CapersProject/Assets/02.Scripts/Liquid.cs

using UnityEngine;
using UnityEngine.Pool;

namespace BlueWater
{
    public class Liquid : MonoBehaviour
    {
        [SerializeField]
        private SpriteRenderer _spriteRenderer;

        [SerializeField, Range(0f, 2f)]
        private float _distanceThreshold = 0.5f;
        
        private IObjectPool<Liquid> _managedPool;
        private LiquidController _liquidController;
        private Collider2D _targetCollider;
        
        public void SetManagedPool(IObjectPool<Liquid> pool) => _managedPool = pool;
        public void Destroy() => _managedPool.Release(this);

        public void Initialize(LiquidController liquidController, Collider2D targetCollider, Color color)
        {
            _liquidController = liquidController;
            _targetCollider = targetCollider;
            _spriteRenderer.color = color;
        }

        private void Update()
        {
            if (!_targetCollider) return;

            var closestPoint = _targetCollider.ClosestPoint(transform.position);
            var distance = Vector2.Distance(transform.position, closestPoint);

            if (distance < _distanceThreshold)
            {
                OnReached();
            }
        }

        private void OnReached()
        {
            Destroy();
            _liquidController.OnLiquidReached();
        }
    }
}