"""Generate tonal + complement scales for Lumotia v0.3 quietware tokens.

Each scale has 11 steps: 50, 100, 200, ..., 900, 950. Lightness curve
is hand-picked to mimic the OKLCH-style tonal scales used by Material 3
and IBM Carbon. Saturation drops at extremes to avoid neon flat tints
and washed-out highs.

Output is CSS variable declarations written to stdout.
"""
import colorsys

# (name, hex, saturation_at_500)
SOURCES = [
    ("red",                   "#FF0700"),
    ("blue",                  "#000AFF"),
    ("green",                 "#00FF56"),
    ("yellow",                "#FFCD00"),
    ("orange",                "#F0620A"),
    ("red-complement",        "#00F8FF"),
    ("blue-complement",       "#FFF500"),
    ("green-complement",      "#FF00A9"),
    ("yellow-complement",     "#0032FF"),
    ("orange-complement",     "#0A98F0"),
]

# Lightness + saturation curves per shade step.
STEPS = [
    # step,  L,   S-factor (multiplied by source S)
    ( "50",  0.97, 0.30),
    ("100",  0.93, 0.50),
    ("200",  0.86, 0.70),
    ("300",  0.76, 0.85),
    ("400",  0.65, 0.95),
    ("500",  0.52, 1.00),
    ("600",  0.45, 1.00),
    ("700",  0.36, 0.95),
    ("800",  0.27, 0.90),
    ("900",  0.18, 0.80),
    ("950",  0.11, 0.70),
]


def hex_to_hls(h):
    h = h.lstrip("#")
    r, g, b = tuple(int(h[i:i+2], 16) / 255 for i in (0, 2, 4))
    return colorsys.rgb_to_hls(r, g, b)


def hls_to_hex(h, l, s):
    r, g, b = colorsys.hls_to_rgb(h, l, s)
    return "#{:02X}{:02X}{:02X}".format(*(max(0, min(255, round(c * 255))) for c in (r, g, b)))


for name, src_hex in SOURCES:
    h, _l_src, s_src = hex_to_hls(src_hex)
    print(f"  /* {name} — source {src_hex} */")
    for step, l, s_factor in STEPS:
        s = max(0.0, min(1.0, s_src * s_factor))
        print(f"  --{name}-{step}: {hls_to_hex(h, l, s)};")
    print()