using System.Collections;
using System.Collections.Generic;

namespace BitStrap
{
	public class CircularBuffer<T> : IEnumerable<T>, IEnumerable
	{
		private T[] elements;

		private int tail;

		public int Count { get; private set; }

		public T Current
		{
			get
			{
				return elements[tail];
			}
		}

		public T this[int index]
		{
			get
			{
				return elements[(tail + index) % Count];
			}
			set
			{
				elements[(tail + index) % Count] = value;
			}
		}

		public CircularBuffer(int capacity)
		{
			elements = new T[capacity];
			Count = 0;
			tail = 0;
		}

		public void Add(T element)
		{
			elements[tail] = element;
			int num = elements.Length;
			Count = ((Count >= num) ? num : (Count + 1));
			tail = (tail + 1) % num;
		}

		public void Clear()
		{
			Count = 0;
			tail = 0;
		}

		public IEnumerator<T> GetEnumerator()
		{
			int count = Count;
			for (int i = 0; i < count; i++)
			{
				yield return this[i];
			}
		}

		IEnumerator IEnumerable.GetEnumerator()
		{
			int count = Count;
			for (int i = 0; i < count; i++)
			{
				yield return this[i];
			}
		}
	}
}