import type { AppLocale } from './i18n'

export type BookingMode = string
export type TicketType = string
export type BookingStatus = 'pending' | 'confirmed'
export type PaymentMethod = 'cash' | 'bank'

export interface DinnerEvent {
  id: string
  title: string
  dateLabel: string
  timeLabel: string
  venue: string
}

export interface BookingModeOption {
  id: string
  value: BookingMode
  label: string
  quantityLabel: string
  seatsPerUnit: number
  sortOrder: number
}

export interface TicketCatalogItem {
  id: string
  value: TicketType
  label: string
  description: string
  price: number
  sortOrder: number
}

export interface PublicBookingConfig {
  event: DinnerEvent
  bookingModes: BookingModeOption[]
  ticketCatalog: TicketCatalogItem[]
}

export interface PublicBooking {
  id: string
  confirmationToken: string
  receiptToken: string
  event: DinnerEvent
  customerName: string
  customerPhone: string
  locale: AppLocale
  bookingModeId: string | null
  bookingMode: BookingMode
  bookingModeLabel: string
  quantity: number
  seatCount: number
  ticketTypeId: string | null
  ticketType: TicketType
  ticketLabel: string
  ticketDescription: string | null
  unitPrice: number
  totalPrice: number
  personInChargeId: string
  personInChargeName: string
  personInChargePhoneNumber: string
  paymentMethod: PaymentMethod
  transactionDocument: BookingTransactionDocument | null
  remark: string | null
  status: BookingStatus
  statusLabel: string
  createdAt: string
  confirmedAt: string | null
}

export interface BookingTransactionDocument {
  originalName: string
  mimeType: string
  size: number
  uploadedAt: string
  url: string
}

export interface ReceiptBooking {
  id: string
  receiptToken: string
  event: DinnerEvent
  customerName: string
  customerPhone: string
  locale: AppLocale
  bookingModeId: string | null
  bookingMode: BookingMode
  bookingModeLabel: string
  quantity: number
  seatCount: number
  ticketTypeId: string | null
  ticketType: TicketType
  ticketLabel: string
  ticketDescription: string | null
  unitPrice: number
  totalPrice: number
  status: BookingStatus
  statusLabel: string
  createdAt: string
  confirmedAt: string | null
}

export interface PublicBookingSeat {
  id: string
  seatNumber: number
  seatToken: string
  recipientName: string | null
  recipientPhone: string | null
  sharedAt: string | null
  createdAt: string
  updatedAt: string
}

export interface PublicBookingSeatWithUrl extends PublicBookingSeat {
  seatUrl: string
}

export interface PublicBookingReceipt {
  booking: ReceiptBooking
  receiptUrl: string
  seats: PublicBookingSeatWithUrl[]
}

export interface PublicSeatReceipt {
  booking: ReceiptBooking
  seat: PublicBookingSeatWithUrl
  receiptUrl: string
}

export interface BookingCapacitySettings {
  totalSeats: number | null
  updatedAt: string | null
}

export interface BookingInventorySummary {
  totalSeats: number | null
  soldSeats: number
  pendingSeats: number
  leftSeats: number | null
}

export interface CreateBookingResponse {
  booking: PublicBooking
  confirmationUrl: string
  whatsappUrl: string
}

export interface WhatsAppDeliveryResult {
  sent: boolean
  skipped: boolean
  recipientPhone: string
  apiRecipientPhone: string
  messageId?: string
  error?: string
}

export interface ConfirmBookingResponse {
  booking: PublicBooking
  alreadyConfirmed: boolean
  ticketReceiptWhatsApp: WhatsAppDeliveryResult
}

export interface CancelBookingConfirmationResponse {
  booking: PublicBooking
  alreadyPending: boolean
}

export interface TransferBookingPicResponse {
  booking: PublicBooking
}

export interface UpdateBookingDetailsResponse {
  booking: PublicBooking
}

export interface DeleteBookingResponse {
  booking: PublicBooking
}

export function isBookingStatus(value: string | null | undefined): value is BookingStatus {
  return value === 'pending' || value === 'confirmed'
}

export function isPaymentMethod(value: string | null | undefined): value is PaymentMethod {
  return value === 'cash' || value === 'bank'
}

export function getBookingStatusLabel(value: BookingStatus | string, label?: string | null, locale: AppLocale = 'en') {
  if (label && locale !== 'zh') {
    return label
  }

  if (locale === 'zh') {
    return value === 'confirmed' ? '已确认' : '等待负责人确认'
  }

  return value === 'confirmed' ? 'Confirmed' : 'Pending PIC confirmation'
}

export function getSeatCount(bookingMode: Pick<BookingModeOption, 'seatsPerUnit'> | null | undefined, quantity: number) {
  return quantity * (bookingMode?.seatsPerUnit ?? 1)
}

export function getTicketLabel(ticket: Pick<TicketCatalogItem, 'label'> | null | undefined, ticketType: TicketType) {
  return ticket?.label || ticketType.toUpperCase()
}

export function getBookingTicketLabel(booking: Pick<PublicBooking | ReceiptBooking, 'ticketLabel' | 'ticketType'>) {
  return booking.ticketLabel || booking.ticketType.toUpperCase()
}

export function formatBookingCurrency(value: number, locale: AppLocale = 'en') {
  return new Intl.NumberFormat(locale === 'zh' ? 'zh-MY' : 'en-MY', {
    style: 'currency',
    currency: 'MYR',
    minimumFractionDigits: 0,
    maximumFractionDigits: 0
  }).format(value)
}

export function getSeatLabel(seatNumber: number, locale: AppLocale = 'en') {
  return locale === 'zh' ? `座位 ${seatNumber}` : `Seat ${seatNumber}`
}

export function calculateBookingInventorySummary(
  bookings: Pick<PublicBooking, 'seatCount' | 'status'>[],
  settings: BookingCapacitySettings
): BookingInventorySummary {
  const soldSeats = bookings
    .filter((booking) => booking.status === 'confirmed')
    .reduce((total, booking) => total + booking.seatCount, 0)

  const pendingSeats = bookings
    .filter((booking) => booking.status === 'pending')
    .reduce((total, booking) => total + booking.seatCount, 0)

  const leftSeats = settings.totalSeats === null ? null : Math.max(settings.totalSeats - soldSeats, 0)

  return {
    totalSeats: settings.totalSeats,
    soldSeats,
    pendingSeats,
    leftSeats
  }
}