#!/usr/bin/env python3
"""Generate FlowDeck PWA icons as PNG (72→512 px) from the favicon design.

Draws the same logo as static/favicon.svg (blue rounded square + white "FD")
at every size required by the web manifest. No cairosvg dependency required —
pure Pillow.
"""
from __future__ import annotations

from pathlib import Path

from PIL import Image, ImageDraw, ImageFont

ICON_BLUE = "#2383E2"
ICON_WHITE = "#FFFFFF"
SIZES = [72, 96, 128, 144, 152, 192, 384, 512]
OUT_DIR = Path(__file__).resolve().parent.parent / "static" / "icons"


def _font_at(px: int) -> ImageFont.FreeTypeFont | ImageFont.ImageFont:
    """Pick the best available bold font for the requested icon size."""
    candidates = [
        "C:/Windows/Fonts/arialbd.ttf",
        "C:/Windows/Fonts/Arialbd.ttf",
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",
        "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf",
    ]
    for path in candidates:
        if Path(path).exists():
            try:
                return ImageFont.truetype(path, size=int(px * 0.42))
            except OSError:
                continue
    return ImageFont.load_default()


def draw_icon(size: int) -> Image.Image:
    """Render the FlowDeck rounded-square logo at `size` x `size` px."""
    radius = max(2, round(size * 0.1875))  # rx=6 on a 32 viewBox → ~18.75%
    img = Image.new("RGB", (size, size), ICON_BLUE)
    draw = ImageDraw.Draw(img)
    draw.rounded_rectangle([0, 0, size - 1, size - 1], radius=radius, fill=ICON_BLUE)
    font = _font_at(size)
    bbox = draw.textbbox((0, 0), "FD", font=font)
    tw, th = bbox[2] - bbox[0], bbox[3] - bbox[1]
    draw.text(
        ((size - tw) / 2 - bbox[0], (size - th) / 2 - bbox[1]),
        "FD",
        font=font,
        fill=ICON_WHITE,
    )
    return img


def main() -> None:
    OUT_DIR.mkdir(parents=True, exist_ok=True)
    for size in SIZES:
        path = OUT_DIR / f"icon-{size}x{size}.png"
        draw_icon(size).save(path, "PNG", optimize=True)
        print(f"Generated {path}")

    # Apple touch icon: standalone 180 px (not part of the manifest set).
    apple = OUT_DIR / "apple-touch-icon.png"
    draw_icon(180).save(apple, "PNG", optimize=True)
    print(f"Generated {apple}")


if __name__ == "__main__":
    main()