import * as mongoose from 'mongoose'
import BookerModel, { Booker } from './booker'
import BookingModel, { Booking } from './booking'
import BillModel, { Bill } from './bill'
import { BOOKING_STATUS } from './enums'

let connectedPromise: Promise<typeof mongoose>

function connect() {
  if (connectedPromise) {
    return
  }

  connectedPromise = mongoose.connect(process.env.MONGO_URI, {
    useCreateIndex: true,
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })

  return connectedPromise
}

export async function getBookedDays() {
  await connect()
  return BookingModel.findBookedDays()
}

export async function getBookingByUUID(uuid: string) {
  await connect()
  return BookingModel.findOne({ uuid })
}

export async function getBookings({
  status = [BOOKING_STATUS.CONFIRMED, BOOKING_STATUS.REQUESTED],
  startDateGreaterThan = '2000-01-01T00:00:00Z',
}: { status?: BOOKING_STATUS[]; startDateGreaterThan?: string } = {}) {
  await connect()
  return await BookingModel.find({
    status: { $in: status },
    startDate: { $gte: startDateGreaterThan },
  })
    .populate('booker')
    .exec()
}

export async function createBooking({
  startDate,
  endDate,
  purpose,
  org,
  destination,
  name,
  email,
  phone,
  street,
  zip,
  city,
}: Booking & Booker): Promise<Booking> {
  await connect()
  const booking = new BookingModel({
    startDate,
    endDate,
    purpose,
    org,
    destination,
  })

  let booker = await BookerModel.findOne({ email }).exec()
  if (!booker) {
    booker = new BookerModel({ name, email, phone, street, zip, city })
    await booker.save()
  }

  booking.booker = booker._id
  await booking.save()
  await booking.populate('booker').execPopulate()
  return booking.toJSON()
}

export async function createBill(
  bookingUUID: string,
  billData: Bill
): Promise<Bill> {
  await connect()
  const booking = await getBookingByUUID(bookingUUID)

  const bill = new BillModel()
  bill.set(billData)

  await bill.save()

  booking.bill = bill._id
  await booking.save()

  return bill.toJSON()
}

export async function patchBill(
  bookingUUID: string,
  billData: Bill
): Promise<Bill> {
  await connect()
  const booking = await getBookingByUUID(bookingUUID)
  const bill =
    (booking.bill && (await BillModel.findById(booking.bill))) ||
    (await BillModel.create())

  bill.set(billData)
  await bill.save()

  if (booking.bill !== bill._id) {
    booking.bill = bill._id
    await booking.save()
  }

  return bill.toJSON()
}

export async function getMilageMax(): Promise<number> {
  const billMaxMilageEnd = await BillModel.findOne({})
    .sort('-milageEnd')
    .select('milageEnd')
    .exec()

  return billMaxMilageEnd?.milageEnd || 0
}