"""Convert supplied glossiness data to roughness; configure GPU-ready imports."""
from pathlib import Path
from PIL import Image, ImageOps
import re

ROOT = Path(__file__).resolve().parents[1]
DIRECTORY = ROOT / 'assets/textures/operators'
for source in DIRECTORY.glob('*_Glossiness.png'):
    destination = source.with_name(source.name.replace('_Glossiness', '_Roughness'))
    if not destination.exists():
        # Linear data channel conversion: roughness = 1 - glossiness, no gamma.
        with Image.open(source) as image:
            ImageOps.invert(image.getchannel('R') if 'R' in image.getbands() else image.convert('L')).save(destination)
for source in DIRECTORY.glob('*.png'):
    metadata = source.with_suffix('.png.import')
    if not metadata.exists():
        continue  # Run again after Godot creates the first import record.
    content = metadata.read_text(encoding='utf-8')
    params = {'compress/mode': '2', 'mipmaps/generate': 'true',
              'compress/normal_map': '1' if '_Normal' in source.name else '2',
              'process/hdr_as_srgb': 'false', 'process/size_limit': '4096'}
    for key, value in params.items():
        content = re.sub(r'^' + re.escape(key) + r'=.*$', key + '=' + value, content, flags=re.M)
    metadata.write_text(content, encoding='utf-8')
print('Operator texture maps ready')