// Simple airplane script example

// THIS SCRIPT IS PUBLIC DOMAIN! Do not delete the credits at the top of this script!

// Nov 25, 2003 - created by Andrew Linden and posted in the Second Life scripting forum
// Jan 05, 2004 - Cubey Terra - minor changes: customized controls, added enable/disable physics events
// Feel free to copy, modify, and use this script.

// Always give credit to Andrew Linden and all people who modify it in a readme or in the object description.



// assumes that the root primitive is oriented such that its
// local x-axis points toward the nose of the plane, and its
// local z-axis points toward the top

// control flags that we set later
integer gAngularControls = 0;
integer gLinearControls = 0;

// we keep track of angular history for more responsive turns
integer gOldAngularLevel = 0;

// the linear motor uses an accumulator model rather than keeping track
// of the linear control level history
vector gLinearMotor = <0, 0, 0>;

default
{
    state_entry()
    {
        llSetSitText("Fly");
        llCollisionSound("", 0.0);

        // the sit and camera placement is very shape dependent
        // so modify these to suit your vehicle
        llSitTarget(<0.6, 0.0, 0.20>, ZERO_ROTATION);
        llSetCameraEyeOffset(<-10.0, 0.0, 2.0> );
        llSetCameraAtOffset(<3.0, 0.0, 1.0> );

        llSetVehicleType(VEHICLE_TYPE_AIRPLANE);

        // weak angular deflection
         llSetVehicleFloatParam(VEHICLE_ANGULAR_DEFLECTION_EFFICIENCY, 0.1);
         llSetVehicleFloatParam(VEHICLE_ANGULAR_DEFLECTION_TIMESCALE, 1.0);

        // strong linear deflection
         llSetVehicleFloatParam(VEHICLE_LINEAR_DEFLECTION_EFFICIENCY, 1.0);
         llSetVehicleFloatParam(VEHICLE_LINEAR_DEFLECTION_TIMESCALE, 0.2);

        // somewhat responsive linear motor
         llSetVehicleFloatParam(VEHICLE_LINEAR_MOTOR_TIMESCALE, 0.5);
         llSetVehicleFloatParam(VEHICLE_LINEAR_MOTOR_DECAY_TIMESCALE, 20);

        // somewhat responsive angular motor, but with 3 second decay timescale
         llSetVehicleFloatParam(VEHICLE_ANGULAR_MOTOR_TIMESCALE, 0.5);
         llSetVehicleFloatParam(VEHICLE_ANGULAR_MOTOR_DECAY_TIMESCALE, 3);

        // very weak friction
         //llSetVehicleVectorParam(VEHICLE_LINEAR_FRICTION_TIMESCALE, <1000.0, 1000.0, 1000.0> ); // CUBEY - original line
         llSetVehicleVectorParam( VEHICLE_LINEAR_FRICTION_TIMESCALE, <200, 20, 20> ); // CUBEY - increased friction
         llSetVehicleVectorParam(VEHICLE_ANGULAR_FRICTION_TIMESCALE, <1000.0, 1000.0, 1000.0> );

         llSetVehicleFloatParam(VEHICLE_VERTICAL_ATTRACTION_EFFICIENCY, 0.65);  // almost wobbly - CUBEY - increased from .25 to improve stability
         llSetVehicleFloatParam(VEHICLE_VERTICAL_ATTRACTION_TIMESCALE, 1.5);    // mediocre response

         llSetVehicleFloatParam(VEHICLE_BANKING_EFFICIENCY, 0.4);    // medium strength
        llSetVehicleFloatParam(VEHICLE_BANKING_TIMESCALE, 0.1);     // very responsive
        llSetVehicleFloatParam(VEHICLE_BANKING_MIX, 0.95);          // more banking when moving

        // hover can be better than sliding along the ground during takeoff and landing
        // but it only works over the terrain (not objects)
        //llSetVehicleFloatParam(VEHICLE_HOVER_HEIGHT, 3.0);
        //llSetVehicleFloatParam(VEHICLE_HOVER_EFFICIENCY, 0.5);
        //llSetVehicleFloatParam(VEHICLE_HOVER_TIMESCALE, 2.0);
        //llSetVehicleFlags(VEHICLE_FLAG_HOVER_UP_ONLY);

        // non-zero buoyancy helps the airplane stay up
        // set to zero if you don't want this crutch
        llSetVehicleFloatParam(VEHICLE_BUOYANCY, 0.2);

        // define these here for convenience later 
        // CUBEY - modified these as per Shadow's prefs
        gAngularControls = CONTROL_RIGHT | CONTROL_LEFT | CONTROL_ROT_RIGHT | CONTROL_ROT_LEFT | CONTROL_BACK | CONTROL_FWD;
        gLinearControls = CONTROL_UP | CONTROL_DOWN;

        llSetStatus(STATUS_PHYSICS, FALSE); //CUBEY - ensure that physics are disabled when plane is rezzed so it doesn't fly off
    }

    changed(integer change)
    {
        if (change & CHANGED_LINK)
        {
            key agent = llAvatarOnSitTarget();
            if (agent)
            {
                if (agent != llGetOwner())
                {
                    // only the owner can use this vehicle
                    llSay(0, "You aren't the owner -- only the owner can fly this plane.");
                    llUnSit(agent);
                    llPushObject(agent, <0,0,10>, ZERO_VECTOR, FALSE);
                }
                else
                {
                    // clear linear motor on successful sit
                    gLinearMotor = <0, 0, 0>;
                     llSetVehicleVectorParam(VEHICLE_LINEAR_MOTOR_DIRECTION, gLinearMotor);

                    //llSetStatus(STATUS_PHYSICS, TRUE);
                     llSetVehicleFloatParam(VEHICLE_LINEAR_FRICTION_TIMESCALE, 1000.0);
                     llSetVehicleFloatParam(VEHICLE_ANGULAR_FRICTION_TIMESCALE, 1000.0);
                    llRequestPermissions(agent, PERMISSION_TRIGGER_ANIMATION | PERMISSION_TAKE_CONTROLS);
                }
            }
            else
            {
                // stop the motors
                gLinearMotor = <0, 0, 0>;
                 llSetVehicleVectorParam(VEHICLE_LINEAR_MOTOR_DIRECTION, gLinearMotor);
                 llSetVehicleVectorParam(VEHICLE_ANGULAR_MOTOR_DIRECTION, gLinearMotor);

                // use friction to stop the vehicle rather than pinning it in place
                //llSetStatus(STATUS_PHYSICS, FALSE);
                 llSetVehicleFloatParam(VEHICLE_LINEAR_FRICTION_TIMESCALE, 1.0);
                 llSetVehicleFloatParam(VEHICLE_ANGULAR_FRICTION_TIMESCALE, 1.0);

                // driver is getting up
                llReleaseControls();
                llStopAnimation("sit");
                llSetStatus(STATUS_PHYSICS, FALSE); //CUBEY - turn off physics to make sure the parked plane can't be moved
            }
        }

    }

    run_time_permissions(integer perm)
    {
        if (perm)
        {
            llStartAnimation("sit");
            llTakeControls(gAngularControls | gLinearControls, TRUE, FALSE);
            llSetStatus(STATUS_PHYSICS, TRUE); //CUBEY - enable physics when avatar sits
        }
    }

    control(key id, integer level, integer edge)
    {
        // only change linear motor if one of the linear controls are pressed
        vector motor;
        integer motor_changed = level & gLinearControls;
        if (motor_changed)
        {
            if(level & CONTROL_UP) //CUBEY
            {
                if (gLinearMotor.x < 0)
                {
                    gLinearMotor.x = 0;
                }
                else if (gLinearMotor.x < 30)
                {
                    gLinearMotor.x += 5;
                }
                motor_changed = TRUE;
            }
            if(level & CONTROL_DOWN) //CUBEY
            {
                if (gLinearMotor.x > 0)
                {
                    gLinearMotor.x = 0;
                }
                else if (gLinearMotor.x > -30)
                {
                    gLinearMotor.x -= 5;
                };
                motor_changed = TRUE;
            }
             llSetVehicleVectorParam(VEHICLE_LINEAR_MOTOR_DIRECTION, gLinearMotor);
        }

        // only change angular motor if the angular levels have changed
        motor_changed = (edge & gOldAngularLevel) + (level & gAngularControls);
        if (motor_changed)
        {
            motor = <0,0,0>;
            if(level & (CONTROL_RIGHT|CONTROL_ROT_RIGHT))
            {
                // add roll component ==> triggers banking behavior
                motor.x += 10;
            }
            if(level & (CONTROL_LEFT|CONTROL_ROT_LEFT))
            {
                motor.x -= 10;
            }
            if(level & (CONTROL_BACK)) // CUBEY
            {
                // add pitch component ==> causes vehicle lift nose (in local frame)
                motor.y -= 8;
            }
            if(level & (CONTROL_FWD)) // CUBEY
            {
                motor.y += 8;
            }
             llSetVehicleVectorParam(VEHICLE_ANGULAR_MOTOR_DIRECTION, motor);
        }
        // store the angular level history for the next control callback
        gOldAngularLevel = level & gAngularControls;
    }
}