// ***********************************************************************
// Assembly         : Unity
// Author           : Kimch
// Created          : 
//
// Last Modified By : Kimch
// Last Modified On : 
// ***********************************************************************
// <copyright file= "AssetProxy" company=""></copyright>
// <summary></summary>
// ***********************************************************************
#if UNITY_EDITOR
#define USE_ADDRESSABLES
//#define USE_ASSETDATABASE
#else
#endif

namespace G
{
	using System.Collections.Generic;
	using UnityEngine;
	using UnityEngine.ResourceManagement.AsyncOperations;

	partial class AssetProxy
	{
		/// <summary>
		/// 
		/// </summary>
		private readonly Dictionary<string, Dictionary<string, AsyncOperationHandle>> _autoReleasePools = new Dictionary<string, Dictionary<string, AsyncOperationHandle>>();

		/// <summary>
		/// 
		/// </summary>
		/// <param name="pool"></param>
		public void CreateReleasePool(string pool)
		{
			if (!string.IsNullOrEmpty(pool) && !_autoReleasePools.ContainsKey(pool))
			{
				var releasePool = new Dictionary<string, AsyncOperationHandle>();
				_autoReleasePools.Add(pool, releasePool);
			}
			else
			{
				Debug.LogWarning($"Auto release pool ({pool}) exist.");
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="pool"></param>
		public bool RemoveReleasePool(string pool)
		{
			if (_autoReleasePools.TryGetValue(pool, out Dictionary<string, AsyncOperationHandle> releasePool))
			{
				_autoReleasePools.Remove(pool);
				foreach (var item in releasePool)
				{
					Release(item.Value);
				}
				return true;
			}
			else
			{
				return false;
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="key"></param>
		/// <param name="value"></param>
		/// <param name="pool"></param>
		private void AddHandleToReleasePool(string key, AsyncOperationHandle value, string pool)
		{
			if (_autoReleasePools.TryGetValue(pool, out Dictionary<string, AsyncOperationHandle> releasePool))
			{
				releasePool.Add(key, value);
			}
			else
			{
				Debug.LogWarning($"Auto release pool ({pool}) not exist.");
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="key"></param>
		/// <param name="pool"></param>
		private void RemoveHandleInReleasePool(string key, string pool)
		{
			if (_autoReleasePools.TryGetValue(pool, out Dictionary<string, AsyncOperationHandle> releasePool))
			{
				releasePool.Remove(key);
			}
			else
			{
				Debug.LogWarning($"Auto release pool ({pool}) not exist.");
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="key"></param>
		/// <param name="value"></param>
		/// <param name="pool"></param>
		/// <returns></returns>
		private bool TryGetHandleInReleasePool(string key, out AsyncOperationHandle value, string pool)
		{
			if (_autoReleasePools.TryGetValue(pool, out Dictionary<string, AsyncOperationHandle> releasePool))
			{
				return releasePool.TryGetValue(key, out value);
			}
			else
			{
				Debug.LogWarning($"Auto release pool ({pool}) not exist.");
				value = default;
				return false;
			}
		}

		class PoolInstance
		{
			public int status;
			public string key;
			public AsyncOperationHandle<GameObject> handle;

			public GameObject go => handle.Result;
		}

		private void AddPoolInstance(string key, AsyncOperationHandle<GameObject> handle)
		{
			if (!_poolInstanceNodes.ContainsKey(key))
			{
				var node = _poolInstances.AddLast(new PoolInstance
				{
					handle = handle,
					status = 0,
				});
				_poolInstanceNodes.Add(key, node);
			}
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="key"></param>
		private void ReleasePoolInstance(string key)
		{
			if (_poolInstanceNodes.TryGetValue(key, out var result))
			{
				result.Value.status = Time.frameCount;
				_poolInstanceNodes.Remove(key);
			}
		}

		Dictionary<string, LinkedListNode<PoolInstance>> _poolInstanceNodes = new Dictionary<string, LinkedListNode<PoolInstance>>();
		private LinkedList<PoolInstance> _poolInstances = new LinkedList<PoolInstance>();

		private void UpdatePool()
		{

		}

		void OnLowMemoryCallback()
		{

		}
	}
}