#!/usr/bin/env python3
"""Report mean luminance / contrast of the level textures.

FLUX happily returns a near-white blank sheet for prompts like "pale grey
concrete", which renders as a blown-out void in game. Anything with a mean
much above ~200 or a range under ~30 is a dud worth re-prompting.

Usage: check_textures.py [name ...]
"""
import os
import sys
from PIL import Image

TEX = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "assets", "textures")
want = set(sys.argv[1:])
bad = 0
for f in sorted(os.listdir(TEX)):
    if not f.endswith(".jpg") or (want and f[:-4] not in want):
        continue
    px = list(Image.open(os.path.join(TEX, f)).convert("L").resize((48, 48)).getdata())
    mean, rng = sum(px) / len(px), max(px) - min(px)
    flag = "  <-- washed out" if mean > 205 else ("  <-- featureless" if rng < 8 else "")
    bad += bool(flag)
    print("%-22s mean %3.0f  range %3d%s" % (f[:-4], mean, rng, flag))
sys.exit(1 if bad else 0)