// Baut aus src/alt-text-checker.js ein einzeiliges "javascript:"-Bookmarklet
// und schreibt es nach dist/bookmarklet.txt sowie in INSTALLIEREN.html.
const fs = require('fs');
const path = require('path');
const { minify } = require('terser');

const SRC = path.join(__dirname, 'src', 'alt-text-checker.js');
const DIST_DIR = path.join(__dirname, 'dist');
const HTML_FILE = path.join(__dirname, 'INSTALLIEREN.html');

async function build() {
  const source = fs.readFileSync(SRC, 'utf8');

  const result = await minify(source, {
    compress: { unused: true, dead_code: true },
    mangle: true
  });

  if (result.error) throw result.error;

  const bookmarklet = 'javascript:' + encodeURIComponent(result.code);

  fs.mkdirSync(DIST_DIR, { recursive: true });
  fs.writeFileSync(path.join(DIST_DIR, 'alt-text-checker.min.js'), result.code, 'utf8');
  fs.writeFileSync(path.join(DIST_DIR, 'bookmarklet.txt'), bookmarklet, 'utf8');

  console.log(`Minified: ${source.length} -> ${result.code.length} bytes`);
  console.log(`Bookmarklet: ${bookmarklet.length} bytes`);

  if (fs.existsSync(HTML_FILE)) {
    let html = fs.readFileSync(HTML_FILE, 'utf8');
    const before = html;
    html = html.replace(
      /(<a id="bookmarklet-link"[^>]*href=")[^"]*(")/,
      `$1${bookmarklet.replace(/&/g, '&amp;').replace(/"/g, '&quot;')}$2`
    );
    if (html !== before) {
      fs.writeFileSync(HTML_FILE, html, 'utf8');
      console.log('INSTALLIEREN.html aktualisiert.');
    } else {
      console.log('Hinweis: Platzhalter <a id="bookmarklet-link"> nicht gefunden, INSTALLIEREN.html nicht verändert.');
    }
  }
}

build().catch((err) => {
  console.error(err);
  process.exit(1);
});