import sys
from pathlib import Path

from PIL import Image, ImageDraw


def build(path: Path, size: int) -> None:
    # The fnOS mobile launcher already applies its own icon mask. Transparent
    # corners are composited against black in the app, so keep the full canvas
    # opaque and let the branded background run all the way to every edge.
    image = Image.new("RGBA", (size, size), (103, 145, 244, 255))
    draw = ImageDraw.Draw(image)
    center = size // 2
    radius = size // 5
    draw.ellipse(
        (center - radius, center - radius, center + radius, center + radius),
        outline=(255, 255, 255, 245),
        width=max(2, size // 25),
    )
    sparkle = size // 13
    draw.polygon(
        [
            (size * 3 // 4, size // 5),
            (size * 3 // 4 + sparkle, size // 3),
            (size * 7 // 8, size // 3 + sparkle),
            (size * 3 // 4 + sparkle, size // 3 + sparkle * 2),
            (size * 3 // 4, size // 2),
            (size * 3 // 4 - sparkle, size // 3 + sparkle * 2),
            (size * 5 // 8, size // 3 + sparkle),
            (size * 3 // 4 - sparkle, size // 3),
        ],
        fill=(255, 255, 255, 255),
    )
    image.save(path, "PNG")


if __name__ == "__main__":
    destination = Path(sys.argv[1])
    destination.mkdir(parents=True, exist_ok=True)
    build(destination / "ICON.PNG", 128)
    build(destination / "ICON_256.PNG", 256)
    ui_images = destination / "app" / "ui" / "images"
    ui_images.mkdir(parents=True, exist_ok=True)
    build(ui_images / "icon_64.png", 64)
    build(ui_images / "icon_256.png", 256)