using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using BITKit.Mod;
using UnityEngine;
using YooAsset;

namespace BITKit.Animations
{
	[Serializable]
	public struct ScriptableMotionMatchingSingleton:IMotionMatchingService
	{
		public bool TryMatch(out IMotionMatchingObject value, string[] key)=>ScriptableMotionMatchingService.Singleton.TryMatch(out value,key);
	}
	public class ScriptableMotionMatchingService : MonoBehaviour,IMotionMatchingService
	{
		internal static ScriptableMotionMatchingService Singleton { get; private set; }
		internal static readonly ConcurrentDictionary<int, IMotionMatchingObject> Cache = new();
		
		private ObjectMatcher<string,IMotionMatchingObject> _objects;

		private void Awake()
		{
			Singleton = this;
		}

		private void OnEnable()
		{
			ModService.OnReloaded += Rebuild;
		}

		private void Start()
		{
			Rebuild();
		}

		private void OnDisable()
		{
			ModService.OnReloaded -= Rebuild;
		}

		public bool TryMatch(out IMotionMatchingObject value, string[] key)
		{
			value = Cache.GetOrAdd(MathE.GetHash(key),Add);
			return value is not null;
			
			IMotionMatchingObject Add(int hash)
			{
				if (_objects.TryMatch(out IMotionMatchingObject x, key) is false)
				{
					BIT4Log.Log<ScriptableMotionMatchingService>($"找不到对应的MotionMatchingObject:{string.Join(",", key)}");
					return null;
				}
				return x;
			}
		}

		private void Rebuild()
		{
			Cache.Clear();
			var list = new List<ScriptableMotionMatchingObject>();
			var tags = new []{nameof(IMotionMatchingObject)};
			foreach (var x in YooAssets.GetAssetInfos(tags))
			{
				var assetHandle =YooAssets.LoadAssetSync<ScriptableMotionMatchingObject>(x.AssetPath);
				assetHandle.WaitForAsyncComplete();
				list.Add(assetHandle.AssetObject.As<ScriptableMotionMatchingObject>());
			}
			_objects = new ObjectMatcher<string, IMotionMatchingObject>
			{
				list = list.ToArray(),
			};
		}
	}

}