web/packages/trpc/lib/routers/hotels/availability/hotelsByCityWithBookingCode.ts

import { serviceProcedure } from "../../../procedures"
import { toApiLang } from "../../../utils"
import { getHotelsAvailabilityByCity } from "../services/getHotelsAvailabilityByCity"
import { getHotelsAvailabilityByHotelIds } from "../services/getHotelsAvailabilityByHotelIds"
import { hotelsAvailabilityInputSchema } from "./hotelsByCity"

export const hotelsByCityWithBookingCode = serviceProcedure
  .input(hotelsAvailabilityInputSchema)
  .query(async ({ input, ctx }) => {
    const { lang } = ctx
    const apiLang = toApiLang(lang)

    const bookingCodeAvailabilityResponse = await getHotelsAvailabilityByCity(
      input,
      apiLang,
      ctx.serviceToken
    )

    // Get regular availability of hotels which don't have availability with booking code.
    const unavailableHotelIds = bookingCodeAvailabilityResponse.availability
      .filter((hotel) => {
        return hotel.status === "NotAvailable"
      })
      .flatMap((hotel) => {
        return hotel.hotelId
      })

    // All hotels have availability with booking code no need to fetch regular prices.
    // return response as is without any filtering as below.
    if (!unavailableHotelIds || !unavailableHotelIds.length) {
      return bookingCodeAvailabilityResponse
    }

    const unavailableHotelsInput = {
      ...input,
      bookingCode: "",
      hotelIds: unavailableHotelIds,
    }
    const unavailableHotels = await getHotelsAvailabilityByHotelIds(
      unavailableHotelsInput,
      apiLang,
      ctx.serviceToken
    )

    // No regular rates available due to network or API failure (no need to filter & merge).
    if (!unavailableHotels) {
      return bookingCodeAvailabilityResponse
    }

    // Filtering the response hotels to merge bookingCode rates and regular rates in single response.
    return {
      availability: bookingCodeAvailabilityResponse.availability
        .filter((hotel) => {
          return hotel.status === "Available"
        })
        .concat(unavailableHotels.availability),
    }
  })