using System.Collections;
using System.Collections.Generic;
using UnityEngine;

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

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

        public override IEnumerator LoadScript(string script)
        {
            yield return base.LoadScript(script);
            foreach (var loading in AssetBundleLoadings)
            {
                yield return loading;
            }
        }

        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>
        [ScriptableCall(@"
<summary>
加载预制体作为子物体
</summary>
<param name=""ab""></param>
<param name=""prefab""></param>
")]
        public void Load(string ab, string prefab)
        {
            IEnumerator Foo()
            {
                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);
                }
            }

            AssetBundleLoadings.Add(Foo());
        }
    }
}