i'm trying to create my own raycast AI and I want the enemy to stop following the player when something gets between them. here is my code so far; it moves by its self and it follows the player when they get into range:

var speed : float = 6;
var rotateSpeed : float = 10;
private var direction : float;
var forwardRay : float = 5;
var leftRay : float = 5;
var rightRay : float = 5;
var player : Transform;
var MaxDistance : int = 30;
var MinDistance : int = 5;
var hidden : boolean = true;

function Update () {

Patrol();

var distance : Vector3 = player.position - transform.position;
    //if player is in range, enemy will follow
    if(distance.magnitude < MaxDistance){
        Debug.DrawLine(transform.position, player.position);
        //if something is 4 units away from the enemy, the player becomes hidden
        if(Physics.Raycast(transform.position, player.position, 4)){
            hidden = true;
        }else{
            hidden = false;
        }
    }else{
        hidden = true;
    }
}

function Patrol(){
    //if the player is hidden, the enemy will patrol
    if(hidden){
        //if there is nothing within range, then move forward
        if(!Physics.Raycast(transform.position, transform.forward, forwardRay)){
            transform.Translate(Vector3.forward * speed * Time.smoothDeltaTime);
        }else{
            //if there is something to the left, then direction = 1
            if(Physics.Raycast(transform.position, -transform.right, leftRay)){
                direction = 1;
            //if there is something to the right, the direction = -1
            }else if(Physics.Raycast(transform.position, transform.right, rightRay)){
                direction = -1;
            //if there is nothing to the left or right, then direction = 1
            }else{
                direction = 1;
            }
            //rotate 90 degrees in the direction (1 = right, -1 = left)
            transform.Rotate(Vector3.up, 90 * rotateSpeed * direction);
        }
    //if the player is not hidden...
    }else if(!hidden){
        var distance : Vector3 = player.position - transform.position;

        //move towards player
        velocity = distance.normalized * speed;
        rigidbody.velocity = velocity;
    }
}