using Grpc.Core;
using KLHZ.Trader.Core.Common.Messaging.Contracts;
using KLHZ.Trader.Core.DataLayer;
using KLHZ.Trader.Core.DataLayer.Entities.Prices;
using KLHZ.Trader.Core.Exchange.Extentions;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System.Collections.Concurrent;
using Tinkoff.InvestApi;
using Tinkoff.InvestApi.V1;
using Candle = KLHZ.Trader.Core.DataLayer.Entities.Prices.Candle;

namespace KLHZ.Trader.Core.Exchange.Services
{
    public class ExchangeDataReader : IHostedService
    {
        private readonly InvestApiClient _investApiClient;
        private readonly string[] _instrumentsFigis = [];
        private readonly string[] _managedAccountNamePatterns;
        private readonly ILogger<ExchangeDataReader> _logger;
        private readonly ConcurrentDictionary<string, string> _tickersCache = new();
        private readonly IDbContextFactory<TraderDbContext> _dbContextFactory;
        private readonly CancellationTokenSource _cts = new();
        private readonly IDataBus _eventBus;

        public ExchangeDataReader(InvestApiClient investApiClient, IDataBus eventBus,
            IOptions<ExchangeConfig> options, IDbContextFactory<TraderDbContext> dbContextFactory,
            ILogger<ExchangeDataReader> logger)
        {
            _eventBus = eventBus;
            _dbContextFactory = dbContextFactory;
            _investApiClient = investApiClient;
            _instrumentsFigis = options.Value.AllowedInstrumentsFigis.ToArray();
            _logger = logger;
            _managedAccountNamePatterns = options.Value.ManagingAccountNamePatterns.ToArray();
        }

        public async Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Инициализация приемника данных с биржи");
            var accounts = await _investApiClient.GetAccounts(_managedAccountNamePatterns);
            await InitCache();
            _ = CycleSubscribtion(accounts);
        }

        private async Task InitCache()
        {
            var shares = await _investApiClient.Instruments.SharesAsync();
            foreach (var share in shares.Instruments)
            {
                //if (_instrumentsFigis.Contains(share.Figi))
                {
                    _tickersCache.TryAdd(share.Figi, share.Ticker);
                }
            }
            var futures = await _investApiClient.Instruments.FuturesAsync();
            foreach (var future in futures.Instruments)
            {
                //if (_instrumentsFigis.Contains(future.Figi))
                {
                    _tickersCache.TryAdd(future.Figi, future.Ticker);
                }
            }
        }

        private async Task CycleSubscribtion(string[] accounts)
        {
            while (true)
            {
                try
                {
                    await SubscribePrices();
                    await Task.Delay(1000);
                    //await SubscribeCandles();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Ошибка в одном из стримов получения данных от биржи.");
                }
            }
        }

        private async Task SubscribePrices()
        {
            using var stream = _investApiClient.MarketDataStream.MarketDataStream();

            var request = new SubscribeLastPriceRequest
            {
                SubscriptionAction = SubscriptionAction.Subscribe
            };

            foreach (var f in _instrumentsFigis)
            {
                request.Instruments.Add(
                    new LastPriceInstrument()
                    {
                        InstrumentId = f
                    });
            }

            await stream.RequestStream.WriteAsync(new MarketDataRequest
            {
                SubscribeLastPriceRequest = request,
            });

            await foreach (var response in stream.ResponseStream.ReadAllAsync())
            {
                if (response.LastPrice != null)
                {
                    var message = new PriceChange()
                    {
                        Figi = response.LastPrice.Figi,
                        Ticker = GetTickerByFigi(response.LastPrice.Figi),
                        Time = response.LastPrice.Time.ToDateTime().ToUniversalTime(),
                        Value = response.LastPrice.Price,
                        IsHistoricalData = false,
                    };
                    await _eventBus.BroadcastNewPrice(message);
                    using var context = await _dbContextFactory.CreateDbContextAsync();
                    context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                    await context.PriceChanges.AddAsync(message);
                    await context.SaveChangesAsync();
                }
            }
        }

        private async Task SubscribeCandles()
        {
            using var stream = _investApiClient.MarketDataStream.MarketDataStream();

            var request = new SubscribeCandlesRequest
            {
                SubscriptionAction = SubscriptionAction.Subscribe,
                CandleSourceType = GetCandlesRequest.Types.CandleSource.Exchange
            };

            foreach (var f in _instrumentsFigis)
            {
                request.Instruments.Add(
                    new CandleInstrument()
                    {
                        InstrumentId = f,
                        Interval = SubscriptionInterval.OneMinute
                    });
            }

            await stream.RequestStream.WriteAsync(new MarketDataRequest
            {
                SubscribeCandlesRequest = request,
            });

            await foreach (var response in stream.ResponseStream.ReadAllAsync())
            {
                if (response.Candle != null)
                {
                    var message = new Candle()
                    {
                        Figi = response.Candle.Figi,
                        Ticker = GetTickerByFigi(response.LastPrice.Figi),
                        Time = response.Candle.Time.ToDateTime().ToUniversalTime(),
                        Close = response.Candle.Close,
                        Open = response.Candle.Open,
                        Low = response.Candle.Low,
                        High = response.Candle.High,
                        Volume = response.Candle.Volume,
                        IsHistoricalData = false,
                    };
                    await _eventBus.BroadcastNewCandle(message);
                    using var context = await _dbContextFactory.CreateDbContextAsync();
                    context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
                    await context.Candles.AddAsync(message);
                    await context.SaveChangesAsync();
                }
            }
        }
        private string GetTickerByFigi(string figi)
        {
            return _tickersCache.TryGetValue(figi, out var ticker) ? ticker : string.Empty;
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _cts.Cancel();
            return Task.CompletedTask;
        }
    }
}