import { createCounter } from "@scandic-hotels/common/telemetry"
import { safeTry } from "@scandic-hotels/common/utils/safeTry"

import { router } from "../../.."
import { notFound } from "../../../errors"
import {
  GetDestinationOverviewPage,
  GetDestinationOverviewPageRefs,
} from "../../../graphql/Query/DestinationOverviewPage/DestinationOverviewPage.graphql"
import { request } from "../../../graphql/request"
import {
  contentstackExtendedProcedureUID,
  serviceProcedure,
} from "../../../procedures"
import { ApiCountry } from "../../../types/country"
import {
  generateRefsResponseTag,
  generateTag,
} from "../../../utils/generateTag"
import { getCitiesByCountry } from "../../hotels/services/getCitiesByCountry"
import { getCountries } from "../../hotels/services/getCountries"
import { getHotelIdsByCityId } from "../../hotels/services/getHotelIdsByCityId"
import { getCityPageUrls } from "../destinationCityPage/utils"
import { getCountryPageUrls } from "../destinationCountryPage/utils"
import {
  destinationOverviewPageRefsSchema,
  destinationOverviewPageSchema,
} from "./output"
import { getSortedDestinationsByLanguage } from "./utils"

import type { Country } from "@scandic-hotels/common/constants/country"

import type {
  GetDestinationOverviewPageData,
  GetDestinationOverviewPageRefsSchema,
} from "../../../types/destinationOverviewPage"
import type { City, DestinationsData } from "../../../types/destinationsData"
import type { TrackingPageData } from "../../types"

export const destinationOverviewPageQueryRouter = router({
  get: contentstackExtendedProcedureUID.query(async ({ ctx }) => {
    const { lang, uid } = ctx

    const getDestinationOverviewPageRefsCounter = createCounter(
      "trpc.contentstack.destinationOverviewPage.get.refs"
    )
    const metricsGetDestinationOverviewPageRefs =
      getDestinationOverviewPageRefsCounter.init({ lang, uid })

    metricsGetDestinationOverviewPageRefs.start()

    const refsResponse = await request<GetDestinationOverviewPageRefsSchema>(
      GetDestinationOverviewPageRefs,
      {
        locale: lang,
        uid,
      },
      {
        key: generateRefsResponseTag(lang, uid),
        ttl: "max",
      }
    )
    if (!refsResponse.data) {
      const notFoundError = notFound(refsResponse)
      metricsGetDestinationOverviewPageRefs.noDataError()
      throw notFoundError
    }

    const validatedRefsData = destinationOverviewPageRefsSchema.safeParse(
      refsResponse.data
    )

    if (!validatedRefsData.success) {
      metricsGetDestinationOverviewPageRefs.validationError(
        validatedRefsData.error
      )
      return null
    }

    metricsGetDestinationOverviewPageRefs.success()

    const getDestinationOverviewPageCounter = createCounter(
      "trpc.contentstack.destinationOverviewPage.get"
    )
    const metricsGetDestinationOverviewPage =
      getDestinationOverviewPageCounter.init({ lang, uid })

    metricsGetDestinationOverviewPage.start()

    const response = await request<GetDestinationOverviewPageData>(
      GetDestinationOverviewPage,
      {
        locale: lang,
        uid,
      },
      {
        key: generateTag(lang, uid),
        ttl: "max",
      }
    )
    if (!response.data) {
      const notFoundError = notFound(response)
      metricsGetDestinationOverviewPage.noDataError()
      throw notFoundError
    }

    const destinationOverviewPage = destinationOverviewPageSchema.safeParse(
      response.data
    )

    if (!destinationOverviewPage.success) {
      metricsGetDestinationOverviewPage.validationError(
        destinationOverviewPage.error
      )
      return null
    }

    metricsGetDestinationOverviewPage.success()

    const system = destinationOverviewPage.data.destination_overview_page.system
    const tracking: TrackingPageData = {
      pageId: system.uid,
      domainLanguage: lang,
      publishDate: system.updated_at,
      createDate: system.created_at,
      channel: "hotels",
      pageType: "destinationoverviewpage",
      pageName: "destinations|overview",
      siteSections: "destinations|overview",
      siteVersion: "new-web",
    }

    return {
      destinationOverviewPage:
        destinationOverviewPage.data.destination_overview_page,
      tracking,
    }
  }),
  destinations: router({
    get: serviceProcedure.query(async function ({
      ctx,
    }): Promise<DestinationsData> {
      const { lang } = ctx

      const countries = await getCountries({
        lang,
        serviceToken: ctx.serviceToken,
      })

      if (!countries) {
        return []
      }

      const countryNames = countries.data.map((country) => country.name)

      const citiesByCountry = await getCitiesByCountry({
        lang,
        countries: countryNames,
        serviceToken: ctx.serviceToken,
      })

      const cityPages = await getCityPageUrls(lang)

      const destinations = await Promise.all(
        Object.entries(citiesByCountry).map(async ([country, cities]) => {
          const activeCitiesWithHotelCount: (City | null)[] = await Promise.all(
            cities.map(async (city) => {
              const [hotels] = await safeTry(
                getHotelIdsByCityId({
                  cityId: city.id,
                  serviceToken: ctx.serviceToken,
                })
              )

              const cityPage = cityPages.find(
                (cityPage) => cityPage.city === city.cityIdentifier
              )

              return cityPage?.url
                ? {
                    id: city.id,
                    name: city.name,
                    hotelIds: hotels || [],
                    hotelCount: hotels ? hotels.length : 0,
                    url: cityPage.url,
                  }
                : null
            })
          )
          const filteredActiveCitiesWithHotelCount: City[] =
            activeCitiesWithHotelCount.filter((c): c is City => !!c)

          const countryPages = await getCountryPageUrls(lang)
          const countryPage = countryPages.find(
            (countryPage) =>
              ApiCountry[lang][countryPage.country as Country] === country
          )

          return {
            country,
            countryUrl: countryPage?.url,
            numberOfHotels: filteredActiveCitiesWithHotelCount.reduce(
              (acc, city) => acc + city.hotelCount,
              0
            ),
            cities: filteredActiveCitiesWithHotelCount,
          }
        })
      )
      const data = getSortedDestinationsByLanguage(destinations, lang)

      return data
    }),
  }),
})