from build123d import *
from ocp_vscode import show

# ==========================================
# --- MASTER PARAMETER ---
# Defines the outer diameter in mm. 
# Change this single value to scale the entire model!
model_size = 35.0  
# ==========================================

# --- Derived Parameters ---
# All dimensions are calculated as fractions of the original 35mm baseline
outer_diameter = model_size
inner_diameter = model_size * (29.0 / 35.0)
thickness      = model_size * (2.0 / 35.0)

# Pin dimensions
pin_diameter   = model_size * (2.0 / 35.0)
pin_length     = model_size * (5.0 / 35.0)
pin_spacing    = model_size * (14.0 / 35.0) # Distance from center to each pin

# --- Lightning Bolt Proportions ---
# W is a safe overhang width (guaranteed to be outside the ring for clean intersection)
W = outer_diameter * 1.2

# Vertical (Y) heights for the horizontal bars
y_top_outer = model_size * (4.0 / 35.0)
y_top_inner = model_size * (2.0 / 35.0)
y_bot_outer = model_size * (-4.0 / 35.0)
y_bot_inner = model_size * (-2.0 / 35.0)

# Horizontal (X) positions mapping the central diagonal cut
x_inner_left  = model_size * (-2.0 / 35.0)
x_diag_bot    = model_size * (-6.0 / 35.0)
x_inner_right = model_size * (2.0 / 35.0)
x_diag_top    = model_size * (6.0 / 35.0)


with BuildPart() as opel_pin:
    # 1. Base Ring
    with BuildSketch() as ring_sketch:
        Circle(outer_diameter / 2)
        Circle(inner_diameter / 2, mode=Mode.SUBTRACT)
    extrude(amount=thickness)

    # 2. Lightning Bolt Profile (Fully Parametric)
    with BuildSketch() as bolt_sketch:
        # Drawing the Z-shape using our dynamic variables
        pts = [
            (-W, y_top_outer),             # 1. Top-left outer edge
            (-W, y_bot_inner),             # 2. Bottom-left outer edge
            (x_inner_left, y_bot_inner),   # 3. Inner bottom-left corner
            (x_diag_bot, y_bot_outer),     # 4. Diagonal drop to the lower bar
            (W, y_bot_outer),              # 5. Bottom-right outer edge
            (W, y_top_inner),              # 6. Top-right outer edge
            (x_inner_right, y_top_inner),  # 7. Inner top-right corner
            (x_diag_top, y_top_outer)      # 8. Diagonal rise back to the upper bar
        ]
        Polygon(*pts)
        
        # Cleanly slice off the overhangs using the outer circle
        Circle(outer_diameter / 2, mode=Mode.INTERSECT)
    extrude(amount=thickness)

    # 3. Mounting Pins (on the back face)
    bottom_face = opel_pin.faces().sort_by(Axis.Z)[0]
    
    with BuildSketch(bottom_face) as pin_sketch:
        # Place pins dynamically based on the scale
        with Locations((-pin_spacing, 0), (pin_spacing, 0)):
            Circle(pin_diameter / 2)
            
    extrude(amount=pin_length)

# --- Send to OCP CAD Viewer ---
show(opel_pin)