using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PetDelet : MonoBehaviour
{
    private Camera mainCamera;

    // 标记物体是否正在被拖动
    private bool isDragging = false;
    private Vector3 offset;

    private Vector3 screenPosition;

    private float initialRotationZ;
    void Start()
    {
        mainCamera = Camera.main; // 获取主相机
    }

    void Update()
    {
        // 检查萌宠是否超出屏幕
        screenPosition = mainCamera.WorldToViewportPoint(transform.position);

        // 如果宠物超出屏幕，销毁该对象
        if (screenPosition.x < 0 || screenPosition.x > 1 || screenPosition.y < 0 || screenPosition.y > 1)
        {
            Destroy(gameObject);
        }

        // 鼠标按下，开始拖动
        if (Input.GetMouseButtonDown(0))
        {
            // 发射Raycast2D，检测鼠标点击的2D物体
            Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
            RaycastHit2D hit = Physics2D.Raycast(ray.origin, ray.direction, 1000, 1 << LayerMask.NameToLayer("PetObject"));

            if (hit.collider != null && hit.collider.transform == transform)
            {
                isDragging = true; // 物体进入拖动状态
                offset = transform.position - GetMouseWorldPos(); // 计算物体和鼠标之间的偏移量
            }
        }

        // 鼠标松开，停止拖动
        if (Input.GetMouseButtonUp(0))
        {
            isDragging = false; // 物体停止拖动
        }

        // 如果物体正在被拖动，更新物体的位置
        if (isDragging)
        {
            transform.position = GetMouseWorldPos() + offset;
        }
        // 如果物体正在被拖动，更新物体的位置并保持旋转角度不变
        if (isDragging)
        {
            Vector3 newPosition = GetMouseWorldPos() + offset;
            transform.position = newPosition;
            transform.rotation = Quaternion.Euler(0, 0, initialRotationZ); // 保持物体的初始旋转角度
        }
    }

    // 获取鼠标在世界中的位置
    private Vector3 GetMouseWorldPos()
    {
        Vector3 mousePoint = Input.mousePosition; // 获取鼠标的屏幕坐标
        mousePoint.z = 0; // 因为是2D场景，不需要Z轴
        return mainCamera.ScreenToWorldPoint(mousePoint); // 转换为世界坐标
    }
}