/** Default values when greeting template variables are missing (web embed, WhatsApp, etc.). */
const CONCIERGE_GREETING_DEFAULTS = {
  profileName: 'Visitor',
  eventName: 'Event',
};

/**
 * Replace {profileName}, {eventName}, and other known placeholders in a concierge greeting.
 * Empty or missing values fall back to CONCIERGE_GREETING_DEFAULTS.
 *
 * @param {string} template
 * @param {{ profileName?: string, eventName?: string }} [values]
 * @returns {string}
 */
function interpolateConciergeGreeting(template, values = {}) {
  let out = String(template || '');
  for (const [key, fallback] of Object.entries(CONCIERGE_GREETING_DEFAULTS)) {
    const raw = values[key];
    const val =
      raw != null && String(raw).trim() !== '' ? String(raw).trim() : fallback;
    out = out.replace(new RegExp(`\\{${key}\\}`, 'gi'), val);
  }
  return out;
}

module.exports = {
  CONCIERGE_GREETING_DEFAULTS,
  interpolateConciergeGreeting,
};