using System;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;

namespace AibisDream.Framework
{
    /// <summary>
    /// 旧版资源加载工具类。新代码请使用 ResourceSystem / SceneResourceLoader。
    /// 保留供过渡期使用，后续迁移完成后将移除。
    /// </summary>
    public static class ResourceKit
    {
        public static T LoadAssetSync<T>(string key) where T : UnityEngine.Object
        {
            var operation = Addressables.LoadAssetAsync<T>(key);

            operation.WaitForCompletion();

            if (operation.Status == AsyncOperationStatus.Succeeded)
            {
                return operation.Result;
            }
            else
            {
                Debug.Log($"资源{key}不存在");
                return default;
            }
        }

        public static void LoadAssetAsync<T>(string key, Action<T> callback) where T : UnityEngine.Object
        {
            Addressables.LoadAssetAsync<T>(key).Completed += operation =>
            {
                if (operation.Status == AsyncOperationStatus.Succeeded)
                {
                    callback(operation.Result);
                }
                else
                {
                    Debug.Log($"资源{key}不存在");
                }
            };
        }

        /// <summary>
        /// 异步加载 Addressable 资源，callback 接收完整 handle。调用方需在适当时机调用 Release 释放。
        /// </summary>
        public static void LoadAssetAsyncWithHandle<T>(string key, Action<AsyncOperationHandle<T>> callback) where T : UnityEngine.Object
        {
            var handle = Addressables.LoadAssetAsync<T>(key);
            handle.Completed += operation =>
            {
                if (operation.Status != AsyncOperationStatus.Succeeded)
                {
                    Debug.Log($"资源{key}不存在");
                }
                callback(operation);
            };
        }

        /// <summary>
        /// 释放 Addressable 加载的 handle
        /// </summary>
        public static void Release<T>(AsyncOperationHandle<T> handle)
        {
            if (handle.IsValid())
                Addressables.Release(handle);
        }
    }
}