"""Parametric V1 connecting-rod sample routed to the build123d backend."""

from build123d import Align, Box, BuildPart, BuildSketch, Cylinder, Location, Locations, Mode, Plane, SlotOverall, extrude


CENTER_DISTANCE = 120.0
THICKNESS = 14.0

BIG_END_OUTER_DIAMETER = 56.0
BIG_END_BORE_DIAMETER = 36.0
SMALL_END_OUTER_DIAMETER = 36.0
SMALL_END_BORE_DIAMETER = 20.0

WEB_WIDTH = 24.0
POCKET_LENGTH = 72.0
POCKET_WIDTH = 12.0
POCKET_DEPTH = 3.0


def gen_step():
    """Return a closed, STEP-ready connecting-rod solid in millimeters."""
    half_distance = CENTER_DISTANCE / 2.0

    with BuildPart() as rod:
        with Locations(Location((-half_distance, 0.0, 0.0))):
            Cylinder(
                radius=BIG_END_OUTER_DIAMETER / 2.0,
                height=THICKNESS,
                align=(Align.CENTER, Align.CENTER, Align.MIN),
            )

        with Locations(Location((half_distance, 0.0, 0.0))):
            Cylinder(
                radius=SMALL_END_OUTER_DIAMETER / 2.0,
                height=THICKNESS,
                align=(Align.CENTER, Align.CENTER, Align.MIN),
            )

        Box(
            CENTER_DISTANCE,
            WEB_WIDTH,
            THICKNESS,
            align=(Align.CENTER, Align.CENTER, Align.MIN),
        )

        with Locations(Location((-half_distance, 0.0, -1.0))):
            Cylinder(
                radius=BIG_END_BORE_DIAMETER / 2.0,
                height=THICKNESS + 2.0,
                align=(Align.CENTER, Align.CENTER, Align.MIN),
                mode=Mode.SUBTRACT,
            )

        with Locations(Location((half_distance, 0.0, -1.0))):
            Cylinder(
                radius=SMALL_END_BORE_DIAMETER / 2.0,
                height=THICKNESS + 2.0,
                align=(Align.CENTER, Align.CENTER, Align.MIN),
                mode=Mode.SUBTRACT,
            )

        with BuildSketch(Plane.XY):
            SlotOverall(width=POCKET_LENGTH, height=POCKET_WIDTH)
        extrude(amount=POCKET_DEPTH, mode=Mode.SUBTRACT)

        with BuildSketch(Plane.XY.offset(THICKNESS - POCKET_DEPTH)):
            SlotOverall(width=POCKET_LENGTH, height=POCKET_WIDTH)
        extrude(amount=POCKET_DEPTH, mode=Mode.SUBTRACT)

    result = rod.part
    result.label = "cad_router_v1_connecting_rod"
    return result