using Edge.Core.Database.Models;
using Edge.Core.Processor;using Edge.Core.IndustryStandardInterface.Pump;
using LanTian_Pump_664_Or_886.MessageEntity;
using LanTian_Pump_664_Or_886.MessageEntity.Incoming;
using LanTian_Pump_664_Or_886.MessageEntity.Outgoing;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Edge.Core.Parser.BinaryParser.Util;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using Wayne.FDCPOSLibrary;
using Edge.Core.IndustryStandardInterface.Pump;

namespace LanTian_Pump_664_Or_886
{
    public class PumpHandler : IFdcPumpController, IDeviceHandler<byte[], MessageBase>
    {
        public enum PumpModel
        {
            // for all cases, like totalizer, amount, price data fields and etc., has smaller value range
            Model_664 = 0,
            // for all cases, like totalizer, amount, price data fields and etc., has wider value range
            Model_886 = 1
        }

        public enum PumpAuthorizeMode
        {
            FC_Authorize = 0,
            Pump_Self_Authorize = 1,
        }

        static ILogger logger = NullLogger.Instance;

        private LogicalDeviceState lastLogicalDeviceState = LogicalDeviceState.FDC_OFFLINE;
        private DateTime lastLogicalDeviceStateReceivedTime;
        // by seconds, change this value need change the correlated deviceOfflineCountdownTimer's interval as well
        public const int lastLogicalDeviceStateExpiredTime = 9;
        private List<LogicalNozzle> nozzles = new List<LogicalNozzle>();

        private System.Timers.Timer deviceOfflineCountdownTimer;

        private IContext<byte[], MessageBase> context;
        private bool isOnFdcServerInitCalled = false;

        private int pumpId;
        private PumpModel pumpModel;
        private PumpAuthorizeMode pumpAuthorizeMode;


        private int amountDecimalDigits;
        private int volumeDecimalDigits;
        private int priceDecimalDigits;
        private int volumeTotalizerDecimalDigits;

        /// <summary>
        /// for avoid a case that FC may miss a pump status change event(pump side issue? or wire issue?),
        /// we timely actively request the pump state.
        /// </summary>
        //private System.Timers.Timer pollingPumpStatus;
        //private int pollingPumpStatusInterval = 30000;

        #region

        public string Name => "LanTian_Pump_664_Or_886";

        public int PumpId => this.pumpId;

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

        public int AmountDecimalDigits => this.amountDecimalDigits;

        public int VolumeDecimalDigits => this.volumeDecimalDigits;

        public int PriceDecimalDigits => this.priceDecimalDigits;

        public int VolumeTotalizerDecimalDigits => this.volumeDecimalDigits;

        public Guid Id => Guid.NewGuid();

        public int PumpPhysicalId => throw new NotImplementedException();

        public event EventHandler<FdcPumpControllerOnStateChangeEventArg> OnStateChange;
        public event EventHandler<FdcTransactionDoneEventArg> OnCurrentFuellingStatusChange;



        public async Task<global::Wayne.FDCPOSLibrary.LogicalDeviceState> QueryStatusAsync()
        {
            return this.lastLogicalDeviceState;
        }

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

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

        #endregion

        public PumpHandler(int pumpId) : this(pumpId, PumpModel.Model_664, PumpAuthorizeMode.FC_Authorize, 2, 2, 2, 2)
        {
        }

        public PumpHandler(int pumpId, PumpModel pumpModel, PumpAuthorizeMode pumpAuthorizeMode,
        int amountDecimalDigits, int volumeDecimalDigits,
        int priceDecimalDigits, int volumeTotalizerDecimalDigits)
        {
            this.pumpId = pumpId;
            this.pumpModel = pumpModel;
            this.pumpAuthorizeMode = pumpAuthorizeMode;
            this.amountDecimalDigits = amountDecimalDigits;
            this.volumeDecimalDigits = volumeDecimalDigits;
            this.priceDecimalDigits = priceDecimalDigits;
            this.volumeTotalizerDecimalDigits = volumeTotalizerDecimalDigits;

            this.pumpId = pumpId;
            // real nozzle Id put hardcode 1 here since HengShan_pump_nonIC only have 1 nozzle per pump.
            // price is not dectected yet, put Null.
            this.nozzles.Add(new LogicalNozzle(pumpId, 1, 1, null));

            this.deviceOfflineCountdownTimer = new System.Timers.Timer(3000);
            this.deviceOfflineCountdownTimer.Elapsed += (_, __) =>
            {
                if (DateTime.Now.Subtract(this.lastLogicalDeviceStateReceivedTime).TotalSeconds
                    >= lastLogicalDeviceStateExpiredTime)
                {
                    if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_OFFLINE)
                    {
                        this.lastLogicalDeviceState = LogicalDeviceState.FDC_OFFLINE;
                        logger.LogInformation("Pump: " + this.pumpId + ", " + "      State switched to FDC_OFFLINE due to long time no see pump data incoming");
                        var safe0 = this.OnStateChange;
                        safe0?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(LogicalDeviceState.FDC_OFFLINE, null));
                        logger.LogTrace("Pump: " + this.pumpId + ", " + "      OnStateChange event fired and back");
                    }
                }
            };
            this.deviceOfflineCountdownTimer.Start();
        }

        public void OnFdcServerInit(Dictionary<string, object> parameters)
        {
            if (parameters.ContainsKey("LastPriceChange"))
            {
                // nozzle logical id:rawPrice
                var lastPriceChanges = parameters["LastPriceChange"] as Dictionary<byte, int>;
                foreach (var priceChange in lastPriceChanges)
                {
                    logger.LogInformation("Pump: " + this.pumpId + ", " + "Pump " + this.pumpId + " OnFdcServerInit, load last price change " +
                        "on logical nozzle: " + priceChange.Key + " with price: " + priceChange.Value);
                    this.nozzles.First(n => n.LogicalId == priceChange.Key).ExpectingPriceOnFcSide = priceChange.Value;
                }
            }

            /* Load Last sale trx(from db) for void the case of FC accidently disconnect from Pump in fueling,
             and may cause a fueling trx gone from FC control */
            if (parameters.ContainsKey("LastFuelSaleTrx"))
            {
                // nozzle logical id:LastSale
                var lastFuelSaleTrxes = parameters["LastFuelSaleTrx"] as Dictionary<byte, FuelSaleTransaction>;
                foreach (var lastFuelSaleTrx in lastFuelSaleTrxes)
                {
                    logger.LogInformation("Pump: " + this.pumpId + ", OnFdcServerInit, load last volume Totalizer " +
                        "on logical nozzle: " + lastFuelSaleTrx.Key + " with volume value: " + lastFuelSaleTrx.Value.VolumeTotalizer);
                    this.nozzles.First(n => n.LogicalId == lastFuelSaleTrx.Key).VolumeTotalizer = lastFuelSaleTrx.Value.VolumeTotalizer;
                }
            }

            this.isOnFdcServerInitCalled = true;
        }

        public void Init(IContext<byte[], MessageBase> context)
        {
            this.context = context;
            var timeWindowWithActivePollingOutgoing =
                this.context.Outgoing as TimeWindowWithActivePollingOutgoing<byte[], MessageBase>;
            timeWindowWithActivePollingOutgoing.PollingMsgProducer = () => new ReadPumpStateRequest();
        }

        public async Task Process(IContext<byte[], MessageBase> context)
        {
            if (!isOnFdcServerInitCalled) return;
            this.lastLogicalDeviceStateReceivedTime = DateTime.Now;

            if (this.lastLogicalDeviceState == LogicalDeviceState.FDC_OFFLINE)
            {
                logger.LogInformation("Pump: " + this.pumpId + ", " + "Recevied an Pump Msg in FDC_OFFLINE state, " +
                    "indicates the underlying connection is established, switch to FDC_READY");
                this.lastLogicalDeviceState = LogicalDeviceState.FDC_READY;
                this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(LogicalDeviceState.FDC_READY));
                logger.LogTrace("Pump: " + this.pumpId + ", " + "      OnStateChange event fired and back");

                #region Start the Initial pump change price process

                var readPriceResponse = await this.context.Outgoing.WriteAsync(new ReadPriceRequest(),
                    (request, response) => response is ReadPriceResponse, 3000).ConfigureAwait(false) as ReadPriceResponse;
                if (readPriceResponse == null)
                {
                    logger.LogInformation("Pump: " + this.pumpId + ", " + " Reading initial pump side price timedout, will ignore this error and won't send a ChangePriceRequest here but may need a manual Price change if find price discrepancy");
                    return;
                }

                this.nozzles.First().RealPriceOnPhysicalPump = readPriceResponse.Price;

                if (this.nozzles.First().ExpectingPriceOnFcSide.HasValue
                    && readPriceResponse.Price != this.nozzles.First().ExpectingPriceOnFcSide.Value)
                {
                    logger.LogInformation("Pump: " + this.pumpId + ", " + " Read the initial pump side price(without decimal points): " + readPriceResponse.Price + " which NOT Equals with the price as FC expect, will start a change price internally...");
                    var changePriceResponse = await this.context.Outgoing.WriteAsync(
                        new ChangePriceRequest(this.nozzles.First().ExpectingPriceOnFcSide.Value, this.pumpModel == PumpModel.Model_664 ? (byte)2 : (byte)3),
                        (request, response) => response is ChangePriceResponse, 3000).ConfigureAwait(false) as ChangePriceResponse;
                    if (changePriceResponse == null || !changePriceResponse.Succeed)
                    {
                        logger.LogInformation("Pump: " + this.pumpId + ", " + " Initial change price timedout or failed, may need a manual price change later if find price discrepancy");
                        return;
                    }

                    var doubleConfirm_readPriceResponse = await this.context.Outgoing.WriteAsync(new ReadPriceRequest(),
                    (request, response) => response is ReadPriceResponse, 3000).ConfigureAwait(false) as ReadPriceResponse;
                    if (doubleConfirm_readPriceResponse == null)
                        logger.LogInformation("Pump: " + this.pumpId + ", " + " Double confirm Initial change price timedout, so FC can't sure if the new price applied, or a manual Price change is needed if find price discrepancy");
                    else if (doubleConfirm_readPriceResponse.Price == this.nozzles.First().ExpectingPriceOnFcSide.Value)
                        logger.LogInformation("Pump: " + this.pumpId + ", " + " Double confirm succeed for new FC price(without decimal points): " + this.nozzles.First().ExpectingPriceOnFcSide.Value + " have been applied to pump.");
                    else
                        logger.LogInformation("Pump: " + this.pumpId + ", " + " Double confirm failed for new FC price(without decimal points): " + this.nozzles.First().ExpectingPriceOnFcSide.Value + " failed applying to pump as pump side still report its price(without decimal point): " + doubleConfirm_readPriceResponse.Price + ", a manual Change Price is needed");
                }
                else
                    logger.LogInformation("Pump: " + this.pumpId + ", " + " Read the initial pump side price(without decimal points): " + readPriceResponse.Price + ", no need to align with FC(FC has no expecting price)");

                #endregion

            }

            if (context.Incoming.Message is ReadPumpStateResponse readPumpStateResponse)
            {

                #region AcquireControl if pump authorize mode is FC_Authorize

                if (readPumpStateResponse.ControlState == ReadPumpStateResponse.ControlStateEnum.自控
                            && this.pumpAuthorizeMode == PumpAuthorizeMode.FC_Authorize)
                {
                    var acquireControlResponse = await this.context.Outgoing.WriteAsync(
                        new AcquireControlRequest(),
                        (request, response) => response is AcquireControlResponse, 3000).ConfigureAwait(false) as AcquireControlResponse;
                    if (acquireControlResponse == null)
                    {
                        logger.LogInformation("Pump: " + this.pumpId + ", " + " AcquireControlResponse first time timedout, will send 2nd time...");
                        acquireControlResponse = await this.context.Outgoing.WriteAsync(
                        new AcquireControlRequest(),
                        (request, response) => response is AcquireControlResponse, 3000).ConfigureAwait(false) as AcquireControlResponse;
                        if (acquireControlResponse == null)
                            logger.LogInformation("Pump: " + this.pumpId + ", " + " AcquireControlResponse 2nd time timedout, will ignore this error, then the pump may have wrong authorize mode");
                    }
                }

                #endregion

                if (this.lastLogicalDeviceState != LogicalDeviceState.FDC_FUELLING
                    && readPumpStateResponse.NozzleState == ReadPumpStateResponse.NozzleStateEnum.提枪)
                {
                    logger.LogDebug("Pump: " + this.pumpId + ", " + " Nozzle state report as NozzleStateEnum.提枪, State switched to FDC_CALLING");
                    this.lastLogicalDeviceState = LogicalDeviceState.FDC_CALLING;
                    this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(LogicalDeviceState.FDC_CALLING, this.nozzles.First()));
                }

                if (this.lastLogicalDeviceState == LogicalDeviceState.FDC_AUTHORISED
                    && readPumpStateResponse.NozzleState == ReadPumpStateResponse.NozzleStateEnum.提枪)
                {
                    logger.LogDebug("Pump: " + this.pumpId + ", " + " internal Fdc State: " + this.lastLogicalDeviceState + ", Nozzle State switched to FDC_FUELLING");
                    this.lastLogicalDeviceState = LogicalDeviceState.FDC_FUELLING;
                    this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(LogicalDeviceState.FDC_FUELLING, this.nozzles.First()));

                    while (true)
                    {
                        var readFuelDataResponse = await this.context.Outgoing.WriteAsync(
                            new ReadFuelDataRequest(),
                            (request, response) => response is ReadFuelDataResponse, 3000).ConfigureAwait(false) as ReadFuelDataResponse;
                        if (readFuelDataResponse == null)
                        {

                        }
                        else
                        {
                            logger.LogDebug("Pump: " + this.pumpId + ", " + "   fueling in progress with amt: " + readFuelDataResponse.Amount
                            + ", vol: " + readFuelDataResponse.Volume);

                            // at least within 65 years, exception will not throw here
                            //int newTrxSeqNumber = (int)(DateTime.Now.Subtract(new DateTime(2018, 5, 25)).TotalSeconds);
                            //fire fuelling progress.
                            this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                            {
                                // 恒山油机只有一把枪
                                Nozzle = this.nozzles.First(),
                                Amount = readFuelDataResponse.Amount,
                                Volumn = readFuelDataResponse.Volume,
                                Price = this.nozzles.First().RealPriceOnPhysicalPump ?? -1,
                                Finished = false,
                            }));
                        }
                    }
                }

                if (this.lastLogicalDeviceState == LogicalDeviceState.FDC_FUELLING
                    && readPumpStateResponse.NozzleState == ReadPumpStateResponse.NozzleStateEnum.挂枪)
                {
                    logger.LogDebug("Pump: " + this.pumpId + ", " + "internal Fdc State: " + this.lastLogicalDeviceState + ", Nozzle state report as NozzleStateEnum.挂枪 ,State switched to FDC_READY");
                    this.lastLogicalDeviceState = LogicalDeviceState.FDC_READY;
                    this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(LogicalDeviceState.FDC_READY, this.nozzles.First()));
                }
            }
        }

        public Task<System.Tuple<int, int>> QueryTotalizerAsync(byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

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

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

        public Task<bool> ChangeFuelPriceAsync(int newPriceWithoutDecimalPoint, byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

        public Task<bool> AuthorizeAsync(byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

        public Task<bool> UnAuthorizeAsync(byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

        public Task<bool> AuthorizeWithAmountAsync(int moneyAmountWithoutDecimalPoint, byte logicalNozzleId)
        {
            throw new NotImplementedException();
        }

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

        public Task<bool> FuelingRoundUpByAmountAsync(int amount)
        {
            throw new NotImplementedException();
        }

        public Task<bool> FuelingRoundUpByVolumeAsync(int volume)
        {
            throw new NotImplementedException();
        }
    }
}