using System;
using QuanTAlib;
using Skender.Stock.Indicators;
using Xunit;

namespace Validations;
public class Skender {
    private readonly GBM_Feed bars;
    private readonly Random rnd = new();
    private readonly int period, digits, skip;
    private readonly IEnumerable<Quote> quotes;


    public Skender() {
        bars = new(Bars: 10000, Volatility: 0.5, Drift: 0.0, Precision: 2);
        period = rnd.Next(30) + 5;
        digits = 6; //minimizing rounding errors in type conversions
        skip = period + 2;

        quotes = bars.Select(q => new Quote {
            Date = q.t,
            Open = (decimal)q.o,
            High = (decimal)q.h,
            Low = (decimal)q.l,
            Close = (decimal)q.c,
            Volume = (decimal)q.v
        });
    }

    /*
      [Fact]
      public void ADL()
      {
        ADL_Series QL = new(bars);
        var SK = quotes.GetAdl().Select(i => i.Adl);
        for (int i = QL.Length; i > skip; i--)
        {
          double QL_item = QL[i - 1].v;
          double SK_item = SK.ElementAt(i - 1)!;
          Assert.InRange(SK_item! - QL_item, -Math.Pow(10,-digits), Math.Pow(10,-digits));
            }
      }
      */
    [Fact]
    public void ALMA() {
        ALMA_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetAlma(period).Select(i => i.Alma.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void ATR() {
        ATR_Series QL = new(bars, period: period, useNaN: false);
        var SK = quotes.GetAtr(period).Select(i => i.Atr.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void ATRP() {
        ATRP_Series QL = new(bars, period, false);
        var SK = quotes.GetAtr(period).Select(i => i.Atrp.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void BBANDS() {
        BBANDS_Series QL = new(bars.Close, period, 2.0, useNaN: false);
        var SK = quotes.GetBollingerBands(period, 2.0);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL.Mid[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Sma!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Upper[i - 1].v;
            SK_item = SK.ElementAt(i - 1).UpperBand!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Lower[i - 1].v;
            SK_item = SK.ElementAt(i - 1).LowerBand!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Bandwidth[i - 1].v;
            SK_item = SK.ElementAt(i - 1).Width!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.PercentB[i - 1].v;
            SK_item = SK.ElementAt(i - 1).PercentB!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Zscore[i - 1].v;
            SK_item = SK.ElementAt(i - 1).ZScore!.Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void CCI() {
        CCI_Series QL = new(bars, period, false);
        var SK = quotes.GetCci(period).Select(i => i.Cci.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void CMO() {
        CMO_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetCmo(period).Select(i => i.Cmo.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void CORR() {
        CORR_Series QL = new(bars.High, bars.Low, period, false);
        var SK = quotes.Use(CandlePart.High).GetCorrelation(quotes.Use(CandlePart.Low), period).Select(i => i.Correlation.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void COVAR() {
        COVAR_Series QL = new(bars.High, bars.Low, period, false);
        var SK = quotes.Use(CandlePart.High).GetCorrelation(quotes.Use(CandlePart.Low), period).Select(i => i.Covariance.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void DEMA() {
        DEMA_Series QL = new(bars.Close, period, false, useSMA: true);
        var SK = quotes.GetDema(period).Select(i => i.Dema.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void EMA() {
        EMA_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetEma(lookbackPeriods: period).Select(i => i.Ema.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void HL2() {
        TSeries QL = bars.HL2;
        var SK = quotes.GetBaseQuote(CandlePart.HL2).ToList();
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void HLC3() {
        TSeries QL = bars.HLC3;
        var SK = quotes.GetBaseQuote(CandlePart.HLC3).ToList();
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void HMA() {
        HMA_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetHma(period).Select(i => i.Hma.Null2NaN()!);
        for (int i = QL.Length; i > skip * 2; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }

    [Fact]
    public void KAMA() {
        // TODO: check precision of KAMA()
        KAMA_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetKama(period).Select(i => i.Kama.Null2NaN()!);
        for (int i = QL.Length; i > skip + 2; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void SLOPE() {
        SLOPE_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetSlope(period);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = (double)SK.ElementAt(i - 1).Slope!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Intercept[i - 1].v;
            SK_item = (double)SK.ElementAt(i - 1).Intercept!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.RSquared[i - 1].v;
            SK_item = (double)SK.ElementAt(i - 1).RSquared!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.StdDev[i - 1].v;
            SK_item = (double)SK.ElementAt(i - 1).StdDev!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void MACD() {
        MACD_Series QL = new(bars.Close, 26, 12, 9, useNaN: false);
        var SK = quotes.GetMacd(12, 26, 9);
        for (int i = QL.Length; i > 27; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Macd.Null2NaN()!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            //QL_item = QL.Signal[i - 1].v;
            //SK_item = SK.ElementAt(i - 1).Signal.Null2NaN()!;
            //Assert.InRange(SK_item! - QL_item, -Math.Pow(10,-digits), Math.Pow(10,-digits));
        }
    }
    [Fact]
    public void MAD() {
        MAD_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetSmaAnalysis(period).Select(i => i.Mad.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void MAMA() {
        MAMA_Series QL = new(bars.HL2, fastlimit: 0.5, slowlimit: 0.05);
        var SK = quotes.GetMama(fastLimit: 0.5, slowLimit: 0.05);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Mama.Null2NaN()!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
            QL_item = QL.Fama[i - 1].v;
            SK_item = SK.ElementAt(i - 1).Fama.Null2NaN()!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void MAPE() {
        MAPE_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetSmaAnalysis(period).Select(i => i.Mape.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void MSE() {
        MSE_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetSmaAnalysis(period).Select(i => i.Mse.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void OBV() {
        OBV_Series QL = new(bars, period, false);
        var SK = quotes.GetObv(period).Select(i => i.Obv!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL.Last().v;
            // adding volume[0] to OBV to pass the test and keep compatibility with TA-LIB
            double SK_item = SK.Last()! + (double)quotes.First().Volume!;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void OC2() {
        TSeries QL = bars.OC2;
        var SK = quotes.GetBaseQuote(CandlePart.OC2).ToList();
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void OHL3() {
        TSeries QL = bars.OHL3;
        var SK = quotes.GetBaseQuote(CandlePart.OHL3).ToList();
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void OHLC4() {
        TSeries QL = bars.OHLC4;
        var SK = quotes.GetBaseQuote(CandlePart.OHLC4).ToList();
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1).Value;
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void RSI() {
        RSI_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetRsi(period).Select(i => i.Rsi.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void SDEV() {
        SDEV_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetStdDev(period).Select(i => i.StdDev.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void SMA() {
        SMA_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetSma(period).Select(i => i.Sma.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void SMMA() {
        SMMA_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetSmma(period).Select(i => i.Smma.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void T3() {
        T3_Series QL = new(source: bars.Close, period: period, vfactor: 0.7, false);
        var SK = quotes.GetT3(lookbackPeriods: period, volumeFactor: 0.7).Select(i => i.T3.Null2NaN()!);
        for (int i = QL.Length; i > period * 15; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void TRIX() {
        TRIX_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetTrix(period).Select(i => i.Trix.Null2NaN()!);
        for (int i = QL.Length; i > period * 12; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void TEMA() {
        TEMA_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetTema(period).Select(i => i.Tema.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void TR() {
        TR_Series QL = new(bars);
        var SK = quotes.GetTr().Select(i => i.Tr.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void WMA() {
        WMA_Series QL = new(bars.Close, period, false);
        var SK = quotes.GetWma(period).Select(i => i.Wma.Null2NaN()!);
        for (int i = QL.Length; i > skip * 2; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }
    [Fact]
    public void ZSCORE() {
        ZSCORE_Series QL = new(bars.Close, period, useNaN: false);
        var SK = quotes.GetStdDev(period).Select(i => i.ZScore.Null2NaN()!);
        for (int i = QL.Length; i > skip; i--) {
            double QL_item = QL[i - 1].v;
            double SK_item = SK.ElementAt(i - 1);
            Assert.InRange(SK_item! - QL_item, -Math.Pow(10, -digits), Math.Pow(10, -digits));
        }
    }

}