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

namespace BITKit.UX.DataBind
{
	public abstract class UXDataBind<TData, TVisualElement> : MonoBehaviour where TVisualElement : VisualElement, new()
	{
		[SerializeReference, SubclassSelector] protected IReference dataName;
		[SerializeReference, SubclassSelector] protected IReference visualElementName;
		[SerializeField] protected UIDocument document;
		protected TVisualElement visualElement { get; private set; }

		protected virtual void Start()
		{
			visualElement = document.rootVisualElement.Q<TVisualElement>(visualElementName.Value);
			if (visualElement is INotifyValueChanged<TData> notifyValueChanged)
				notifyValueChanged.RegisterValueChangedCallback(OnValueChanged);
			Data.AddListener<TData>(dataName.Value, OnData);
			destroyCancellationToken.Register(() => { Data.RemoveListender<TData>(dataName.Value, OnData); });
		}
		private void OnData(TData obj)
		{
			if (visualElement is INotifyValueChanged<TData> notifyValueChanged)
				notifyValueChanged.SetValueWithoutNotify(obj);
		}
		private void OnValueChanged(ChangeEvent<TData> changeEvent)
		{
			Data.Set<TData>(dataName.Value, changeEvent.newValue);
		}
	}
}