using System;
using System.Collections.Generic;

namespace XGame.Framework.Map
{
    internal class MapAssetPool
    {
        private Dictionary<Type, Stack<object>> _viewPool = new Dictionary<Type, Stack<object>>();
        /// <summary>
        /// 获取ReusableObject (需与Recycle成对)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public TEntityView Acquire<TEntityView>() where TEntityView : class, IEntityView, new()
        {
            Type type = typeof(TEntityView);
            if (_viewPool.ContainsKey(type))
            {
                var stack = _viewPool[type];
                if (stack.Count > 0)
                    return stack.Pop() as TEntityView;
            }
            return Activator.CreateInstance<TEntityView>();
        }
        ///// <summary>
        ///// 回收 (需与Acquire成对)
        ///// </summary>
        ///// <param name="obj"></param>
        //public void Recycle<TEntityView>(TEntityView obj) where TEntityView : class, IEntityView, new()
        //{
        //    Recycle(obj);
        //}
        /// <summary>
        /// 回收 (需与Acquire成对)
        /// </summary>
        /// <param name="obj"></param>
        public void Recycle(IEntityView obj)
        {
            if (obj == null) return;

            var type = obj.GetType();

            if (!_viewPool.TryGetValue(type, out var stack))
            {
                stack = new Stack<object>();
                _viewPool.Add(type, stack);
            }
            obj.Clear();
            stack.Push(obj);
        }
        public void Clear()
        {
            _viewPool.Clear();
        }
    }
}