// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

template <typename T, int32 Size = 64>
struct TFixedCircularBuffer
{
    T Buffer[Size];
    int32 BufferStartOffset = 0;
    int32 BufferLength      = 0;

    void Reset()
    {
        BufferStartOffset = 0;
        BufferLength      = 0;
    }

    void AddValue(const T Value)
    {
        Buffer[BufferStartOffset] = Value;
        BufferStartOffset++;
        if (BufferStartOffset == Size)
        {
            BufferStartOffset = 0;
        }
        if (BufferLength < Size)
        {
            BufferLength++;
        }
    }

    const T GetValue(const int32 RecentIndex) const
    {
        return Buffer[(BufferStartOffset + Size - RecentIndex - 1) % Size];
    }

    const T ComputeAverage() const
    {
        if (BufferLength == 0)
        {
            return 0;
        }
        T Total = 0;
        for (int32 RecentIndex = 0; RecentIndex < BufferLength; ++RecentIndex)
        {
            Total += Buffer[(BufferStartOffset + Size - RecentIndex - 1) % Size];
        }
        return Total / BufferLength;
    }
};