using System;
using UnityEngine;
using UnityEngine.EventSystems;

// 为避免潜在的冲突和更清晰的逻辑，建议将类名稍作更改，以反映其新功能
// 例如：UIMouseBlocker，或者就保持 UIBlockCameraDrag 也可以，只要功能上能理解
public class UIBlockCameraDrag : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IPointerDownHandler, IPointerUpHandler
{
    public static bool IsPointerOnUI = false;
    public static bool ShouldBlockDrag = false;
    public static bool MoveEvent = false;
    public static bool DownUpEvent = false;
    public static Vector3 DragOrigin;
    public static Vector3 MoveVector;

    //是否ban点击
    public bool BanClick = false;
    
    public void OnPointerEnter(PointerEventData eventData)
    {
        IsPointerOnUI = true;
    }
    
    public void OnPointerExit(PointerEventData eventData)
    {
        IsPointerOnUI = false;
        ShouldBlockDrag = false;
        MoveEvent = false;
    }
    
    public void OnPointerDown(PointerEventData eventData)
    {
        if (IsPointerOnUI && eventData.button == PointerEventData.InputButton.Left)
        {
            ShouldBlockDrag = true;
            DragOrigin = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        if (IsPointerOnUI && eventData.button == PointerEventData.InputButton.Left)
        {
            if (!MoveEvent && !BanClick) DownUpEvent = true;
            ShouldBlockDrag = false;
            MoveEvent = false; 
        }
    }
    
    public void Update()
    {
        if (ShouldBlockDrag)
        {
            MoveVector = DragOrigin - Camera.main.ScreenToWorldPoint(Input.mousePosition);
            if (MoveVector.magnitude > 0.01f)
            {
                MoveEvent = true;
            }
        }
    }
}