export interface BookingSummaryInput {
  bookingNumber: number;
  contactName: string;
  phone: string;
  objectNames: string[];
  date: Date;
  checkOutDate: Date | null;
  checkIn: string;
  checkOut: string;
  guestCount: number;
  cost: number;
  prepayment: number;
  discount: number;
  comment: string | null;
  source: string | null;
  bookedByName: string;
}

function formatDate(d: Date): string {
  const dd = String(d.getDate()).padStart(2, "0");
  const mm = String(d.getMonth() + 1).padStart(2, "0");
  return `${dd}.${mm}.${d.getFullYear()}`;
}

/**
 * Guest-facing confirmation text for the "Скопировать бронирование" button
 * — meant to be pasted straight to the client (WhatsApp/Telegram/SMS), so
 * it deliberately excludes internal-only fields (source, who booked it).
 * Field set and order match exactly what was asked for; a multi-day stay's
 * date line shows both days ("дд.мм.гггг - дд.мм.гггг").
 */
export function formatBookingSummary(b: BookingSummaryInput): string {
  const dateLine = b.checkOutDate ? `${formatDate(b.date)} - ${formatDate(b.checkOutDate)}` : formatDate(b.date);
  const lines = [
    `Ваше бронирование подтверждено! Номер бронирования: ${b.bookingNumber}`,
    `Гость: ${b.contactName}`,
    `Номер для связи: ${b.phone}`,
    `Объект бронирования: ${b.objectNames.join("/") || "—"}`,
    `Дата: ${dateLine}`,
    `Время заезда/выезда: ${b.checkIn} - ${b.checkOut}`,
    `Количество гостей: ${b.guestCount}`,
    `Стоимость бронирования: ${b.cost}`,
    `Предоплата: ${b.prepayment}`,
    `Дополнительные пожелания: ${b.comment?.trim() || "-"}`,
    `Скидка: ${b.discount}`,
  ];
  return lines.join("\n");
}