using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Foresight.Engine
{
    public class FrameCounter
    {
        private double _currFrameTime;
        private readonly double _weight;
        private readonly int _numerator;

        public FrameCounter(int frameWeight)
        {
            _numerator = frameWeight;
            _weight = frameWeight / (frameWeight - 1d);
        }

        public long TotalFrames { get; private set; }
        public float TotalSeconds { get; private set; }
        public float AverageFramesPerSecond { get; private set; }
        public float CurrentFramesPerSecond { get; private set; }

        public const int MaximumSamples = 100;

        private readonly Queue<float> _sampleBuffer = new Queue<float>();

        public bool Update(float deltaTime)
        {
            CurrentFramesPerSecond = 1.0f / deltaTime;

            _sampleBuffer.Enqueue(CurrentFramesPerSecond);

            if (_sampleBuffer.Count > MaximumSamples)
            {
                _sampleBuffer.Dequeue();
                AverageFramesPerSecond = _sampleBuffer.Average(i => i);
            }
            else
            {
                AverageFramesPerSecond = CurrentFramesPerSecond;
            }

            TotalFrames++;
            TotalSeconds += deltaTime;
            return true;
        }

        public void Draw(SpriteBatch spriteBatch, Vector2 pos, Color? color = null)
        {

        } 
    }
}