const VENDOR_CODE_REGEX = /^([A-Z]{4})-DSS-(\d{2})-(\d{3})$/;

function normalizeVendorCode(value) {
  return String(value || '').trim().toUpperCase();
}

function parseVendorCode(value) {
  const normalized = normalizeVendorCode(value);
  const match = normalized.match(VENDOR_CODE_REGEX);
  if (!match) {
    return null;
  }

  return {
    normalized,
    name4: match[1],
    year: match[2],
    sequence: match[3]
  };
}

module.exports = {
  VENDOR_CODE_REGEX,
  normalizeVendorCode,
  parseVendorCode
};