using UnityEngine;
using UnityEngine.EventSystems;

public class PotonganPuzzleUI : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public string idPotongan; // Isi di Inspector: P1, P2, dst
    private RectTransform rectTransform;
    private CanvasGroup canvasGroup;
    private Vector3 posisiAwal;
    private Canvas canvas;

    void Awake() {
        rectTransform = GetComponent<RectTransform>();
        canvasGroup = GetComponent<CanvasGroup>();
        canvas = GetComponentInParent<Canvas>();
        // Simpan posisi awal di area acak biar bisa balik kalau salah
        posisiAwal = rectTransform.anchoredPosition;
    }

    public void OnBeginDrag(PointerEventData eventData) {
        canvasGroup.alpha = 0.7f; // Efek agak transparan pas ditarik
        canvasGroup.blocksRaycasts = false; // Tembus biar bisa deteksi Wadah di bawahnya
    }

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

    public void OnEndDrag(PointerEventData eventData) {
        canvasGroup.alpha = 1f;
        canvasGroup.blocksRaycasts = true;

        // Kalau dilepas tapi tidak nempel (parent-nya masih TempatAcak), balik ke posisi semula
        if (transform.parent.name == "TempatAcak") {
            rectTransform.anchoredPosition = posisiAwal;
        }
    }
}