using System;
using System.Linq;
using System.Collections.Generic;
using Edge.Core.Processor;using Edge.Core.IndustryStandardInterface.Pump;
using Dfs.WayneChina.SpsDbModels.Models;
using Dfs.WayneChina.HengshanTerminalWrapper;
using Dfs.WayneChina.HengshanTerminalWrapper.MessageEntity.Base;
using Dfs.WayneChina.HengshanTerminalWrapper.MessageEntity.Incoming;
using Dfs.WayneChina.HengshanTerminalWrapper.MessageEntity.Outgoing;
using Edge.Core.Database;
using Edge.Core.Database.Models;
using Wayne.FDCPOSLibrary;
using Dfs.WayneChina.CardTrxManager.TrxScanner;
using Dfs.WayneChina.CardTrxManager.TrxSubmitter;
using Dfs.WayneChina.HengshanPos.Model;
using Applications.FDC;
using Dfs.WayneChina.HengshanFPos.FPosDbManager.Model;
using Dfs.WayneChina.HengshanFPos.FPosDbManager;
using FdcServerHost;
using Dfs.WayneChina.CardTrxManager;
using System.Timers;
using System.Threading;
using Dfs.WayneChina.HyperPrinterHandler;
using System.Threading.Tasks;

namespace Dfs.WayneChina.HengshanPos
{
    /// <summary>
    /// A retrofit of Hengshan iPOS (or EPS/后台), manages forecourt fuel sale transactions.
    /// </summary>
    public class HengshanPosApp : IAppProcessor
    {
        #region Properties

        //IProcessor property
        public Guid Id => Guid.Parse("D7E68991-E77A-432C-A2ED-19541FE45E7C");
        
        public string MetaConfigName { get; set; }
        public CampaignEngine CampaignEngine { get; private set; }

        #endregion

        #region Fields

        private FdcServerHostApp fdcServerApp;
        private IEnumerable<IFdcPumpController> fdcPumpControllers;
        private IEnumerable<IDeviceHandler<byte[], NonCardDispenserMessageTemplateBase>> hengshanTerminalHandlers;

        private FPosDbManager fPosDbManager;

        private TrxScanner trxScanner;
        private TrxSubmitter trxSubmitter;

        private static NLog.Logger logger = NLog.LogManager.LoadConfiguration("NLog.config").GetLogger("HengshanPos");
        private static NLog.Logger alarmLogger = NLog.LogManager.LoadConfiguration("NLog.config").GetLogger("Alarm");

        private Dictionary<(int, int), int> nozzles = new Dictionary<(int, int), int>();

        private Dictionary<int, FuelingManager> fuelingManagers = new Dictionary<int, FuelingManager>();
        private List<TrxSubmitter> trxSubmitters = new List<TrxSubmitter>();

        private SqliteDbContext fdcDbContext;
        private FPosDbContext fPosDbContext;

        private bool started = false;

        private object syncObjQueue = new object();
        private Queue<FPosTransaction> trxQueue = new Queue<FPosTransaction>();

        private CloudCredential cloudCredential;

        private System.Timers.Timer sfScanTimer;

        private PrinterHandler printerHandler;

        private Dictionary<int, ManualResetEvent> mreDict = new Dictionary<int, ManualResetEvent>();

        #endregion

        #region Constructor

        public HengshanPosApp(string otherParameter, string discountConfig, string enableSFScan, 
            string username, string password, string authServiceBaseUrl, string transactionServiceBaseUrl, string deviceSN)
        {
            //this.logger = LogManager.GetLogger("DynamicPrivate_" + privateLogFileName);
            Console.ForegroundColor = ConsoleColor.Green;

            CampaignEngine = new CampaignEngine(discountConfig);

            cloudCredential = new CloudCredential
            {
                UserName = username,
                Password = password,
                AuthServiceBaseUrl = authServiceBaseUrl,
                TransactionServiceBaseUrl = transactionServiceBaseUrl,
                DeviceSN = deviceSN
            };

            fdcDbContext = new SqliteDbContext();
            fPosDbContext = new FPosDbContext();
            fPosDbManager = new FPosDbManager(fPosDbContext);

            trxScanner = new TrxScanner(fPosDbManager);
            trxSubmitter = new TrxSubmitter(0, fPosDbManager, cloudCredential);

            //Startup check
            IEnumerable<FPosTransaction> toBeSubmittedTrxs;

            if (!started)
            {
                toBeSubmittedTrxs = GetUnsubmittedTrxsAfterStartup();
                foreach (var t in toBeSubmittedTrxs)
                {
                    lock (syncObjQueue)
                    {
                        logger.Info("Enqueue trx after startup");
                        trxQueue.Enqueue(t);
                    }
                }

                started = true;
            }

            //sfScanTimer = new System.Timers.Timer();
            //sfScanTimer.Elapsed += new ElapsedEventHandler(Eplased);
            //// Set it to go off every 20 seconds
            //sfScanTimer.Interval = 10 * 1000;
            //sfScanTimer.Enabled = true;

            bool sfScanEnabled = Convert.ToBoolean(enableSFScan);
            if (sfScanEnabled)
            {
                RegularScanTask.Run(new Action(PeriodicScan), TimeSpan.FromSeconds(20));
            }

            Console.WriteLine("HengshanPos APP STARTED...");
        }

        private void Eplased(object sender, ElapsedEventArgs e)
        {
            string receipt = "\r\n\r\n<table width=\"95%\" border=\"0\" align=\"center\" style=\"table-layout:fixed;margin-top:50px;font-family:monospace;font-size:15px\">\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\"></td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"2\" align=\"left\">小票编号：</td>\r\n    <td colspan=\"2\" align=\"left\">I1204102726</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"1\" align=\"left\">日期时间</td>\r\n    <td colspan=\"3\" align=\"right\">2018-12-04 10:27:25</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\" style=\"word-break:keep-all;white-space:nowrap;overflow:hidden\">------------------------------</td>\r\n  </tr>\r\n  <tr>\r\n    <td width=\"25%\" align=\"left\">名称</td>\r\n    <td width=\"25%\" align=\"left\">数量</td>\r\n    <td width=\"25%\" align=\"left\">单价</td>\r\n    <td width=\"25%\" align=\"left\">总额</td>\r\n  </tr>\r\n  <tr>\r\n    <td width=\"25%\" align=\"left\">92#</td>\r\n       <td width=\"25%\" align=\"left\">0.39</td>\r\n    <td width=\"25%\" align=\"left\">7.70</td>\r\n   <td width=\"25%\" align=\"left\">3.00</td>\r\n  </tr>\r\n   <tr>   \r\n\t<td colspan=\"4\" align=\"left\">枪号：\r\n        4\r\n\t</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\"> </td>\r\n  </tr>\r\n  <tr>\r\n    <td width=\"75%\" align=\"left\">折扣：</td>\r\n    <td width=\"25%\" align=\"left\">0.06</td>\r\n  </tr>\r\n  <tr>\r\n    <td width=\"75%\" align=\"left\">共计：</td>\r\n    <td width=\"25%\" align=\"left\">2.94</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\" style=\"word-break:keep-all;white-space:nowrap;overflow:hidden\">------------------------------</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"2\" align=\"left\">支付方式</td>\r\n    <td colspan=\"1\" align=\"center\">收款</td>\r\n    <td colspan=\"1\" align=\"right\">找零</td>\r\n  </tr>\r\n    <tr>\r\n    <td colspan=\"2\" align=\"left\">充值卡</td>\r\n    <td colspan=\"1\" align=\"center\">2.94</td>\r\n    <td colspan=\"1\" align=\"right\">0.00</td>\r\n  </tr>\r\n\t<tr>\r\n\t  <td colspan=\"2\" align=\"left\">卡号：</td>\r\n\t  <td colspan=\"2\" align=\"left\">10010557</td>\r\n\t</tr>\t  \r\n\t<tr>\r\n\t  <td colspan=\"2\" align=\"left\">卡余额：</td>\r\n\t  <td colspan=\"2\" align=\"left\">6085.28</td>\r\n\t</tr>  \r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\" style=\"word-break:keep-all;white-space:nowrap;overflow:hidden\">------------------------------</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\">祝您愉快</td>\r\n  </tr>\r\n  <tr>\r\n    <td colspan=\"4\" align=\"center\">欢迎下次光临</td>\r\n  </tr>\r\n</table>\r\n\r\n";
            if (printerHandler != null)
                printerHandler.SendFormattedReceipt(4, receipt);
        }

        private IEnumerable<FPosTransaction> GetUnsubmittedTrxsAfterStartup()
        {
            return fPosDbContext.FPosTransactions.Where(t => t.Submitted == false && t.CardType == 3);
        }

        #endregion

        #region Background scanning

        private void PeriodicScan()
        {
            logger.Info("Periodic scanning started...");
            lock (syncObjQueue)
            {
                if (trxQueue.Count > 0)
                {
                    logger.Info("Pending transaction to be submitted to cloud!");

                    var outTrx = trxQueue.Dequeue();

                    var fdcTransaction = fdcDbContext.PumpTransactionModels.FirstOrDefault(m => m.ReleaseToken == outTrx.ReleaseToken);

                    if (fdcTransaction != null)
                    {
                        logger.Info($"Fdc Transaction exists, ask scanner to find it."
                           + $" pumpId: {outTrx.PumpId},"
                           + $" nozzleId:{outTrx.NozzleId},"
                           + $" FPos SqNo:{outTrx.FPosSqNo},"
                           + $" FC SqNo:{outTrx.FcSqNo}");

                        trxScanner.StartScanAsync(outTrx.PumpId, outTrx.FPosSqNo, outTrx.FcSqNo, outTrx.ReleaseToken,
                            new FdcTransaction
                            {
                                Finished = true,
                                Nozzle = new LogicalNozzle(outTrx.PumpId, 0, Convert.ToByte(outTrx.NozzleId), null),
                                Barcode = Convert.ToInt32(fdcTransaction.ProductBarcode),
                                Volumn = fdcTransaction.Volumn,
                                Price = fdcTransaction.UnitPrice,
                                Amount = fdcTransaction.Amount,
                                VolumeTotalizer = fdcTransaction.VolumeTotalizer,
                                AmountTotalizer = fdcTransaction.AmountTotalizer,
                                SequenceNumberGeneratedOnPhysicalPump = Convert.ToInt32(fdcTransaction.TransactionSeqNumberFromPhysicalPump),
                            });
                    }
                }
            }

            var unsubmittedTransaction = fPosDbContext.FPosTransactions
                .Where(t => t.Reserved == false && t.Submitted == false && t.CardType == 3);

            if (unsubmittedTransaction.Count() > 0)
            {
                logger.Info("Found not reserved and unsubmitted transactions");

                var oldestTrx = unsubmittedTransaction.OrderBy(t => t.Id).FirstOrDefault();

                if (oldestTrx != null)
                {
                    var fdcTransaction = fdcDbContext.PumpTransactionModels.FirstOrDefault(m => m.ReleaseToken == oldestTrx.ReleaseToken);

                    if (fdcTransaction != null)
                    {
                        logger.Info($"Fdc Transaction exists, ask scanner to find it."
                            + $" pumpId: {oldestTrx.PumpId},"
                            + $" nozzleId:{oldestTrx.NozzleId},"
                            + $" FPos SqNo:{oldestTrx.FPosSqNo},"
                            + $" FC SqNo:{oldestTrx.FcSqNo}");

                        trxScanner.StartScanAsync(oldestTrx.PumpId, oldestTrx.FPosSqNo, oldestTrx.FcSqNo, oldestTrx.ReleaseToken,
                            new FdcTransaction
                            {
                                Finished = true,
                                Nozzle = new LogicalNozzle(oldestTrx.PumpId, 0, Convert.ToByte(oldestTrx.NozzleId), null),
                                Barcode = Convert.ToInt32(fdcTransaction.ProductBarcode),
                                Volumn = fdcTransaction.Volumn,
                                Price = fdcTransaction.UnitPrice,
                                Amount = fdcTransaction.Amount,
                                VolumeTotalizer = fdcTransaction.VolumeTotalizer,
                                AmountTotalizer = fdcTransaction.AmountTotalizer,
                                SequenceNumberGeneratedOnPhysicalPump = Convert.ToInt32(fdcTransaction.TransactionSeqNumberFromPhysicalPump),
                            });
                    }
                }
            }
            else
            {
                logger.Info("Have not found any transaction that are NOT reserved and unsbumitted");
            }
        }

        #endregion

        #region Init

        //IApplication method implementation
        public void Init(IEnumerable<IProcessor> processors)
        {
            InfoLog("HengshanPosApp Init begins...");

            var pumpControllers = new List<IFdcPumpController>();
            var communicableControllers = new List<IFdcCommunicableController>();
            var hengshanTerminals = new List<IDeviceHandler<byte[], NonCardDispenserMessageTemplateBase>>();

            foreach (dynamic processor in processors)
            {
                if (processor is IAppProcessor)
                {
                    FdcServerHostApp fdcServer = processor as FdcServerHostApp;
                    if (fdcServer != null)
                    {
                        logger.Info("FdcServerHostApp retrieved as an IApplication instance!");
                        fdcServerApp = processor;
                    }

                    PrinterHandler printer = processor as PrinterHandler;
                    if (printer != null)
                    {
                        InfoLog("Printer handler is available");
                        printerHandler = printer;
                    }

                    continue;
                }

                var handler = processor.Context.Handler;

                if (handler is IFdcPumpController)
                    pumpControllers.Add(handler);
                else if (handler is IEnumerable<IFdcPumpController>)
                    pumpControllers.AddRange(handler);
                else if (handler is IDeviceHandler<byte[], NonCardDispenserMessageTemplateBase>)
                    hengshanTerminals.Add(handler);
            }

            fdcPumpControllers = pumpControllers; //all pumps
            hengshanTerminalHandlers = hengshanTerminals; //all Hengshan IC Terminals

            InfoLog("HengshanPosApp init ends...");
        }

        #endregion

        #region IProcessor implementation

        public Task<bool> Start()
        {
            InfoLog("HengshanPosApp Start begins...");

            SetupSiteNozzles(fdcPumpControllers);
            SetupFuelingManagers(fdcPumpControllers);
            SetupTransactionSubmitters(fdcPumpControllers);
            SetupMRE();

            foreach (var termHanlder in hengshanTerminalHandlers)
            {
                var icTermHandler = termHanlder as HengshanICTermHandler;
                if (icTermHandler != null)
                {
                    icTermHandler.OnTerminalMessageReceived += IcTermHandler_OnTerminalMessageReceived;
                }
            }

            foreach (var fdcPumpController in fdcPumpControllers)
            {
                fdcPumpController.OnStateChange += FdcPumpController_OnStateChange;
            }

            if (fdcServerApp != null)
            {
                FdcServerHostApp fdcServer = fdcServerApp as FdcServerHostApp;
                fdcServer.OnCurrentFuellingStatusChange += FdcServer_OnCurrentFuellingStatusChange;
            }

            if (trxScanner != null)
            {
                trxScanner.OnMatchingTrxFound += TrxScanner_OnMatchingTrxFound;
                trxScanner.OnNoMatchFound += TrxScanner_OnNoMatchFound;
            }

            foreach (var transactionSubmitter in trxSubmitters)
            {
                transactionSubmitter.OnReceiptReceived += TransactionSubmitter_OnReceiptReceived;
            }

            InfoLog("HengshanPosApp Start ends...");

            return Task.FromResult(true);
        }

        private void TransactionSubmitter_OnReceiptReceived(object sender, ReceiptReceivedEventArgs e)
        {
            InfoLog("TrxSubmitter begins sending receipt data to printer...");

            if (printerHandler != null)
                printerHandler.SendFormattedReceipt(e.NozzleNo, e.ReceiptData);
        }

        public Task<bool> Stop()
        {
            foreach (var termHanlder in hengshanTerminalHandlers)
            {
                var icTermHandler = termHanlder as HengshanICTermHandler;
                if (icTermHandler != null)
                {
                    icTermHandler.OnTerminalMessageReceived -= IcTermHandler_OnTerminalMessageReceived;
                }
            }

            foreach (var fdcPumpController in fdcPumpControllers)
            {
                fdcPumpController.OnStateChange -= FdcPumpController_OnStateChange;
            }

            fdcServerApp.OnCurrentFuellingStatusChange -= FdcServer_OnCurrentFuellingStatusChange;

            if (trxScanner != null)
            {
                trxScanner.OnMatchingTrxFound -= TrxScanner_OnMatchingTrxFound;
                trxScanner.OnNoMatchFound -= TrxScanner_OnNoMatchFound;
            }

            if (mreDict!= null && mreDict.Count > 0)
            {
                foreach (var mre in mreDict)
                {
                    mre.Value?.Dispose();
                }
            }

            return Task.FromResult(true);
        }

        #endregion

        #region Event handlers

        private void FdcServer_OnCurrentFuellingStatusChange(object sender, FdcServerTransactionDoneEventArg e)
        {
            var fuelingManager = GetFuelingManager(e.Transaction.Nozzle.PumpId);

            if (fuelingManager != null)
            {
                //Update the fueling
                fuelingManager.UpdateFueling(e.Transaction);

                fuelingManager.UpdateFuelingState(FuelingState.Running);

                if (e.Transaction.Finished)
                {
                    HandleFinishedFueling(fuelingManager, e);
                }
            }
            else
            {
                InfoLog(e.Transaction.Nozzle.PumpId, "could not get the fueling manager on fuelling state change");
            }
        }

        private void FdcPumpController_OnStateChange(object sender, FdcPumpControllerOnStateChangeEventArg e)
        {
            IFdcPumpController currentPump = sender as IFdcPumpController;

            if (currentPump != null)
            {
                var pumpState = e.NewPumpState;
                var fuelingManager = GetFuelingManager(currentPump.PumpId);

                if (fuelingManager != null)
                {
                    if (pumpState == LogicalDeviceState.FDC_CALLING)
                    {
                        var callingNozzle = e.StateChangedNozzles.First().LogicalId;
                        InfoLog(currentPump.PumpId, $"calling nozzle id: {callingNozzle}");

                        if (fuelingManager.ActiveFueling != null && fuelingManager.ActiveFueling.ActiveNozzle != callingNozzle)
                        {
                            //calling nozzle changed, unauthorize the pump.
                            var result = fuelingManager.UnauthorizePump();
                            fuelingManager.ActiveFueling = null;
                        }
                        else
                        {
                            //Prepare the Active fueling.
                            fuelingManager.CreateFueling(callingNozzle);
                        }
                    }
                }
                else
                {
                    InfoLog($"Fueling manager is null on PumpState change for pump id: {currentPump.PumpId}");
                }
            }
            else
            {
                InfoLog($"Sender is not an IFdcPumpController, PumpStateChange, New State: {e.NewPumpState}");
                return;
            }
        }

        private void LockFuelSale(int clientId, int pumpId, int fdcSeqNo, int releaseToken)
        {
            mreDict[pumpId].Reset();
            InfoLog("Synchronizing locking");
            fdcServerApp.LockFuelSaleTrxAndNotifyAllFdcClientsAsync(clientId, pumpId, fdcSeqNo, releaseToken).GetAwaiter().GetResult();
            mreDict[pumpId].Set();
            InfoLog("Locking done, continue");
        }

        private void HandleFinishedFueling(FuelingManager fuelingManager, FdcServerTransactionDoneEventArg e)
        {
            //Lock the card transaction first
            if (fuelingManager.ActiveFueling != null && fuelingManager.ActiveFueling.AuthorizedByCard)
            {
                InfoLog($"Locking fuel sale transaction, "
                    + $"Pump id: {e.Transaction.Nozzle.PumpId}"
                    + $" FdcTrx SqNo: {e.Transaction.SequenceNumberGeneratedOnPhysicalPump},"
                    + $" Trx amount: {e.Transaction.Amount}");

                ThreadPool.QueueUserWorkItem(
                    new WaitCallback(delegate (object state)
                    {
                        LockFuelSale(100,
                            e.Transaction.Nozzle.PumpId,
                            e.Transaction.SequenceNumberGeneratedOnPhysicalPump,
                            e.ReleaseToken.Value);
                    }), null);
            }

            fuelingManager.UpdateFuelingState(FuelingState.Completed);

            InfoLog($"Fueling done on"
                + $" pump id: {e.Transaction.Nozzle.PumpId},"
                + $" nozzle id: {e.Transaction.Nozzle.LogicalId},"
                + $" PumpSqNo: {e.Transaction.SequenceNumberGeneratedOnPhysicalPump}");

            fPosDbManager.AddMapping(fuelingManager.ActiveFueling.FuelingSqNo,
                e.Transaction.SequenceNumberGeneratedOnPhysicalPump,
                e.Transaction.Nozzle.PumpId, e.Transaction.Nozzle.LogicalId,
                e.ReleaseToken.Value, (decimal)e.Transaction.Amount / 100);

            InfoLog(e.Transaction.Nozzle.PumpId, "start to search the matching IC card trx...");

            trxScanner.StartScanAsync(e.Transaction.Nozzle.PumpId,
                fuelingManager.ActiveFueling.FuelingSqNo,
                e.Transaction.SequenceNumberGeneratedOnPhysicalPump,
                e.ReleaseToken.Value,
                e.Transaction);

            //Active fueling is completed, then store it.
            fuelingManager.SetFuelingCompleted(e.Transaction);
            fuelingManager.StoreLastFueling(e.Transaction);
        }


        private void TrxScanner_OnMatchingTrxFound(object sender, MatchingTrxFoundEventArgs e)
        {
            //No need to lock non-customer card transactions.
            if (e.TrdInfo.CardType != (byte)ICCardType.Customer)
            {
                ThreadPool.QueueUserWorkItem(new WaitCallback(delegate (object state)
                {
                    UnlockFuelSaleTransaction(100, e.FdcTrx.Nozzle.PumpId, (ushort)e.TrdInfo.SeqNo, e.FdcSqNo, e.ReleaseToken);
                }), null);

                //var fuelSaleTrx = fdcServerApp.UnlockFuelSaleTrxAndNotifyAllFdcClients(
                //    100, e.FdcTrx.Nozzle.PumpId, e.FdcSqNo, e.ReleaseToken);

                //InfoLog($"Not a customer transaction, SqNo: {e.TrdInfo.SeqNo}, "
                //    + $"unlock it for further processing by POS, Success? {fuelSaleTrx != null}");

                return;
            }

            var submitter = GetTrxSubmitter(e.FdcTrx.Nozzle.PumpId);
            bool submitSuccess = submitter.SubmitTrx(e.TrdInfo, e.FdcSqNo, e.FdcTrx);

            DebugLog(e.FdcTrx.Nozzle.PumpId, $"  Submitting FPOS transaction of SeqNo: {e.FdcSqNo} success: {submitSuccess}");

            //Clear the fuel sale transaction regardless of submission status
            ClearFuelSaleTransaction(e);
        }

        private void UnlockFuelSaleTransaction(int clientId, int pumpId, ushort fPosSqNo, int fdcTrxNo, int releaseToken)
        {
            InfoLog("Wait until locking is done");
            mreDict[pumpId].WaitOne();

            var fuelSaleTrx = fdcServerApp.UnlockFuelSaleTrxAndNotifyAllFdcClientsAsync(clientId, pumpId, fdcTrxNo, releaseToken).Result;

            InfoLog($"Not a customer transaction, SqNo: {fPosSqNo}, "
                + $"unlock it for further processing by POS, Success? {fuelSaleTrx != null}");
        }

        private async void TrxScanner_OnNoMatchFound(object sender, NoMatchFoundEventArgs e)
        {
            alarmLogger.Info($"\n No matching IC card record found\n      Fdc SqNo: {e.FdcSqNo}," 
                + $" on pump: {e.FdcTrx.Nozzle.PumpId}, nozzle: {e.FdcTrx.Nozzle.LogicalId}, amount: {e.FdcTrx.Amount} unlocking fuel sale transaction");

            await fdcServerApp.UnlockFuelSaleTrxAndNotifyAllFdcClientsAsync(100, e.FdcTrx.Nozzle.PumpId, e.FdcSqNo, e.ReleaseToken);
        }

        private void ClearFuelSaleTransaction(MatchingTrxFoundEventArgs e)
        {
            FdcServerHostApp fdcServer = fdcServerApp as FdcServerHostApp;
            if (fdcServer != null)
            {
                var fuelSaleTrx = fdcServer.ClearFuelSaleTrxAndNotifyAllFdcClientsAsync(
                    e.TrdInfo.PumpNo, Convert.ToString(e.FdcSqNo), e.ReleaseToken, "100").Result;

                InfoLog($"Fuel sale transaction state: {fuelSaleTrx.State.ToString()}");
            }
        }

        private void IcTermHandler_OnTerminalMessageReceived(object sender, HengshanTerminalMessageEventArgs e)
        {
            #region GetNozzleStatus

            if (e.Message is GetNozzleStatusRequest)
            {
                HandleGetNozzleStatusRequest(e);
                return;
            }

            #endregion

            //fuelingManager and terminal for all request/response handling
            var fuelingManager = GetFuelingManager(e.PumpId);
            var terminal = GetTerminalById(e.PumpId);

            #region Reserve pump

            if (e.Message is ReservePumpWithAmountRequest)
            {
                InfoLog(e.PumpId, "ReservePumpWithAmountRequest" + $" amount: {(e.Message as ReservePumpWithAmountRequest).Amount}");

                if (fuelingManager != null)
                {
                    var reservePumpWithAmountResponse = fuelingManager.ReservePumpWithAmount((e.Message as ReservePumpWithAmountRequest).Amount);
                    terminal?.Write(reservePumpWithAmountResponse);
                }
                else
                {
                    ErrorLog(e.PumpId, "ReservePumpWithAmountRequest, no pump found, respond with failure!");

                    ReservePumpWithAmountResponse failedResponse = new ReservePumpWithAmountResponse
                    {
                        EnumResult = NonCardDispenserMessageTemplateBase.Result.失败
                    };

                    terminal?.Write(failedResponse);
                    return;
                }
            }

            #endregion

            else if (e.Message is ReservePumpWithGallonRequest)
            {
                if (fuelingManager != null)
                {
                    var reservePumpWithGallonResponse = fuelingManager.ReservePumpWithGallon((e.Message as ReservePumpWithGallonRequest).Gallon);
                    terminal?.Write(reservePumpWithGallonResponse);
                }
                else
                {
                    logger.Info($"ReservePumpWithGallonRequest: No pump found for this id - {e.PumpId}, respond with failure!");

                    ReservePumpWithGallonResponse failedResponse = new ReservePumpWithGallonResponse
                    {
                        EnumResult = NonCardDispenserMessageTemplateBase.Result.失败
                    };

                    terminal?.Write(failedResponse);
                    return;
                }
            }

            else if (e.Message is RoundUpByVolumeRequest)
            {
                if (fuelingManager != null)
                {
                    var roundUpByVolumeResponse = fuelingManager.HandleVolumeRounding();
                    terminal?.Write(roundUpByVolumeResponse);
                }
                else
                {
                    logger.Error($"RoundUpByVolumeRequest: No pump found for pump {e.PumpId}, respond with failure!");

                    RoundUpByVolumeResponse failureResponse = new RoundUpByVolumeResponse
                    {
                        EnumResult = NonCardDispenserMessageTemplateBase.Result.失败
                    };

                    terminal?.Write(failureResponse);
                    return;
                }
            }

            #region Pump authorization

            //
            // Authorize pump with preset amount
            //
            else if (e.Message is AuthPumpWithAmountRequest)
            {
                #region Old way auth pump with amount request

                var fdcPump = GetPumpById(e.PumpId);
                if (fdcPump == null)
                {
                    logger.Info($"AuthPumpWithAmountRequest: No pump found for this id - {e.PumpId}, respond with failure!");
                    SendPumpAuthResponse(e.PumpId, false, PumpAuthType.Amount);
                    return;
                }

                bool success = fdcPump.AuthorizeWithAmountAsync((e.Message as AuthPumpWithAmountRequest).Amount, (byte)e.PumpId).Result;
                SendPumpAuthResponse(e.PumpId, success, PumpAuthType.Amount);

                #endregion
            }
            //
            // Authorize pump with preset volume
            //
            else if (e.Message is AuthPumpWithGallonRequest)
            {
                #region old way auth pump with gallon request

                var fdcPump = GetPumpById(e.PumpId);
                if (fdcPump == null)
                {
                    logger.Info($"AuthPumpWithGallonRequest: No pump found for this id - {e.PumpId}, respond with failure!");
                    SendPumpAuthResponse(e.PumpId, false, PumpAuthType.Volume);
                    return;
                }

                bool success = fdcPump.AuthorizeWithAmountAsync((e.Message as AuthPumpWithGallonRequest).Gallon, (byte)e.PumpId).Result;
                SendPumpAuthResponse(e.PumpId, success, PumpAuthType.Volume);

                #endregion
            }
            else if (e.Message is AuthPumpWithKiloRequest)
            {
                //To be implemented when it's required.
            }
            //
            // Hengshan terminal command, Command 'Open' equals 'authorize pump'
            //
            else if (e.Message is OpenRequest)
            {
                InfoLog($"OpenRequest for pump {e.PumpId}");

                OpenResponse openResponse = new OpenResponse
                {
                    EnumResult = NonCardDispenserMessageTemplateBase.Result.成功
                };
                terminal?.Write(openResponse);

                if (fuelingManager != null)
                {
                    fuelingManager.ActiveFueling.FuelingState = FuelingState.Authorized;
                    fuelingManager.ActiveFueling.AuthorizedByCard = true;
                    bool authResult = fuelingManager.AuthorizePump();
                    logger.Info($"Authorizing pump {e.PumpId}, success? {authResult}");
                }
                else
                {
                    logger.Info($"No fueling manager for this OpenRequest with pump id:{e.PumpId}");
                }
            }

            #endregion

            #region Pump un-authorization

            else if (e.Message is UnAuthorizePumpRequest)
            {
                #region old way un-authorize pump request

                var fdcPump = GetPumpById(e.PumpId);
                if (fdcPump == null)
                {
                    logger.Info($"UnAuthorizePumpRequest: No pump found for this id - {e.PumpId}, respond with failure!");
                    SendPumpUnauthResponse(e.PumpId, false, PumpUnauthType.Unauthorize);
                    return;
                }

                #endregion
            }
            else if (e.Message is CloseRequest)
            {
                logger.Debug($"CloseRequest for Pump {e.PumpId}");

                if (fuelingManager != null)
                {
                    bool unauthResult = fuelingManager.UnauthorizePump();
                    logger.Debug($"Close resposne, success? {unauthResult}");
                    SendPumpUnauthResponse(e.PumpId, unauthResult, PumpUnauthType.General);
                }
                else
                {
                    logger.Info($"CloseRequest: No pump found for this id - {e.PumpId}, respond with failure!");
                    SendPumpUnauthResponse(e.PumpId, false, PumpUnauthType.General);
                    return;
                }
            }
            #endregion

            #region Pump Accumulator

            else if (e.Message is GetAccumulateRequest)
            {
                var terminalHandler = GetTerminalById(e.PumpId);

                if (fuelingManager != null)
                {
                    InfoLog(e.PumpId, $"GetAccumulateRequest");

                    var response = fuelingManager.GetAccumulator(1);
                    terminalHandler?.Write(response);
                }
                else
                {
                    GetAccumulateResponse getAccumulateResponse = new GetAccumulateResponse
                    {
                        升累计 = 0,
                        金额累计 = 0
                    };
                    terminalHandler?.Write(getAccumulateResponse);
                }
            }
            #endregion

            #region Rounding request

            else if (e.Message is RoundingRequest)
            {
                DebugLog(e.PumpId, "RoundingRequest");

                if (fuelingManager != null)
                {
                    SendRoundingResponse(e.PumpId, fuelingManager.GetRoundingResult());
                }
                else
                {
                    var roundingResponse = new RoundingResponse
                    {
                        EnumResult = NonCardDispenserMessageTemplateBase.Result.失败
                    };

                    SendRoundingResponse(e.PumpId, roundingResponse);
                }
            }
            #endregion

            #region Cancel full monitor

            else if (e.Message is CancelFullMonitorRequest)
            {
                InfoLog(e.PumpId, "CancelFuellMonitorRequest");

                var response = new CancelFullMonitorResponse
                {
                    EnumResult = NonCardDispenserMessageTemplateBase.Result.成功
                };

                terminal?.Write(response);

                InfoLog(e.PumpId, "CancelFullMonitorResponse");
            }

            #endregion
        }

        #endregion

        #region Send rounding response

        /// <summary>
        /// Sends the rounding (凑整) response to IC card reader.
        /// </summary>
        /// <param name="pumpId">Current pump id.</param>
        /// <param name="response">The rounding response.</param>
        private void SendRoundingResponse(int pumpId, RoundingResponse response)
        {
            var terminal = GetTerminalById(pumpId);
            terminal?.Write(response);
        }

        #endregion

        #region Authorization

        /// <summary>
        /// Sends pump authorization response to Hengshan EPS.
        /// </summary>
        /// <param name="pumpId">Current pump id.</param>
        /// <param name="success">Authorization result, success or failure.</param>
        /// <param name="authType">Pump authorization type.</param>
        private void SendPumpAuthResponse(int pumpId, bool success, PumpAuthType authType)
        {
            var terminal = GetTerminalById(pumpId);

            NonCardDispenserMessageTemplateBase authResponse = null;

            if (authType == PumpAuthType.Amount) //Authorize pump with preset amount
            {
                authResponse = new AuthPumpWithAmountResponse
                {
                    EnumResult = success ?
                        NonCardDispenserMessageTemplateBase.Result.成功 : NonCardDispenserMessageTemplateBase.Result.失败
                };
            }
            else if (authType == PumpAuthType.Volume) //Authorize pump with preset volume
            {
                authResponse = new AuthPumpWithGallonResponse
                {
                    EnumResult = success ?
                        NonCardDispenserMessageTemplateBase.Result.成功 : NonCardDispenserMessageTemplateBase.Result.失败
                };
            }
            else if (authType == PumpAuthType.General) //Open request
            {
                authResponse = new OpenResponse
                {
                    EnumResult = success ?
                        NonCardDispenserMessageTemplateBase.Result.成功 : NonCardDispenserMessageTemplateBase.Result.失败
                };
            }

            terminal?.Write(authResponse);
        }

        /// <summary>
        /// Send pump un-authoirzation response to Hengshan EPS.
        /// </summary>
        /// <param name="pumpId">Current pump id.</param>
        /// <param name="success">Un-authorization result, success or failure.</param>
        /// <param name="unauthType">Un-authorization type.</param>
        private void SendPumpUnauthResponse(int pumpId, bool success, PumpUnauthType unauthType)
        {
            var terminal = GetTerminalById(pumpId);

            NonCardDispenserMessageTemplateBase unauthResponse = null;

            if (unauthType == PumpUnauthType.Unauthorize) //Unauthorize pump, regardless of amount or volume preset
            {
                unauthResponse = new UnAuthorizePumpResponse
                {
                    EnumResult = success ?
                        NonCardDispenserMessageTemplateBase.Result.成功 : NonCardDispenserMessageTemplateBase.Result.失败
                };
            }
            else if (unauthType == PumpUnauthType.General) //Close request
            {
                unauthResponse = new CloseResponse
                {
                    EnumResult = success ?
                        NonCardDispenserMessageTemplateBase.Result.成功 : NonCardDispenserMessageTemplateBase.Result.失败
                };
            }

            terminal?.Write(unauthResponse);
        }

        #endregion

        #region Handle NozzleStatusRequest

        /// <summary>
        /// Handles the GetNozzleStatusRequest sent from Hengshan IC Terminal.
        /// </summary>
        /// <param name="e">The request message event.</param>
        private void HandleGetNozzleStatusRequest(HengshanTerminalMessageEventArgs e)
        {
            if (logger.IsDebugEnabled)
                logger.Debug("\n");

            DebugLog(e.PumpId, $"GetNozzleStatusRequest for pump id: {e.PumpId}");

            DebugLog(e.PumpId, "GNS Req");

            var fuelingManager = GetFuelingManager(e.PumpId);

            if (fuelingManager != null)
            {
                DebugLog(e.PumpId, $"Start to handle nozzle status request");
                var currentNozzleStatus = fuelingManager.GetNozzleStatus();
                SendNozzleStatusResponse(e.PumpId, currentNozzleStatus);

                var currentFdcPump = fdcPumpControllers.FirstOrDefault(p => p.PumpId == e.PumpId);
                if (currentFdcPump != null && currentFdcPump.QueryStatusAsync().Result == LogicalDeviceState.FDC_CALLING)
                {
                    InfoLog(e.PumpId, $"{currentNozzleStatus.ToLogString()}");
                }

                DebugLog(e.PumpId, $"{currentNozzleStatus.ToLogString()}");
            }
            else
            {
                InfoLog($"Could not get the FuelingManager for pump id = {e.PumpId}");
                SendNozzleStatusResponse(e.PumpId, GetNozzleStatusResponse.PumpStatus.不允许加油);
                return;
            }
        }

        #endregion

        #region Send NozzleStatusResponse

        private void SendNozzleStatusResponse(int pumpId, GetNozzleStatusResponse response)
        {
            var terminal = GetTerminalById(pumpId);
            if (terminal == null)
            {
                throw new NullReferenceException("Hengshan Terminal could not be found!");
            }

            terminal.Write(response);
        }

        private void SendNozzleStatusResponse(int pumpId, GetNozzleStatusResponse.PumpStatus pumpStatus)
        {
            var getNozzleStatusResponse = new GetNozzleStatusResponse();
            getNozzleStatusResponse.AddPumpStatus(pumpStatus);
            SendNozzleStatusResponse(pumpId, getNozzleStatusResponse);
        }

        #endregion

        #region Get Pump

        /// <summary>
        /// Gets the FDC pump controller.
        /// </summary>
        /// <param name="pumpId">The pump id.</param>
        /// <returns></returns>
        private IFdcPumpController GetPumpById(int pumpId)
        {
            return fdcPumpControllers?.FirstOrDefault(f => f.PumpId == pumpId);
        }

        #endregion

        #region Get Terminal

        /// <summary>
        /// Gets the Hengshan IC terminal handler
        /// </summary>
        /// <param name="pumpId">The pump id.</param>
        /// <returns></returns>
        private HengshanICTermHandler GetTerminalById(int pumpId)
        {
            foreach (var termHandler in hengshanTerminalHandlers)
            {
                var terminal = termHandler as HengshanICTermHandler;
                if (terminal != null && terminal.AssociatedPumpId.Equals(pumpId))
                    return terminal;
            }

            return null;
        }

        #endregion

        #region Site nozzles setup

        /// <summary>
        /// Set up the site nozzles, in particular the nozzle number
        /// Strategy:
        ///     1. Sort the Pumps by id
        ///     2. Sort the nozzles by logical id
        ///     3. The site nozzle number then will be (Pump id, Logical nozzle id) => site nozzle number
        ///        e.g. (1, 1) => 1, (1, 2) => 2, (2, 1) => 3, (3, 1) => 4, (3, 2) => 5, (4, 1) => 6 ...
        /// </summary>
        /// <param name="fdcPumpControllers">The Fdc pump instance collection.</param>
        private void SetupSiteNozzles(IEnumerable<IFdcPumpController> fdcPumpControllers)
        {
            nozzles.Clear();

            int nozzleNo = 1; //Site nozzle number starts with 1
            var pumps = fdcPumpControllers.OrderBy(c => c.PumpId);

            foreach (var pump in pumps)
            {
                var pumpNozzles = pump.Nozzles.OrderBy(n => n.LogicalId);
                foreach (var nozzle in pumpNozzles)
                {
                    InfoLog($"({pump.PumpId}, {nozzle.LogicalId}) => {nozzleNo}");

                    nozzles.Add((pump.PumpId, nozzle.LogicalId), nozzleNo);
                    nozzleNo++;
                }
            }
        }

        #endregion

        #region Fueling manager setup

        private void SetupFuelingManagers(IEnumerable<IFdcPumpController> fdcPumpControllers)
        {
            fuelingManagers.Clear();

            foreach (var fdcPump in fdcPumpControllers)
            {
                fuelingManagers.Add(fdcPump.PumpId,
                    new FuelingManager(fdcPump.PumpId, fdcPump, fdcServerApp, fdcDbContext, fPosDbManager, CampaignEngine));

                InfoLog($"Fueling manager for pump id: {fdcPump.PumpId} added.");
            }
        }

        private FuelingManager GetFuelingManager(int pumpId)
        {
            DebugLog(pumpId, "get fueling manager");

            FuelingManager fuelingManager = null;
            fuelingManagers.TryGetValue(pumpId, out fuelingManager);
            return fuelingManager;
        }

        #endregion

        #region Set up transaction sumbitters

        private void SetupTransactionSubmitters(IEnumerable<IFdcPumpController> fdcPumpControllers)
        {
            trxSubmitters.Clear();

            foreach (var fdcPump in fdcPumpControllers)
            {
                trxSubmitters.Add(
                    new TrxSubmitter(fdcPump.PumpId, fPosDbManager, cloudCredential) { SiteNozzles = nozzles });

                InfoLog($"Transaction submitter for pump id: {fdcPump.PumpId} added.");
            }
        }

        private TrxSubmitter GetTrxSubmitter(int pumpId)
        {
            return trxSubmitters.FirstOrDefault(t => t.Id == pumpId);
        }

        #endregion

        #region Setup MRE

        private void SetupMRE()
        {
            foreach (var fdcPump in fdcPumpControllers)
            {
                mreDict.Add(fdcPump.PumpId, new ManualResetEvent(false));
            }
        }

        #endregion

        #region Log methods

        private void InfoLog(string log)
        {
            if (logger.IsInfoEnabled)
                logger.Info(log);
        }

        private void InfoLog(int pumpId, string log)
        {
            if (logger.IsInfoEnabled)
                logger.Info($"Pump {pumpId}, {log}");
        }

        private void DebugLog(int pumpId, string log)
        {
            if (logger.IsDebugEnabled)
                logger.Debug($"Pump {pumpId}, {log}");
        }

        private void ErrorLog(int pumpId, string log)
        {
            if (logger.IsErrorEnabled)
                logger.Error($"Pump {pumpId}, {log}");
        }

        #endregion
    }
}