"""Textures for the jack-o'-lantern (Tidewater fire pit, carved live on stream 2026-10-10). hear-venv python.
skin.png: pumpkin skin for an SL sphere (u wraps around, v pole to pole): 10 ribs, darker grooves, a little
mottling, darker near the poles. 512x256.
face.png: the carved face as an alpha mask for a second, slightly larger sphere: triangle eyes, a triangle
nose, a jagged grin. Opaque warm yellow where carved, transparent elsewhere; centred at u=0.5, v=0.5 (so the
offset decides which way it looks). 512x256, RGBA.
Claude Opus 5.5 (Tessel)."""
from pathlib import Path

import numpy as np
from PIL import Image, ImageDraw, ImageFilter

HERE = Path(__file__).parent
W, H = 512, 256
rng = np.random.default_rng(31)

u = np.linspace(0, 1, W, endpoint=False)[None, :]
v = np.linspace(0, 1, H)[:, None]
ribs = 0.5 + 0.5 * np.cos(u * 2 * np.pi * 10)            # 1 on the rib crowns, 0 in the grooves
groove = np.clip(1 - ribs, 0, 1) ** 6                      # thin dark grooves
pole = np.abs(v - 0.5) * 2                                 # 0 at the equator, 1 at the poles
noise = np.asarray(Image.fromarray((rng.random((H // 8, W // 8)) * 255).astype(np.uint8))
                   .resize((W, H), Image.BICUBIC), np.float32) / 255
shade = 0.78 + 0.22 * ribs ** 0.6 - 0.45 * groove - 0.25 * pole ** 3 + 0.08 * (noise - 0.5)
base = np.array([232, 118, 26], np.float32)               # pumpkin orange
dark = np.array([150, 62, 10], np.float32)
col = dark + (base - dark) * np.clip(shade, 0, 1)[..., None]
Image.fromarray(np.clip(col, 0, 255).astype(np.uint8)).save(HERE / "skin.png")

# Face: drawn in a box around the centre. On a sphere u spans 360 degrees, so the face's width in u is small.
S = 4                                                      # supersample for smooth edges
img = Image.new("L", (W * S, H * S), 0)
d = ImageDraw.Draw(img)


def P(pu, pv):
    return (pu * W * S, pv * H * S)


cu, cv = 0.5, 0.5
for side in (-1, 1):                                       # eyes: triangles pointing up
    ex = cu + side * 0.055
    d.polygon([P(ex - 0.035, cv - 0.06), P(ex + 0.035, cv - 0.06), P(ex, cv - 0.20)], fill=255)
d.polygon([P(cu - 0.018, cv + 0.02), P(cu + 0.018, cv + 0.02), P(cu, cv - 0.05)], fill=255)   # nose
grin = [P(cu - 0.11, cv + 0.06)]                           # jagged grin: top edge with two teeth
for x, y in ((-0.07, 0.10), (-0.05, 0.08), (-0.03, 0.10), (0.03, 0.10), (0.05, 0.08), (0.07, 0.10)):
    grin.append(P(cu + x, cv + y))
grin += [P(cu + 0.11, cv + 0.06), P(cu + 0.08, cv + 0.17), P(cu + 0.02, cv + 0.19), P(cu, cv + 0.16),
         P(cu - 0.02, cv + 0.19), P(cu - 0.08, cv + 0.17)]
d.polygon(grin, fill=255)
mask = img.resize((W, H), Image.LANCZOS).filter(ImageFilter.GaussianBlur(0.6))
a = np.asarray(mask, np.float32) / 255
glow = np.zeros((H, W, 4), np.uint8)
glow[..., 0], glow[..., 1], glow[..., 2] = 255, 196, 70    # candle yellow
glow[..., 3] = (a * 255).astype(np.uint8)
Image.fromarray(glow, "RGBA").save(HERE / "face.png")
print(HERE / "skin.png", HERE / "face.png")