FPSGame/Assets/Enemies/EnemyAI.cs

using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.AI;

public class EnemyAI : MonoBehaviour, IAggroable
{
    [Header("Configuration")]
    [SerializeField] private float _detectRange = 15f;
    [SerializeField] private float _attackRange = 5f;
    [SerializeField] private float _rotationSpeed = 0.1f;
    [Header("State")]
    [SerializeField] private Transform _target;
    [SerializeField] private bool _isProvoked;
    [SerializeField] private bool _isDead;

    private NavMeshAgent _navMeshAgent;
    private Animator _animator;
    private EnemyHealth _enemyHealth;
    private static readonly int MoveAnimation = Animator.StringToHash("Move");
    private static readonly int AttackAnimation = Animator.StringToHash("Attack");
    private static readonly int IdleAnimation = Animator.StringToHash("Idle");
    private static readonly int DeathAnimation = Animator.StringToHash("Die");

    public bool IsProvoked
    {
        get => _isProvoked;
        set => _isProvoked = value;
    }

    private void Awake()
    {
        _target = FindObjectOfType<PlayerHealth>().transform;
    }

    private void Start()
    {
        _navMeshAgent = GetComponent<NavMeshAgent>();
        _animator = GetComponent<Animator>();
        _enemyHealth = GetComponent<EnemyHealth>();
        SetStopDistance(_attackRange * 0.9f);
    }

    private void Update()
    {
        if (!_isDead)
        {
            if (DistanceToTarget(_target.position) < _detectRange)
            {
                _isProvoked = true;
            }

            if (_isProvoked)
            {
                EngageTarget();
            }

            if (_enemyHealth.IsDead)
            {
                _animator.SetTrigger(DeathAnimation);
                _navMeshAgent.isStopped = true;
                _isDead = true;
            }
        }
    }

    private void EngageTarget()
    {
        if (DistanceToTarget(_target.position) <= _attackRange)
        {
            AttackTarget();
        }
        else if (_isProvoked)
        {
            FollowTarget();
        }
        else
        {
            Idle();
        }
    }

    private void FollowTarget()
    {
        _animator.SetTrigger(MoveAnimation);
        _animator.SetBool(AttackAnimation, false);
        _navMeshAgent.SetDestination(_target.position);
    }

    private void AttackTarget()
    {
        _animator.SetBool(AttackAnimation, true);
        FaceTarget();
        //print("Die Human!");
    }

    private void Idle()
    {
        _animator.SetTrigger(IdleAnimation);
    }

    private void SetStopDistance(float stopDistance)
    {
        _navMeshAgent.stoppingDistance = stopDistance;
    }

    private float DistanceToTarget(Vector3 targetPosition)
    {
        return Vector3.Distance(gameObject.transform.position, targetPosition);
    }

    private void FaceTarget()
    {
        Vector3 direction = (_target.position - transform.position).normalized;
        Quaternion lookRotation = Quaternion.LookRotation(new Vector3(direction.x, 0, direction.z));
        transform.rotation = Quaternion.Slerp(transform.rotation, lookRotation, Time.deltaTime * _rotationSpeed);
    }

    void OnDrawGizmosSelected()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(transform.position, _detectRange);
        if (_navMeshAgent != null)
        {
            Gizmos.color = Color.blue;
            Gizmos.DrawWireSphere(transform.position, _navMeshAgent.stoppingDistance);
        }
    }
}