public class enemyMoveEngine : MonoBehaviour
{

    public Vector3 playerPos;
    public float activeRange;
    public float fireRange;
    public GameObject ammoType;
    public float acceleration;
    public float delay;
    public float currentDelay;
    public float initialDrag;
    public float dragMultiplier;
    public float correctionBoostMulti;
    private Vector3 westEngine;
    private Vector3 eastEngine;
    private Vector3 southEngine;
    private Vector3 northEngine;
    public float correctionTimer;
    public float maxDrag;
    public float playerDistance;
    public float slowDistance;
    public float dragNorm;

    void Awake ()
    {
        rigidbody.drag = initialDrag;
        currentDelay = delay;
        westEngine = new Vector3(1,0,0);
        eastEngine = new Vector3(-1,0,0);
        northEngine = new Vector3(0,0,-1);
        southEngine = new Vector3(0,0,1);
    }

    void Update ()
    {
        playerDistance = Vector3.Distance (transform.position, playerPos);
        playerPos = GameObject.Find ("mainShip").transform.position - transform.position;
        currentDelay -= 1;
        fireEngines ();
        fireAtPlayer ();
        Debug.Log(rigidbody.drag);
    }

    void fireEngines ()
    {
        if (Vector3.Distance (transform.position, playerPos) <= activeRange) {
            if (playerPos.x > 0)
            {
                engineBoost(westEngine, correctionTimer);
            }
            if (playerPos.x <= 0)
            {
                engineBoost(eastEngine, correctionTimer);
            }
            if (playerPos.z > 0)
            {
                engineBoost(southEngine, correctionTimer);
            }
            if (playerPos.z <= 0)
            {
                engineBoost(northEngine, correctionTimer);
            }
        }
    }

    void fireAtPlayer ()
    {
        if (Vector3.Distance (transform.position, playerPos) <= activeRange && currentDelay <= 0)
        {
            currentDelay = delay;
            Instantiate (ammoType, transform.position, transform.rotation);
        }
    }

    float dragController(float dragVal)
    {
        float dragSet;
        if (playerDistance <= slowDistance)
        {
            dragSet = dragVal + (maxDrag - playerDistance);
            return dragSet;
        }
        else
        {
            return dragVal;
        }
    }
    void engineBoost(Vector3 direction, float correctionCount)
    {
        correctionCount -= 1;

        rigidbody.drag = dragController (initialDrag);
        rigidbody.AddForce((direction * acceleration) * correctionBoostMulti);
        if (correctionCount <=0)
        {
            rigidbody.AddForce((direction * acceleration));
        }
    }
}