class MothershipFactory : ActionRole {

    @Attribute
    var delay = 0.0

    @Attribute
    var ships = 3

    @Attribute
    var interval = 10.0
    
    @Attribute
    var mothershipBirthPeriod = 300

    @Attribute
    var mothershipMaxChildren = 10

    @Attribute
    var mothershipFireFrequency = 100

    @Attribute
    val mothershipVelocity = Vector2( 0, 0 )

    @Attribute
    var mothershipBulletSpeed = 3.0


    override fun createAction() : Action {
        return (
            Delay( delay ) thenOnce
            this:>createMothership then
            Delay( interval )
        ).repeat( ships )
    }

    fun createMothership() {
        val mothershipA = actor.createChild( "mothership" )
        mothershipA.direction.radians = actor.direction.radians

        val mothership = (mothershipA.role as Mothership)
        mothership.birthPeriod = mothershipBirthPeriod
        mothership.maxChildren = mothershipMaxChildren
        mothership.fireFrequency = mothershipFireFrequency
        mothership.bulletSpeed = mothershipBulletSpeed
        // NOTE, we cannot use "=", because then all of the motherships would SHARE the
        // same velocity, they wouldn't move independantly.
        mothership.velocity.set( mothershipVelocity )
    }

}