using System;
using System.Collections;
using UnityEngine;

namespace OCES
{
    public class AssetBundleAssetProvider : IAssetProvider
    {
        readonly AssetBundle m_assetBundle;

        public AssetBundleAssetProvider(string bundleFilePath)
        {
            this.m_assetBundle = AssetBundle.LoadFromFile(bundleFilePath);
            if (this.m_assetBundle is null)
            {
                Debug.LogError($"[OCES] 无法加载: {bundleFilePath}");
            }
        }
        
        public T Load<T>(string path) where T : UnityEngine.Object
        {
            return this.m_assetBundle.LoadAsset<T>(path);
        }

        public void LoadAsync<T>(string path, MonoBehaviour coroutineHost, Action<T> onComplete) where T : UnityEngine.Object
        {
            coroutineHost.StartCoroutine(LoadAsyncCoroutine(path, onComplete));
        }

        IEnumerator LoadAsyncCoroutine<T>(string path, Action<T> onComplete) where T : UnityEngine.Object
        {
            AssetBundleRequest request = this.m_assetBundle.LoadAssetAsync<T>(path);
            yield return request;
            onComplete?.Invoke(request.asset as T);
        }
    }
}