#!/usr/bin/env python3
"""Create a favicon.ico from an existing PNG asset.

Usage: python tools/create_favicon.py

Produces: ./favicon.ico

The script will try to import Pillow. If it's not available, it prints instructions.
"""
import os
import sys

ROOT = os.path.dirname(os.path.dirname(__file__))
SRC = os.path.join(ROOT, 'assets', 'BMP_WEWIN.png')
# fallback to assets/Rat/BMP_WEWIN.png if present
if not os.path.exists(SRC):
    alt = os.path.join(ROOT, 'assets', 'Rat', 'BMP_WEWIN.png')
    if os.path.exists(alt):
        SRC = alt
OUT = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'favicon.ico')


def ensure_pillow():
    try:
        from PIL import Image
        return Image
    except Exception:
        print('Pillow (PIL) is required to run this script. Install with:')
        print('  pip install Pillow')
        return None


def create_favicon():
    Image = ensure_pillow()
    if Image is None:
        return 2

    if not os.path.exists(SRC):
        print(f'Source PNG not found: {SRC}')
        return 1

    try:
        img = Image.open(SRC)
        # Create multiple sizes for favicon
        sizes = [(16, 16), (32, 32), (48, 48), (64, 64)]
        icons = [img.resize(s, Image.Resampling.LANCZOS) if hasattr(Image, 'Resampling') else img.resize(s) for s in sizes]
        # Save as ICO
        icons[0].save(OUT, format='ICO', sizes=sizes)
        print(f'Created favicon: {OUT}')
        return 0
    except Exception as e:
        print('Failed to create favicon:', e)
        return 3


if __name__ == '__main__':
    sys.exit(create_favicon())