McGinley Dynamic

//Formula for McGinley Dynamic can be found here
//https://www.investopedia.com/terms/m/mcginley-dynamic.asp

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//https://ko-fi.com/waxycodes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo;

[Indicator(AccessRights = AccessRights.None, IsOverlay = true)]
public class McGinleyDynamic : Indicator
{
    [Parameter("Source")] 
    public DataSeries InputSource { get; set; }

    [Parameter("Length", DefaultValue = 10)] 
    public int InputLength { get; set; }

    [Parameter("Constant", DefaultValue = 1, MinValue = 0.01)]
    public double InputConstant { get; set; }
    
    [Output("Main", LineColor = "FF00FFFF", Thickness = 2)]
    public IndicatorDataSeries Result { get; set; }

    private ExponentialMovingAverage _ema;

    protected override void Initialize()
    {
        _ema = Indicators.ExponentialMovingAverage(InputSource, InputLength);
    }

    public override void Calculate(int index)
    {
        var previous = double.IsNaN(Result[index - 1]) ? _ema.Result[index - 1] : Result[index - 1];
        
        Result[index] = previous + (InputSource[index] - previous) / (InputConstant * InputLength * Math.Pow(InputSource[index] / previous, 4));
    }
}