using AutoMapper;
using Edge.Core.Database;
using Edge.Core.Database.Models;
using Edge.Core.IndustryStandardInterface.Pump;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Wayne.FDCPOSLibrary;

namespace EagleStar_Pump
{
    public class PumpHandler : IFdcPumpController, IDisposable
    {
        private PumpGroupConfiguration appConfig;
        private ILogger logger;
        private IServiceProvider services;
        private System.Timers.Timer autoCallingTimer;
        private string owner = "EagleStarPumpApp";
        private string type = "YingGaoFlag";

        /// <summary>
        /// 
        /// </summary>
        public PumpHandler(PumpGroupConfiguration appConfig, ILogger logger, IServiceProvider services)
        {
            this.appConfig = appConfig;
            this.logger = logger;
            this.services = services;

            int fid = 0;
            var genericDatas = GetGenericData(type);
            if (genericDatas.Count() > 0)
            {
                fid = (int)genericDatas.First().IntProperty0;
            }
            else
            {
                _ = SaveDbAsync(type, new GenericData()
                {
                    Type = type,
                    IntProperty0 = fid
                });
            }

            this.autoCallingTimer = new System.Timers.Timer(3000);
            this.autoCallingTimer.Elapsed += (_, __) =>
            {
                this.autoCallingTimer?.Stop();
                var dataList = SqlClientHelper.ReadTransactionData(this.appConfig, this.logger, ref fid);
                foreach (var trx in dataList)
                {
                    this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(trx));
                }

                _ = UpdateDbAsync(type, new GenericData()
                {
                    Type = type,
                    IntProperty0 = fid
                });
                this.autoCallingTimer?.Start();
            };
            this.autoCallingTimer?.Start();
        }

        private IEnumerable<GenericData> GetGenericData(string type)
        {
            using (var scope = this.services.CreateScope())
            {
                var objMapper = this.services.GetRequiredService<IMapper>();
                var dbContext = scope.ServiceProvider.GetRequiredService<SqliteDbContext>();
                var genericDatas = dbContext.GenericDatas.Where(gd =>
                        gd.Type == type
                        && gd.Owner == owner);
                return objMapper.Map<IEnumerable<GenericData>>(genericDatas.ToList());
            }
        }

        private async Task SaveDbAsync(string type, GenericData data)
        {
            using (var scope = this.services.CreateScope())
            {
                try
                {
                    var dbContext = scope.ServiceProvider.GetRequiredService<SqliteDbContext>();
                    data.Owner = owner;
                    dbContext.GenericDatas.Add(data);
                    await dbContext.SaveChangesAsync();
                }
                catch (Exception ex)
                {
                    logger.LogError($"In SaveOrUpdateDbAsync: {ex}");
                }
            }
        }

        private async Task UpdateDbAsync(string type, GenericData data)
        {
            using (var scope = this.services.CreateScope())
            {
                try
                {
                    var dbContext = scope.ServiceProvider.GetRequiredService<SqliteDbContext>();
                    var genericDatas = dbContext.GenericDatas.Where(gd =>
                            gd.Type == type
                            && gd.Owner == owner);
                    if (genericDatas.Count() > 0)
                    {
                        var gdt = genericDatas.First();
                        gdt.IntProperty0 = data.IntProperty0;
                        dbContext.GenericDatas.Update(gdt);
                        await dbContext.SaveChangesAsync();
                    }
                }
                catch (Exception ex)
                {
                    logger.LogError($"In SaveOrUpdateDbAsync: {ex}");
                }
            }
        }

        private IEnumerable<LogicalNozzle> nozzles = new List<LogicalNozzle>();
        private bool enableFuelSimulation;
        private int pumpId;
        private int pumpPhysicalId;

        private LogicalDeviceState currentState = LogicalDeviceState.FDC_READY;
        public string Name => "Bogus_Pump handler";

        public int PumpId => this.pumpId;

        public int PumpPhysicalId => this.pumpPhysicalId;

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

        public int AmountDecimalDigits => 2;

        public int VolumeDecimalDigits => 2;

        public int PriceDecimalDigits => 2;

        public int VolumeTotalizerDecimalDigits => 2;

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

        public async Task<bool> AuthorizeAsync(byte logicalNozzleId)
        {
            //if (this.enableFuelSimulation)
            //    return false;
            if (this.currentState == LogicalDeviceState.FDC_AUTHORISED
                || this.currentState == LogicalDeviceState.FDC_FUELLING)
                return false;
            LogicalNozzle n = this.nozzles.FirstOrDefault(n => n.LogicalId == logicalNozzleId);
            if (n == null) return await Task.FromResult(false);
            await Task.Delay(1000);
            this.currentState = LogicalDeviceState.FDC_AUTHORISED;
            this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(this.currentState, n));
            await Task.Delay(1000);
            this.currentState = LogicalDeviceState.FDC_FUELLING;
            this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(this.currentState, n));
            await Task.Delay(300);
            _ = Task.Run(() =>
            {
                int amt = 0;
                int vol = 0;
                int seqNumber = (int)(DateTime.Now.Subtract(new DateTime(2021, 1, 1)).TotalSeconds);
                const int FireMaxTimes = 12;
                int firedTimes = 0;

                while (true)
                {
                    amt += new Random().Next(500, 1000);
                    vol += new Random().Next(100, 300);
                    this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                    {
                        Amount = amt,
                        Volumn = vol,
                        Nozzle = n,
                        Price = n.RealPriceOnPhysicalPump ?? -1,
                        SequenceNumberGeneratedOnPhysicalPump = seqNumber,
                        Finished = false
                    }));
                    Thread.Sleep(1000);
                    firedTimes++;
                    if (firedTimes > FireMaxTimes)
                    {
                        this.currentState = LogicalDeviceState.FDC_READY;
                        this.OnStateChange?.Invoke(this, new FdcPumpControllerOnStateChangeEventArg(this.currentState, n));
                        this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                        {
                            Amount = amt,
                            Volumn = vol,
                            Nozzle = n,
                            Price = n.RealPriceOnPhysicalPump ?? -1,
                            SequenceNumberGeneratedOnPhysicalPump = seqNumber,
                            AmountTotalizer = new Random().Next(9999, 99999999),
                            VolumeTotalizer = new Random().Next(1000, 11999999),
                            Finished = true
                        }));
                        break;
                    }
                }
            });
            return await Task.FromResult(true);
        }

        public Task<bool> AuthorizeWithAmountAsync(int moneyAmountWithoutDecimalPoint, byte logicalNozzleId)
        {
            return this.AuthorizeAsync(logicalNozzleId);
        }

        public Task<bool> AuthorizeWithVolumeAsync(int volumnWithoutDecimalPoint, byte logicalNozzleId)
        {
            return this.AuthorizeAsync(logicalNozzleId);
        }

        public Task<bool> ChangeFuelPriceAsync(int newPriceWithoutDecimalPoint, byte logicalNozzleId)
        {
            if (this.enableFuelSimulation)
                return Task.FromResult(false);
            var targetNozzle = this.nozzles.FirstOrDefault(n => n.LogicalId == logicalNozzleId);
            if (targetNozzle != null)
            {
                targetNozzle.RealPriceOnPhysicalPump = newPriceWithoutDecimalPoint;
                targetNozzle.ExpectingPriceOnFcSide = newPriceWithoutDecimalPoint;
                return Task.FromResult(true);
            }
            else
                return Task.FromResult(false);
        }

        public Task<bool> FuelingRoundUpByAmountAsync(int amount)
        {
            return Task.FromResult(true);
        }

        public Task<bool> FuelingRoundUpByVolumeAsync(int volume)
        {
            return Task.FromResult(true);
        }

        public Task<bool> LockNozzleAsync(byte logicalNozzleId)
        {
            return Task.FromResult(true);
        }

        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)
                {
                    var targetNozzle = this.nozzles.FirstOrDefault(n => n.LogicalId == priceChange.Key);
                    if (targetNozzle != null)
                    {
                        targetNozzle.RealPriceOnPhysicalPump = priceChange.Value;
                        targetNozzle.ExpectingPriceOnFcSide = priceChange.Value;
                    }
                }
            }
        }

        public Task<LogicalDeviceState> QueryStatusAsync()
        {
            return Task.FromResult(this.currentState);
        }

        public Task<Tuple<int, int>> QueryTotalizerAsync(byte logicalNozzleId)
        {
            if (this.enableFuelSimulation)
                Task.FromResult(new Tuple<int, int>(-1, -1));
            return Task.FromResult(
                new Tuple<int, int>(
                    new Random().Next(100000, 999999),
                    new Random().Next(50000, 99999)));
        }

        public Task<bool> ResumeFuellingAsync()
        {
            return Task.FromResult(true);
        }

        public Task<bool> SuspendFuellingAsync()
        {
            return Task.FromResult(true);
        }

        public Task<bool> UnAuthorizeAsync(byte logicalNozzleId)
        {
            return Task.FromResult(true);
        }

        public Task<bool> UnlockNozzleAsync(byte logicalNozzleId)
        {
            return Task.FromResult(true);
        }

        public void Dispose()
        {
            this.autoCallingTimer?.Dispose();
        }

        internal void DrivenPumpStateTo(byte? logicalNozzleId, LogicalDeviceState pumpNewState,
            int? amountWithoutDecimalPoint, int? volumeWithoutDecimalPoint, int? priceWithoutDecimalPoint)
        {
            var targetNozzle = this.nozzles?.FirstOrDefault(n => n.LogicalId == logicalNozzleId);
            if (pumpNewState == LogicalDeviceState.FDC_FUELLING)
            {
                this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
                {
                    Amount = amountWithoutDecimalPoint ?? 0,
                    Volumn = volumeWithoutDecimalPoint ?? 0,
                    Nozzle = targetNozzle,
                    Price = priceWithoutDecimalPoint ?? 0,
                    //SequenceNumberGeneratedOnPhysicalPump = seqNumber,
                    Finished = false
                }));
            }

            if (this.currentState == pumpNewState) return;
            this.currentState = pumpNewState;
            this.OnStateChange?.Invoke(this,
                new FdcPumpControllerOnStateChangeEventArg(this.currentState, targetNozzle));
        }

        internal void DrivenPumpRaiseNewTrx(byte? logicalNozzleId,
            int amountWithoutDecimalPoint, int volumeWithoutDecimalPoint, int priceWithoutDecimalPoint, int trxSeqNumber)
        {
            var targetNozzle = this.nozzles?.FirstOrDefault(n => n.LogicalId == logicalNozzleId);
            this.OnCurrentFuellingStatusChange?.Invoke(this, new FdcTransactionDoneEventArg(new FdcTransaction()
            {
                Amount = amountWithoutDecimalPoint,
                Volumn = volumeWithoutDecimalPoint,
                Nozzle = targetNozzle,
                Price = priceWithoutDecimalPoint,
                SequenceNumberGeneratedOnPhysicalPump = trxSeqNumber,
                Finished = true
            }));
        }
    }
}