private List<ProductDb_ProductNo_Answer> productDb_ProductNo_Answers
                = new List<ProductDb_ProductNo_Answer>();
            /// <summary>
            /// Gets pre-config value in TQC pump.
            /// </summary>
            public IEnumerable<ProductDb_ProductNo_Answer> ProductDb_ProductNo_Answers => this.productDb_ProductNo_Answers;


            private List<ProductPerFuellingModeDb_ProductPrice_Answer> productPerFuellingModeDb_ProductPrice_Answers
                = new List<ProductPerFuellingModeDb_ProductPrice_Answer>();
            /// <summary>
            /// Gets pre-config value in TQC pump.
            /// </summary>
            public IEnumerable<ProductPerFuellingModeDb_ProductPrice_Answer> ProductPerFuellingModeDb_ProductPrice_Answers => this.productPerFuellingModeDb_ProductPrice_Answers;


            private Dictionary<int, int> priceBook = new Dictionary<int, int>();
            /// <summary>
            /// Gets or set the init price for each product.
            /// default price init policy is read from pricebook, if found then apply, otherwise use pre-config value read from pump.
            /// should follow->  barcode:rawFormatPriceWithoutDecimalPoints
            /// </summary>
            public Dictionary<int, int> PriceBook => this.priceBook;


            private IEnumerable<NozzleExtraInfo> nozzleProductConfig;
            public IEnumerable<NozzleExtraInfo> NozzleProductConfig
            {
                get
                {
                    return this.nozzleProductConfig;
                }
                set
                {
                    this.nozzleProductConfig = value;
                    this.thisTqcProductBarcodes = this.nozzleProductConfig.Where(n => this.pumpHandlers.Select(p => p.PumpId).Contains(n.PumpId)).Select(s => s.ProductBarcode).Distinct().OrderBy(o => o).ToList();
                    //this.thisTqcProductBarcodes = nozzleProductConfig.Select(s => s.ProductBarcode).Distinct().OrderBy(o => o).ToList();
                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " current TQC local configuration indicates total have "
                        + this.thisTqcProductBarcodes.Count + " product barcodes: " + this.thisTqcProductBarcodes.Select(s => s.ToString()).Aggregate((acc, n) => acc + ", " + n));
                }
            }

            //= Configurator.Default.NozzleProductConfiguration.Mapping;
            private byte ifsfSelfSubnet;
            private byte ifsfSelfNode;
            public byte ifsfRecipientSubnet;
            public byte ifsfRecipientNode;
            public IEnumerable<LonWorksPumpHandler> pumpHandlers;
            Func<byte> msgTokenGenerator;
            private List<int> thisTqcProductBarcodes;

            private Status currentStatus;
            public Status CurrentStatus
            {
                get { return this.currentStatus; }
                set
                {
                    //logger.Debug("PumpInitializer, node " + ifsfRecipientNode + ", Status switched from " + this.currentStatus + " to " + value);
                    this.currentStatus = value;
                }
            }
            //private DateTime previousRequestingTime;
            private byte? pendingForAckMsgToken;
            public enum Status
            {
                UnInit = 0,
                Wait_Answer_Query_All_FuelPointState,
                Wait_Answer_Close_All_FuelPoint,
                Wait_Answer_Query_Caculator_Overall_Info,
                Wait_Answer_Read_All_Nozzle_ProductInfo_PhyId,
                Wait_Answer_Read_All_ProductNumber,
                Wait_Answer_Read_All_ProductPrice,
                //Sending_Add_Recipient_Addr,
                Wait_ACK_Add_Recipient_Addr,
                //Sending_Clear_ProductNumber_In_Caculator,
                Wait_ACK_Clear_ProductNumber_In_ProductDb,
                //Sending_Set_ProductNumber_In_Caculator,
                Wait_ACK_Set_ProductNumber_In_ProductDb,
                //Sending_Link_Meter_To_CaculatorSlot,
                Wait_ACK_Link_Meter_To_ProductDb_ProductNoSlot,
                //Sending_Set_AUTH_MODE,
                Wait_ACK_Set_AUTH_MODE,
                //Sending_Set_Price,
                Wait_ACK_Set_Price,
                //Sending_Set_Nozzle_To_CacalatorSlot,
                Wait_ACK_Set_Nozzle_To_ProductDb_ProductNoSlot,
                //Sending_Set_FP_Default_FuellingMode,
                Wait_ACK_Set_FP_Default_FuellingMode,
                //Send_Open_FP,
                //Wait_ACK_Open_FP,
                Done
            }


            /// <summary>
            /// 
            /// </summary>
            /// <param name="selfSubnet">fc ifsf subnet value</param>
            /// <param name="selfNode">fc ifsf node value</param>
            /// <param name="ifsfRecipientSubnet">remote ifsf recipient subnet value</param>
            /// <param name="ifsfRecipientNode">remote ifsf recipient node value</param>
            /// <param name="pumpHandlers">pump handlers created from the pump Group handler</param>
            /// <param name="msgTokenGenerator"></param>
            public TqcPumpGroupInitializer(byte selfSubnet, byte selfNode, byte ifsfRecipientSubnet, byte ifsfRecipientNode,
                IEnumerable<LonWorksPumpHandler> pumpHandlers, Func<byte> msgTokenGenerator)
            {
                this.ifsfSelfSubnet = selfSubnet;
                this.ifsfSelfNode = selfNode;
                this.ifsfRecipientSubnet = ifsfRecipientSubnet;
                this.ifsfRecipientNode = ifsfRecipientNode;

                this.pumpHandlers = pumpHandlers;
                this.msgTokenGenerator = msgTokenGenerator;

                this.initTimeoutTimer.Elapsed += (a, b) =>
                {
                    this.initTimeoutTimer.Stop();
                    if (!this.IsInitDone)
                    {
                        this.InitDoneTaskCompletionSource.SetResult(false);
                        var safe = this.OnInitTimeout;
                        safe(this, null);
                    }
                };
            }

            private byte next_ActualInPump_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;
            private byte next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;
            //private byte next_Link_Meter_to_ProductNumber_Index = 1;
            private byte next_site_nozzle_Index = 1;

            private byte next_Fp_Index = 1;

            /// <summary>
            /// if it was Done, return false.  otherwise, the init is kicking off, return true.
            /// </summary>
            /// <param name="context"></param>
            /// <returns></returns>
            public bool FeedIn(IContext<byte[], IfsfMessageBase> context)
            {
                if (!this.initTimeoutTimer.Enabled) this.initTimeoutTimer.Start();
                if (IsInitDone) return false;
                switch (this.CurrentStatus)
                {
                    case Status.UnInit:
                        {
                            logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " start Init, firstly Query&Close all FuelPoints...");

                            logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send QueryAllFp state(first time)");
                            this.pendingForAckMsgToken = this.msgTokenGenerator();
                            context.Outgoing.Write(
                            new FuellingPointDbRequest_Read_FuelPointState(this.ifsfRecipientSubnet,
                                    this.ifsfRecipientNode,
                                    this.ifsfSelfSubnet,
                                    this.ifsfSelfNode,
                                    this.pendingForAckMsgToken.Value, 0x20
                                   ));
                            this.CurrentStatus = Status.Wait_Answer_Query_All_FuelPointState;
                            break;
                        }
                    case Status.Wait_Answer_Query_All_FuelPointState:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                  && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                var historyIncoming = context.Incoming as HistoryKeepIncoming<IfsfMessageBase>;
                                this.fpStatus_Answers = historyIncoming.History.Where(h => (h.Item1 is FuellingPointDb_FpStatus_Answer im)
                                    && im.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                                    && im.MessageToken == this.pendingForAckMsgToken)
                                        .Select(s => (FuellingPointDb_FpStatus_Answer)s.Item1).ToList();
                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + ", read total " + fpStatus_Answers.Count
                                    + " Fp status, they're " + this.fpStatus_Answers.Select(s => "Fp 0x" + s.TargetFuelPointId.ToHexLogString() + " is " + s.FuelPointState)
                                        .Aggregate((n, acc) => n + ", " + acc));
                                this.pendingForAckMsgToken = this.msgTokenGenerator();
                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send CloseFuelPoint(first time) for FP: 0x"
                                        + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString());
                                this.pendingForAckMsgToken = this.msgTokenGenerator();
                                context.Outgoing.Write(
                                new FuellingPointDbRequest_Write_CloseFuelPoint(this.ifsfRecipientSubnet,
                                        this.ifsfRecipientNode,
                                        this.ifsfSelfSubnet,
                                        this.ifsfSelfNode,
                                        this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId)
                                       ));
                                this.CurrentStatus = Status.Wait_Answer_Close_All_FuelPoint;
                            }

                            break;
                        }
                    case Status.Wait_Answer_Close_All_FuelPoint:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                       && ifsfMsg.MessageToken == this.pendingForAckMsgToken)
                            {
                                if (++next_Fp_Index <= this.pumpHandlers.Count())
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " CloseFuelPoint Acked");
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send CloseFuelPoint for FP: 0x"
                                        + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString());
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                        new FuellingPointDbRequest_Write_CloseFuelPoint(this.ifsfRecipientSubnet,
                                        this.ifsfRecipientNode,
                                        this.ifsfSelfSubnet,
                                        this.ifsfSelfNode,
                                        this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId)
                                    ));
                                    this.CurrentStatus = Status.Wait_Answer_Close_All_FuelPoint;
                                }
                                else
                                {
                                    this.next_Fp_Index = 1;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending CaculatorDbRequest_Read_FuelPoint_Product_FuelMode_Meter_Info...");
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                        new CaculatorDbRequest_Read_FuelPoint_Product_FuelMode_Meter_Info(this.ifsfRecipientSubnet,
                                            this.ifsfRecipientNode,
                                            this.ifsfSelfSubnet,
                                            this.ifsfSelfNode,
                                            this.pendingForAckMsgToken.Value
                                           ));
                                    this.CurrentStatus = Status.Wait_Answer_Query_Caculator_Overall_Info;
                                }
                            }
                            break;
                        }
                    case Status.Wait_Answer_Query_Caculator_Overall_Info:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                                    && ifsfMsg.MessageToken == this.pendingForAckMsgToken)
                            {
                                var dataParser = DatabaseDataParser.New().Convert(ifsfMsg.RawDatabaseData.ToArray());
                                var numberOfProducts = dataParser.DataIds.First(i => i.Item1 == 0x02).Item2.ToInt32();
                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " CaculatorDbRequest_Read_FuelPoint_Product_FuelMode_Meter_Info Acked,\r\n" +
                                    "Read caculatorDbOverallInfo, No_Products: " + numberOfProducts
                                    + ", No_Fuelling_Modes: " + dataParser.DataIds.First(i => i.Item1 == 0x03).Item2.ToInt32()
                                    + ", No_Meters: " + dataParser.DataIds.First(i => i.Item1 == 0x04).Item2.ToInt32()
                                    + ", No_FP: " + dataParser.DataIds.First(i => i.Item1 == 0x05).Item2.ToInt32()
                                    + ", Auth_State_Mode: " + dataParser.DataIds.First(i => i.Item1 == 0x0B).Item2.ToInt32());
                                if (numberOfProducts != this.thisTqcProductBarcodes.Count)
                                {
                                    logger.LogInformation("!!!!!!PumpInitializer, node " + ifsfRecipientNode + " This TQC MUST config " + numberOfProducts + " products, but now trying to load local config with " + this.thisTqcProductBarcodes.Count + " products");
                                }

                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending CommunicationServiceDbRequest_Write_RecipientAddressTable...");
                                this.pendingForAckMsgToken = this.msgTokenGenerator();
                                context.Outgoing.Write(
                                    new CommunicationServiceDbRequest_Write_RecipientAddressTable(this.ifsfRecipientSubnet,
                                        this.ifsfRecipientNode,
                                        this.ifsfSelfSubnet,
                                        this.ifsfSelfNode,
                                        this.pendingForAckMsgToken.Value,
                                        this.ifsfSelfSubnet,
                                        this.ifsfSelfNode));
                                this.CurrentStatus = Status.Wait_ACK_Add_Recipient_Addr;
                            }

                            break;
                        }
                    case Status.Wait_ACK_Add_Recipient_Addr:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                    && ifsfMsg.MessageToken == this.pendingForAckMsgToken)
                            {
                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " CommunicationServiceDbRequest_Write_RecipientAddressTable Acked.");

                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send LogicalNozzleDb_Read_Nozzle_ProductInfo_PhyId for FP: 0x"
                                    + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString());
                                this.pendingForAckMsgToken = this.msgTokenGenerator();
                                context.Outgoing.Write(
                                    new LogicalNozzleDb_Read_Nozzle_ProductInfo_PhyId(this.ifsfRecipientSubnet,
                                          this.ifsfRecipientNode,
                                          this.ifsfSelfSubnet,
                                          this.ifsfSelfNode,
                                          this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId), 0x10));
                                this.CurrentStatus = Status.Wait_Answer_Read_All_Nozzle_ProductInfo_PhyId;
                            }

                            break;
                        }
                    case Status.Wait_Answer_Read_All_Nozzle_ProductInfo_PhyId:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                               && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                var historyIncoming = context.Incoming as HistoryKeepIncoming<IfsfMessageBase>;
                                this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers.AddRange(
                                    historyIncoming.History.Where(h => (h.Item1 is LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answer im)
                                        && im.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                                        && im.MessageToken == this.pendingForAckMsgToken)
                                            .Select(s => s.Item1 as LogicalNozzleDb_Nozzle_ProductInfo_PhyId_Answer).OrderBy(a => a.LogicalNozzleId));

                                if (++next_Fp_Index <= this.pumpHandlers.Count())
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " LogicalNozzleDb_Read_Nozzle_ProductInfo_PhyId Acked");
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send LogicalNozzleDb_Read_Nozzle_ProductInfo_PhyId for FP: 0x"
                                        + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString());
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                        new LogicalNozzleDb_Read_Nozzle_ProductInfo_PhyId(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId), 0x10));
                                    this.CurrentStatus = Status.Wait_Answer_Read_All_Nozzle_ProductInfo_PhyId;
                                }
                                else
                                {
                                    foreach (var answer in this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers)
                                        logger.LogInformation("       node " + ifsfRecipientNode + " Read nozzles info for FP: 0x" + answer.TargetFuelPointId.ToHexLogString()
                                            + ", with logicalId: 0x" + answer.LogicalNozzleId.ToHexLogString()
                                            + ", with physicalId: 0x" + answer.PhyscialNozzleId.ToHexLogString()
                                            + ", with product slotId: 0x" + answer.LinkedProductSlotId_InProductDbProdcutNoSlot.ToHexLogString());

                                    next_Fp_Index = 1;

                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending ProductDbRequest_Read_ProductNo");
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    // will receive several answers and an ACK messages since this is a query all request.
                                    context.Outgoing.Write(new ProductDbRequest_Read_ProductNo(this.ifsfRecipientSubnet,
                                                  this.ifsfRecipientNode,
                                                  this.ifsfSelfSubnet,
                                                  this.ifsfSelfNode,
                                                  this.pendingForAckMsgToken.Value, 0));
                                    this.CurrentStatus = Status.Wait_Answer_Read_All_ProductNumber;
                                }
                            }
                            break;
                        }
                    case Status.Wait_Answer_Read_All_ProductNumber:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                    && ifsfMsg.MessageToken == this.pendingForAckMsgToken)
                            {
                                var historyIncoming = context.Incoming as HistoryKeepIncoming<IfsfMessageBase>;
                                //logger.Debug("************" + historyIncoming.History.Select(a => a.Item1.GetType().Name).Aggregate((acc, n) => acc + ", " + n));
                                //logger.Debug("************historyIncoming.History.Count: " + historyIncoming.History.Count);
                                this.productDb_ProductNo_Answers.AddRange(
                                    historyIncoming.History.Where(h => (h.Item1 is ProductDb_ProductNo_Answer im)
                                        && im.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                                        && im.MessageToken == this.pendingForAckMsgToken).Select(s => s.Item1 as ProductDb_ProductNo_Answer).OrderBy(a => a.ProductSlotId));
                                if (this.productDb_ProductNo_Answers.Any())
                                {
                                    logger.LogInformation("       node " + ifsfRecipientNode + " Read all existed product number in a TQC which are: " + this.productDb_ProductNo_Answers.Select(s => s.ProductNumber + "(in 0x" + s.ProductSlotId.ToHexLogString() + ")").Aggregate((acc, n) => acc + ", " + n));
                                    string actualProductNumber = this.productDb_ProductNo_Answers.ElementAt(this.next_ActualInPump_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1).ProductNumber;//this.siteProductBarcodes[next_Clear_ProductNumber_In_Caculator_SlotIndex - 1].ToString();
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    // each Product will receive a serial of answers for its differnt FuelMode since we input 0x10 as query all FM.
                                    context.Outgoing.Write(new ProductPerFuellingModeDbRequest_Read_ProductPrice(this.ifsfRecipientSubnet,
                                                  this.ifsfRecipientNode,
                                                  this.ifsfSelfSubnet,
                                                  this.ifsfSelfNode,
                                                  this.pendingForAckMsgToken.Value, actualProductNumber, 0x10));
                                    this.CurrentStatus = Status.Wait_Answer_Read_All_ProductPrice;
                                }
                                else
                                {
                                    /* TQC without any product configed, happened for fresh new TQC pump (get hardware reset or just shipped from factory??), handle here */
                                    logger.LogInformation("   node " + ifsfRecipientNode + " has no ProductDb_ProductNo_Answer received, seems there're no product configurated in this TQC yet, will directly Clear Set_ProductNumber_In_ProductDb");
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending Clear ProductNumber in ProductDb slot index: " + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index);

                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index, null));
                                    this.CurrentStatus = Status.Wait_ACK_Set_ProductNumber_In_ProductDb;
                                }
                            }

                            break;
                        }
                    case Status.Wait_Answer_Read_All_ProductPrice:
                        {
                            if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                   && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                var historyIncoming = context.Incoming as HistoryKeepIncoming<IfsfMessageBase>;
                                var resultSetsForOneProduct = historyIncoming.History.Where(h => (h.Item1 is ProductPerFuellingModeDb_ProductPrice_Answer im)
                                         && im.MessageType == MessageType.IFSF_MESSAGE_TYPE_ANSWER
                                         && im.MessageToken == this.pendingForAckMsgToken).Select(s => s.Item1 as ProductPerFuellingModeDb_ProductPrice_Answer);
                                logger.LogInformation("   node " + ifsfRecipientNode + ", Read one existed product price with product number: "
                                    + resultSetsForOneProduct.Last().ProductNumber
                                  + ", price are: " + resultSetsForOneProduct.OrderBy(a => a.FuelModeId).Select(s => s.Price + " in FM:0x" + s.FuelModeId.ToString("X")).Aggregate((acc, n) => acc + ", " + n));

                                this.productPerFuellingModeDb_ProductPrice_Answers.AddRange(resultSetsForOneProduct);

                                if (this.productDb_ProductNo_Answers.Count() >= ++next_ActualInPump_ProductNumber_In_ProductDb_ProductNoSlot_Index)
                                {
                                    string actualProductNumber = this.productDb_ProductNo_Answers.ElementAt(this.next_ActualInPump_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1).ProductNumber;//this.siteProductBarcodes[next_Clear_ProductNumber_In_Caculator_SlotIndex - 1].ToString();
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(new ProductPerFuellingModeDbRequest_Read_ProductPrice(this.ifsfRecipientSubnet,
                                                  this.ifsfRecipientNode,
                                                  this.ifsfSelfSubnet,
                                                  this.ifsfSelfNode,
                                                  this.pendingForAckMsgToken.Value, actualProductNumber, 0x10));
                                    this.CurrentStatus = Status.Wait_Answer_Read_All_ProductPrice;
                                }
                                else
                                {
                                    next_ActualInPump_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Read_All_ProductPrice done!");
                                    var safe = this.OnTqcExistedConfigRead;
                                    safe?.Invoke(this, null);

                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending Clear productNo(1st time) in ProductDb with slot index: " + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index);

                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index, null));
                                    this.CurrentStatus = Status.Wait_ACK_Clear_ProductNumber_In_ProductDb;
                                }
                            }

                            break;
                        }

                    case Status.Wait_ACK_Clear_ProductNumber_In_ProductDb:
                        {
                            if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                if (ifsfMsg.OverallStatus != MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                                    logger.LogError("   node " + ifsfRecipientNode + ", clear product from ProductDb failed!");
                                logger.LogInformation("      PumpInitializer, node " + ifsfRecipientNode + ", clear product no. from ProductDb with msgToken:" + this.pendingForAckMsgToken.Value + " Acked.");
                                if (++next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index <= 8)
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending Clear productNo in ProductDb with slot index: " + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index);

                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index, null));
                                    this.CurrentStatus = Status.Wait_ACK_Clear_ProductNumber_In_ProductDb;
                                }
                                else
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " clear product number on all productDb productNo slots(total:" + (next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1) + ") done!");

                                    next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;

                                    var next_site_nozzle = this.pumpHandlers.SelectMany(p => p.Nozzles)
                                        .OrderBy(n => n.PumpId).OrderBy(n => n.LogicalId).ElementAt(next_site_nozzle_Index - 1);
                                    var nozzleProductConfig = this.nozzleProductConfig
                                         .First(c => c.PumpId == next_site_nozzle.PumpId && c.NozzleLogicalId == next_site_nozzle.LogicalId);
                                    var ifsfNozzle
                                       = this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers
                                           .First(ifsfNzl => ifsfNzl.TargetFuelPointId == this.pumpHandlers.First(p => p.PumpId == next_site_nozzle.PumpId).PumpPhysicalId
                                               && ifsfNzl.LogicalNozzleId == next_site_nozzle.PhysicalId);
                                    var nozzleBoundToProductDbProductSlot = ifsfNozzle.LinkedProductSlotId_InProductDbProdcutNoSlot;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode
                                        + " pump " + next_site_nozzle.PumpId + ", nozzle logicalId " + next_site_nozzle.LogicalId
                                        + "(ifsf FpId 0x" + ifsfNozzle.TargetFuelPointId.ToHexLogString() + ", ifsf nozzle logicalId 0x" + ifsfNozzle.LogicalNozzleId.ToHexLogString() + ")"
                                        + " is hardware-bound to productDb product No. slot 0x" + nozzleBoundToProductDbProductSlot.ToHexLogString()
                                        + ", will(1st time) set 0x" + nozzleBoundToProductDbProductSlot.ToHexLogString() + " to product No.: " + nozzleProductConfig.ProductBarcode);
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              (byte)(nozzleBoundToProductDbProductSlot - 0x40), nozzleProductConfig.ProductBarcode.ToString()));
                                    this.CurrentStatus = Status.Wait_ACK_Set_ProductNumber_In_ProductDb;
                                }
                            }

                            break;
                        }

                    case Status.Wait_ACK_Set_ProductNumber_In_ProductDb:
                        {
                            if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                if (ifsfMsg.OverallStatus != MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                                    logger.LogError("   node " + ifsfRecipientNode + ", set product to ProductDb failed!");
                                logger.LogInformation("      PumpInitializer, node " + ifsfRecipientNode + " ProductDbRequest_Write_SetProductNumber with msgToken:" + this.pendingForAckMsgToken.Value + " Acked.");
                                if (++next_site_nozzle_Index <= this.pumpHandlers.SelectMany(p => p.Nozzles).Count())
                                {
                                    var next_site_nozzle = this.pumpHandlers.SelectMany(p => p.Nozzles)
                                        .OrderBy(n => n.PumpId).OrderBy(n => n.LogicalId).ElementAt(next_site_nozzle_Index - 1);
                                    var nozzleProductConfig = this.nozzleProductConfig
                                         .First(c => c.PumpId == next_site_nozzle.PumpId && c.NozzleLogicalId == next_site_nozzle.LogicalId);
                                    var ifsfNozzle
                                        = this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers
                                            .First(ifsfNzl => ifsfNzl.TargetFuelPointId == this.pumpHandlers.First(p => p.PumpId == next_site_nozzle.PumpId).PumpPhysicalId
                                                && ifsfNzl.LogicalNozzleId == next_site_nozzle.PhysicalId);
                                    var nozzleBoundToProductDbProductSlot = ifsfNozzle.LinkedProductSlotId_InProductDbProdcutNoSlot;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode
                                        + " pump " + next_site_nozzle.PumpId + ", nozzle logicalId " + next_site_nozzle.LogicalId
                                        + "(ifsf FpId 0x" + ifsfNozzle.TargetFuelPointId.ToHexLogString() + ", ifsf nozzle logicalId 0x" + ifsfNozzle.LogicalNozzleId.ToHexLogString() + ")"
                                        + " is hardware-bound to productDb product No. slot 0x" + nozzleBoundToProductDbProductSlot.ToHexLogString()
                                        + ", will set 0x" + nozzleBoundToProductDbProductSlot.ToHexLogString() + " to product No.: " + nozzleProductConfig.ProductBarcode);
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              (byte)(nozzleBoundToProductDbProductSlot - 0x40), nozzleProductConfig.ProductBarcode.ToString()));
                                    this.CurrentStatus = Status.Wait_ACK_Set_ProductNumber_In_ProductDb;
                                }
                                else
                                {
                                    next_site_nozzle_Index = 1;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending CaculatorDbRequest_Write_Set_AuthStateMode_MinFuelingVol_MinDisplayVol");
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                          new CaculatorDbRequest_Write_Set_AuthStateMode_MinFuelingVol_MinDisplayVol(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value,
                                              CaculatorDbRequest_Write_Set_AuthStateMode_MinFuelingVol_MinDisplayVol.Caculator_Auth_State_Mode.AUTH_State_Allowed));
                                    this.CurrentStatus = Status.Wait_ACK_Set_AUTH_MODE;
                                }
                                //if (++next_Clear_ProductNumber_In_Caculator_SlotIndex <= 8)
                                //this.CurrentStatus = Status.Sending_Link_Meter_To_CaculatorSlot;

                                //logger.Info("PumpInitializer, node " + ifsfRecipientNode + " sending MeterDbRequest_Write_SetMesureToProduct(first), meterId: "
                                //        + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index + ", 2nd arg: " + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index);
                                //this.pendingForAckMsgToken = this.msgTokenGenerator();
                                //context.Outgoing.Write(
                                //      new MeterDbRequest_Write_SetMesureToProduct(this.ifsfRecipientSubnet,
                                //          this.ifsfRecipientNode,
                                //          this.ifsfSelfSubnet,
                                //          this.ifsfSelfNode,
                                //          this.pendingForAckMsgToken.Value,
                                //          next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index,
                                //           next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index));
                                //this.CurrentStatus = Status.Wait_ACK_Link_Meter_To_ProductDb_ProductNoSlot;
                            }
                            break;
                        }
                    //case Status.Wait_ACK_Link_Meter_To_ProductDb_ProductNoSlot:
                    //    {
                    //        if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                    //            && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                    //        {
                    //            if (ifsfMsg.OverallStatus != MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                    //                logger.Error("   node " + ifsfRecipientNode + ", link meter to ProductDb failed!");
                    //            logger.Info("      PumpInitializer, MeterDbRequest_Write_SetMesureToProduct with msgToken:" + this.pendingForAckMsgToken.Value + " Acked.");
                    //            if (this.thisTqcProductBarcodes.Count >= ++next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index)
                    //            {
                    //                //this.CurrentStatus = Status.Sending_Set_ProductNumber_In_Caculator;
                    //                this.pendingForAckMsgToken = this.msgTokenGenerator();
                    //                // put 91 to 98 to caculator 8 slots.
                    //                string operatingProductNumber = this.thisTqcProductBarcodes[next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1].ToString();
                    //                logger.Info("PumpInitializer, node " + ifsfRecipientNode + " sending ProductDbRequest_Write_SetProductNumber, ProductDb ProductNoSlot: "
                    //                                                        + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index + ", productNo: " + operatingProductNumber);
                    //                context.Outgoing.Write(
                    //                      new ProductDbRequest_Write_SetProductNumber(this.ifsfRecipientSubnet,
                    //                          this.ifsfRecipientNode,
                    //                          this.ifsfSelfSubnet,
                    //                          this.ifsfSelfNode,
                    //                          this.pendingForAckMsgToken.Value,
                    //                          next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index, operatingProductNumber));
                    //                this.CurrentStatus = Status.Wait_ACK_Set_ProductNumber_In_ProductDb;
                    //            }
                    //            else
                    //            {
                    //                next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;
                    //                logger.Info("PumpInitializer, node " + ifsfRecipientNode + " Link_Meter_To_ProductDb_ProductNoSlot done!");
                    //                //this.CurrentStatus = Status.Sending_Set_AUTH_MODE;


                    //            }
                    //        }
                    //        break;
                    //    }

                    case Status.Wait_ACK_Set_AUTH_MODE:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " CaculatorDbRequest_Write_Set_AuthStateMode_MinFuelingVol_MinDisplayVol Acked.");

                                var targetBarcode = this.thisTqcProductBarcodes[next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1];
                                int newInitPriceWithoutDecimalPoints;
                                if (this.PriceBook.ContainsKey(targetBarcode))
                                    newInitPriceWithoutDecimalPoints = this.PriceBook[targetBarcode];
                                else
                                {
                                    // try load the existed pre-configed price value which just read from TQC pump.
                                    var preConfigedPriceOnPump = this.productPerFuellingModeDb_ProductPrice_Answers.FirstOrDefault(p => p.FuelModeId == 0x11 && p.ProductNumber == targetBarcode.ToString().PadLeft(8, '0'))?.Price;
                                    if (string.IsNullOrEmpty(preConfigedPriceOnPump))
                                        newInitPriceWithoutDecimalPoints = 1883 + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index;
                                    else
                                        newInitPriceWithoutDecimalPoints = int.Parse(preConfigedPriceOnPump);
                                    this.PriceBook.Add(targetBarcode, newInitPriceWithoutDecimalPoints);
                                }

                                logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending ProductPerFuellingModeDbRequest_Write_SetPrice, productNo: "
                                    + targetBarcode.ToString()
                                    + ", new price(without decimalPoints): " + newInitPriceWithoutDecimalPoints.ToString());

                                this.pendingForAckMsgToken = this.msgTokenGenerator();
                                context.Outgoing.Write(
                                      new ProductPerFuellingModeDbRequest_Write_SetPrice(this.ifsfRecipientSubnet,
                                          this.ifsfRecipientNode,
                                          this.ifsfSelfSubnet,
                                          this.ifsfSelfNode,
                                          this.pendingForAckMsgToken.Value,
                                          targetBarcode.ToString(), newInitPriceWithoutDecimalPoints.ToString()
                                          , 0x11)
                                          );
                                this.CurrentStatus = Status.Wait_ACK_Set_Price;
                            }

                            break;
                        }
                    case Status.Wait_ACK_Set_Price:
                        {
                            if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                if (ifsfMsg.OverallStatus != MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                                    logger.LogError("   node " + ifsfRecipientNode + ", set price for product failed!");
                                if (this.thisTqcProductBarcodes.Count >= ++next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index)
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " ProductPerFuellingModeDbRequest_Write_SetPrice Acked.");

                                    var targetBarcode = this.thisTqcProductBarcodes[next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index - 1];
                                    int newInitPriceWithoutDecimalPoints;
                                    if (this.PriceBook != null && this.PriceBook.ContainsKey(targetBarcode))
                                        newInitPriceWithoutDecimalPoints = this.PriceBook[targetBarcode];
                                    else
                                    {
                                        // try load the existed pre-configed price value which just read from TQC pump.
                                        var preConfigedPriceOnPump = this.productPerFuellingModeDb_ProductPrice_Answers.FirstOrDefault(p => p.FuelModeId == 0x11 && p.ProductNumber == targetBarcode.ToString().PadLeft(8, '0'))?.Price;
                                        if (string.IsNullOrEmpty(preConfigedPriceOnPump))
                                            newInitPriceWithoutDecimalPoints = 1883 + next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index;
                                        else
                                            newInitPriceWithoutDecimalPoints = int.Parse(preConfigedPriceOnPump);
                                        this.PriceBook.Add(targetBarcode, newInitPriceWithoutDecimalPoints);
                                    }

                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " sending ProductPerFuellingModeDbRequest_Write_SetPrice, productNo: "
                                        + targetBarcode.ToString()
                                        + ", new price(without decimalPoints): " + newInitPriceWithoutDecimalPoints.ToString());

                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    //logger.Info("PumpInitializer, node "+ifsfRecipientNode+" will set product: " + this.siteProductBarcodes[next_Clear_ProductNumber_In_Caculator_SlotIndex - 1].ToString() + " with price " + (1883 + next_Clear_ProductNumber_In_Caculator_SlotIndex).ToString());
                                    context.Outgoing.Write(
                                          new ProductPerFuellingModeDbRequest_Write_SetPrice(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value, targetBarcode.ToString(), newInitPriceWithoutDecimalPoints.ToString(), 0x11)
                                              );
                                    this.CurrentStatus = Status.Wait_ACK_Set_Price;
                                }
                                else
                                {
                                    next_Clear_ProductNumber_In_ProductDb_ProductNoSlot_Index = 1;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " set product Price(8 products) in fuel mode 0x11 done!");
                                    //this.CurrentStatus = Status.Sending_Set_Nozzle_To_CacalatorSlot;

                                    // now we only have fuelling mode 0x11.
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send FuellingPointDbRequest_Write_SetDefaultFuellingMode,\r\n" +
                                        "FP: 0x" + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString() + " set to fuelling mode 0x11");
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                        new FuellingPointDbRequest_Write_SetDefaultFuellingMode(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId), 1));
                                    this.CurrentStatus = Status.Wait_ACK_Set_FP_Default_FuellingMode;
                                }
                            }

                            break;
                        }
                    //case Status.Wait_ACK_Set_Nozzle_To_ProductDb_ProductNoSlot:
                    //    {
                    //        if (context.Incoming.Message is AcknowledgeMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                    //            && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                    //        {
                    //            if (ifsfMsg.OverallStatus != MessageAcknowledgeStatus.ACK_PositiveAcknowledgeDataReceived)
                    //                logger.Error("   node " + ifsfRecipientNode + ", set nozzle to ProductDb failed:\r\n " + ifsfMsg.ToLogString());
                    //            if (++next_site_nozzle_Index <= this.pumpHandlers.SelectMany(p => p.Nozzles).Count())
                    //            {
                    //                logger.Info("PumpInitializer, node " + ifsfRecipientNode + " LogicalNozzleDb_Write_SetNozzleProductAndMeter Acked.");
                    //                var next_site_nozzle = this.pumpHandlers.SelectMany(p => p.Nozzles).ElementAt(next_site_nozzle_Index - 1);
                    //                var productOnThisNozzleSitsInWhichCaculatorSlot =
                    //                    thisTqcProductBarcodes.IndexOf(nozzleProductConfig.First(p => p.NozzleLogicalId == next_site_nozzle.LogicalId && p.PumpId == next_site_nozzle.PumpId).ProductBarcode) + 1;
                    //                this.pendingForAckMsgToken = this.msgTokenGenerator();
                    //                byte targetIfsfFpId = this.pumpHandlers.First(p => p.PumpId == next_site_nozzle.PumpId).ifsfFuelPointId;
                    //                byte targetIfsfNozzleId = ((byte)(0x11 + next_site_nozzle.LogicalId - 1));
                    //                logger.Info("PumpInitializer, node " + ifsfRecipientNode + " sending LogicalNozzleDb_Write_SetNozzleProductAndMeter,\r\n" +
                    //                    "set product to nozzle, FP: 0x" + targetIfsfFpId.ToHexLogString()
                    //                    + ", nozzle: 0x" + targetIfsfNozzleId.ToHexLogString()
                    //                    + ", PumpId: " + next_site_nozzle.PumpId + " map to ProductDb ProductNo Slot: " + productOnThisNozzleSitsInWhichCaculatorSlot);
                    //                context.Outgoing.Write(
                    //                      new LogicalNozzleDb_Write_SetNozzleProductAndMeter(this.ifsfRecipientSubnet,
                    //                          this.ifsfRecipientNode,
                    //                          this.ifsfSelfSubnet,
                    //                          this.ifsfSelfNode,
                    //                          this.pendingForAckMsgToken.Value,
                    //                          targetIfsfFpId
                    //                          //assume logical id is 1 based.
                    //                          , targetIfsfNozzleId,
                    //                          (byte)productOnThisNozzleSitsInWhichCaculatorSlot, 1)
                    //                          );
                    //                this.CurrentStatus = Status.Wait_ACK_Set_Nozzle_To_ProductDb_ProductNoSlot;
                    //            }
                    //            else
                    //            {
                    //                next_site_nozzle_Index = 1;
                    //                logger.Info("PumpInitializer, node " + ifsfRecipientNode + " set fp nozzles to ProductDb ProductNo Slot done!");


                    //            }
                    //        }

                    //        break;
                    //    }
                    case Status.Wait_ACK_Set_FP_Default_FuellingMode:
                        {
                            if (context.Incoming.Message is IfsfMessage ifsfMsg && ifsfMsg.MessageType == MessageType.IFSF_MESSAGE_TYPE_ACK
                                && ifsfMsg.MessageToken == this.pendingForAckMsgToken.Value)
                            {
                                if (++next_Fp_Index <= this.pumpHandlers.Count())
                                {
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " FuellingPointDbRequest_Write_SetDefaultFuellingMode Acked");


                                    // now we only have fuelling mode 0x11.
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " Send FuellingPointDbRequest_Write_SetDefaultFuellingMode,\r\n" +
                                        "FP Default fuelling mode, FP: 0x" + this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId.ToHexLogString());
                                    this.pendingForAckMsgToken = this.msgTokenGenerator();
                                    context.Outgoing.Write(
                                        new FuellingPointDbRequest_Write_SetDefaultFuellingMode(this.ifsfRecipientSubnet,
                                              this.ifsfRecipientNode,
                                              this.ifsfSelfSubnet,
                                              this.ifsfSelfNode,
                                              this.pendingForAckMsgToken.Value, (byte)(this.pumpHandlers.ElementAt(next_Fp_Index - 1).PumpPhysicalId), 1));
                                    this.CurrentStatus = Status.Wait_ACK_Set_FP_Default_FuellingMode;
                                }
                                else
                                {
                                    next_Fp_Index = 1;
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " set fp default fuelling mode all done!");
                                    logger.LogInformation("PumpInitializer, node " + ifsfRecipientNode + " DONE!!!");
                                    this.InitDoneTaskCompletionSource.SetResult(true);
                                    this.CurrentStatus = Status.Done;
                                    var safe = this.OnInitDone;
                                    safe?.Invoke(this, null);
                                }
                            }

                            break;
                        }
                }

                return true;
            }

            public bool IsInitDone => this.CurrentStatus == Status.Done;

            public void Reset()
            {
                this.CurrentStatus = Status.UnInit;
                this.initTimeoutTimer.Stop();
                this.InitDoneTaskCompletionSource = new TaskCompletionSource<bool>();
                this.logicalNozzleDb_Nozzle_ProductInfo_PhyId_Answers.Clear();
                this.productDb_ProductNo_Answers.Clear();
                this.productPerFuellingModeDb_ProductPrice_Answers.Clear();
            }
        }

        #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).
                    this.pumpIfsfNodeOfflineCheckTimer?.Stop();
                    this.fccHeartbeatSendingTimer?.Stop();
                }

                // 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);
        }

        IEnumerator<IFdcPumpController> IEnumerable<IFdcPumpController>.GetEnumerator()
        {
            return this.pumpHandlers.GetEnumerator();
        }

        #endregion

    }
}