#!meta

{"kernelInfo":{"defaultKernelName":"csharp","items":[{"aliases":[],"name":"csharp"}]}}

#!csharp

#r ".\bin\Debug\calculations.dll"
using QuanTAlib;

#!csharp

public class CircularBuffer
{
    private double[] _buffer;
    private int _start;
    private int _size;

    public CircularBuffer(int capacity)
    {
        _buffer = new double[capacity];
        _start = 0;
        _size = 0;
    }

    public int Capacity => _buffer.Length;
    public int Count => _size;

    public void Add(double item, bool isNew)
    {
        if (!isNew)
        {
            // Add new item
            if (_size < Capacity)
            {
                _buffer[(_start + _size) % Capacity] = item;
                _size++;
            }
            else
            {
                _start = (_start + 1) % Capacity;
                _buffer[(_start + _size - 1) % Capacity] = item;
            }
        }
        else
        {
            // Update the last item
            if (_size > 0)
            {
                _buffer[(_start + _size - 1) % Capacity] = item;
            }
            else
            {
                // If buffer is empty, add the item even if isNew is true
                _buffer[0] = item;
                _size = 1;
            }
        }
    }

    public double this[int index]
    {
        get
        {
            if (index < 0 || index >= _size)
                throw new IndexOutOfRangeException();
            return _buffer[(_start + index) % Capacity];
        }
        set
        {
            if (index < 0 || index >= _size)
                throw new IndexOutOfRangeException();
            _buffer[(_start + index) % Capacity] = value;
        }
    }
}

#!csharp

public class SMA1
{
    private CircularBuffer buffer;
    private int period;
    private double sum;
    public TValue Value { get; private set; }
    public bool IsHot => buffer.Count >= period;

    public SMA1(int period)
    {
        Init(period);
    }

    public void Init(int period)
    {
        this.period = period;
        this.buffer = new CircularBuffer(period);
        this.sum = 0;
        this.Value = default;
    }

    public TValue Update(TValue input, bool isNew = true)
    {
        if (!isNew)
        {
            if (buffer.Count == period)
            {
                sum -= buffer[0];
            }
            sum += input.Value;
            buffer.Add(input.Value, isNew);
        }
        else
        {
            if (buffer.Count > 0)
            {
                sum -= buffer[buffer.Count - 1];
                sum += input.Value;
                buffer.Add(input.Value, isNew);
            }
            else
            {
                // If buffer is empty, add the item even if isNew is true
                sum += input.Value;
                buffer.Add(input.Value, false);
            }
        }

        double sma = buffer.Count > 0 ? sum / buffer.Count : double.NaN;
        Value = new TValue(input.Time, sma, isNew, IsHot);
        return Value;
    }
}

#!csharp

GBM_Feed feed = new(initialPrice: 100, mu: 0.1, sigma: 0.9);
int i=10;
SMA1 ma = new(i);
Console.WriteLine($"{"Close",10}   {"MA(" + i + ")",10}");
for (int i = 0; i < 20; i++)
{
    TValue c =(double)feed.Generate().Close;
    ma.Update(1000,false);
     ma.Update(-10000,false);

    ma.Update(c,true);

    Console.WriteLine($"{i+1}  {(double)c,10:F2}   {(double)ma.Value,10:F2}");
}

#!csharp

public class Emitter {
    private Random random = new Random();
    public event EventHandler<EventArg<TValue>> Pub;
    public void Emit() {
        DateTime now = DateTime.Now;
        double randomValue = random.NextDouble() * 100; // Generates a random number between 0 and 100
        TValue value = new TValue(now, randomValue);

        EventArg<TValue> eventArg = new EventArg<TValue>(value, true, true);
        OnValuePub(eventArg);
    }
    protected virtual void OnValuePub(EventArg<TValue> eventArg) {
        Pub?.Invoke(this, eventArg);
    }
}

public class BarEmitter
{
    private Random random = new Random();
    public event EventHandler<EventArg<TBar>> Pub;
    private double lastClose = 100.0; // Starting price

    public void Emit()
    {
        double open = lastClose;
        double close = open * (1 + (random.NextDouble() - 0.5) * 0.02); // +/- 1% change
        double high = Math.Max(open, close) * (1 + random.NextDouble() * 0.005); // Up to 0.5% higher
        double low = Math.Min(open, close) * (1 - random.NextDouble() * 0.005); // Up to 0.5% lower
        double volume = random.NextDouble() * 1000000; // Random volume between 0 and 1,000,000

        TBar bar = new TBar(DateTime.Now, open, high, low, close, volume);
        lastClose = close;

        EventArg<TBar> eventArg = new EventArg<TBar>(bar, true, true);
        OnBarPub(eventArg);
    }

    protected virtual void OnBarPub(EventArg<TBar> eventArg)
    {
        Pub?.Invoke(this, eventArg);
    }
}


public class Listener
{
    public void Sub(object sender, EventArgs e)
    {
        if (e is EventArg<TValue> tValueArg) {
            Console.WriteLine($"TValue: {tValueArg.Data.Value:F2}");
        } else if (e is EventArg<TBar> tBarArg) {
            Console.WriteLine($"TBar: o={tBarArg.Data.Open:F2}, v={tBarArg.Data.Volume:F2}");
        } else {
            Console.WriteLine($"Unknown type: {e.GetType().Name}");
        }
    }
}

#!csharp

Emitter em1 = new();
BarEmitter em2 = new();
Listener list = new();

em1.Pub += list.Sub;
em2.Pub += list.Sub;

// Emit 5 random values
for (int i = 0; i < 3; i++) {
    em1.Emit();
    em2.Emit();
}

#!csharp

public abstract class Indicator {
    protected Indicator() {
        Init(); }
    public virtual void Init() {}
    public virtual TValue Calc(TValue input, bool isNew=true, bool isHot=true) {
        return new TValue();
    }
}

public class EMA : Indicator
{
    private double lastEma, lastEmaCandidate, k;
    private int period, i;

    public EMA(int period) {
        Init(period);
    }

   public void Init(int period)
    {
        this.period = period;
        this.k = 2.0 / (period + 1);
        this.lastEma = this.lastEmaCandidate = double.NaN;
        this.i = 0;
    }

    public override TValue Calc(TValue input, bool isNew = true, bool isHot = true) {
        double ema;

        if (double.IsNaN(lastEma)) { lastEma = lastEmaCandidate = input.Value; }

        if (isNew) {
            lastEma = lastEmaCandidate;
            i++;
        }

        double kk = (i>=period)?k:(2.0/(i+1));
        ema = lastEma + kk * (input.Value - lastEma);
        lastEmaCandidate = ema;

        return new TValue(input.Timestamp, ema);
    }
}

#!csharp

EMA ema = new(3);
display(ema.Calc(100));
display(ema.Calc(0,false));
display(ema.Calc(100,false));
display(ema.Calc(0));