using DnsClient.Internal;
using Managing.Application.Abstractions;
using Managing.Application.Abstractions.Repositories;
using Managing.Application.Abstractions.Services;
using Managing.Domain.Accounts;
using Managing.Domain.Scenarios;
using Managing.Domain.Statistics;
using Managing.Domain.Strategies;
using Managing.Domain.Trades;
using Managing.Domain.Shared.Helpers;
using Microsoft.Extensions.Logging;
using MongoDB.Driver;
using static Managing.Common.Enums;

namespace Managing.Application.Trading;

public class TradingService : ITradingService
{
    private readonly ITradingRepository _tradingRepository;
    private readonly IExchangeService _exchangeService;
    private readonly IAccountService _accountService;
    private readonly ICacheService _cacheService;
    private readonly IMessengerService _messengerService;
    private readonly IStatisticRepository _statisticRepository;
    private readonly ILogger<TradingService> _logger;

    public TradingService(
        ITradingRepository tradingRepository,
        IExchangeService exchangeService,
        ILogger<TradingService> logger,
        IAccountService accountService,
        ICacheService cacheService,
        IMessengerService messengerService,
        IStatisticRepository statisticRepository)
    {
        _tradingRepository = tradingRepository;
        _exchangeService = exchangeService;
        _logger = logger;
        _accountService = accountService;
        _cacheService = cacheService;
        _messengerService = messengerService;
        _statisticRepository = statisticRepository;
    }

    public void DeleteScenario(string name)
    {
        _tradingRepository.DeleteScenario(name);
    }

    public void DeleteScenarios()
    {
        _tradingRepository.DeleteScenarios();
    }

    public void DeleteStrategies()
    {
        _tradingRepository.DeleteStrategies();
    }

    public void DeleteStrategy(string name)
    {
        _tradingRepository.DeleteStrategy(name);
    }

    public Position GetPositionByIdentifier(string identifier)
    {
        return _tradingRepository.GetPositionByIdentifier(identifier);
    }

    public IEnumerable<Position> GetPositions(PositionInitiator positionInitiator)
    {
        return _tradingRepository.GetPositions(positionInitiator);
    }

    public IEnumerable<Position> GetPositionsByStatus(PositionStatus postionStatus)
    {
        return _tradingRepository.GetPositionsByStatus(postionStatus);
    }



    public Scenario GetScenarioByName(string scenario)
    {
        return _tradingRepository.GetScenarioByName(scenario);
    }

    public IEnumerable<Scenario> GetScenarios()
    {
        return _tradingRepository.GetScenarios();
    }

    public IEnumerable<Strategy> GetStrategies()
    {
        return _tradingRepository.GetStrategies();
    }

    public Strategy GetStrategyByName(string strategy)
    {
        return _tradingRepository.GetStrategyByName(strategy);
    }

    public void InsertPosition(Position position)
    {
        _tradingRepository.InsertPosition(position);
    }

    public void InsertScenario(Scenario scenario)
    {
        _tradingRepository.InsertScenario(scenario);
    }

    public void InsertSignal(Signal signal)
    {
        _tradingRepository.InsertSignal(signal);
    }

    public void InsertStrategy(Strategy strategy)
    {
        _tradingRepository.InsertStrategy(strategy);
    }

    public async Task<Position> ManagePosition(Account account, Position position)
    {
        var lastPrice = _exchangeService.GetPrice(account, position.Ticker, DateTime.UtcNow);
        var quantityInPosition = await _exchangeService.GetQuantityInPosition(account, position.Ticker);
        var orders = await _exchangeService.GetOpenOrders(account, position.Ticker);

        if (quantityInPosition > 0)
        {
            // Position still open
            position.ProfitAndLoss = TradingBox.GetProfitAndLoss(position, position.Open.Quantity, lastPrice);
            _logger.LogInformation($"Position is still open - PNL : {position.ProfitAndLoss.Realized} $");
            _logger.LogInformation($"Requested trades : {orders.Count}");
        }
        else
        {
            // No quantity in position = SL/TP hit 
            if (orders.All(o => o.TradeType != TradeType.StopLoss))
            {
                // SL hit
                _logger.LogInformation($"Stop loss is filled on exchange.");
                position.StopLoss.SetStatus(TradeStatus.Filled);
                position.ProfitAndLoss = TradingBox.GetProfitAndLoss(position, position.StopLoss.Quantity, position.StopLoss.Price);
                _ = _exchangeService.CancelOrder(account, position.Ticker);
            }
            else if (orders.All(o => o.TradeType != TradeType.TakeProfit))
            {
                // TP Hit
                if (position.TakeProfit1.Status == TradeStatus.Filled && position.TakeProfit2 != null)
                {
                    position.TakeProfit2.SetStatus(TradeStatus.Filled);
                    position.ProfitAndLoss = TradingBox.GetProfitAndLoss(position, position.TakeProfit2.Quantity, position.TakeProfit2.Price);
                    _logger.LogInformation($"TakeProfit 2 is filled on exchange.");
                }
                else
                {
                    position.TakeProfit1.SetStatus(TradeStatus.Filled);
                    position.ProfitAndLoss = TradingBox.GetProfitAndLoss(position, position.TakeProfit1.Quantity, position.TakeProfit1.Price);
                    _logger.LogInformation($"TakeProfit 1 is filled on exchange.");
                }
            }
            else
            {
                _logger.LogInformation($"Position closed manually or forced close by exchange because quantity in position is below 0.");
                position.Status = PositionStatus.Finished;

                if (orders.Any()) await _exchangeService.CancelOrder(account, position.Ticker);
            }
        }

        return position;
    }

    public void UpdateFee(TradingExchanges exchange)
    {
        var lastFee = _tradingRepository.GetFee(exchange);
        var account = _accountService.GetAccounts(false, false).FirstOrDefault(a => a.Exchange == exchange);
        if (lastFee != null)
        {
            if (DateTime.UtcNow.AddHours(-6) >= lastFee.LastUpdate)
            {
                lastFee.Cost = _exchangeService.GetFee(account);
                lastFee.LastUpdate = DateTime.UtcNow;
                _tradingRepository.UpdateFee(lastFee);
            }
        }
        else
        {
            lastFee = new Fee
            {
                Cost = _exchangeService.GetFee(account),
                Exchange = exchange,
                LastUpdate = DateTime.UtcNow
            };

            _tradingRepository.InsertFee(lastFee);
        }
    }

    public decimal GetFee(Account account, bool isForPaperTrading = false)
    {
        if (isForPaperTrading && account.Exchange != TradingExchanges.Evm)
        {
            return 0.000665M;
        }

        return _cacheService.GetOrSave($"Fee-{account.Exchange}", () =>
        {
            return _tradingRepository.GetFee(TradingExchanges.Evm).Cost;
        }, TimeSpan.FromHours(2));
    }

    public void UpdatePosition(Position position)
    {
        _tradingRepository.UpdatePosition(position);
    }

    public IEnumerable<Position> GetPositions()
    {
        var positions = new List<Position>();
        positions.AddRange(GetPositionsByStatus(PositionStatus.New));
        positions.AddRange(GetPositionsByStatus(PositionStatus.Filled));
        positions.AddRange(GetPositionsByStatus(PositionStatus.PartiallyFilled));
        return positions;
    }


    public async Task WatchTrader()
    {
        var availableTickers = new List<Ticker> { Ticker.BTC, Ticker.ETH, Ticker.UNI, Ticker.LINK };
        var watchAccount = GetTradersWatch();
        var key = $"AccountsQuantityInPosition";
        var aqip = _cacheService.GetValue<List<TraderFollowup>>(key);

        if (aqip == null)
        {
            aqip = GetAccountsQuantityInPosition(watchAccount);
        }
        else
        {
            foreach (var a in watchAccount.Where(w => !aqip.Any(a => a.Account.Address == w.Address)))
            {
                var newAccount = SetupFollowUp(a);
                aqip.Add(newAccount);
            }

            foreach (var a in aqip)
            {
                await ManageTrader(a, availableTickers);
            }

        }

        _cacheService.SaveValue(key, aqip, TimeSpan.FromMinutes(10));
    }

    public IEnumerable<Trader> GetTradersWatch()
    {
        var watchAccount = _statisticRepository.GetBestTraders();
        var customWatchAccount = _accountService.GetAccounts(true, false).Where(a => a.Type == AccountType.Watch).ToList().MapToTraders();
        watchAccount.AddRange(customWatchAccount.Where(a => !watchAccount.Any(w => w.Address.Equals(a.Address, StringComparison.InvariantCultureIgnoreCase))));
        return watchAccount;
    }

    private async Task ManageTrader(TraderFollowup a, List<Ticker> tickers)
    {
        var shortAddress = a.Account.Address.Substring(0, 6);

        foreach (var ticker in tickers)
        {
            try
            {
                var newTrade = await _exchangeService.GetTrade(a.Account.Address, "", ticker);
                var oldTrade = a.Trades.SingleOrDefault(t => t.Ticker == ticker);
                if (newTrade == null)
                {
                    if (oldTrade != null)
                    {
                        _logger.LogInformation($"[{shortAddress}][{ticker}] Trader previously got a position open but the position was close by trader");
                        await _messengerService.SendClosedPosition(a.Account.Address, oldTrade);
                        a.Trades.Remove(oldTrade);
                    }
                }
                else if ((newTrade != null && oldTrade == null) || (newTrade.Quantity > oldTrade.Quantity))
                {
                    _logger.LogInformation($"[{shortAddress}][{ticker}] Trader increase {newTrade.Direction} by {newTrade.Quantity - (oldTrade?.Quantity ?? 0)} with leverage {newTrade.Leverage} at {newTrade.Price} leverage.");

                    var index = a.Trades.IndexOf(oldTrade);
                    if (index != -1)
                    {
                        a.Trades[index] = newTrade;
                    }
                    else
                    {
                        a.Trades.Add(newTrade);
                    }

                    // Open position
                    await _messengerService.SendIncreasePosition(a.Account.Address, newTrade, "Test6", oldTrade);
                    // Save position to cache
                }
                else if (newTrade.Quantity < oldTrade.Quantity && newTrade.Quantity > 0)
                {
                    var decreaseAmount = oldTrade.Quantity - newTrade.Quantity;
                    var index = a.Trades.IndexOf(oldTrade);
                    a.Trades[index] = newTrade;
                    _logger.LogInformation($"[{a.Account.Address.Substring(0, 6)}][{ticker}] Trader decrease position but didnt close it {decreaseAmount}");
                    await _messengerService.SendDecreasePosition(a.Account.Address, newTrade, decreaseAmount);
                }
                else
                {
                    _logger.LogInformation($"[{shortAddress}][{ticker}] No change - Quantity still {newTrade.Quantity}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"[{shortAddress}][{ticker}] Impossible to fetch trader");
            }
        }
    }

    private List<TraderFollowup> GetAccountsQuantityInPosition(IEnumerable<Trader> watchAccount)
    {
        var result = new List<TraderFollowup> ();
        foreach (var account in watchAccount)
        {
            var trader = SetupFollowUp(account);
            result.Add(trader);
        }

        return result;
    }

    private static TraderFollowup SetupFollowUp(Trader account)
    {
        var trader = new TraderFollowup
        {
            Account = account,
            Trades = new List<Trade>(),
            PositionIdentifiers = new List<string>()
        };

        return trader;
    }

    public class TraderFollowup
    {
        public Trader Account { get; set; }
        public List<Trade> Trades { get; set; }
        public List<string> PositionIdentifiers { get; set; }
    }
}