AsteroidGame/Assets/Entities/Scripts/Targeter.cs

using UnityEngine;

namespace AsteroidGame.Entities
{
    public class Targeter : MonoBehaviour
    {
        [SerializeField] private float _range;
        [SerializeField] private EntityBase _targeterParent;
        [SerializeField] private EntityBase _targetEntity;
        [SerializeField] private SoTargeterConfig.TargetStrategy _targetStrategy;
        [SerializeField] private SoEntityBaseRuntimeSet _activeEntities;

        public void SetParent(EntityBase newParent) => _targeterParent = newParent;

        public void SetConfig(SoTargeterConfig config)
        {
            _range = config._range;
            _targetStrategy = config._selectedTargetStrategy;
            _activeEntities = config._activeEntities;
        }

        public EntityBase GetTarget()
        {
            return _targetEntity;
        }

        public bool FoundTarget()
        {
            float currentBestValue = Mathf.Infinity;
            var targetFound = false;

            foreach (EntityBase targetEntity in _activeEntities._list)
            {
                float distanceToTarget =
                    Vector3.Magnitude(targetEntity.GetCenterPosition() - _targeterParent.GetCenterPosition());

                bool withinRange = distanceToTarget < _range;
                if (withinRange)
                {
                    switch (_targetStrategy)
                    {
                        case SoTargeterConfig.TargetStrategy.LowestRange:
                        {
                            bool isClosest = distanceToTarget < currentBestValue;
                            if (isClosest)
                            {
                                targetFound = true;
                                currentBestValue = distanceToTarget;
                                _targetEntity = targetEntity;
                            }

                            break;
                        }
                        case SoTargeterConfig.TargetStrategy.LowestHealth:
                        {
                            float enemyHealth = targetEntity.GetHealth();

                            bool isLowestHealth = enemyHealth < currentBestValue;
                            if (isLowestHealth)
                            {
                                targetFound = true;
                                currentBestValue = enemyHealth;
                                _targetEntity = targetEntity;
                            }

                            break;
                        }
                    }
                }
            }

            return targetFound;
        }
    }
}