// ***********************************************************************
// Assembly         : Unity
// Author           : KimCh
// Created          : 
//
// Last Modified By : KimCh
// Last Modified On : 
// ***********************************************************************
// <copyright file= "KDropZone" company=""></copyright>
// <summary></summary>
// ***********************************************************************
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class KDropZone : MonoBehaviour, IDropHandler, IPointerEnterHandler, IPointerExitHandler
{
	public readonly UnityEvent onDrop = new UnityEvent();

	public void OnPointerEnter(PointerEventData eventData)
	{
		if (!eventData.pointerDrag)
			return;

		var d = eventData.pointerDrag.GetComponent<KDraggable>();
		if (d != null)
		{
			d.placeHolderParent = this.transform;
		}
	}

	public void OnPointerExit(PointerEventData eventData)
	{
		if (!eventData.pointerDrag)
			return;

		var d = eventData.pointerDrag.GetComponent<KDraggable>();
		if (d != null && d.placeHolderParent == this.transform)
		{
			d.placeHolderParent = d.parentToReturnTo;
		}
	}

	public void OnDrop(PointerEventData eventData)
	{
		//Debug.Log(eventData.pointerDrag.name + " dropped on " + gameObject.name);
		if (!eventData.pointerDrag)
			return;

		var d = eventData.pointerDrag.GetComponent<KDraggable>();
		if (d != null)
		{
			d.parentToReturnTo = this.transform;
			onDrop.Invoke();
		}
	}
}