Relative Moving Average

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using RelativeMovingAverage.Properties;

/*
This is the pineScript code for the Relative Moving Average

It's like the EMA but it uses alpha = 1/length instead of 2/(length + 1)
It gives a bit less weight (about half of EMA) to the most recent data point

//https://www.tradingview.com/pine-script-reference/v5/#fun_ta.rma
//@version=5
indicator("ta.rma")
plot(ta.rma(close, 15))

//the same on pine
pine_rma(src, length) =>
    alpha = 1/length
    sum = 0.0
    sum := na(sum[1]) ? ta.sma(src, length) : alpha * src + (1 - alpha) * nz(sum[1])
plot(pine_rma(close, 15))
 */

//You can support/contact me via Ko-Fi
//https://ko-fi.com/waxycodes

namespace cAlgo;

[Indicator(AccessRights = AccessRights.FullAccess, IsOverlay = true)]
public class RelativeMovingAverage : Indicator
{
    [Parameter("Source", DefaultValue = "Close")] 
    public DataSeries InputSource { get; set; }
    
    [Parameter("Length", DefaultValue = 15)] 
    public int InputLength { get; set; }

    [Output("Main", LineColor = "FF00FFFF", Thickness = 2)]
    public IndicatorDataSeries Result { get; set; }

    private double _alpha;
    private SimpleMovingAverage _smaSrc;

    protected override void Initialize()
    {
        _alpha = 1.0 / InputLength;
        _smaSrc = Indicators.SimpleMovingAverage(InputSource, InputLength);
        
        //Remove if needed
        //Support these and more tools for trading at
        //https://ko-fi.com/waxycodes
        //Thanks
        SetKofi();
    }

    public override void Calculate(int index)
    {
        Result[index] = double.IsNaN(Result[index - 1]) ? _smaSrc.Result[index] : _alpha * InputSource[index] + (1 - _alpha) * Nz(Result[index - 1]);
    }
    
    public double Nz(double value) => double.IsNaN(value) ? 0 : value;

    public DataSeries Open => Bars.OpenPrices;
    public DataSeries High => Bars.HighPrices;
    public DataSeries Low => Bars.LowPrices;
    public DataSeries Close => Bars.ClosePrices;
    public TimeSeries Times => Bars.OpenTimes;
    public int Index => Bars.Count - 1;

    #region KoFi

    private TextBlock _textBlock;
    private Button _button;
    private StackPanel _stack;
    private int _counter;

    private void SetKofi()
    {
        var image = new Image
        {
            // Logo is an icon file inside project resources
            Source = Resources.my_kofi_support,
            Width = 200,
            //Height = 200,
        };

        _textBlock = new TextBlock
        {
            Text = ClickTheImageBelow(10),
            FontSize = 12,
            FontWeight = FontWeight.Bold,
            ForegroundColor = Chart.ColorSettings.ForegroundColor,
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center,
            Margin = 1,
            Padding = 1,
            Width = 198,
        };

        _button = new Button
        {
            Content = image,
            BackgroundColor = Color.Transparent,

            Margin = 2,
            Padding = 0,
            CornerRadius = 0           
        };

        _stack = new StackPanel
        {
            HorizontalAlignment = HorizontalAlignment.Right,
            VerticalAlignment = VerticalAlignment.Bottom,
        };
        
        _stack.AddChild(_textBlock);
        _stack.AddChild(_button);

        _button.Click += Button_Click;

        Chart.AddControl(_stack);
        
        Timer.Start(1);
    }

    private void Button_Click(ButtonClickEventArgs obj)
    {
        Process.Start(new ProcessStartInfo
        {
            FileName = "https://ko-fi.com/waxycodes",
            UseShellExecute = true
        });
    }

    protected override void OnTimer()
    {
        _counter++;

        _textBlock.Text = ClickTheImageBelow(10 - _counter);

        if (_counter != 10) 
            return;
        
        Chart.RemoveControl(_stack);
        Timer.Stop();
    }
    
    private string ClickTheImageBelow(int seconds) => $"Click the Link Below... ({seconds})";

    #endregion
}