using KLHZ.Trader.Core.Contracts.Messaging.Dtos;
using KLHZ.Trader.Core.Contracts.Messaging.Dtos.Interfaces;
using KLHZ.Trader.Core.DataLayer;
using KLHZ.Trader.Core.DataLayer.Entities.Declisions;
using KLHZ.Trader.Core.DataLayer.Entities.Declisions.Enums;
using KLHZ.Trader.Core.DataLayer.Entities.Prices;
using KLHZ.Trader.Core.Exchange.Models.Configs;
using KLHZ.Trader.Core.Math.Declisions.Services.Cache;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System.Collections.Concurrent;
using System.Threading.Channels;
using Tinkoff.InvestApi;
using AssetType = KLHZ.Trader.Core.Exchange.Models.AssetsAccounting.AssetType;

namespace KLHZ.Trader.Core.Exchange.Services
{
    public class TraderDataProvider
    {
        private readonly ConcurrentDictionary<string, PriceHistoryCacheUnit3> _historyCash3 = new();

        private readonly InvestApiClient _investApiClient;
        private readonly IDbContextFactory<TraderDbContext> _dbContextFactory;
        private readonly ILogger<TraderDataProvider> _logger;
        private readonly string[] _instrumentsFigis = [];
        private readonly string[] _tradingInstrumentsFigis = [];

        public readonly ConcurrentDictionary<string, IOrderbook> Orderbooks = new();
        private readonly ConcurrentDictionary<string, string> _tickersCache = new();
        private readonly ConcurrentDictionary<string, AssetType> _assetTypesCache = new();

        private readonly bool _isDataRecievingAllowed = false;
        private readonly Channel<object> _forSave = Channel.CreateUnbounded<object>();

        private readonly SemaphoreSlim _initSemaphore = new SemaphoreSlim(1, 1);

        public TraderDataProvider(InvestApiClient investApiClient, IOptions<ExchangeConfig> options, IDbContextFactory<TraderDbContext> dbContextFactory, ILogger<TraderDataProvider> logger)
        {
            _investApiClient = investApiClient;
            _dbContextFactory = dbContextFactory;
            _logger = logger;
            _instrumentsFigis = options.Value.DataRecievingInstrumentsFigis.ToArray();
            _tradingInstrumentsFigis = options.Value.TradingInstrumentsFigis.ToArray();
            _isDataRecievingAllowed = options.Value.ExchangeDataRecievingEnabled;
        }

        public async ValueTask<decimal> GetLastPrice(string figi)
        {
            var res = 0m;
            if (_historyCash3.TryGetValue(figi, out var unit))
            {
                res = (await unit.GetLastValues()).price;
            }
            return res;
        }

        public async ValueTask AddData(ITradeDataItem message)
        {
            if (message.Direction != 1) return;
            if (_historyCash3.TryGetValue(message.Figi, out var unit))
            {
                await unit.AddData(message);
            }
            else
            {
                unit = new PriceHistoryCacheUnit3(message.Figi, message);
                _historyCash3.TryAdd(message.Figi, unit);
            }
        }

        public async ValueTask AddData(string figi, string key, ITradeDataItem data)
        {
            if (!_historyCash3.TryGetValue(figi, out var item))
            {
                item = new PriceHistoryCacheUnit3(figi);
                _historyCash3.TryAdd(figi, item);
            }

            await _historyCash3[figi].AddData(data, key);
        }

        public ValueTask<ITradeDataItem[]> GetDataForTimeWindow(string figi, TimeSpan time, string? key = null, Func<ITradeDataItem, bool>? selector = null)
        {
            if (_historyCash3.TryGetValue(figi, out var cahcheItem))
            {
                return cahcheItem.GetData(time, key: key, selector);
            }
            return ValueTask.FromResult(Array.Empty<ITradeDataItem>());
        }

        public async ValueTask AddOrderbook(IOrderbook orderbook)
        {
            if (!_historyCash3.TryGetValue(orderbook.Figi, out var unit))
            {
                unit = new PriceHistoryCacheUnit3(orderbook.Figi);
                _historyCash3.TryAdd(orderbook.Figi, unit);
            }
            Orderbooks[orderbook.Figi] = orderbook;
            await unit.AddOrderbook(orderbook);
        }

        public async Task Init()
        {
            try
            {
                var cts = new CancellationTokenSource(TimeSpan.FromSeconds(3));
                await _initSemaphore.WaitAsync(cts.Token);
                var shares = await _investApiClient.Instruments.SharesAsync();
                foreach (var share in shares.Instruments)
                {
                    if (_instrumentsFigis.Contains(share.Figi))
                    {
                        _tickersCache.TryAdd(share.Figi, share.Ticker);
                        _assetTypesCache.TryAdd(share.Figi, AssetType.Common);
                    }
                }
                var futures = await _investApiClient.Instruments.FuturesAsync();
                foreach (var future in futures.Instruments)
                {
                    if (_instrumentsFigis.Contains(future.Figi))
                    {
                        _tickersCache.TryAdd(future.Figi, future.Ticker);
                        _assetTypesCache.TryAdd(future.Figi, AssetType.Futures);
                    }
                }

                if (_isDataRecievingAllowed)
                {
                    var time = DateTime.UtcNow.AddHours(-20);
                    using var context1 = await _dbContextFactory.CreateDbContextAsync();
                    context1.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                    var data = await context1.PriceChanges
                        .Where(c => _tradingInstrumentsFigis.Contains(c.Figi) && c.Time >= time)
                        .OrderBy(c => c.Time)
                        .Select(c => new TradeDataItem()
                        {
                            Figi = c.Figi,
                            Ticker = c.Ticker,
                            Time = c.Time,
                            Price = c.Price,
                            IsHistoricalData = true,
                            Direction = c.Direction,
                            Count = c.Count,
                        })
                        .ToArrayAsync();

                    foreach (var price in data)
                    {
                        await AddData(price);
                    }
                }

                _ = WritePricesTask();
            }
            catch (Exception ex)
            {

            }
        }

        public string GetTickerByFigi(string figi)
        {
            return _tickersCache.TryGetValue(figi, out var ticker) ? ticker : string.Empty;
        }
        public AssetType GetAssetTypeByFigi(string figi)
        {
            return _assetTypesCache.TryGetValue(figi, out var t) ? t : AssetType.Unknown;
        }
        internal async Task LogPrice(ProcessedPrice price, bool saveImmediately)
        {
            if (saveImmediately)
            {
                using var context = await _dbContextFactory.CreateDbContextAsync();
                context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                await context.ProcessedPrices.AddRangeAsync(price);
                await context.SaveChangesAsync();
            }
            else
            {
                await _forSave.Writer.WriteAsync(price);
            }
        }
        internal async Task LogDeclision(Declision declision, bool saveImmediately)
        {
            if (saveImmediately)
            {
                using var context = await _dbContextFactory.CreateDbContextAsync();
                context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                await context.Declisions.AddRangeAsync(declision);
                await context.SaveChangesAsync();
            }
            else
            {
                await _forSave.Writer.WriteAsync(declision);
            }
        }

        internal async Task LogPrice(ITradeDataItem message, string processor, decimal value)
        {
            await LogPrice(new ProcessedPrice()
            {
                Figi = message.Figi,
                Ticker = message.Ticker,
                Processor = processor,
                Time = message.Time,
                Price = value,
            }, false);
        }

        internal async Task LogPrice(string figi, string ticker, DateTime time, decimal value, string processor)
        {
            await LogPrice(new ProcessedPrice()
            {
                Figi = figi,
                Ticker = ticker,
                Processor = processor,
                Time = time,
                Price = value,
            }, false);
        }

        internal async Task LogDeclision(DeclisionTradeAction action, ITradeDataItem message, decimal? profit = null)
        {
            await LogDeclision(new Declision()
            {
                AccountId = string.Empty,
                Figi = message.Figi,
                Ticker = message.Ticker,
                Value = profit,
                Price = message.Price,
                Time = message.IsHistoricalData ? message.Time : DateTime.UtcNow,
                Action = action,
            }, false);
        }

        internal async Task LogDeclision(DeclisionTradeAction action, decimal price, DateTime time, ITradeDataItem message)
        {
            await LogDeclision(new Declision()
            {
                AccountId = string.Empty,
                Figi = message.Figi,
                Ticker = message.Ticker,
                Value = price,
                Price = price,
                Time = time,
                Action = action,
            }, false);
        }

        private async Task WritePricesTask()
        {
            var buffer1 = new List<ProcessedPrice>();
            var buffer2 = new List<Declision>();
            while (await _forSave.Reader.WaitToReadAsync())
            {
                try
                {
                    var obj = await _forSave.Reader.ReadAsync();
                    if (obj is ProcessedPrice price)
                    {
                        buffer1.Add(price);
                    }
                    if (obj is Declision dec)
                    {
                        buffer2.Add(dec);
                    }
                    if ((buffer1.Count + buffer2.Count) > 50000 || _forSave.Reader.Count == 0)
                    {
                        using var context = await _dbContextFactory.CreateDbContextAsync();
                        context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                        if (buffer1.Count > 0)
                        {
                            await context.ProcessedPrices.AddRangeAsync(buffer1);
                        }
                        if (buffer2.Count > 0)
                        {
                            await context.Declisions.AddRangeAsync(buffer2);
                        }

                        await context.SaveChangesAsync();
                        buffer1.Clear();
                        buffer2.Clear();
                    }
                }
                catch (Exception ex)
                {

                }
            }
        }
    }
}