"""Downscale launcher icon PNGs from mipmap-xxxhdpi masters to lower densities."""
from __future__ import annotations

from pathlib import Path

from PIL import Image

ROOT = Path(__file__).resolve().parents[1]
RES = ROOT / "app" / "src" / "main" / "res"
SOURCE_FOLDER = "mipmap-xxxhdpi"

SOURCES = {
    "ic_launcher.png": {
        "mipmap-xxxhdpi": 192,
        "mipmap-xxhdpi": 144,
        "mipmap-xhdpi": 96,
        "mipmap-hdpi": 72,
        "mipmap-mdpi": 48,
    },
    "ic_launcher_foreground.png": {
        "mipmap-xxxhdpi": 432,
        "mipmap-xxhdpi": 324,
        "mipmap-xhdpi": 216,
        "mipmap-hdpi": 162,
        "mipmap-mdpi": 108,
    },
}


def main() -> None:
    for filename, sizes in SOURCES.items():
        source_path = RES / SOURCE_FOLDER / filename
        source = Image.open(source_path)
        expected = sizes[SOURCE_FOLDER]
        if source.size != (expected, expected):
            raise RuntimeError(
                f"{source_path} is {source.size[0]}x{source.size[1]}, expected {expected}x{expected}"
            )

        for folder, size in sizes.items():
            if folder == SOURCE_FOLDER:
                continue
            out_dir = RES / folder
            out_dir.mkdir(parents=True, exist_ok=True)
            resized = source.resize((size, size), Image.Resampling.LANCZOS)
            resized.save(out_dir / filename)
            print(f"Wrote {folder}/{filename} ({size}x{size})")

    print("Done.")


if __name__ == "__main__":
    main()