EnemyBehaviour.cs

using UnityEngine;

namespace EnemyBehaviour
{
  public class Attack : IEnemyBehaviour
  {
    public EnemyController EnemyCtrl
    {
      get => mobile.m_EnemyController;
    }

    EnemyMobile mobile;

    GameObject gameObject;

    private Vector3 LastKnownPlayerPosition
    {
      get => EnemyCtrl.knownDetectedTarget.transform.position;
    }

    public Attack(EnemyMobile enemy)
    {
      mobile = enemy;
      gameObject = mobile.gameObject;
    }
    public void UpdateCurrentAIState()
    {
      if (Vector3.Distance(LastKnownPlayerPosition, EnemyCtrl.detectionSourcePoint.position) >= (mobile.attackStopDistanceRatio * EnemyCtrl.attackRange))
      {
        EnemyCtrl.SetNavDestination(LastKnownPlayerPosition);
      }
      else
      {
        EnemyCtrl.SetNavDestination(gameObject.transform.position);
      }
      EnemyCtrl.OrientTowards(LastKnownPlayerPosition);
      EnemyCtrl.TryAtack((LastKnownPlayerPosition - EnemyCtrl.weapon.transform.position).normalized);
    }

    public IEnemyBehaviour UpdateAIStateTransitions()
    {
      if (!EnemyCtrl.isTargetInAttackRange)
      {
        return new Follow(mobile);
      }

      return this;
    }
  }

  public class Follow : IEnemyBehaviour
  {
    public EnemyController EnemyCtrl
    {
      get => mobile.m_EnemyController;
    }

    public GameObject gameObject;

    EnemyMobile mobile;

    private Vector3 LastKnownPlayerPosition
    {
      get => EnemyCtrl.knownDetectedTarget.transform.position;
    }

    public Follow(EnemyMobile enemy)
    {
      mobile = enemy;
      gameObject = mobile.gameObject;
    }

    public void UpdateCurrentAIState()
    {
      EnemyCtrl.SetNavDestination(LastKnownPlayerPosition);
      EnemyCtrl.OrientTowards(LastKnownPlayerPosition);
    }

    public IEnemyBehaviour UpdateAIStateTransitions()
    {
      if (EnemyCtrl.isSeeingTarget && EnemyCtrl.isTargetInAttackRange)
      {
        return new Attack(mobile);
      }

      return this;
    }
  }

  public class Patrol : IEnemyBehaviour
  {
    public EnemyController EnemyCtrl
    {
      get => mobile.m_EnemyController;
    }

    GameObject gameObject;

    EnemyMobile mobile;

    public Patrol(EnemyMobile enemy)
    {
      mobile = enemy;
      gameObject = mobile.gameObject;
    }

    public void UpdateCurrentAIState()
    {
      EnemyCtrl.UpdatePathDestination();
      EnemyCtrl.SetNavDestination(EnemyCtrl.GetDestinationOnPath());
    }

    public IEnemyBehaviour UpdateAIStateTransitions()
    {
      return this;
    }
  }
}