// services/voicePin/parseVmPinTarget.js

const STORE_RE = /^\d{2,4}$/;
const EXTENSION_RE = /^\d{5}$/;
const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/i;

/**
 * @param {string} raw
 * @returns {{ kind: 'email', email: string } | { kind: 'store', storeNum: string } | { kind: 'extension', extension: string } | null}
 */
export function parseVmPinTarget(raw) {
  const token = String(raw || '').trim();
  if (!token) return null;

  if (EMAIL_RE.test(token)) {
    return { kind: 'email', email: token.toLowerCase() };
  }
  if (STORE_RE.test(token)) {
    return { kind: 'store', storeNum: token };
  }
  if (EXTENSION_RE.test(token)) {
    return { kind: 'extension', extension: token };
  }
  return null;
}