using System.Collections;
using UnityEngine;
using UnityEngine.EventSystems;

public class Draggable : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public ActionButton parentActionButton;

    public static Draggable itemBeingDragged;
    public static Vector3 startPosition;

    void IBeginDragHandler.OnBeginDrag( PointerEventData eventData )
    {
        itemBeingDragged = this;
        startPosition = transform.position;
        transform.SetParent( DragPanel.s.transform, true );
        GetComponent<CanvasGroup>( ).blocksRaycasts = false;
    }

    void IDragHandler.OnDrag( PointerEventData eventData )
    {
        transform.position = eventData.position;
    }

    // OnDrop occurs before OnEndDrag and is handled in Droppable.cs

    void IEndDragHandler.OnEndDrag( PointerEventData eventData )
    {
        transform.SetParent( parentActionButton.transform, true );
        parentActionButton.hotkeyText.transform.SetAsLastSibling( );
        transform.position = startPosition;
        GetComponent<CanvasGroup>( ).blocksRaycasts = true;

        if ( itemBeingDragged != null && itemBeingDragged.parentActionButton.buttonType == ActionButton.ButtonType.actionBars )
        {
            parentActionButton.assignSpell( null );
        }
        else if ( itemBeingDragged != null && itemBeingDragged.parentActionButton.buttonType == ActionButton.ButtonType.inventory )
        {
            // TODO prompt to destroy item
        }
        itemBeingDragged = null;
    }
}