/**
 * SEO artefacts — sitemap and robots.
 *
 * sitemap.xml enumerates every crawlable URL. The snapshot writes it to the
 * bucket root; the live service serves the same file on request so a crawler
 * hitting prometheus.x (via the apps.silentmode.st mirror in production) sees
 * the same contents the snapshot does.
 *
 * robots.txt is the usual shape: allow everything except the admin and the
 * raw API routes, which have no public content.
 */

const BASE = process.env.PUBLIC_BASE || 'https://prometheus.x';

/**
 * @param {{categories: string[], listings: Array<{publisher: string, slug: string, lastmod?: string}>}} data
 */
export function renderSitemap({ categories, listings }) {
  const now = new Date().toISOString();
  const urls = [
    { loc: '/',           lastmod: now, priority: '1.0' },
    { loc: '/browse',     lastmod: now, priority: '0.9' },
    { loc: '/publish',    lastmod: now, priority: '0.6' },
    { loc: '/boundaries', lastmod: now, priority: '0.5' },
    { loc: '/submit',     lastmod: now, priority: '0.4' },
    ...categories.map((slug) => ({
      loc: `/c/${slug}`, lastmod: now, priority: '0.7',
    })),
    ...listings.map((l) => ({
      loc: `/app/${l.publisher}/${l.slug}`,
      lastmod: l.lastmod || now,
      priority: '0.8',
    })),
  ];

  const body = urls.map((u) =>
    `  <url><loc>${BASE}${u.loc}</loc><lastmod>${u.lastmod}</lastmod><priority>${u.priority}</priority></url>`
  ).join('\n');

  return `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${body}
</urlset>
`;
}

export function renderRobots() {
  return `User-agent: *
Allow: /
Disallow: /admin
Disallow: /admin/
Disallow: /api/
Disallow: /.well-known/

Sitemap: ${BASE}/sitemap.xml
`;
}

/**
 * schema.org JSON-LD for a listing — Google renders a rich card for apps.
 * Returns the raw JSON string; the template wraps it in a <script> tag.
 */
export function softwareApplicationLd({ listing, scanVerdict }) {
  const payload = {
    '@context': 'https://schema.org',
    '@type': 'SoftwareApplication',
    name: listing.name,
    description: listing.description,
    softwareVersion: listing.version,
    applicationCategory: humanCategory(listing.category),
    url: `${BASE}/app/${listing.publisher}/${listing.slug}`,
    downloadUrl: listing.download_url,
    fileSize: `${listing.download_size} B`,
    offers: { '@type': 'Offer', price: '0', priceCurrency: 'USD' },
    author: {
      '@type': 'Organization',
      name: listing.publisher,
    },
  };
  if (listing.icon) payload.image = listing.icon;
  if (scanVerdict === 'clean') {
    payload.contentRating = 'ClamAV clean';
  }
  return JSON.stringify(payload);
}

function humanCategory(slug) {
  const map = {
    communication: 'CommunicationApplication',
    privacy: 'SecurityApplication',
    wallets: 'FinanceApplication',
    games: 'GameApplication',
    devtools: 'DeveloperApplication',
    media: 'MultimediaApplication',
    utilities: 'UtilitiesApplication',
    other: 'ApplicationSuite',
  };
  return map[slug] || 'ApplicationSuite';
}