import { randomUUID } from 'node:crypto'

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

import { calculateBookingInventorySummary, isBookingMode, 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
  customer_name: string
  customer_phone: string
  booking_mode: string
  quantity: number | string
  seat_count: number | string
  ticket_type: TicketType
  unit_price: number | string
  total_price: number | string
  person_in_charge_id: string
  person_in_charge_name: string
  person_in_charge_phone_number: string
  status: BookingStatus | string
  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 & {
  booking_id: string
  confirmation_token: string
  receipt_token: string
  customer_name: string
  customer_phone: string
  booking_mode: string
  quantity: number | string
  seat_count: number | string
  ticket_type: TicketType
  unit_price: number | string
  total_price: number | string
  status: BookingStatus | string
  booking_created_at: Date | string
  confirmed_at: Date | string | null
}

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

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

function normalizeBookingMode(value: string): BookingMode {
  return isBookingMode(value) ? value : 'seat'
}

function mapBooking(row: DbBookingRow): PublicBooking {
  const seatCount = parseInteger(row.seat_count)

  return {
    id: row.id,
    confirmationToken: row.confirmation_token,
    receiptToken: row.receipt_token,
    customerName: row.customer_name,
    customerPhone: row.customer_phone,
    bookingMode: normalizeBookingMode(row.booking_mode),
    quantity: parseInteger(row.quantity),
    seatCount,
    ticketType: row.ticket_type,
    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,
    status: isBookingStatus(row.status) ? row.status : 'pending',
    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)

  return {
    id: row.id,
    receiptToken: row.receipt_token,
    customerName: row.customer_name,
    customerPhone: row.customer_phone,
    bookingMode: normalizeBookingMode(row.booking_mode),
    quantity: parseInteger(row.quantity),
    seatCount,
    ticketType: row.ticket_type,
    unitPrice: parseInteger(row.unit_price),
    totalPrice: parseInteger(row.total_price),
    status: isBookingStatus(row.status) ? row.status : 'pending',
    createdAt: toIsoString('booking_created_at' in row ? row.booking_created_at : row.created_at) ?? new Date().toISOString(),
    confirmedAt: toIsoString(row.confirmed_at)
  }
}

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
    ? (row.total_tables === null ? null : parseInteger(row.total_tables) * 10)
    : parseInteger(row.total_seats)

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

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: {
  customerName: string
  customerPhone: string
  bookingMode: BookingMode
  quantity: number
  seatCount: number
  ticketType: TicketType
  unitPrice: number
  totalPrice: number
  personInChargeId: string
  personInChargeName: string
  personInChargePhoneNumber: 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[]>`
      insert into bookings (
        id,
        confirmation_token,
        receipt_token,
        customer_name,
        customer_phone,
        booking_mode,
        quantity,
        seat_count,
        ticket_type,
        unit_price,
        total_price,
        person_in_charge_id,
        person_in_charge_name,
        person_in_charge_phone_number,
        status
      )
      values (
        ${bookingId},
        ${confirmationToken},
        ${receiptToken},
        ${input.customerName},
        ${input.customerPhone},
        ${input.bookingMode},
        ${input.quantity},
        ${input.seatCount},
        ${input.ticketType},
        ${input.unitPrice},
        ${input.totalPrice},
        ${input.personInChargeId},
        ${input.personInChargeName},
        ${input.personInChargePhoneNumber},
        'pending'
      )
      returning
        id,
        confirmation_token,
        receipt_token,
        customer_name,
        customer_phone,
        booking_mode,
        quantity,
        seat_count,
        ticket_type,
        unit_price,
        total_price,
        person_in_charge_id,
        person_in_charge_name,
        person_in_charge_phone_number,
        status,
        created_at,
        confirmed_at
    `

    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
      id,
      confirmation_token,
      receipt_token,
      customer_name,
      customer_phone,
      booking_mode,
      quantity,
      seat_count,
      ticket_type,
      unit_price,
      total_price,
      person_in_charge_id,
      person_in_charge_name,
      person_in_charge_phone_number,
      status,
      created_at,
      confirmed_at
    from bookings
    where 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
      id,
      confirmation_token,
      receipt_token,
      customer_name,
      customer_phone,
      booking_mode,
      quantity,
      seat_count,
      ticket_type,
      unit_price,
      total_price,
      person_in_charge_id,
      person_in_charge_name,
      person_in_charge_phone_number,
      status,
      created_at,
      confirmed_at
    from bookings
    where 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
        id,
        confirmation_token,
        receipt_token,
        customer_name,
        customer_phone,
        booking_mode,
        quantity,
        seat_count,
        ticket_type,
        unit_price,
        total_price,
        person_in_charge_id,
        person_in_charge_name,
        person_in_charge_phone_number,
        status,
        created_at,
        confirmed_at
      from bookings
      where person_in_charge_id = ${options.personInChargeId}
      order by created_at desc
    `
    : await sql<DbBookingRow[]>`
      select
        id,
        confirmation_token,
        receipt_token,
        customer_name,
        customer_phone,
        booking_mode,
        quantity,
        seat_count,
        ticket_type,
        unit_price,
        total_price,
        person_in_charge_id,
        person_in_charge_name,
        person_in_charge_phone_number,
        status,
        created_at,
        confirmed_at
      from bookings
      order by created_at desc
    `

  return rows.map(mapBooking)
}

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: mapReceiptBooking({
      id: booking.id,
      confirmation_token: booking.confirmationToken,
      receipt_token: booking.receiptToken,
      customer_name: booking.customerName,
      customer_phone: booking.customerPhone,
      booking_mode: booking.bookingMode,
      quantity: booking.quantity,
      seat_count: booking.seatCount,
      ticket_type: booking.ticketType,
      unit_price: booking.unitPrice,
      total_price: booking.totalPrice,
      person_in_charge_id: booking.personInChargeId,
      person_in_charge_name: booking.personInChargeName,
      person_in_charge_phone_number: booking.personInChargePhoneNumber,
      status: booking.status,
      created_at: booking.createdAt,
      confirmed_at: booking.confirmedAt
    }),
    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,
      bookings.customer_name,
      bookings.customer_phone,
      bookings.booking_mode,
      bookings.quantity,
      bookings.seat_count,
      bookings.ticket_type,
      bookings.unit_price,
      bookings.total_price,
      bookings.status,
      bookings.created_at as booking_created_at,
      bookings.confirmed_at
    from booking_seats
    inner join bookings on bookings.id = booking_seats.booking_id
    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
      total_tables,
      total_seats,
      updated_at
    from booking_settings
    where id = 'default'
    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()
    where id = 'default'
    returning
      total_tables,
      total_seats,
      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[]>`
    update bookings
    set
      status = 'confirmed',
      confirmed_at = now(),
      updated_at = now()
    where confirmation_token = ${confirmationToken}
      and status = 'pending'
    returning
      id,
      confirmation_token,
      receipt_token,
      customer_name,
      customer_phone,
      booking_mode,
      quantity,
      seat_count,
      ticket_type,
      unit_price,
      total_price,
      person_in_charge_id,
      person_in_charge_name,
      person_in_charge_phone_number,
      status,
      created_at,
      confirmed_at
  `

  if (row) {
    return mapBooking(row)
  }

  return await getBookingByConfirmationToken(confirmationToken)
}