using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using BITKit.UX;
using Newtonsoft.Json;
using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.UIElements;
using Cursor = UnityEngine.UIElements.Cursor;

namespace BITKit.IData
{
	public interface IUXDataBinder:IDisposable
	{
		Type TargetType { get; }

		void OnTick(float deltaTime);
		
		VisualElement CreateUI(object target,FieldInfo fieldInfo);
		VisualElement VisualElement { get; }
	}
	public abstract class UXDataBinder<TDataType> : IUXDataBinder
	{
		public Type TargetType => typeof(TDataType);
		public VisualElement VisualElement { get; private set; }
		protected object target{ get; private set; }
		protected TDataType currentValue { get; set; }
		protected FieldInfo fieldInfo{ get; private set; }
		protected string Name { get; private set; }

		public virtual void OnTick(float deltaTime)
		{
			var newValue = (TDataType)fieldInfo.GetValue(target);
			if(Equals(newValue,currentValue))return;
			OnValueChanged(currentValue,newValue);
		}
		protected virtual void OnValueChanged(TDataType oldValue,TDataType newValue)
		{
			currentValue = newValue;
			fieldInfo.SetValue(target,currentValue);

			if (VisualElement is INotifyValueChanged<TDataType> notifyValueChanged)
				notifyValueChanged.SetValueWithoutNotify(newValue);
		}

		public virtual void Dispose()
		{
			target = null;
			fieldInfo = null;
			VisualElement.RemoveFromHierarchy();
			VisualElement = null;
		}
		
		public VisualElement CreateUI(object target, FieldInfo fieldInfo)
		{
			this.target = target;
			this.fieldInfo = fieldInfo;
			currentValue = (TDataType)fieldInfo.GetValue(target);
			
			VisualElement = OnCreateUI();
            
			var attribute = fieldInfo.GetCustomAttribute<ExportAttribute>();
            
			if(attribute != null)
			{
				Name = attribute.Name;
				VisualElement.GetType().GetProperty("label",ReflectionHelper.Flags)?.SetValue(VisualElement, Name);
			}
			if (fieldInfo.GetCustomAttribute<ReadOnlyAttribute>() is not null)
			{
				VisualElement.SetEnabled(false);
			}
			if(VisualElement is INotifyValueChanged<TDataType> notifyValueChanged)
			{
				notifyValueChanged.SetValueWithoutNotify(currentValue);
				notifyValueChanged.RegisterValueChangedCallback(x =>
				{
					fieldInfo.SetValue(target,x.newValue);
					currentValue = x.newValue;
				});
			}

			
			return VisualElement;
		}

		
		protected abstract VisualElement OnCreateUI();
	}
	
	public sealed class UXIntBinder:UXDataBinder<int>
	{
		protected override VisualElement OnCreateUI() => new IntegerField();
	}
	public sealed class UXFloatBinder:UXDataBinder<float>
	{
		protected override VisualElement OnCreateUI() => new FloatField();
	}
	public sealed class UXVector3Binder:UXDataBinder<Vector3>
	{
		protected override VisualElement OnCreateUI() => new Vector3Field();
	}
	public sealed class UXVector2Binder:UXDataBinder<Vector2>
	{
		protected override VisualElement OnCreateUI() => new Vector2Field();
	}
	public sealed class UXStringBinder:UXDataBinder<string>
	{
		protected override VisualElement OnCreateUI()
		{
			if (this.fieldInfo.GetCustomAttribute<ReadOnlyAttribute>() is not null)
			{
				return new Label();
			}
			else
			{
				return new TextField()
				{
					isDelayed = true,
					multiline = true
				};
			}
			
		}
	}
	public sealed class UXFloat3Binder:UXDataBinder<float3>
	{
		protected override VisualElement OnCreateUI()
		{
			var field = new Vector3Field
			{
				label = Name
			};
			field.SetValueWithoutNotify(currentValue);
			field.RegisterCallback<ChangeEvent<Vector3>>(x =>
			{
				fieldInfo.SetValue(target,(float3)x.newValue);
			});
			return field;
		}
		protected override void OnValueChanged(float3 oldValue, float3 newValue)
		{
			currentValue = newValue;
			VisualElement.As<INotifyValueChanged<Vector3>>().SetValueWithoutNotify(newValue);
		}
	}
}