using System;
using UnityEngine;
using UnityEngine.EventSystems;

public class DraggableCard : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
{
    private Vector3 originalPosition;
    private Vector3 originalScale;
    private CanvasGroup canvasGroup;

    private void Start()
    {
        canvasGroup = GetComponent<CanvasGroup>();
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        var transform1 = transform;
        originalPosition = transform1.position;
        originalScale = transform1.localScale;
        canvasGroup.alpha = 0.5f;
        transform1.localScale = new Vector3(0.3f, 0.3f, 1f);
    }

    public void OnDrag(PointerEventData eventData)
    {
        transform.position = Input.mousePosition;
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit) && hit.collider.CompareTag("Ground")) 
        {
            // 마우스가 Ground 위에 있을 때
            
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        // 지형에 올바르게 드롭되지 않으면
        if (!IsDroppedOnTarget())
        {
            var transform1 = transform;
            transform1.position = originalPosition;
            transform1.localScale = originalScale;
            canvasGroup.alpha = 1;
        }
    }

    private bool IsDroppedOnTarget()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
        
            if (Physics.Raycast(ray, out hit))
            {
                if (hit.collider.CompareTag("Ground"))
                {
                    Destroy(gameObject);
                    return true;
                }
            }
            return false;
    }
}