import type { BookingDetails } from '@/domain/booking/entities';
import { isBookingComplete } from '@/domain/booking/validation';
import type { Language } from '@/domain/language/entities';
import {
  calculateOrderTotal,
  formatOrderLinesForMessage,
  type OrderLine,
} from '@/domain/shared/order-line';
import { PICKUP_LEAD_TIME_MINUTES } from '@/domain/shared/constants';

export interface CartDrawerCopy {
  messageHello: string;
  messageIntro: string;
  messageConfirm: string;
  messageTotal: string;
  messageThanks: string;
}

export interface BookingLocationCopy {
  askim: string;
  backaplan: string;
}

export function getSuggestedPickupTime(language: Language, from: Date = new Date()): string {
  const suggested = new Date(from.getTime() + PICKUP_LEAD_TIME_MINUTES * 60 * 1000);
  const timeLocale =
    language === 'sv' ? 'sv-SE' :
    language === 'ar' ? 'ar-SA' :
    language === 'tr' ? 'tr-TR' :
    'en-GB';
  return suggested.toLocaleTimeString(timeLocale, { hour: '2-digit', minute: '2-digit' });
}

export function buildCartWhatsAppMessage(
  items: OrderLine[],
  copy: CartDrawerCopy,
  language: Language
): string | null {
  if (items.length === 0) return null;

  const lines = formatOrderLinesForMessage(items);
  const total = calculateOrderTotal(items);
  const suggestedTime = getSuggestedPickupTime(language);

  return `${copy.messageHello}

${copy.messageIntro}

${lines}
${copy.messageConfirm.replace('{time}', suggestedTime)}

${copy.messageTotal}: ${total} kr

${copy.messageThanks}`;
}

export function buildBookingWhatsAppMessage(
  booking: BookingDetails,
  preOrder: OrderLine[],
  locationCopy: BookingLocationCopy
): string | null {
  if (!isBookingComplete(booking)) return null;

  const locationLabel =
    booking.location === 'askim' ? locationCopy.askim : locationCopy.backaplan;

  const itemsText =
    preOrder.length > 0
      ? formatOrderLinesForMessage(preOrder).replace(/  —  /g, ' — ')
      : 'None';

  const totalText =
    preOrder.length > 0 ? `\nPre-order total: ${calculateOrderTotal(preOrder)} kr\n` : '';

  return `Hello Shahi Kitchen 👋

Table Reservation Inquiry:

Name: ${booking.name}
Phone: ${booking.phone}
Email: ${booking.email || 'N/A'}
Location: ${locationLabel}
Date: ${booking.date}
Time: ${booking.time}
Guests: ${booking.guests}
Special Requests: ${booking.notes || 'None'}

Pre-ordered items:
${itemsText}${totalText}
Please confirm table availability and pre-order.

Thank you!`;
}