import { getCollection } from 'astro:content';

/**
 * The single entry of an app's privacy-policy collection.
 *
 * The Markdown lives in the app's own repository (see scripts/sync-external.mjs);
 * this site holds no copy. If the checkout is missing or empty the collection
 * resolves nothing, and a privacy page that renders nothing is worse than a
 * failed build — so this throws rather than returning undefined.
 */
export async function getPolicy(collection: 'calendulaPolicy' | 'agendulaPolicy') {
  const entries = await getCollection(collection);
  if (entries.length !== 1) {
    throw new Error(
      `[policy] ${collection} resolved ${entries.length} entries, expected exactly 1. ` +
        'The app repository under external/ is missing, empty, or holds more than ' +
        'one PRIVACY.md. Run `npm run sync:external` and read its output.'
    );
  }
  return entries[0];
}