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

using UnityEngine;

namespace ET
{
	
	public class AssetBundlePoolAwakeSystem : AwakeSystem<AssetBundlePool, string>
	{
		public override void Awake(AssetBundlePool self,string name)
		{
			self.Awake(name);
		}
	}


	
	public class AssetBundlePoolDestroySystem : DestroySystem<AssetBundlePool>
	{
		public override void Destroy(AssetBundlePool self)
		{
			self.Destroy();
		}
	}
	
	public class AssetBundlePool : Entity
	{    
#if UNITY_EDITOR
        public Dictionary<string, ResourceEntity> InspectorDic = new Dictionary<string, ResourceEntity>();
#endif

		public string PoolName { get; private set; }


		/// <summary>
		/// 资源池字典
		/// </summary>
		private Dictionary<string, ResourceEntity> m_ResourceDic;
		/// <summary>
		/// 需要移除的Key链表
		/// </summary>
		private LinkedList<string> m_NeedRemoveKeyList;


		public void Awake(string poolName)
		{
			PoolName = poolName;

			m_ResourceDic = new Dictionary<string, ResourceEntity>();
			m_NeedRemoveKeyList = new LinkedList<string>();
		}
        public void Regist(ResourceEntity entity)
        {
            entity.Spawn();
#if UNITY_EDITOR
            InspectorDic[entity.ResourceName] = entity;
#endif
            m_ResourceDic[entity.ResourceName] = entity;
        }
        /// <summary>
        /// 资源取池
        /// </summary>
        /// <param name="resourceName"></param>
        /// <returns></returns>
        public ResourceEntity Spawn(string resourceName)
        {
            if (m_ResourceDic.TryGetValue(resourceName, out ResourceEntity resourceEntity))
            {
                resourceEntity.Spawn();
#if UNITY_EDITOR
                if (InspectorDic.ContainsKey(resourceEntity.ResourceName))
                {
                    InspectorDic[resourceEntity.ResourceName] = resourceEntity;
                }
#endif
            }
            return resourceEntity;
        }
        /// <summary>
        /// 资源回池
        /// </summary>
        public void Despawn(string resourceName)
        {
            if (m_ResourceDic.TryGetValue(resourceName, out ResourceEntity resourceEntity))
            {
                resourceEntity.Despawn();
#if UNITY_EDITOR
                if (InspectorDic.ContainsKey(resourceEntity.ResourceName))
                {
                    InspectorDic[resourceEntity.ResourceName] = resourceEntity;
                }
#endif
            }
        }
        /// <summary>
        /// 释放可释放的资源
        /// </summary>
        public void Release()
        {
            Dictionary<string, ResourceEntity>.Enumerator enumerator = m_ResourceDic.GetEnumerator();
            while (enumerator.MoveNext())
            {
                ResourceEntity entity = enumerator.Current.Value;
//                if (entity.CanRelease)
//                {
//#if UNITY_EDITOR
//                    if (InspectorDic.ContainsKey(entity.ResourceName))
//                        InspectorDic.Remove(entity.ResourceName);
//#endif
//                    m_NeedRemoveKeyList.AddFirst(entity.ResourceName);
//                    entity.Release();
//                }
            }
            //删除
            var curr = m_NeedRemoveKeyList.First;
            while (curr != null)
            {
                string key = curr.Value;
                m_ResourceDic.Remove(key);

                var next = curr.Next;
                m_NeedRemoveKeyList.Remove(curr);
                curr = next;
            }
        }
        public void Release(ResourceEntity resourceEntity)
        {
            if (m_ResourceDic.TryGetValue(resourceEntity.ResourceName, out ResourceEntity resource))
            {
#if UNITY_EDITOR
                if (InspectorDic.ContainsKey(resourceEntity.ResourceName))
                    InspectorDic.Remove(resourceEntity.ResourceName);
#endif
                m_ResourceDic.Remove(resource.ResourceName);
                resource.Release();
            }
        }
        /// <summary>
        /// 强制释放所有资源
        /// </summary>
        public void ReleaseAll()
        {
            Dictionary<string, ResourceEntity>.Enumerator enumerator = m_ResourceDic.GetEnumerator();
            while (enumerator.MoveNext())
            {
                ResourceEntity entity = enumerator.Current.Value;
#if UNITY_EDITOR
                if (InspectorDic.ContainsKey(entity.ResourceName))
                    InspectorDic.Remove(entity.ResourceName);
#endif
                m_NeedRemoveKeyList.AddFirst(entity.ResourceName);
                entity.Release();
            }
            //删除
            var curr = m_NeedRemoveKeyList.First;
            while (curr != null)
            {
                string key = curr.Value;
                m_ResourceDic.Remove(key);

                var next = curr.Next;
                m_NeedRemoveKeyList.Remove(curr);
                curr = next;
            }
        }

		public void Destroy()
		{
            m_ResourceDic.Clear();
            m_ResourceDic = null;
            m_NeedRemoveKeyList.Clear();
        }
	}
}