using System.Collections.Generic;

namespace AibisDream.Kit
{
    public static class ListPool<T>
    {
        /// <summary>
        /// 栈对象：存储多个List
        /// </summary>
        static readonly Stack<List<T>> ListStack = new(8);

        /// <summary>
        /// 出栈：获取某个List对象
        /// </summary>
        /// <returns></returns>
        public static List<T> Get()
        {
            return ListStack.Count == 0 ? new List<T>(8) : ListStack.Pop();
        }

        /// <summary>
        /// 入栈：将List对象添加到栈中
        /// </summary>
        /// <param name="toRelease"></param>
        public static void Release(List<T> toRelease)
        {
            if (ListStack.Contains(toRelease))
            {
                throw new System.InvalidOperationException(
                    "重复回收 List，The List is released even though it is in the pool");
            }

            toRelease.Clear();
            ListStack.Push(toRelease);
        }
    }

    public static class ListPoolExtensions
    {
        public static void Release2Pool<T>(this List<T> self)
        {
            ListPool<T>.Release(self);
        }
    }
}