using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using BITKit.UX;
using Newtonsoft.Json;
using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
using UnityEngine;
using UnityEngine.UIElements;


namespace BITKit.IData
{
	public class UXDataBindingService : MonoBehaviour
	{
		[RuntimeInitializeOnLoadMethod]
		private static void Reload()
		{
			_Binders.Clear();
			_Instances.Clear();
		}
		private static readonly Dictionary<Type,IUXDataBinder> _Binders = new();
		private static readonly CacheList<IUXDataBinder> _Instances = new();
		
		public static IUXDataBinder Create(object target,FieldInfo fieldInfo)
		{
			var value = fieldInfo.GetValue(target);
			var type = value?.GetType() ?? fieldInfo.FieldType;

			// if (value is IEnumerable)
			// {
			// 	//type = typeof(IEnumerable<>).MakeGenericType(fieldInfo.FieldType.GetElementType());
			// 	//type = typeof(IEnumerable<>).MakeGenericType(type.GetGenericArguments());
			// }

			switch (value)
			{
				case Array:
					type = typeof(IEnumerable<>).MakeGenericType(fieldInfo.FieldType.GetElementType());
					break;
				case IList:
					type = typeof(IEnumerable<>).MakeGenericType(type.GetGenericArguments());
					break;
			}
			
			if (_Binders.TryGetValue(type, out var binder) is false)
				throw new NotImplementedException($"未支持的类型:{type.Name}");
			
			var instance = (IUXDataBinder)Activator.CreateInstance(binder.GetType());
			_Instances.Add(instance);
			
			return instance;
		}
		
		[SerializeReference, SubclassSelector] private ITicker ticker;

		private async void Start()
		{
			var binders = await ReflectionHelper.GetTypes<IUXDataBinder>();
			if(destroyCancellationToken.IsCancellationRequested)return;

			foreach (var x in binders)
			{
				var instance = (IUXDataBinder)Activator.CreateInstance(x);
				if (_Binders.TryAdd(instance.TargetType, instance)) ;
			}

			ticker.Add(OnTick);
			
			destroyCancellationToken.Register(() =>
			{
				ticker.Remove(OnTick);
			});
		}
		private static void OnTick(float obj)
		{
			var array = _Instances.ValueArray;
			foreach (var x in array)
			{
				if (x.VisualElement.panel is null)
				{
					_Instances.Remove(x);
					continue;
				}
				x.OnTick(obj);
			}
		}
	}
}