#!/usr/bin/env python3
"""Generates the base Tauri icon from the official project logo.

The official logo is `logo.png` in the repository root (RGBA, transparent
background, suitable for both light and dark themes). It is not modified here.
Output:
  apps/gui/src-tauri/icons/source.png   1024 px artwork centered over a rounded
                                        dark background; CI and `npx @tauri-apps/cli icon`
                                        derive all remaining icon formats from it.

Usage: python3 scripts/generate-logo.py
"""
import os
from PIL import Image, ImageDraw

ROOT = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..")
ICONS_DIR = os.path.join(ROOT, "apps/gui/src-tauri/icons")
ICON_BG = (10, 16, 28)  # dark navy background matching the original artwork


def crop_square(im, margin=0.04):
    """Crops to visible pixels (opacity > 16, ignoring faint artifacts) and centers in a square."""
    box = im.getchannel("A").point(lambda v: 255 if v > 16 else 0).getbbox()
    im = im.crop(box)
    w, h = im.size
    side = round(max(w, h) * (1 + 2 * margin))
    canvas = Image.new("RGBA", (side, side), (0, 0, 0, 0))
    canvas.paste(im, ((side - w) // 2, (side - h) // 2), im)
    return canvas


def main():
    logo = crop_square(Image.open(os.path.join(ROOT, "logo.png")).convert("RGBA"))

    side = 1024
    bg = Image.new("RGBA", (side, side), ICON_BG + (255,))
    art = logo.resize((round(side * 0.82),) * 2, Image.LANCZOS)
    bg.paste(art, ((side - art.width) // 2, (side - art.height) // 2), art)
    mask = Image.new("L", (side, side), 0)
    ImageDraw.Draw(mask).rounded_rectangle((0, 0, side - 1, side - 1), radius=round(side * 0.2237), fill=255)
    icon = Image.new("RGBA", (side, side), (0, 0, 0, 0))
    icon.paste(bg, (0, 0), mask)
    os.makedirs(ICONS_DIR, exist_ok=True)
    dest = os.path.join(ICONS_DIR, "source.png")
    icon.save(dest, optimize=True)
    os.chmod(dest, 0o644)
    print("icons/source.png")


if __name__ == "__main__":
    main()