using KLHZ.Trader.Core.Contracts.Declisions.Dtos;
using KLHZ.Trader.Core.Contracts.Declisions.Dtos.Enums;
using KLHZ.Trader.Core.Contracts.Declisions.Interfaces;
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.Prices;
using KLHZ.Trader.Core.Exchange.Models.Configs;
using KLHZ.Trader.Core.Math.Declisions.Dtos.FFT;
using KLHZ.Trader.Core.Math.Declisions.Services.Cache;
using KLHZ.Trader.Core.Math.Declisions.Utils;
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, IPriceHistoryCacheUnit> _historyCash = new();

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

        private readonly ConcurrentDictionary<string, FFTAnalyzeResult> _fftResults = 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();
            _isDataRecievingAllowed = options.Value.ExchangeDataRecievingEnabled;
        }

        public ValueTask<FFTAnalyzeResult> GetFFtResult(string figi)
        {
            if (_fftResults.TryGetValue(figi, out var res))
            {
                return ValueTask.FromResult(res);
            }
            return ValueTask.FromResult<FFTAnalyzeResult>(FFTAnalyzeResult.Empty);
        }

        public ValueTask SetFFtResult(FFTAnalyzeResult result)
        {
            _fftResults[result.Key] = result;
            return ValueTask.CompletedTask;
        }

        public async ValueTask<(DateTime[] timestamps, decimal[] prices, bool isFullIntervalExists)> GetData(string figi, TimeSpan timeSpan)
        {
            if (_historyCash.TryGetValue(figi, out var unit))
            {
                var res = await unit.GetData(timeSpan);
                return (res.timestamps, res.prices, res.isFullIntervalExists);
            }
            return (Array.Empty<DateTime>(), Array.Empty<decimal>(), false);
        }

        public async ValueTask<(DateTime[] timestamps, decimal[] prices)> GetData(string figi, int? length = null)
        {
            if (_historyCash.TryGetValue(figi, out var unit))
            {
                var res = await unit.GetData(length);
                return (res.timestamps, res.prices);
            }
            return (Array.Empty<DateTime>(), Array.Empty<decimal>());
        }

        public async ValueTask AddData(INewPrice message, TimeSpan? clearingInterval = null)
        {
            if (message.Direction != 1) return;
            if (_historyCash.TryGetValue(message.Figi, out var unit))
            {
                if (clearingInterval.HasValue)
                {
                    var lasts = await unit.GetLastValues();
                    if (message.Time - lasts.time > clearingInterval.Value)
                    {
                        unit = new PriceHistoryCacheUnit2(message.Figi);
                        _historyCash[message.Figi] = unit;
                    }
                }
                await unit.AddData(message);
            }
            else
            {
                unit = new PriceHistoryCacheUnit2(message.Figi, message);
                _historyCash.TryAdd(message.Figi, unit);
            }
        }

        public async ValueTask AddDataTo1MinuteWindowCache(string figi, string key, CachedValue data)
        {
            if (!_historyCash.TryGetValue(figi, out var unit))
            {
                unit = new PriceHistoryCacheUnit2(figi);
                _historyCash.TryAdd(figi, unit);
            }
            await _historyCash[figi].AddDataToTimeWindowCache(key, data, TimeWindowCacheType._1_Minute);
        }

        public async ValueTask AddDataTo5MinuteWindowCache(string figi, string key, CachedValue data)
        {
            if (!_historyCash.TryGetValue(figi, out var unit))
            {
                unit = new PriceHistoryCacheUnit2(figi);
                _historyCash.TryAdd(figi, unit);
            }
            await _historyCash[figi].AddDataToTimeWindowCache(key, data, TimeWindowCacheType._5_Minutes);
        }

        public ValueTask<CachedValue[]> GetDataFrom1MinuteWindowCache(string figi, string key)
        {
            if (_historyCash.TryGetValue(figi, out var cahcheItem))
            {
                return cahcheItem.GetDataFromTimeWindowCache(key, TimeWindowCacheType._1_Minute);
            }
            return ValueTask.FromResult(Array.Empty<CachedValue>());
        }

        public ValueTask<CachedValue[]> GetDataFrom5MinuteWindowCache(string figi, string key)
        {
            if (_historyCash.TryGetValue(figi, out var cahcheItem))
            {
                return cahcheItem.GetDataFromTimeWindowCache(key, TimeWindowCacheType._5_Minutes);
            }
            return ValueTask.FromResult(Array.Empty<CachedValue>());
        }

        public async ValueTask AddOrderbook(IOrderbook orderbook)
        {
            if (!_historyCash.TryGetValue(orderbook.Figi, out var unit))
            {
                unit = new PriceHistoryCacheUnit2(orderbook.Figi);
                _historyCash.TryAdd(orderbook.Figi, unit);
            }

            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(-1.5);
                    using var context1 = await _dbContextFactory.CreateDbContextAsync();
                    context1.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                    var data = await context1.PriceChanges
                        .Where(c => _instrumentsFigis.Contains(c.Figi) && c.Time >= time)
                        .OrderBy(c => c.Time)
                        .Select(c => new NewPriceMessage()
                        {
                            Figi = c.Figi,
                            Ticker = c.Ticker,
                            Time = c.Time,
                            Value = c.Value,
                            IsHistoricalData = true,
                            Direction = c.Direction,
                            Count = c.Count,
                        })
                        .ToArrayAsync();

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

                        var cachedData = await GetData(price.Figi);
                        if ((DateTime.UtcNow - price.Time).TotalMinutes < 5)
                        {
                            if (ShapeAreaCalculator.TryGetAreasRelation(cachedData.timestamps, cachedData.prices, price.Value, Constants.AreasRelationWindow, out var rel))
                            {
                                await AddDataTo1MinuteWindowCache(price.Figi, Constants._1minCacheKey, new CachedValue() { Time = price.Time, Value = (decimal)rel });
                            }
                        }
                    }
                }

                _ = 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);
            }
        }
        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)
                {

                }
            }
        }
    }
}