using Managing.Core;
using Managing.Domain.Candles;
using Managing.Domain.Indicators;
using Managing.Domain.Shared.Rules;
using Managing.Domain.Strategies.Base;
using Skender.Stock.Indicators;
using static Managing.Common.Enums;

namespace Managing.Domain.Strategies.Trends;

public class IchimokuKumoTrend : IndicatorBase
{
    public List<LightSignal> Signals { get; set; }

    public IchimokuKumoTrend(
        string name,
        int tenkanPeriods = 9,
        int kijunPeriods = 26,
        int senkouBPeriods = 52,
        int offsetPeriods = 26,
        int? senkouOffset = null,
        int? chikouOffset = null) : base(name, IndicatorType.IchimokuKumoTrend)
    {
        Signals = new List<LightSignal>();
        TenkanPeriods = tenkanPeriods;  // Tenkan-sen periods
        KijunPeriods = kijunPeriods;    // Kijun-sen periods
        SenkouBPeriods = senkouBPeriods; // Senkou Span B periods
        OffsetPeriods = offsetPeriods;   // Default offset periods
        SenkouOffset = senkouOffset;     // Separate offset for Senkou span
        ChikouOffset = chikouOffset;     // Separate offset for Chikou span
    }

    public override List<LightSignal> Run(HashSet<Candle> candles)
    {
        // Need at least the greater of tenkanPeriods, kijunPeriods, senkouBPeriods, and all offset periods
        var maxOffset = Math.Max(Math.Max(OffsetPeriods.Value, SenkouOffset ?? OffsetPeriods.Value), ChikouOffset ?? OffsetPeriods.Value);
        var minRequired = Math.Max(Math.Max(Math.Max(TenkanPeriods.Value, KijunPeriods.Value), SenkouBPeriods.Value), maxOffset);
        if (candles.Count <= minRequired)
        {
            return null;
        }

        try
        {
            var ichimokuResults = CalculateIchimoku(candles.ToList());
            if (ichimokuResults.Count == 0)
                return null;

            ProcessKumoTrendSignals(ichimokuResults, candles);

            return Signals.ToList();
        }
        catch (RuleException)
        {
            return null;
        }
    }

    public override List<LightSignal> Run(HashSet<Candle> candles, IndicatorsResultBase preCalculatedValues)
    {
        // Need at least the greater of tenkanPeriods, kijunPeriods, senkouBPeriods, and all offset periods
        var maxOffset = Math.Max(Math.Max(OffsetPeriods.Value, SenkouOffset ?? OffsetPeriods.Value), ChikouOffset ?? OffsetPeriods.Value);
        var minRequired = Math.Max(Math.Max(Math.Max(TenkanPeriods.Value, KijunPeriods.Value), SenkouBPeriods.Value), maxOffset);
        if (candles.Count <= minRequired)
        {
            return null;
        }

        try
        {
            List<IchimokuResult> ichimokuResults = null;

            // Use pre-calculated Ichimoku values if available
            if (preCalculatedValues?.Ichimoku != null && preCalculatedValues.Ichimoku.Any())
            {
                // Filter pre-calculated Ichimoku values to match the candles we're processing
                ichimokuResults = preCalculatedValues.Ichimoku
                    .Where(i => i.SenkouSpanA.HasValue && i.SenkouSpanB.HasValue && candles.Any(c => c.Date == i.Date))
                    .ToList();
            }

            // If no pre-calculated values or they don't match, fall back to regular calculation
            if (ichimokuResults == null || !ichimokuResults.Any())
            {
                return Run(candles);
            }

            ProcessKumoTrendSignalsFromResults(ichimokuResults, candles);

            return Signals.ToList();
        }
        catch (RuleException)
        {
            return null;
        }
    }

    private List<CandleIchimoku> CalculateIchimoku(List<Candle> candles)
    {
        // Use Skender.Stock.Indicators GetIchimoku method with all supported parameters
        IEnumerable<IchimokuResult> ichimokuResults;

        // Use the appropriate overload based on which parameters are specified
        if (SenkouOffset.HasValue && ChikouOffset.HasValue)
        {
            // Use separate offsets for Senkou and Chikou spans
            ichimokuResults = candles.GetIchimoku(
                tenkanPeriods: TenkanPeriods.Value,
                kijunPeriods: KijunPeriods.Value,
                senkouBPeriods: SenkouBPeriods.Value,
                senkouOffset: SenkouOffset.Value,
                chikouOffset: ChikouOffset.Value
            );
        }
        else
        {
            // Use default offsetPeriods for both Senkou and Chikou spans
            ichimokuResults = candles.GetIchimoku(
                tenkanPeriods: TenkanPeriods.Value,
                kijunPeriods: KijunPeriods.Value,
                senkouBPeriods: SenkouBPeriods.Value,
                offsetPeriods: OffsetPeriods.Value
            );
        }

        var ichimokuList = ichimokuResults.ToList();

        var candleIchimokuResults = new List<CandleIchimoku>();

        // Map IchimokuResult to CandleIchimoku
        foreach (var ichimoku in ichimokuList)
        {
            // Find the corresponding candle
            var candle = candles.FirstOrDefault(c => c.Date == ichimoku.Date);
            if (candle == null) continue;

            candleIchimokuResults.Add(new CandleIchimoku()
            {
                Close = candle.Close,
                Open = candle.Open,
                Date = candle.Date,
                Ticker = candle.Ticker,
                Exchange = candle.Exchange,
                TenkanSen = ichimoku.TenkanSen ?? 0,
                KijunSen = ichimoku.KijunSen ?? 0,
                SenkouSpanA = ichimoku.SenkouSpanA ?? 0,
                SenkouSpanB = ichimoku.SenkouSpanB ?? 0
            });
        }

        return candleIchimokuResults;
    }

    private void ProcessKumoTrendSignals(List<CandleIchimoku> ichimokuResults, HashSet<Candle> candles)
    {
        var mappedData = ichimokuResults;

        if (mappedData.Count == 0)
            return;

        var previousCandle = mappedData[0];
        foreach (var currentCandle in mappedData.Skip(1))
        {
            // For trend assessment, check if price is above or below the cloud
            // The cloud is formed by Senkou Span A and Senkou Span B
            var cloudTop = Math.Max(currentCandle.SenkouSpanA, currentCandle.SenkouSpanB);
            var cloudBottom = Math.Min(currentCandle.SenkouSpanA, currentCandle.SenkouSpanB);

            if (currentCandle.Close > cloudTop)
            {
                AddSignal(currentCandle, TradeDirection.Long, Confidence.None);
            }
            else if (currentCandle.Close < cloudBottom)
            {
                AddSignal(currentCandle, TradeDirection.Short, Confidence.None);
            }
            // If price is within the cloud, no signal (neutral)

            previousCandle = currentCandle;
        }
    }

    private void ProcessKumoTrendSignalsFromResults(List<IchimokuResult> ichimokuResults, HashSet<Candle> candles)
    {
        if (ichimokuResults.Count == 0)
            return;

        var previousResult = ichimokuResults[0];
        foreach (var currentResult in ichimokuResults.Skip(1))
        {
            // Find the corresponding candle
            var candle = candles.FirstOrDefault(c => c.Date == currentResult.Date);
            if (candle == null || !currentResult.SenkouSpanA.HasValue || !currentResult.SenkouSpanB.HasValue)
                continue;

            // For trend assessment, check if price is above or below the cloud
            // The cloud is formed by Senkou Span A and Senkou Span B
            var cloudTop = Math.Max(currentResult.SenkouSpanA.Value, currentResult.SenkouSpanB.Value);
            var cloudBottom = Math.Min(currentResult.SenkouSpanA.Value, currentResult.SenkouSpanB.Value);

            if (candle.Close > cloudTop)
            {
                AddSignal(candle, TradeDirection.Long, Confidence.None);
            }
            else if (candle.Close < cloudBottom)
            {
                AddSignal(candle, TradeDirection.Short, Confidence.None);
            }
            // If price is within the cloud, no signal (neutral)

            previousResult = currentResult;
        }
    }

    public override IndicatorsResultBase GetIndicatorValues(HashSet<Candle> candles)
    {
        IEnumerable<IchimokuResult> ichimokuResults;

        // Use the appropriate overload based on which parameters are specified
        if (SenkouOffset.HasValue && ChikouOffset.HasValue)
        {
            // Use separate offsets for Senkou and Chikou spans
            ichimokuResults = candles.GetIchimoku(
                tenkanPeriods: TenkanPeriods.Value,
                kijunPeriods: KijunPeriods.Value,
                senkouBPeriods: SenkouBPeriods.Value,
                senkouOffset: SenkouOffset.Value,
                chikouOffset: ChikouOffset.Value
            );
        }
        else
        {
            // Use default offsetPeriods for both Senkou and Chikou spans
            ichimokuResults = candles.GetIchimoku(
                tenkanPeriods: TenkanPeriods.Value,
                kijunPeriods: KijunPeriods.Value,
                senkouBPeriods: SenkouBPeriods.Value,
                offsetPeriods: OffsetPeriods.Value
            );
        }

        return new IndicatorsResultBase()
        {
            Ichimoku = ichimokuResults.ToList()
        };
    }

    private void AddSignal(CandleIchimoku candleSignal, TradeDirection direction, Confidence confidence)
    {
        var signal = new LightSignal(
            candleSignal.Ticker,
            direction,
            confidence,
            candleSignal,
            candleSignal.Date,
            candleSignal.Exchange,
            Type,
            SignalType,
            Name);
        if (!Signals.Any(s => s.Identifier == signal.Identifier))
        {
            Signals.AddItem(signal);
        }
    }

    private void AddSignal(Candle candleSignal, TradeDirection direction, Confidence confidence)
    {
        var signal = new LightSignal(
            candleSignal.Ticker,
            direction,
            confidence,
            candleSignal,
            candleSignal.Date,
            candleSignal.Exchange,
            Type,
            SignalType,
            Name);
        if (!Signals.Any(s => s.Identifier == signal.Identifier))
        {
            Signals.AddItem(signal);
        }
    }

    private class CandleIchimoku : Candle
    {
        public decimal TenkanSen { get; set; }
        public decimal KijunSen { get; set; }
        public decimal SenkouSpanA { get; set; }
        public decimal SenkouSpanB { get; set; }
    }
}