var turretHead : Transform;
var turretBarrel : Transform;
var target : Transform;
var rotationToLook : Quaternion;
var rotationEuler : Vector3;

var maxVerticalLook : float = 45;
var maxHorizontalLook : float = 45;
var maxDistance : float = 30;

var distance : float;

var targetLocked : boolean = false;
var targetAquiring : boolean = false;
var targetFiring : boolean = false;

var rocket : Rigidbody;  //our prefab
var throwPower : float = 500; //power variable determines how fast this object will be "shot out"

var lookAt : Transform;

function Update () {

    // Calculate relative position to calculate rotation and distance.
    var relativePos = target.position - transform.position;

    // Calculate Distance of Target
    distance = Vector3.Distance(transform.position,target.position);

    // Calculate Rotation
    rotationToLook = Quaternion.LookRotation(relativePos);
    rotationEuler = rotationToLook.eulerAngles; // Used for debugging

    // Check if target is in range (not yet done) and also if in targeting area
    if ( distance < maxDistance && checkYBounds( rotationToLook, maxHorizontalLook ) && checkXBounds( rotationToLook, maxVerticalLook ) ) {

        // Debug.Log("Turret is in Range");

        if ( targetAquiring == false ) {

            // Starting to Aquire
            StartCoroutine("acquiringTarget");


        } if ( targetLocked == true && targetFiring == false ) {

            // Fire Bullet
            StartCoroutine("fireBullet");


        }


    } else {

        // Revert to Home Position
        rotationEuler = Vector3 ( 0, 0, 0 );

    }


    // Move Turret Head
    var turretHeadEuler : Vector3;
    turretHeadEuler.y = rotationEuler.y;

    var turretHeadqr : Quaternion = Quaternion.Euler(turretHeadEuler);

    turretHead.localRotation = Quaternion.Lerp(turretHead.localRotation, turretHeadqr, Time.deltaTime * 5);



    var turretBarrelEuler : Vector3;
    turretBarrelEuler.z = -rotationEuler.x;
    turretBarrelEuler.y = 0;


    var turretBarrelqr : Quaternion = Quaternion.Euler(turretBarrelEuler);

    turretBarrel.localRotation = Quaternion.Lerp(turretBarrel.localRotation, turretBarrelqr, Time.deltaTime * 5);




}

function checkYBounds( rotationToLook : Quaternion, maxLook : float ) {

        if ( rotationToLook.eulerAngles.y < maxLook || rotationToLook.eulerAngles.y  > ( 360 - maxLook ) ) {

            return true;

        } else {

            return false;

        }
}

function checkXBounds( rotationToLook : Quaternion, maxLook : float ) {

        if ( rotationToLook.eulerAngles.x < maxLook || rotationToLook.eulerAngles.x  > ( 360 - maxLook ) ) {

            return true;

        } else {

            return false;

        }
}



function acquiringTarget() {

    targetAquiring = true;

    yield WaitForSeconds(3);

    targetLocked = true;

    Debug.Log("Auto Turret - Target Acquired - Ready to fire");


}


function fireBullet() {

    targetFiring = true;

    var clone : Rigidbody; //variable within a variable

    clone = Instantiate(rocket, rocket.transform.position, rocket.transform.rotation); //the clone variable holds our instantiate action

    clone.gameObject.SetActive( true );


    clone.rigidbody.AddForce(clone.transform.forward * throwPower);

    yield WaitForSeconds(1);

    targetFiring = false;

}