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

public class DragDropItem : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public int itemID;
    public float snapDistance = 100f;

    private RectTransform rectTransform;
    private CanvasGroup canvasGroup;

    private Transform originalCardBackground;
    private Vector3 startWorldPos;

    private DragDropManager manager;
    private bool isLocked = false;

    public void Setup(Sprite sp, int id, DragDropManager mgr)
    {
        rectTransform = GetComponent<RectTransform>();
        canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null) canvasGroup = gameObject.AddComponent<CanvasGroup>();

        GetComponent<Image>().sprite = sp;
        itemID = id;
        manager = mgr;
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        if (isLocked) return;

        originalCardBackground = transform.parent;
        startWorldPos = transform.position;

        transform.SetParent(transform.root);
        transform.SetAsLastSibling();

        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0.8f;
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (isLocked) return;
        transform.position = eventData.position;
    }

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

        ShadowSlot[] slots = FindObjectsOfType<ShadowSlot>();
        ShadowSlot closest = null;
        float minDist = snapDistance;

        foreach (ShadowSlot s in slots)
        {
            float d = Vector2.Distance(transform.position, s.transform.position);
            if (d < minDist && s.slotID == itemID && !s.isOccupied)
            {
                minDist = d;
                closest = s;
            }
        }

        if (closest != null) StartCoroutine(CorrectAnim(closest));
        else StartCoroutine(WrongAnim());
    }

    // --- FITUR BARU: ANIMASI KETIKA BENAR ---
    IEnumerator CorrectAnim(ShadowSlot s)
    {
        isLocked = true;
        transform.position = s.transform.position;

        // Animasi "Pulse" (Membesar sedikit lalu pas)
        float t = 0;
        while (t < 1)
        {
            t += Time.deltaTime * 8;
            transform.localScale = Vector3.Lerp(Vector3.one, new Vector3(1.2f, 1.2f, 1.2f), t);
            yield return null;
        }

        s.CompleteSlot();
        manager.CheckWin();
        Destroy(gameObject);
    }

    // --- FITUR BARU: ANIMASI SALAH + HUKUMAN ---
    IEnumerator WrongAnim()
    {
        isLocked = true;

        // Panggil Hukuman Waktu dari Manager!
        manager.BerikanHukumanWaktu();

        // Animasi "Shake" (Bergetar Kiri-Kanan tanda salah)
        Vector3 curPos = transform.position;
        for (int i = 0; i < 4; i++)
        {
            transform.position = curPos + new Vector3((i % 2 == 0 ? 15f : -15f), 0, 0);
            yield return new WaitForSeconds(0.04f);
        }
        transform.position = curPos; // Kembalikan ke titik asalnya sebelum terbang balik

        // Meluncur balik ke bingkai aslinya
        float time = 0;
        while (time < 1)
        {
            time += Time.deltaTime * 8;
            transform.position = Vector3.Lerp(curPos, startWorldPos, time);
            yield return null;
        }

        transform.SetParent(originalCardBackground);
        rectTransform.anchoredPosition = Vector2.zero;
        isLocked = false;
    }
}