using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.UX
{
	public class UXBindPathAttribute : Attribute
	{
		public string Path;
		public UXBindPathAttribute(){}
		public UXBindPathAttribute(string path)
		{
			Path = path;
		}
	}
	public  class UXUtils
	{
		public static void Inject(object self)
		{
			var field = self.GetType().GetField("document",
				BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
			if (field is null)
			{
				BIT4Log.Warning<UXUtils>($"{self.GetType().Name} not find {nameof(UIDocument)}");
				return;
			}
			if (field.GetValue(self) is not UIDocument document)
			{
				if (self is MonoBehaviour monoBehaviour && (document = monoBehaviour.GetComponentInParent<UIDocument>()))
				{
					field.SetValue(self,document);
				}
				else
				{
					BIT4Log.Warning<UXUtils>($"document 未赋值");
					return;
				}
			}
			foreach (var fieldInfo in self.GetType()
				         .GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
				         .Where(x=>x.GetCustomAttribute<UXBindPathAttribute>() is not null)
			         )
			{
				var bindPathAtt = fieldInfo.GetCustomAttribute<UXBindPathAttribute>();
				var ve = document.rootVisualElement.Q(bindPathAtt.Path);
				fieldInfo.SetValue(self,ve);
			}
		}
	}
}