using Demo.Attr;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Demo.Game
{
    [Scriptable]
    public class PrefabRootObject : ScriptableObject, IAssetBundleLoader
    {
        public static PrefabRootObject Make()
        {
            return new GameObject().AddComponent<PrefabRootObject>();
        }

        private readonly List<string> AssetBundles = new();
        private readonly List<GameObject> Prefabs = new();

        public override IEnumerator UnloadScript()
        {
            yield return base.UnloadScript();
            foreach (var ab in AssetBundles)
            {
                yield return this.UnloadAssetBundle(ab);
            }
        }

        /// <summary>
        /// 加载预制体作为子物体
        /// </summary>
        /// <param name="ab"></param>
        /// <param name="prefab"></param>
        [Convention.RScript.Variable.Attr.Method]
        public IEnumerator Load(string ab, string prefab)
        {
            AssetBundle assetBundle = null;
            yield return this.LoadAssetBundle(ab, x => assetBundle = x);
            GameObject prefabObject = null;
            if (assetBundle != null)
            {
                var ir = assetBundle.LoadAssetAsync<GameObject>(prefab);
                yield return ir;
                if (ir.asset != null)
                {
                    prefabObject = Instantiate(ir.asset as GameObject);
                    Prefabs.Add(prefabObject);
                    prefabObject.transform.SetParent(transform);
                    AssetBundles.Add(ab);
                }
                else
                {
                    Debug.LogError($"Load Prefab failed", this);
                }
            }
            else
            {
                Debug.LogError($"Load AssetBundle failed", this);
            }
        }
    }
}