using System;
using UnityEngine;

public class DetectEntities : MonoBehaviour
{
	[SerializeField] private Entity thisEntity;
	private void OnTriggerEnter2D(Collider2D other)
	{
		if (!other.CompareTag(thisEntity.tag) && other.TryGetComponent(out Entity isEntity))
		{
			thisEntity.entitiesInRange.Add(isEntity);
			thisEntity.closestEntity = FindClosestEntity();
		}
	}

	private void OnTriggerExit2D(Collider2D other)
	{
		if (other.TryGetComponent(out Entity isEntity) && thisEntity.entitiesInRange.Contains(isEntity))
		{
			thisEntity.entitiesInRange.Remove(isEntity);
			if (thisEntity.closestEntity == isEntity)
			{
				thisEntity.closestEntity = FindClosestEntity();
			}
		}
	}

	private Entity FindClosestEntity()
	{
		Entity currentClosestEntity = null;
		foreach (Entity entityFound in thisEntity.entitiesInRange)
		{
			if (!currentClosestEntity ||
			    Vector3.Distance(entityFound.transform.position, thisEntity.transform.position) <
			    Vector3.Distance(currentClosestEntity.transform.position, thisEntity.transform.position))
			{
				currentClosestEntity = entityFound;
			}
		}
		return currentClosestEntity;
	}
}