"""Work-Death Balance icon: the existing nerd-zombie face in an amber badge.

Called by make_boot_splash.py with the already keyed full-resolution mascot, so
there is no second keying pass or new AI artwork. Reference coordinates are for
our original 1024x1024 mascot (not a generic automatic face detector).
"""
import hashlib
from pathlib import Path
from PIL import Image, ImageChops, ImageDraw


def build_favicon(mascot: Image.Image, root: Path) -> dict:
    assert mascot.size == (1024, 1024), 'Update the head mask for a different source'
    face = mascot.convert('RGBA').copy()
    mask = Image.new('L', face.size)
    ImageDraw.Draw(mask).polygon([
        (235, 240), (280, 195), (320, 110), (512, 80), (700, 140),
        (780, 245), (770, 385), (748, 460), (694, 610), (640, 710),
        (530, 755), (420, 735), (328, 650), (277, 520), (228, 395),
    ], fill=255)
    face.putalpha(ImageChops.multiply(face.getchannel('A'), mask))
    face = face.crop((220, 80, 790, 755))
    face.thumbnail((440, 460), Image.Resampling.LANCZOS)
    icon = Image.new('RGBA', (512, 512))
    ImageDraw.Draw(icon).rounded_rectangle((7, 7, 504, 504), radius=96,
                                          fill=(13, 16, 15, 255),
                                          outline=(255, 186, 48, 255), width=14)
    icon.alpha_composite(face, ((512 - face.width) // 2, (512 - face.height) // 2))
    output = root / 'assets/branding/work_death_icon.png'
    icon.save(output, optimize=True)
    preview = root / 'tools/branding/favicon_preview_32.png'
    icon.resize((32, 32), Image.Resampling.LANCZOS).save(preview, optimize=True)
    return {'file': str(output.relative_to(root)), 'size': [512, 512],
            'sha256': hashlib.sha256(output.read_bytes()).hexdigest(),
            'method': 'existing chroma-keyed mascot head, dark rounded badge, amber outline; Pillow',
            'preview': str(preview.relative_to(root))}