using System;
using UnityEngine;

[RequireComponent(typeof(SpriteRenderer))]
[RequireComponent(typeof(BoxCollider2D))]
[RequireComponent(typeof(Rigidbody2D))]
public class FollowMouseWithCollision : MonoBehaviour
{
    private SpriteRenderer spriteRenderer;
    private Color originalColor;
    private bool isColliding = false;

    void Start()
    {
        // 缓存 SpriteRenderer 和原始颜色
        spriteRenderer = GetComponent<SpriteRenderer>();
        originalColor = spriteRenderer.color;

        // 确保 Rigidbody2D 是 Kinematic
        Rigidbody2D rb = GetComponent<Rigidbody2D>();
        rb.bodyType = RigidbodyType2D.Kinematic;
    }

    void Update()
    {
        // 跟随鼠标
        Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        mousePos.z = 0;
        transform.position = mousePos;

        // 碰撞提示
        if (isColliding)
            spriteRenderer.color = Color.red; // 碰撞中变红
        else
            spriteRenderer.color = originalColor; // 恢复原色
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        Debug.Log("开始碰撞: " + other.gameObject.name);
        isColliding = true;
    }


    private void OnTriggerExit2D(Collider2D other)
    {
        Debug.Log("结束碰撞: " + other.gameObject.name);
        isColliding = false;
    }

    private void OnTriggerStay2D(Collider2D other)
    {
        isColliding = true;
    }
}