using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;

namespace Stary.Evo.UIFarme
{
    /// <summary>
    /// 基于Resources的资源加载实现
    /// </summary>
    public class ResourcesAssetLoader : IAssetLoader
    {
        private readonly Dictionary<string, Object> _assetCache = new Dictionary<string, Object>();

        /// <summary>
        /// 通过Resources异步加载GameObject资源
        /// </summary>
        public async Task<GameObject> LoadGameObjectAsync(string assetPath, string packageName = null)
        {
            // Resources模式下忽略packageName
            var request = Resources.LoadAsync<GameObject>(assetPath);
            while (!request.isDone)
            {
                await Task.Yield();
            }

            var asset = request.asset as GameObject;
            if (asset != null)
            {
                _assetCache[assetPath] = asset;
            }

            return asset;
        }

        /// <summary>
        /// 释放Resources加载的资源
        /// </summary>
        public void UnloadAsset(string assetPath)
        {
            if (_assetCache.TryGetValue(assetPath, out Object asset) && asset != null)
            {
                Resources.UnloadAsset(asset);
                _assetCache.Remove(assetPath);
            }
        }
    }
}