using System;
using System.Collections.Generic;
using AlicizaX.Runtime;
using UnityEngine;
using Object = UnityEngine.Object;

namespace AlicizaX.Resource.Runtime
{
    [Serializable]
    public struct AssetsRefInfo
    {
        public int instanceId;

        public Object refAsset;

        public AssetsRefInfo(Object refAsset)
        {
            this.refAsset = refAsset;
            instanceId = this.refAsset.GetInstanceID();
        }
    }

    public sealed class AssetsReference : MonoBehaviour
    {
        [SerializeField] private GameObject _sourceGameObject;

        [SerializeField] private List<AssetsRefInfo> _refAssetInfoList;

        private ResourceComponent _resourceComponent;

        private void OnDestroy()
        {
            if (_resourceComponent == null)
            {
                _resourceComponent = GameEntry.GetComponent<ResourceComponent>();
            }

            if (_resourceComponent == null)
            {
                throw new GameFrameworkException($"ResourceManager is null.");
            }

            if (_sourceGameObject != null)
            {
                _resourceComponent.UnloadAsset(_sourceGameObject);
            }

            ReleaseRefAssetInfoList();
        }

        private void ReleaseRefAssetInfoList()
        {
            if (_refAssetInfoList != null)
            {
                foreach (var refInfo in _refAssetInfoList)
                {
                    _resourceComponent.UnloadAsset(refInfo.refAsset);
                }

                _refAssetInfoList.Clear();
            }
        }

        public AssetsReference Ref(GameObject source)
        {
            if (source == null)
            {
                throw new GameFrameworkException($"Source gameObject is null.");
            }

            if (source.scene.name != null)
            {
                throw new GameFrameworkException($"Source gameObject is in scene.");
            }

            _sourceGameObject = source;
            return this;
        }

        public AssetsReference Ref<T>(T source) where T : UnityEngine.Object
        {
            if (source == null)
            {
                throw new GameFrameworkException($"Source gameObject is null.");
            }

            if (_refAssetInfoList == null)
            {
                _refAssetInfoList = new List<AssetsRefInfo>();
            }

            _refAssetInfoList.Add(new AssetsRefInfo(source));
            return this;
        }

        public static AssetsReference Instantiate(GameObject source, Transform parent = null)
        {
            if (source == null)
            {
                throw new GameFrameworkException($"Source gameObject is null.");
            }

            if (source.scene.name != null)
            {
                throw new GameFrameworkException($"Source gameObject is in scene.");
            }

            GameObject instance = Object.Instantiate(source, parent);
            return instance.AddComponent<AssetsReference>().Ref(source);
        }

        public static AssetsReference Ref(GameObject source, GameObject instance)
        {
            if (source == null)
            {
                throw new GameFrameworkException($"Source gameObject is null.");
            }

            if (source.scene.name != null)
            {
                throw new GameFrameworkException($"Source gameObject is in scene.");
            }

            return instance.GetOrAddComponent<AssetsReference>().Ref(source);
        }

        public static AssetsReference Ref<T>(T source, GameObject instance) where T : UnityEngine.Object
        {
            if (source == null)
            {
                throw new GameFrameworkException($"Source gameObject is null.");
            }

            return instance.GetOrAddComponent<AssetsReference>().Ref(source);
        }
    }
}