Whip's Fixed Weapon Drone Code [SpaceEngineers]

/*
/// Whip's Fixed Weapon Drone Mod - rev 3.0 - 9/21/15 ///
*/

double range = 400; //range in meters
double degree_tolerance = 5;
string message;
string range_m = "0";
string angle_m =  "0";
string shoot_m = "null";

List<IMyTerminalBlock> remotes = new List<IMyTerminalBlock>();
List<IMyTerminalBlock> blocks = new List<IMyTerminalBlock>();
List<IMyTerminalBlock> weapons = new List<IMyTerminalBlock>();
List<IMyTerminalBlock> antennas = new List<IMyTerminalBlock>();

void Main()
{
    IMyTimerBlock frontRefrence = GridTerminalSystem.GetBlockWithName("Timer - Drone Front") as IMyTimerBlock;
    if (frontRefrence == null)
    {
        message = "ERROR: No front refrence set";
        Echo("ERROR: No front refrence set");
        return;
    }
    else
    {
        Echo("WMI Drone Systems Online");
    }

    GridTerminalSystem.GetBlocksOfType<IMyTerminalBlock>(blocks);
    for (int i=0 ; i < blocks.Count ; i++)
    {
        if(blocks[i] is IMyLargeTurretBase) continue; //ignore turrets
        if(!(blocks[i] is IMyUserControllableGun)) continue; //ignore everything not a weapon
        weapons.Add(blocks[i] as IMyUserControllableGun); //add weapons to list
    }

    GridTerminalSystem.GetBlocksOfType<IMyRemoteControl>(remotes);
    if (remotes.Count > 0)
    {
        var remote = remotes[0] as IMyRemoteControl;
        remote.ClearWaypoints();

    //making empty vector for us to populate
        Vector3D playerPosition = new Vector3D(0, 0, 0);
        Vector3D currentPosition = new Vector3D(0, 0, 0);
        Vector3D currentFront = new Vector3D(0, 0, 0);
        Vector3D shipVector = new Vector3D(0, 0, 0);
        Vector3D playerVector = new Vector3D(0, 0, 0);
        Vector3D difference = new Vector3D(0, 0, 0);

        bool success = remote.GetNearestPlayer(out playerPosition);
        remote.ApplyAction("CollisionAvoidance_On");
        if (success)
        {
            remote.AddWaypoint(playerPosition, "Player"); //follow player
            remote.SetAutoPilotEnabled(true); //enable autopilot

        //populating our vectors
            currentPosition = remote.GetPosition(); //position vector of ship
            currentFront = frontRefrence.GetPosition(); //position vector of front of ship
            shipVector = Vector3D.Subtract(currentFront, currentPosition); //direction vector of ship
            playerVector = Vector3D.Subtract(playerPosition, currentPosition); //direction vector of player

        //some gross vector math
            double dist = Vector3D.Distance(currentPosition, playerPosition);
            range_m = dist.ToString(); //gives us distance between player and ship

            double dotProduct;
            Vector3D.Dot(ref shipVector, ref playerVector, out dotProduct);

            double x = dotProduct / shipVector.Length() / playerVector.Length();
            double theta_deg = Math.Acos(x) * 180f / Math.PI; //angle between ship and player
            angle_m = theta_deg.ToString(); //debug

        //in range
            if (dist < range && theta_deg < degree_tolerance)
            {
                for (int i=0 ; i < weapons.Count ; i++)
                {
                    var weaponToShoot = weapons[i] as IMyUserControllableGun;
                    weaponToShoot.ApplyAction("Shoot_On");
                    shoot_m = "In Range";
                }
            }
        //not in range
            else
            {
                for (int i=0 ; i < weapons.Count ; i++)
                {
                    var weaponToShoot = weapons[i] as IMyUserControllableGun;
                    weaponToShoot.ApplyAction("Shoot_Off");
                    shoot_m = "Out of Range";
                }
            }
        }

    //for debugging since we can't access the ship once it is owned
        GridTerminalSystem.GetBlocksOfType<IMyRadioAntenna>(antennas);
        var antenna = antennas[0] as IMyRadioAntenna;
        message = "Antenna\nRange: " + range_m
            + "\nAngle: " + angle_m
            + "\nStatus: " + shoot_m;
        antenna.SetCustomName(message);
    }
}