import { randomUUID } from 'node:crypto'

import type {
  BookingModeOption,
  BookingCapacitySettings,
  BookingInventorySummary,
  DinnerEvent,
  BookingMode,
  BookingStatus,
  PublicBookingConfig,
  PublicBooking,
  PublicBookingSeat,
  ReceiptBooking,
  TicketCatalogItem,
  TicketType
} from '~~/shared/booking'

import { calculateBookingInventorySummary, getBookingStatusLabel, isBookingStatus } from '~~/shared/booking'

import { randomToken, toIsoString } from './base64url'
import { ensureDatabaseReady } from './db-init'
import { getSqlClient } from './postgres'

type DbBookingRow = {
  id: string
  confirmation_token: string
  receipt_token: string
  event_id: string
  event_title: string
  event_date_label: string
  event_time_label: string
  event_venue: string
  customer_name: string
  customer_phone: string
  booking_mode_id: string | null
  booking_mode: string
  booking_mode_label: string | null
  booking_mode_seats_per_unit: number | string | null
  quantity: number | string
  seat_count: number | string
  ticket_type_id: string | null
  ticket_type: string
  ticket_label: string | null
  ticket_description: string | null
  unit_price: number | string
  total_price: number | string
  person_in_charge_id: string
  person_in_charge_name: string | null
  person_in_charge_phone_number: string | null
  remark?: string | null
  status: BookingStatus | string
  status_label: string | null
  created_at: Date | string
  confirmed_at: Date | string | null
}

type DbBookingSeatRow = {
  id: string
  seat_number: number | string
  seat_token: string
  recipient_name: string | null
  recipient_phone: string | null
  shared_at: Date | string | null
  created_at: Date | string
  updated_at: Date | string
}

type DbBookingSeatWithBookingRow = DbBookingSeatRow & Omit<DbBookingRow, 'id' | 'created_at'> & {
  booking_id: string
  booking_created_at: Date | string
}

type DbBookingSettingsRow = {
  event_id: string
  total_tables: number | string | null
  total_seats: number | string | null
  updated_at: Date | string
}

type DbDinnerEventRow = {
  id: string
  title: string
  date_label: string
  time_label: string
  venue: string
}

type DbBookingModeOptionRow = {
  id: string
  event_id: string
  code: string
  label: string
  quantity_label: string
  seats_per_unit: number | string
  sort_order: number | string
}

type DbTicketCatalogItemRow = {
  id: string
  event_id: string
  code: string
  label: string
  description: string
  price: number | string
  sort_order: number | string
}

export interface BookingModeOptionRecord extends BookingModeOption {
  eventId: string
}

export interface TicketCatalogItemRecord extends TicketCatalogItem {
  eventId: string
}

function bookingSelectColumns(sql: any) {
  return sql`
    bookings.id,
    bookings.confirmation_token,
    bookings.receipt_token,
    dinner_events.id as event_id,
    dinner_events.title as event_title,
    dinner_events.date_label as event_date_label,
    dinner_events.time_label as event_time_label,
    dinner_events.venue as event_venue,
    bookings.customer_name,
    bookings.customer_phone,
    bookings.booking_mode_id,
    coalesce(booking_modes.code, bookings.booking_mode) as booking_mode,
    booking_modes.label as booking_mode_label,
    booking_modes.seats_per_unit as booking_mode_seats_per_unit,
    bookings.quantity,
    bookings.seat_count,
    bookings.ticket_type_id,
    coalesce(ticket_types.code, bookings.ticket_type) as ticket_type,
    ticket_types.label as ticket_label,
    ticket_types.description as ticket_description,
    bookings.unit_price,
    bookings.total_price,
    bookings.person_in_charge_id,
    coalesce(users.full_name, bookings.person_in_charge_name) as person_in_charge_name,
    coalesce(users.phone_number, bookings.person_in_charge_phone_number) as person_in_charge_phone_number,
    bookings.remark,
    bookings.status,
    booking_statuses.label as status_label,
    bookings.created_at,
    bookings.confirmed_at
  `
}

function bookingJoins(sql: any) {
  return sql`
    inner join dinner_events on dinner_events.id = bookings.event_id
    left join booking_modes on booking_modes.id = bookings.booking_mode_id
    left join ticket_types on ticket_types.id = bookings.ticket_type_id
    left join users on users.id = bookings.person_in_charge_id
    left join booking_statuses on booking_statuses.code = bookings.status
  `
}

function parseInteger(value: number | string) {
  return typeof value === 'number' ? value : Number.parseInt(value, 10)
}

function mapDinnerEvent(row: DbDinnerEventRow): DinnerEvent {
  return {
    id: row.id,
    title: row.title,
    dateLabel: row.date_label,
    timeLabel: row.time_label,
    venue: row.venue
  }
}

function mapDinnerEventFromBooking(row: DbBookingRow | DbBookingSeatWithBookingRow): DinnerEvent {
  return {
    id: row.event_id,
    title: row.event_title,
    dateLabel: row.event_date_label,
    timeLabel: row.event_time_label,
    venue: row.event_venue
  }
}

function mapBookingModeOption(row: DbBookingModeOptionRow): BookingModeOptionRecord {
  return {
    id: row.id,
    eventId: row.event_id,
    value: row.code,
    label: row.label,
    quantityLabel: row.quantity_label,
    seatsPerUnit: parseInteger(row.seats_per_unit),
    sortOrder: parseInteger(row.sort_order)
  }
}

function mapTicketCatalogItem(row: DbTicketCatalogItemRow): TicketCatalogItemRecord {
  return {
    id: row.id,
    eventId: row.event_id,
    value: row.code,
    label: row.label,
    description: row.description,
    price: parseInteger(row.price),
    sortOrder: parseInteger(row.sort_order)
  }
}

function mapBooking(row: DbBookingRow): PublicBooking {
  const seatCount = parseInteger(row.seat_count)
  const status = isBookingStatus(row.status) ? row.status : 'pending'
  const ticketType = row.ticket_type
  const bookingMode = row.booking_mode

  return {
    id: row.id,
    confirmationToken: row.confirmation_token,
    receiptToken: row.receipt_token,
    event: mapDinnerEventFromBooking(row),
    customerName: row.customer_name,
    customerPhone: row.customer_phone,
    bookingModeId: row.booking_mode_id,
    bookingMode,
    bookingModeLabel: row.booking_mode_label || bookingMode,
    quantity: parseInteger(row.quantity),
    seatCount,
    ticketTypeId: row.ticket_type_id,
    ticketType,
    ticketLabel: row.ticket_label || ticketType.toUpperCase(),
    ticketDescription: row.ticket_description,
    unitPrice: parseInteger(row.unit_price),
    totalPrice: parseInteger(row.total_price),
    personInChargeId: row.person_in_charge_id,
    personInChargeName: row.person_in_charge_name || '',
    personInChargePhoneNumber: row.person_in_charge_phone_number || '',
    remark: row.remark || null,
    status,
    statusLabel: row.status_label || getBookingStatusLabel(status),
    createdAt: toIsoString(row.created_at) ?? new Date().toISOString(),
    confirmedAt: toIsoString(row.confirmed_at)
  }
}

function mapReceiptBooking(row: DbBookingRow | DbBookingSeatWithBookingRow): ReceiptBooking {
  const seatCount = parseInteger(row.seat_count)
  const status = isBookingStatus(row.status) ? row.status : 'pending'
  const ticketType = row.ticket_type
  const bookingMode = row.booking_mode

  return {
    id: row.id,
    receiptToken: row.receipt_token,
    event: mapDinnerEventFromBooking(row),
    customerName: row.customer_name,
    customerPhone: row.customer_phone,
    bookingModeId: row.booking_mode_id,
    bookingMode,
    bookingModeLabel: row.booking_mode_label || bookingMode,
    quantity: parseInteger(row.quantity),
    seatCount,
    ticketTypeId: row.ticket_type_id,
    ticketType,
    ticketLabel: row.ticket_label || ticketType.toUpperCase(),
    ticketDescription: row.ticket_description,
    unitPrice: parseInteger(row.unit_price),
    totalPrice: parseInteger(row.total_price),
    status,
    statusLabel: row.status_label || getBookingStatusLabel(status),
    createdAt: toIsoString('booking_created_at' in row ? row.booking_created_at : row.created_at) ?? new Date().toISOString(),
    confirmedAt: toIsoString(row.confirmed_at)
  }
}

function mapPublicBookingToReceiptBooking(booking: PublicBooking): ReceiptBooking {
  return {
    id: booking.id,
    receiptToken: booking.receiptToken,
    event: booking.event,
    customerName: booking.customerName,
    customerPhone: booking.customerPhone,
    bookingModeId: booking.bookingModeId,
    bookingMode: booking.bookingMode,
    bookingModeLabel: booking.bookingModeLabel,
    quantity: booking.quantity,
    seatCount: booking.seatCount,
    ticketTypeId: booking.ticketTypeId,
    ticketType: booking.ticketType,
    ticketLabel: booking.ticketLabel,
    ticketDescription: booking.ticketDescription,
    unitPrice: booking.unitPrice,
    totalPrice: booking.totalPrice,
    status: booking.status,
    statusLabel: booking.statusLabel,
    createdAt: booking.createdAt,
    confirmedAt: booking.confirmedAt
  }
}

function mapBookingSeat(row: DbBookingSeatRow): PublicBookingSeat {
  return {
    id: row.id,
    seatNumber: parseInteger(row.seat_number),
    seatToken: row.seat_token,
    recipientName: row.recipient_name,
    recipientPhone: row.recipient_phone,
    sharedAt: toIsoString(row.shared_at),
    createdAt: toIsoString(row.created_at) ?? new Date().toISOString(),
    updatedAt: toIsoString(row.updated_at) ?? new Date().toISOString()
  }
}

function mapBookingCapacitySettings(row: DbBookingSettingsRow | undefined): BookingCapacitySettings {
  if (!row) {
    return {
      totalSeats: null,
      updatedAt: null
    }
  }

  const totalSeats = row.total_seats === null ? null : parseInteger(row.total_seats)

  return {
    totalSeats,
    updatedAt: toIsoString(row.updated_at)
  }
}

export async function getPublicBookingConfig(): Promise<PublicBookingConfig> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [event] = await sql<DbDinnerEventRow[]>`
    select
      id,
      title,
      date_label,
      time_label,
      venue
    from dinner_events
    where is_active = true
    order by sort_order asc, created_at asc
    limit 1
  `

  if (!event) {
    throw new Error('No active dinner event is configured.')
  }

  const [bookingModes, ticketCatalog] = await Promise.all([
    sql<DbBookingModeOptionRow[]>`
      select
        id,
        event_id,
        code,
        label,
        quantity_label,
        seats_per_unit,
        sort_order
      from booking_modes
      where event_id = ${event.id}
        and is_active = true
      order by sort_order asc, label asc
    `,
    sql<DbTicketCatalogItemRow[]>`
      select
        id,
        event_id,
        code,
        label,
        description,
        price,
        sort_order
      from ticket_types
      where event_id = ${event.id}
        and is_active = true
      order by sort_order asc, label asc
    `
  ])

  return {
    event: mapDinnerEvent(event),
    bookingModes: bookingModes.map(mapBookingModeOption),
    ticketCatalog: ticketCatalog.map(mapTicketCatalogItem)
  }
}

export async function getActiveBookingModeOptionByCode(code: string): Promise<BookingModeOptionRecord | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingModeOptionRow[]>`
    select
      booking_modes.id,
      booking_modes.event_id,
      booking_modes.code,
      booking_modes.label,
      booking_modes.quantity_label,
      booking_modes.seats_per_unit,
      booking_modes.sort_order
    from booking_modes
    inner join dinner_events on dinner_events.id = booking_modes.event_id
    where dinner_events.is_active = true
      and booking_modes.is_active = true
      and booking_modes.code = ${code}
    order by booking_modes.sort_order asc
    limit 1
  `

  return row ? mapBookingModeOption(row) : null
}

export async function getActiveTicketCatalogItemByCode(code: string): Promise<TicketCatalogItemRecord | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbTicketCatalogItemRow[]>`
    select
      ticket_types.id,
      ticket_types.event_id,
      ticket_types.code,
      ticket_types.label,
      ticket_types.description,
      ticket_types.price,
      ticket_types.sort_order
    from ticket_types
    inner join dinner_events on dinner_events.id = ticket_types.event_id
    where dinner_events.is_active = true
      and ticket_types.is_active = true
      and ticket_types.code = ${code}
    order by ticket_types.sort_order asc
    limit 1
  `

  return row ? mapTicketCatalogItem(row) : null
}

async function insertBookingSeats(
  tx: ReturnType<typeof getSqlClient>,
  bookingId: string,
  seatCount: number
) {
  for (let seatNumber = 1; seatNumber <= seatCount; seatNumber += 1) {
    await tx`
      insert into booking_seats (
        id,
        booking_id,
        seat_number,
        seat_token
      )
      values (
        ${randomUUID()},
        ${bookingId},
        ${seatNumber},
        ${randomToken(24)}
      )
    `
  }
}

export async function createBooking(input: {
  eventId: string
  customerName: string
  customerPhone: string
  bookingModeId: string
  bookingMode: BookingMode
  quantity: number
  seatCount: number
  ticketTypeId: string
  ticketType: TicketType
  unitPrice: number
  totalPrice: number
  personInChargeId: string
}) {
  await ensureDatabaseReady()
  const sql = getSqlClient()
  const bookingId = randomUUID()
  const confirmationToken = randomToken(24)
  const receiptToken = randomToken(24)

  const row = await sql.begin(async (tx) => {
    const [createdBooking] = await tx<DbBookingRow[]>`
      with inserted_booking as (
      insert into bookings (
        id,
        confirmation_token,
        receipt_token,
        event_id,
        customer_name,
        customer_phone,
        booking_mode_id,
        booking_mode,
        quantity,
        seat_count,
        ticket_type_id,
        ticket_type,
        unit_price,
        total_price,
        person_in_charge_id,
        remark,
        status
      )
      values (
        ${bookingId},
        ${confirmationToken},
        ${receiptToken},
        ${input.eventId},
        ${input.customerName},
        ${input.customerPhone},
        ${input.bookingModeId},
        ${input.bookingMode},
        ${input.quantity},
        ${input.seatCount},
        ${input.ticketTypeId},
        ${input.ticketType},
        ${input.unitPrice},
        ${input.totalPrice},
        ${input.personInChargeId},
        null,
        'pending'
      )
      returning *
      )
      select ${bookingSelectColumns(tx)}
      from inserted_booking as bookings
      ${bookingJoins(tx)}
    `

    await insertBookingSeats(tx, bookingId, input.seatCount)

    return createdBooking
  })

  return {
    booking: mapBooking(row),
    confirmationToken,
    receiptToken
  }
}

export async function getBookingByConfirmationToken(confirmationToken: string): Promise<PublicBooking | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingRow[]>`
    select ${bookingSelectColumns(sql)}
    from bookings
    ${bookingJoins(sql)}
    where bookings.confirmation_token = ${confirmationToken}
    limit 1
  `

  return row ? mapBooking(row) : null
}

export async function getBookingByReceiptToken(receiptToken: string): Promise<PublicBooking | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingRow[]>`
    select ${bookingSelectColumns(sql)}
    from bookings
    ${bookingJoins(sql)}
    where bookings.receipt_token = ${receiptToken}
    limit 1
  `

  return row ? mapBooking(row) : null
}

export async function listBookings(options?: {
  personInChargeId?: string
}): Promise<PublicBooking[]> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const rows = options?.personInChargeId
    ? await sql<DbBookingRow[]>`
      select ${bookingSelectColumns(sql)}
      from bookings
      ${bookingJoins(sql)}
      where dinner_events.is_active = true
        and bookings.person_in_charge_id = ${options.personInChargeId}
      order by bookings.created_at desc
    `
    : await sql<DbBookingRow[]>`
      select ${bookingSelectColumns(sql)}
      from bookings
      ${bookingJoins(sql)}
      where dinner_events.is_active = true
      order by bookings.created_at desc
    `

  return rows.map(mapBooking)
}

export async function updateBookingRemark(input: {
  bookingId: string
  personInChargeId?: string
  remark: string | null
}): Promise<PublicBooking | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const rows = input.personInChargeId
    ? await sql<DbBookingRow[]>`
      with updated_booking as (
        update bookings
        set
          remark = ${input.remark},
          updated_at = now()
        where id = ${input.bookingId}
          and person_in_charge_id = ${input.personInChargeId}
        returning *
      )
      select ${bookingSelectColumns(sql)}
      from updated_booking as bookings
      ${bookingJoins(sql)}
      where dinner_events.is_active = true
      limit 1
    `
    : await sql<DbBookingRow[]>`
      with updated_booking as (
        update bookings
        set
          remark = ${input.remark},
          updated_at = now()
        where id = ${input.bookingId}
        returning *
      )
      select ${bookingSelectColumns(sql)}
      from updated_booking as bookings
      ${bookingJoins(sql)}
      where dinner_events.is_active = true
      limit 1
    `

  return rows[0] ? mapBooking(rows[0]) : null
}

export async function listBookingSeats(bookingId: string): Promise<PublicBookingSeat[]> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const rows = await sql<DbBookingSeatRow[]>`
    select
      id,
      seat_number,
      seat_token,
      recipient_name,
      recipient_phone,
      shared_at,
      created_at,
      updated_at
    from booking_seats
    where booking_id = ${bookingId}
    order by seat_number asc
  `

  return rows.map(mapBookingSeat)
}

export async function getBookingReceiptByReceiptToken(receiptToken: string): Promise<{
  booking: ReceiptBooking
  seats: PublicBookingSeat[]
} | null> {
  const booking = await getBookingByReceiptToken(receiptToken)

  if (!booking) {
    return null
  }

  const seats = await listBookingSeats(booking.id)

  return {
    booking: mapPublicBookingToReceiptBooking(booking),
    seats
  }
}

export async function getSeatReceiptBySeatToken(seatToken: string): Promise<{
  booking: ReceiptBooking
  seat: PublicBookingSeat
} | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingSeatWithBookingRow[]>`
    select
      booking_seats.id,
      booking_seats.seat_number,
      booking_seats.seat_token,
      booking_seats.recipient_name,
      booking_seats.recipient_phone,
      booking_seats.shared_at,
      booking_seats.created_at,
      booking_seats.updated_at,
      bookings.id as booking_id,
      bookings.confirmation_token,
      bookings.receipt_token,
      dinner_events.id as event_id,
      dinner_events.title as event_title,
      dinner_events.date_label as event_date_label,
      dinner_events.time_label as event_time_label,
      dinner_events.venue as event_venue,
      bookings.customer_name,
      bookings.customer_phone,
      bookings.booking_mode_id,
      coalesce(booking_modes.code, bookings.booking_mode) as booking_mode,
      booking_modes.label as booking_mode_label,
      booking_modes.seats_per_unit as booking_mode_seats_per_unit,
      bookings.quantity,
      bookings.seat_count,
      bookings.ticket_type_id,
      coalesce(ticket_types.code, bookings.ticket_type) as ticket_type,
      ticket_types.label as ticket_label,
      ticket_types.description as ticket_description,
      bookings.unit_price,
      bookings.total_price,
      bookings.person_in_charge_id,
      coalesce(users.full_name, bookings.person_in_charge_name) as person_in_charge_name,
      coalesce(users.phone_number, bookings.person_in_charge_phone_number) as person_in_charge_phone_number,
      bookings.status,
      booking_statuses.label as status_label,
      bookings.created_at as booking_created_at,
      bookings.confirmed_at
    from booking_seats
    inner join bookings on bookings.id = booking_seats.booking_id
    ${bookingJoins(sql)}
    where booking_seats.seat_token = ${seatToken}
    limit 1
  `

  if (!row) {
    return null
  }

  return {
    booking: mapReceiptBooking({
      ...row,
      id: row.booking_id
    }),
    seat: mapBookingSeat(row)
  }
}

export async function updateBookingSeatShareByReceiptToken(input: {
  receiptToken: string
  seatId: string
  shared: boolean
  recipientName: string | null
  recipientPhone: string | null
}): Promise<PublicBookingSeat | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()
  const nextSeatToken = input.shared ? null : randomToken(24)

  const [row] = await sql<DbBookingSeatRow[]>`
    update booking_seats
    set
      recipient_name = ${input.shared ? input.recipientName : null},
      recipient_phone = ${input.shared ? input.recipientPhone : null},
      shared_at = ${input.shared ? new Date() : null},
      seat_token = coalesce(${nextSeatToken}, seat_token),
      updated_at = now()
    from bookings
    where booking_seats.booking_id = bookings.id
      and bookings.receipt_token = ${input.receiptToken}
      and booking_seats.id = ${input.seatId}
    returning
      booking_seats.id,
      booking_seats.seat_number,
      booking_seats.seat_token,
      booking_seats.recipient_name,
      booking_seats.recipient_phone,
      booking_seats.shared_at,
      booking_seats.created_at,
      booking_seats.updated_at
  `

  return row ? mapBookingSeat(row) : null
}

export async function getBookingCapacitySettings(): Promise<BookingCapacitySettings> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingSettingsRow[]>`
    select
      booking_settings.event_id,
      total_tables,
      total_seats,
      booking_settings.updated_at
    from booking_settings
    inner join dinner_events on dinner_events.id = booking_settings.event_id
    where dinner_events.is_active = true
    order by dinner_events.sort_order asc
    limit 1
  `

  return mapBookingCapacitySettings(row)
}

export async function updateBookingCapacitySettings(input: {
  totalSeats: number | null
}): Promise<BookingCapacitySettings> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingSettingsRow[]>`
    update booking_settings
    set
      total_seats = ${input.totalSeats},
      updated_at = now()
    from dinner_events
    where booking_settings.event_id = dinner_events.id
      and dinner_events.is_active = true
    returning
      booking_settings.event_id,
      total_tables,
      total_seats,
      booking_settings.updated_at
  `

  return mapBookingCapacitySettings(row)
}

export async function getBookingInventorySummary(): Promise<BookingInventorySummary> {
  const [bookings, settings] = await Promise.all([
    listBookings(),
    getBookingCapacitySettings()
  ])

  return calculateBookingInventorySummary(bookings, settings)
}

export async function confirmBookingByConfirmationToken(confirmationToken: string): Promise<PublicBooking | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingRow[]>`
    with updated_booking as (
      update bookings
      set
        status = 'confirmed',
        confirmed_at = now(),
        updated_at = now()
      where confirmation_token = ${confirmationToken}
        and status = 'pending'
      returning *
    )
    select ${bookingSelectColumns(sql)}
    from updated_booking as bookings
    ${bookingJoins(sql)}
  `

  if (row) {
    return mapBooking(row)
  }

  return await getBookingByConfirmationToken(confirmationToken)
}

export async function cancelBookingConfirmationByConfirmationToken(confirmationToken: string): Promise<PublicBooking | null> {
  await ensureDatabaseReady()
  const sql = getSqlClient()

  const [row] = await sql<DbBookingRow[]>`
    with updated_booking as (
      update bookings
      set
        status = 'pending',
        confirmed_at = null,
        updated_at = now()
      where confirmation_token = ${confirmationToken}
        and status = 'confirmed'
      returning *
    )
    select ${bookingSelectColumns(sql)}
    from updated_booking as bookings
    ${bookingJoins(sql)}
  `

  if (row) {
    return mapBooking(row)
  }

  return await getBookingByConfirmationToken(confirmationToken)
}