"""Thick film chip resistor array with convex terminals, Vishay CRA04S, CRA06E/S and CRA12E/S. Centred on the origin with the board on
the XY plane and the length along X: the ceramic body, the protective coating on top, and the terminals along both long sides, each its own
solid, wrapping over the side from the top to the bottom. Pin 1 is at the -X end of the -Y side. Dimensions from Vishay's data sheets; see
the README."""
from steve import Model

array = "CRA06S-8"  # model and terminal count: CRA04S-4, CRA04S-8, CRA06S-4, CRA06S-8, CRA06E-8, CRA12E-8, CRA12E-10 or CRA12S-10

# array: (terminals, corners, L, A, A*, B, B*, P, T, W) in mm, the nominal values of the data sheets' DIMENSIONS tables. L length, W width,
# T height, P terminal pitch, A terminal width, A* corner terminal width (square corners, S version; None for the scalloped E version,
# whose end terminals are A wide on the pitch like the others), B terminal length on top, B* on the bottom.
#   CRA04S: Vishay "CRA04S Thick Film Resistor Array", document number 31043, revision 13-Oct-08, page 249, DIMENSIONS (A* is A1; the
#     4-terminal part has no A, only corner terminals).
#   CRA06E/S: Vishay Dale "CRA06E and S Thick Film, Resistor Array", document number 31002, revision 16-Aug-05, page 7, DIMENSIONS.
#   CRA12E/S: Vishay "CRA12E, CRA12S Thick Film Resistor Array", document number 31003, revision 10-Dec-10, page 250, DIMENSIONS.
ARRAYS = {
    "CRA04S-4": (4, "square", 1.0, None, 0.33, 0.15, 0.25, 0.65, 0.35, 1.0),
    "CRA04S-8": (8, "square", 2.0, 0.30, 0.4, 0.15, 0.25, 0.50, 0.45, 1.0),
    "CRA06S-4": (4, "square", 1.6, 0.38, 0.61, 0.3, 0.3, 0.8, 0.5, 1.5),
    "CRA06S-8": (8, "square", 3.2, 0.38, 0.61, 0.3, 0.3, 0.8, 0.5, 1.5),
    "CRA06E-8": (8, "scalloped", 3.2, 0.38, None, 0.3, 0.3, 0.8, 0.5, 1.5),
    "CRA12E-8": (8, "scalloped", 5.08, 0.79, None, 0.51, 0.38, 1.27, 0.55, 3.05),
    "CRA12E-10": (10, "scalloped", 6.40, 0.79, None, 0.51, 0.38, 1.27, 0.55, 3.05),
    "CRA12S-10": (10, "square", 6.40, 0.79, 0.89, 0.51, 0.38, 1.27, 0.55, 3.05),
}
# Proportions, for looks (the drawings show these but don't dimension them): the terminals' metal is METAL thick, wrapped around a ceramic
# body METAL smaller on each side, top and bottom; the coating on top is METAL thick too and stops MARGIN x W short of the ends and of the
# terminals. So the terminals and the coating stand METAL proud of the ceramic.
METAL = 0.03
MARGIN = 0.05

n, corners, L, A, A_END, B, B_LOW, P, T, W = ARRAYS[array]
per_side = n // 2
model = Model()
model.box("body", L, W - 2 * METAL, T - 2 * METAL, at=(0, 0, T / 2), op="new", body="body_body", name="Body")
# Terminal positions along X: on the pitch, centred; with square corners the end terminals are A* wide and reach the body's ends.
spans = []
for i in range(per_side):
    centre = (i - (per_side - 1) / 2) * P
    if corners == "square" and i in (0, per_side - 1):
        x0 = -L / 2 if i == 0 else L / 2 - A_END
        spans.append((x0, A_END))
    else:
        spans.append((centre - A / 2, A))
terminals = []
for side_tag, side in (("a", -1), ("b", 1)):
    # The terminal's section (y, z) on a YZ plane: along the top B in from the side, down the side, and B* in along the bottom.
    edge = side * W / 2
    inner_top, inner_low, wall = edge - side * B, edge - side * B_LOW, edge - side * METAL
    section = [(inner_top, T), (edge, T), (edge, 0.0), (inner_low, 0.0), (inner_low, METAL), (wall, METAL), (wall, T - METAL),
               (inner_top, T - METAL)]
    for i, (x0, width) in enumerate(spans):
        tag = f"t{side_tag}{i + 1}"
        model.plane(f"{tag}_plane", on="YZ", offset=x0, name="Terminals")
        with model.sketch(f"{tag}_sketch", on=f"{tag}_plane", name="Terminals") as sk:
            sk.polyline(f"{tag}_section", section, closed=True)
        model.extrude(tag, f"{tag}_sketch", distance=width, op="new", body=f"{tag}_body", name="Terminals")
        terminals.append(f"{tag}_body")
model.box("coat", L - 2 * MARGIN * W, W - 2 * B - 2 * MARGIN * W, METAL, at=(0, 0, T - METAL / 2), op="new", body="coat_body", name="Coating")
# Materials, for looks and a rough mass (the sheets: a thick film on "a high grade ceramic" body or substrate, "covered by a protective
# coating", terminals of tin on a nickel barrier): the body alumina, the coating ptfe (an epoxy-like layer, nearest density in the list),
# the terminals tin.
model.material("alumina", bodies=["body_body"], color="#e9e7e1")
model.material("ptfe", bodies=["coat_body"], color="#1d1d1f")
model.material("tin", bodies=terminals, color="#c9ccd1")
result = model.result()