/**
 * The public origin of this site, used as Next's `metadataBase`.
 */
const DEVELOPMENT_FALLBACK = 'http://localhost:3000';

export function siteUrl(): URL {
  const configured = process.env['SITE_URL']?.trim();

  if (configured) {
    return new URL(configured);
  }

  if (process.env.NODE_ENV === 'production') {
    console.error('SITE_URL is not set — canonical and Open Graph URLs will point at localhost.');
  }

  return new URL(DEVELOPMENT_FALLBACK);
}