using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;


public enum ItemType
{
    ChuanGanQi,
    SheXiang,
    ZHLuDeng,
    LeiDa,

}

public class DragItem : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
{

    public ItemType itemType;

    [Header("鼠标按下事件")]
    public UnityEvent _Downevent;

    [Header("鼠标松开事件")]
    public UnityEvent _UpEvent;

    [Header("鼠标拖拽事件")]
    public UnityEvent _DragEvent;


    private bool canDrag = false;
    private Vector3 tempPos;
    private Vector3 resetPos;

    private void OnEnable()
    {
        resetPos = transform.localPosition;
       // _UpEvent.AddListener(CheckDragAear);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (canDrag)
        {
            _DragEvent.Invoke();
            this.transform.position = Input.mousePosition;
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        canDrag = true;
        _Downevent.Invoke();
        //DragCheck[] checks = GameObject.FindObjectsOfType<DragCheck>();
        //for (int i = 0; i < checks.Length; i++)
        //{

        //    checks[i].Show();
        //}
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        canDrag = false;
        tempPos = transform.position;
        transform.localPosition = resetPos;
        CheckDragAear();
        _UpEvent.Invoke();
      
        //DragCheck[] checks = GameObject.FindObjectsOfType<DragCheck>();
        //for (int i = 0; i < checks.Length; i++)
        //{

        //    checks[i].Hide();
        //}
    }


    private void CheckDragAear()
    {
        DragCheck[] checks = GameObject.FindObjectsOfType<DragCheck>();
        for (int i = 0; i < checks.Length; i++)
        {
           Vector3 checkPos= CameraManager.Instance.MainCamera.WorldToScreenPoint(checks[i].transform.position);
            if (Vector2.Distance(this.tempPos, checkPos) <= 60)
            {
                //放置
                checks[i].ShowItem(this.itemType);
            }

        }
    }

}