import { metrics } from "@opentelemetry/api"
import { unstable_cache } from "next/cache"

import * as api from "@/lib/api"
import { GetHotelPage } from "@/lib/graphql/Query/HotelPage/HotelPage.graphql"
import { request } from "@/lib/graphql/request"
import {
  badRequestError,
  notFound,
  serverErrorByStatus,
} from "@/server/errors/trpc"
import { extractHotelImages } from "@/server/routers/utils/hotels"
import {
  contentStackUidWithServiceProcedure,
  publicProcedure,
  router,
  serviceProcedure,
} from "@/server/trpc"
import { toApiLang } from "@/server/utils"

import { hotelPageSchema } from "../contentstack/hotelPage/output"
import {
  getAvailabilityInputSchema,
  getHotelInputSchema,
  getlHotelDataInputSchema,
  getRatesInputSchema,
} from "./input"
import {
  getAvailabilitySchema,
  getHotelDataSchema,
  getRatesSchema,
  roomSchema,
} from "./output"
import tempRatesData from "./tempRatesData.json"
import {
  getCitiesByCountry,
  getCountries,
  getLocations,
  locationsAffix,
  TWENTYFOUR_HOURS,
} from "./utils"

import { AvailabilityEnum } from "@/types/components/hotelReservation/selectHotel/selectHotel"
import type { RequestOptionsWithOutBody } from "@/types/fetch"
import type { GetHotelPageData } from "@/types/trpc/routers/contentstack/hotelPage"

const meter = metrics.getMeter("trpc.hotels")
const getHotelCounter = meter.createCounter("trpc.hotel.get")
const getHotelSuccessCounter = meter.createCounter("trpc.hotel.get-success")
const getHotelFailCounter = meter.createCounter("trpc.hotel.get-fail")

const availabilityCounter = meter.createCounter("trpc.hotel.availability")
const availabilitySuccessCounter = meter.createCounter(
  "trpc.hotel.availability-success"
)
const availabilityFailCounter = meter.createCounter(
  "trpc.hotel.availability-fail"
)

async function getContentstackData(
  locale: string,
  uid: string | null | undefined
) {
  const response = await request<GetHotelPageData>(GetHotelPage, {
    locale,
    uid,
  })

  if (!response.data) {
    throw notFound(response)
  }

  const hotelPageData = hotelPageSchema.safeParse(response.data)
  if (!hotelPageData.success) {
    console.error(
      `Failed to validate Hotel Page - (uid: ${uid}, lang: ${locale})`
    )
    console.error(hotelPageData.error)
    return null
  }

  return hotelPageData.data.hotel_page
}

export const hotelQueryRouter = router({
  get: contentStackUidWithServiceProcedure
    .input(getHotelInputSchema)
    .query(async ({ ctx, input }) => {
      const { lang, uid } = ctx
      const { include } = input
      const contentstackData = await getContentstackData(lang, uid)
      const hotelId = contentstackData?.hotel_page_id

      if (!hotelId) {
        throw notFound(`Hotel not found for uid: ${uid}`)
      }

      const apiLang = toApiLang(lang)
      const params: Record<string, string> = {
        hotelId,
        language: apiLang,
      }

      if (include) {
        params.include = include.join(",")
      }

      getHotelCounter.add(1, { hotelId, lang, include })
      console.info(
        "api.hotels.hotel start",
        JSON.stringify({
          query: { hotelId, params },
        })
      )
      const apiResponse = await api.get(
        `${api.endpoints.v1.hotels}/${hotelId}`,
        {
          headers: {
            Authorization: `Bearer ${ctx.serviceToken}`,
          },
        },
        params
      )

      if (!apiResponse.ok) {
        const text = await apiResponse.text()
        getHotelFailCounter.add(1, {
          hotelId,
          lang,
          include,
          error_type: "http_error",
          error: JSON.stringify({
            status: apiResponse.status,
            statusText: apiResponse.statusText,
            text,
          }),
        })
        console.error(
          "api.hotels.hotel error",
          JSON.stringify({
            query: { hotelId, params },
            error: {
              status: apiResponse.status,
              statusText: apiResponse.statusText,
              text,
            },
          })
        )
        throw serverErrorByStatus(apiResponse.status, apiResponse)
      }
      const apiJson = await apiResponse.json()
      const validatedHotelData = getHotelDataSchema.safeParse(apiJson)

      if (!validatedHotelData.success) {
        getHotelFailCounter.add(1, {
          hotelId,
          lang,
          include,
          error_type: "validation_error",
          error: JSON.stringify(validatedHotelData.error),
        })

        console.error(
          "api.hotels.hotel validation error",
          JSON.stringify({
            query: { hotelId, params },
            error: validatedHotelData.error,
          })
        )
        throw badRequestError()
      }

      const included = validatedHotelData.data.included || []

      const hotelAttributes = validatedHotelData.data.data.attributes

      const images = extractHotelImages(hotelAttributes)

      const roomCategories = included
        ? included
          .filter((item) => item.type === "roomcategories")
          .map((roomCategory) => {
            const validatedRoom = roomSchema.safeParse(roomCategory)
            if (!validatedRoom.success) {
              getHotelFailCounter.add(1, {
                hotelId,
                lang,
                include,
                error_type: "validation_error",
                error: JSON.stringify(
                  validatedRoom.error.issues.map(({ code, message }) => ({
                    code,
                    message,
                  }))
                ),
              })
              console.error(
                "api.hotels.hotel validation error",
                JSON.stringify({
                  query: { hotelId, params },
                  error: validatedRoom.error,
                })
              )
              throw badRequestError()
            }

            return validatedRoom.data
          })
        : []

      const activities = contentstackData?.content
        ? contentstackData?.content[0]
        : null

      getHotelSuccessCounter.add(1, { hotelId, lang, include })
      console.info(
        "api.hotels.hotel success",
        JSON.stringify({
          query: { hotelId, params: params },
        })
      )
      return {
        hotelName: hotelAttributes.name,
        hotelDescription: hotelAttributes.hotelContent.texts.descriptions.short,
        hotelLocation: hotelAttributes.location,
        hotelAddress: hotelAttributes.address,
        hotelRatings: hotelAttributes.ratings,
        hotelDetailedFacilities: hotelAttributes.detailedFacilities,
        hotelImages: images,
        pointsOfInterest: hotelAttributes.pointsOfInterest,
        roomCategories,
        activitiesCard: activities?.upcoming_activities_card,
      }
    }),
  availability: router({
    get: serviceProcedure
      .input(getAvailabilityInputSchema)
      .query(async ({ input, ctx }) => {
        const {
          cityId,
          roomStayStartDate,
          roomStayEndDate,
          adults,
          children,
          promotionCode,
          reservationProfileType,
          attachedProfileId,
        } = input

        const params: Record<string, string | number> = {
          roomStayStartDate,
          roomStayEndDate,
          adults,
          children,
          promotionCode,
          reservationProfileType,
          attachedProfileId,
        }

        availabilityCounter.add(1, {
          cityId,
          roomStayStartDate,
          roomStayEndDate,
          adults,
          children,
          promotionCode,
          reservationProfileType,
        })
        console.info(
          "api.hotels.availability start",
          JSON.stringify({ query: { cityId, params } })
        )
        const apiResponse = await api.get(
          `${api.endpoints.v0.availability}/${cityId}`,
          {
            headers: {
              Authorization: `Bearer ${ctx.serviceToken}`,
            },
          },
          params
        )
        if (!apiResponse.ok) {
          const text = await apiResponse.text()
          availabilityFailCounter.add(1, {
            cityId,
            roomStayStartDate,
            roomStayEndDate,
            adults,
            children,
            promotionCode,
            reservationProfileType,
            error_type: "http_error",
            error: JSON.stringify({
              status: apiResponse.status,
              statusText: apiResponse.statusText,
              text,
            }),
          })
          console.error(
            "api.hotels.availability error",
            JSON.stringify({
              query: { cityId, params },
              error: {
                status: apiResponse.status,
                statusText: apiResponse.statusText,
                text,
              },
            })
          )
          return null
        }
        const apiJson = await apiResponse.json()
        const validateAvailabilityData =
          getAvailabilitySchema.safeParse(apiJson)
        if (!validateAvailabilityData.success) {
          availabilityFailCounter.add(1, {
            cityId,
            roomStayStartDate,
            roomStayEndDate,
            adults,
            children,
            promotionCode,
            reservationProfileType,
            error_type: "validation_error",
            error: JSON.stringify(validateAvailabilityData.error),
          })
          console.error(
            "api.hotels.availability validation error",
            JSON.stringify({
              query: { cityId, params },
              error: validateAvailabilityData.error,
            })
          )
          throw badRequestError()
        }
        availabilitySuccessCounter.add(1, {
          cityId,
          roomStayStartDate,
          roomStayEndDate,
          adults,
          children,
          promotionCode,
          reservationProfileType,
        })
        console.info(
          "api.hotels.availability success",
          JSON.stringify({
            query: { cityId, params: params },
          })
        )
        return {
          availability: validateAvailabilityData.data.data
            .filter(
              (hotels) =>
                hotels.attributes.status === AvailabilityEnum.Available
            )
            .flatMap((hotels) => hotels.attributes),
        }
      }),
  }),
  rates: router({
    get: publicProcedure
      .input(getRatesInputSchema)
      .query(async ({ input, ctx }) => {
        // TODO: Do a real API call when the endpoint is ready
        // const { hotelId } = input

        // const params = new URLSearchParams()
        // const apiLang = toApiLang(language)
        // params.set("hotelId", hotelId.toString())
        // params.set("language", apiLang)

        console.info("api.hotels.rates start", JSON.stringify({}))
        const validatedHotelData = getRatesSchema.safeParse(tempRatesData)

        if (!tempRatesData) {
          console.error(
            "api.hotels.rates error",
            JSON.stringify({ error: null })
          )
          //Can't return null here since consuming component does not handle null yet
          // return null
        }
        if (!validatedHotelData.success) {
          console.error(
            "api.hotels.rates validation error",
            JSON.stringify({
              error: validatedHotelData.error,
            })
          )
          throw badRequestError()
        }
        console.info("api.hotels.rates success", JSON.stringify({}))
        return validatedHotelData.data
      }),
  }),
  hotelData: router({
    get: serviceProcedure
      .input(getlHotelDataInputSchema)
      .query(async ({ ctx, input }) => {
        const { hotelId, language, include } = input

        const params: Record<string, string> = {
          hotelId,
          language,
        }

        if (include) {
          params.include = include.join(",")
        }

        getHotelCounter.add(1, {
          hotelId,
          language,
          include,
        })
        console.info(
          "api.hotels.hotelData start",
          JSON.stringify({ query: { hotelId, params } })
        )

        const apiResponse = await api.get(
          `${api.endpoints.v1.hotels}/${hotelId}`,
          {
            headers: {
              Authorization: `Bearer ${ctx.serviceToken}`,
            },
          },
          params
        )

        if (!apiResponse.ok) {
          const text = await apiResponse.text()
          getHotelFailCounter.add(1, {
            hotelId,
            language,
            include,
            error_type: "http_error",
            error: JSON.stringify({
              status: apiResponse.status,
              statusText: apiResponse.statusText,
              text,
            }),
          })
          console.error(
            "api.hotels.hotelData error",
            JSON.stringify({
              query: { hotelId, params },
              error: {
                status: apiResponse.status,
                statusText: apiResponse.statusText,
                text,
              },
            })
          )
          return null
        }

        const apiJson = await apiResponse.json()
        const validateHotelData = getHotelDataSchema.safeParse(apiJson)

        if (!validateHotelData.success) {
          getHotelFailCounter.add(1, {
            hotelId,
            language,
            include,
            error_type: "validation_error",
            error: JSON.stringify(validateHotelData.error),
          })

          console.error(
            "api.hotels.hotelData validation error",
            JSON.stringify({
              query: { hotelId, params },
              error: validateHotelData.error,
            })
          )
          throw badRequestError()
        }

        getHotelSuccessCounter.add(1, {
          hotelId,
          language,
          include,
        })
        console.info(
          "api.hotels.hotelData success",
          JSON.stringify({
            query: { hotelId, params: params },
          })
        )
        return validateHotelData.data
      }),
  }),
  locations: router({
    get: serviceProcedure.query(async function ({ ctx }) {
      const searchParams = new URLSearchParams()
      searchParams.set("language", toApiLang(ctx.lang))

      const options: RequestOptionsWithOutBody = {
        // needs to clear default option as only
        // cache or next.revalidate is permitted
        cache: undefined,
        headers: {
          Authorization: `Bearer ${ctx.serviceToken}`,
        },
        next: {
          revalidate: TWENTYFOUR_HOURS,
        },
      }

      const getCachedCountries = unstable_cache(
        getCountries,
        [`${ctx.lang}:${locationsAffix}:countries`],
        { revalidate: TWENTYFOUR_HOURS }
      )

      const countries = await getCachedCountries(options, searchParams)

      const getCachedCitiesByCountry = unstable_cache(
        getCitiesByCountry,
        [`${ctx.lang}:${locationsAffix}:cities-by-country`],
        { revalidate: TWENTYFOUR_HOURS }
      )

      let citiesByCountry = null
      if (countries) {
        citiesByCountry = await getCachedCitiesByCountry(
          countries,
          options,
          searchParams
        )
      }

      const getCachedLocations = unstable_cache(
        getLocations,
        [`${ctx.lang}:${locationsAffix}`],
        { revalidate: TWENTYFOUR_HOURS }
      )

      const locations = await getCachedLocations(
        ctx.lang,
        options,
        searchParams,
        citiesByCountry
      )

      if (Array.isArray(locations)) {
        return {
          data: locations,
        }
      }

      return locations
    }),
  }),
})