using Convention;
using Demo.Game.Attr;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;

namespace Demo.Game
{
    namespace ConfigType
    {
        public class PrefabRootObjectConfig : ScriptLoadableConfig
        {
            private readonly Dictionary<string, List<string>> LoadedGameObjectNames = new();

            public override void Deserialize(BinaryReader reader)
            {
                base.Deserialize(reader);
            }

            public override void Serialize(BinaryWriter writer)
            {
                base.Serialize(writer);
            }
        }
    }

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

        private int LoadingCounter = 0;
        private readonly Dictionary<string, List<string>> LoadedGameObjectNames = new();
        private readonly List<GameObject> LoadedGameObjects = new();

        protected override IEnumerator DoSomethingDuringApplyScript()
        {
            yield return base.DoSomethingDuringApplyScript();
            yield return new WaitUntil(() => LoadingCounter == 0);
        }

        public override IEnumerator UnloadScript()
        {
            yield return base.UnloadScript();
            foreach (var obj in LoadedGameObjects)
            {
                Destroy(obj);
            }
            foreach (var item in LoadedGameObjectNames)
            {
                yield return this.UnloadAssetBundle(item.Key);
            }
        }

        /// <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 void Load(string ab, string prefab)
        {
            LoadingCounter++;
            ConventionUtility.StartCoroutine(this.LoadAssetBundle(ab, assetBundle =>
            {
                GameObject prefabObject = null;
                if (assetBundle != null)
                {
                    prefabObject = Instantiate(assetBundle.LoadAsset<GameObject>(prefab));
                    LoadedGameObjects.Add(prefabObject);
                    prefabObject.transform.SetParent(transform);
                    if (LoadedGameObjectNames.ContainsKey(ab) == false)
                        LoadedGameObjectNames.Add(ab, new());
                    LoadedGameObjectNames[ab].Add(prefab);
                }
                else
                {
                    Debug.LogError($"Load AssetBundle failed", this);
                }
                LoadingCounter--;
            }));
        }
    }
}