// Renders the raster icons in public/ from their SVG sources with Inkscape.
//
// The browser tab uses public/favicon.svg directly, but Safari, the iOS home
// screen, Android's PWA install and push notifications all want PNGs, and
// those can't be transparent (iOS fills a transparent icon with black) or
// edge-to-edge (Android crops adaptive icons to a circle or squircle). So
// there are two sources: the bare mark for the 32px favicon, and the mark on
// the app's stage colour for everything else, sized to sit inside the
// maskable safe zone.
//
// Inkscape is used because it is already a fixture of the design workflow;
// rendering with it means no image library in node_modules. Its installer
// does not put it on PATH on Windows, so the standard install folders are
// tried after PATH and an explicit INKSCAPE environment variable.
//
// Usage: node scripts/make-icons.mjs
//        INKSCAPE="C:\path\to\inkscape.com" node scripts/make-icons.mjs

import { execFileSync } from 'node:child_process';
import { existsSync } from 'node:fs';
import { dirname, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

/** Every PNG the app ships, with the SVG it is rendered from. */
export const ICONS = [
  { source: 'public/favicon.svg', out: 'public/favicon-32.png', size: 32 },
  { source: 'scripts/icons/app-icon.svg', out: 'public/apple-touch-icon.png', size: 180 },
  { source: 'scripts/icons/app-icon.svg', out: 'public/icon-192.png', size: 192 },
  { source: 'scripts/icons/app-icon.svg', out: 'public/icon-512.png', size: 512 },
  { source: 'scripts/icons/app-icon-maskable.svg', out: 'public/icon-512-maskable.png', size: 512 },
];

/** Where Inkscape's installer puts the console binary when it is not on PATH. */
export const INKSCAPE_CANDIDATES = [
  'C:\\Program Files\\Inkscape\\bin\\inkscape.com',
  'C:\\Program Files (x86)\\Inkscape\\bin\\inkscape.com',
  '/Applications/Inkscape.app/Contents/MacOS/inkscape',
  '/usr/bin/inkscape',
  '/usr/local/bin/inkscape',
];

/**
 * The Inkscape binary to run: the INKSCAPE variable if set, otherwise the
 * first standard location that exists, otherwise the bare name and PATH.
 */
export function findInkscape(env = process.env, exists = existsSync) {
  if (env.INKSCAPE) return env.INKSCAPE;
  const found = INKSCAPE_CANDIDATES.find((p) => exists(p));
  return found ?? 'inkscape';
}

/** The Inkscape 1.x command line for one PNG. */
export function exportArgs({ source, out, size }) {
  return [
    source,
    '--export-type=png',
    `--export-filename=${out}`,
    `--export-width=${size}`,
    `--export-height=${size}`,
  ];
}

export function makeIcons(root, run = execFileSync) {
  const inkscape = findInkscape();
  for (const icon of ICONS) {
    const args = exportArgs({
      source: resolve(root, icon.source),
      out: resolve(root, icon.out),
      size: icon.size,
    });
    run(inkscape, args, { stdio: 'inherit' });
    console.log(`[icons] ${icon.out} (${icon.size}px) <- ${icon.source}`);
  }
}

if (process.argv[1] && resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
  const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
  makeIcons(root);
}