using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using TMPro;


public class DraggableCard : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public string layerName;

    private RectTransform rectTransform;
    private CanvasGroup canvasGroup;
    private Vector2 startPosition;
    private Transform startParent;
    private Canvas canvas;

    void Awake()
    {
        rectTransform = GetComponent<RectTransform>();
        canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null)
            canvasGroup = gameObject.AddComponent<CanvasGroup>();
        canvas = GetComponentInParent<Canvas>();
    }

    void Start()
    {
        startPosition = rectTransform.anchoredPosition;
        startParent = transform.parent;
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        if (transform.parent != startParent)
        {
            DropZone currentZone = transform.parent.GetComponent<DropZone>();
            if (currentZone != null)
                currentZone.currentCard = null;
        }

        transform.SetParent(canvas.transform);
        transform.SetAsLastSibling();
        canvasGroup.blocksRaycasts = false;
    }

    public void OnDrag(PointerEventData eventData)
    {
        rectTransform.anchoredPosition += eventData.delta / canvas.scaleFactor;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        canvasGroup.blocksRaycasts = true;
        if (transform.parent == canvas.transform)
            ReturnToOriginal();
    }

    public void ReturnToOriginal()
    {
        transform.SetParent(startParent);
        rectTransform.anchoredPosition = startPosition;
    }
}