EnemyAI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CustomEnemyAI : MonoBehaviour
{
    public Transform target;
    public float moveSpeed;
    public float rotationSpeed;
    public float sinkSpeed;


    public float attackDistance = 1f;


    public float radius = 3f;


    public bool showEnemyDebug;

    public EnemyShooting shootProjectile;

    void Start()
    {
        shootProjectile = GetComponentInChildren<EnemyShooting>();
    }



    void Update()
    {
        if (Vector3.Distance(target.position, transform.position) > attackDistance)
        {
            Debug.Log("Holding fire!");
        }
        else
        {
            Debug.Log("Attacking!!!");

            // For now enemy will stop in the same position as the target gameobject
            moveSpeed = 0;
            rotationSpeed = 0;
            //shootProjectile.Shoot();
        }

       

        target = GameObject.FindGameObjectWithTag("Target").transform;
        target.LookAt(target);

        transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(target.transform.position - transform.position), rotationSpeed * Time.deltaTime);
        transform.position += transform.forward *  Time.deltaTime * moveSpeed;
        transform.Translate(Vector3.down * sinkSpeed * Time.deltaTime);
    }

    void OnDrawGizmosSelected()
    {
        Gizmos.color = Color.green;
        Gizmos.DrawWireSphere(transform.position, radius);
    }

    void OnDrawDizmos()
    {
        Gizmos.color = Color.clear;
    }


    public void Sink()
    {
        moveSpeed = 0.5f;
        sinkSpeed = 0.5f;
        gameObject.GetComponent<Rigidbody>().isKinematic = true;


    }

}