using System.Collections.Generic;
using UnityEngine;
[RequireComponent(typeof(BoxCollider2D))]
public sealed class Sensor2DProbe : MonoBehaviour
{
    [SerializeField] private LayerMask actorLayers = ~0;
    private readonly HashSet<int> countedActors = new HashSet<int>();
    private void OnTriggerEnter2D(Collider2D other)
    {
        if (!isActiveAndEnabled) return;
        if ((actorLayers.value & (1 << other.gameObject.layer)) == 0) return;
        Rigidbody2D body = other.attachedRigidbody;
        GameObject actor = body != null ? body.gameObject : other.gameObject;
        if (countedActors.Add(actor.GetInstanceID()))
            Debug.Log("Unique 2D actors: " + countedActors.Count, this);
    }
}