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

namespace PWCommon1
{
	[Serializable]
	public class DropStack<T>
	{
		[SerializeField]
		private T[] m_items;

		[SerializeField]
		private int m_topIndex;

		[SerializeField]
		private int m_count;

		public int Capacity => m_items.Length;

		public int Count => m_count;

		public DropStack(int capacity)
		{
			m_items = new T[capacity];
			m_count = 0;
		}

		public void Push(T item)
		{
			m_items[m_topIndex] = item;
			m_topIndex = (m_topIndex + 1) % m_items.Length;
			m_count = ((Count >= m_items.Length) ? m_items.Length : (Count + 1));
		}

		public void Push(IEnumerable<T> items)
		{
			foreach (T item in items)
			{
				Push(item);
			}
		}

		public T Pop()
		{
			m_topIndex = (m_items.Length + m_topIndex - 1) % m_items.Length;
			m_count = ((Count >= 2) ? (Count - 1) : 0);
			return m_items[m_topIndex];
		}

		public T Peek()
		{
			return m_items[(m_items.Length + m_topIndex - 1) % m_items.Length];
		}
	}
}