EnemyAI.cs

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

public class EnemyAI : MonoBehaviour {

    public Transform Player; // prefab for the player
    public float playerDistance; // will be measured later to check for distance
    public float rotationDamping; // how dampened the rotation should be

    public GameObject bulletPrefab;
    public Transform bulletEmitter;
    public float FireSpeed; // how fast the bullet should travel?
    public float FireFrequency; // how often they will fire?
    RaycastHit target;

    private float timer = 0;

    public const int maxHealth = 3;
    public int currentHealth = maxHealth;

    void Update () {
        DistanceToLookAt ();
    }

    void OnCollisionEnter (Collision collision){

        if (GameObject.FindGameObjectWithTag ("playerBullet")) {
            Destroy (collision.collider.gameObject);
            currentHealth -= 1;
        }

        if (currentHealth == 0)
            Destroy(gameObject);
    }

    void DistanceToLookAt(){
        playerDistance = Vector3.Distance (Player.position, transform.position);

        timer += Time.deltaTime;

        if (playerDistance < 150f) {
            lookAtPlayer ();
            Debug.Log ("Looking at player!");
        }

        if (playerDistance < 75f) {
            if (timer > FireFrequency) {
                FireAtPlayer ();
                timer = 0;
            }
            Debug.Log ("Firing at the player!");
        }
    }

    void lookAtPlayer(){
        Quaternion rotation = Quaternion.LookRotation (Player.position - transform.position);
        transform.rotation = Quaternion.Slerp (transform.rotation, rotation, Time.deltaTime * rotationDamping);
    }

    void FireAtPlayer(){
        GameObject BulletInstance = Instantiate(bulletPrefab, bulletEmitter.position, bulletEmitter.rotation) as GameObject;
        Rigidbody launch = BulletInstance.GetComponent<Rigidbody>();
        launch.velocity = FireSpeed * bulletEmitter.forward;
        Destroy (BulletInstance, 6f);
    }
}