const getOrderItemNames = (invitation) => {
  const rawItems = Array.isArray(invitation?.orderItems)
    ? invitation.orderItems
    : Array.isArray(invitation?.items)
      ? invitation.items
      : [];

  return rawItems
    .map((item) => {
      if (typeof item === "string") {
        return item.trim();
      }

      if (item && typeof item === "object" && typeof item.name === "string") {
        return item.name.trim();
      }

      return "";
    })
    .filter(Boolean);
};

export const getInvitationReferenceLabel = (invitation) => {
  const invoiceNumbers = [...new Set(getOrderItemNames(invitation))];
  if (invoiceNumbers.length === 1) {
    return `Счет ${invoiceNumbers[0]}`;
  }

  if (invoiceNumbers.length > 1) {
    return `Счета: ${invoiceNumbers.join(", ")}`;
  }

  const orderNumber = typeof invitation?.orderNumber === "string" ? invitation.orderNumber.trim() : "";
  if (orderNumber) {
    return `Счет ${orderNumber}`;
  }

  return "Счет —";
};