using System;
using System.Collections;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.EventSystems;

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

    [InfoBox("카드가 작아지는 속도 입니다. 높을수록 천천히 작아집니다.")] [Range(0f, 1000f)]
    public float maxDistance = 500f;

    private Coroutine scaleDown;

    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);
        if (scaleDown != null) StopCoroutine(scaleDown);
        scaleDown = StartCoroutine(ScaleDown());
    }

    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())
        {
            if (scaleDown != null)
            {
                StopCoroutine(scaleDown);
                scaleDown = null;
            }

            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))
        {
            print(hit.collider.tag);
            if (hit.collider.CompareTag("Ground"))
            {
                Destroy(gameObject);
                var obj = Instantiate(DataManager.Inst.boat, GameManager.Inst.player.transform.position,
                    Quaternion.identity);
                obj.GetComponent<Boat>().target = hit.point;
                return true;
            }
        }

        return false;
    }

    private IEnumerator ScaleDown()
    {
        var originalScale = transform.localScale;
        var targetScale = new Vector3(0.3f, 0.3f, 1f);

        while (true)
        {
            // 현재 위치와 원래 위치 사이의 거리를 계산
            var distance = Vector3.Distance(originalPosition, transform.position);

            // 비율을 계산 (0 = 같은 위치, 1 = maxDistance만큼나 이상 떨어져 있음)
            var ratio = Mathf.Min(distance / maxDistance, 1f);

            // SmoothStep 사용하면, 천천히 시작해서 점차 빠르게 변화합니다.
            // float의 경우만 사용할 수 있으므로, Vector3의 모든 요소에 일일이 적용해야 합니다.
            var newScale = new Vector3(
                Mathf.SmoothStep(originalScale.x, targetScale.x, ratio),
                Mathf.SmoothStep(originalScale.y, targetScale.y, ratio),
                Mathf.SmoothStep(originalScale.z, targetScale.z, ratio)
            );

            // 조정한 스케일을 적용
            transform.localScale = newScale;

            yield return null;
        }
    }
}