class ChopTest : Model {

    override fun build() : Shape3d {
        val sq = Square( 300, 400 ).rotate(45 )
        return Chop.chopZ( sq.extrude( 500 ), sq )
    }
}

@Data
class Chop(

    val shape : Shape3d,

    val orientation : int,
    val position : float,
    val crossSection : Shape2d,

    val bumpSpacing : float,

    val bumpSize : Vector2,
    val clearance : float

) : Lazy3d() {

    func chopZ( shape : Shape3d, crossSection : Shape2d ) : Chop {
        return Chop( shape, 2, shape.middle.z, crossSection, 100, Vector2( 16, 10 ), 0.5 )
    }
    func chopZ( shape : Shape3d ) : Chop {
        val crossSection = Square( shape.size.x, shape.size.y )
            .frontTo( shape.front )
            .leftTo( shape.left )
        return chopZ( shape, crossSection )
    }

    meth bump() = Cylinder( bumpSize.x / 2, bumpSize.y, bumpSize.y*0.5 )
    meth hole() = Cylinder( bumpSize.x / 2 + clearance, bumpSize.y + clearance, bumpSize.y*0.5 + clearance )

    meth bumpsOrHoles( bumpOrHole : Shape3d ) : Shape3d {
        val within = crossSection.offset( - bumpSize.x )
        var result : Shape3d = Union3d()

        val bumpsX = crossSection.size.x ~/ bumpSpacing
        val bumpsY = crossSection.size.y ~/ bumpSpacing
        val left = crossSection.middle.x - (bumpsX-1) * bumpSpacing/2
        val front = crossSection.middle.y - (bumpsY-1) * bumpSpacing/2

        println( "Bumps : $bumpsX" )

        for (ix in 0 until bumpsX ) {
            val x = left + ix * bumpSpacing

            for (iy in 0 until bumpsY ) {
                val y = front + iy * bumpSpacing

                val pos = Vector2( x, y )
                if (within.contains(pos)) {
                    println( "Yes $pos" )
                    result = result + bumpOrHole.translate( x, y, 0 )
                } else {
                    println( "No $pos" )
                }
            }
        }

        return result.translateZ( position )
    }

    meth bumps() : Shape3d {
        return bumpsOrHoles( bump() )
    }

    meth holes() : Shape3d {
        return bumpsOrHoles( hole() )
    }

    meth partA() : Shape3d {
        val bumps = bumps()
        val bounding = shape.boundingCube().topTo( position-clearance/2 )
        val part = shape.intersection( bounding ) + bumps

        return part
    }

    meth partB() : Shape3d {
        val holes = holes()
        val bounding = shape.boundingCube().bottomTo( position+clearance/2 )
        val part = shape.intersection( bounding ) - holes

        return part.translateZ( -position )
    }

    override fun build() : Shape3d {

        val a = partA()
        val b = partB()

        return a + b.leftTo( a.right + 10 )
    }

}