import { differenceInCalendarDays, format, isWeekend } from "date-fns"

import { trackEvent } from "@scandic-hotels/tracking/base"
import {
  type LowestRoomPriceEvent,
  TrackingChannelEnum,
  type TrackingSDKHotelInfo,
  type TrackingSDKPageData,
} from "@scandic-hotels/tracking/types"
import { ChildBedMapEnum } from "@scandic-hotels/trpc/enums/childBedMapEnum"

import type { Lang } from "@scandic-hotels/common/constants/language"
import type { Child } from "@scandic-hotels/trpc/types/child"

import type { Room } from "../../../types/components/selectRate/selectRate"

type ChildrenInRoom = (Child[] | null)[] | null

type SelectRateTrackingInput = {
  lang: Lang
  arrivalDate: Date
  departureDate: Date
  hotelId: string
  hotelName: string
  country: string | undefined
  hotelCity: string | undefined
  bookingCode?: string
  isRedemption?: boolean
  specialRoomType?: string
  rooms?: Room[]
}

export function getSelectRateTracking({
  lang,
  arrivalDate,
  departureDate,
  hotelId,
  hotelName,
  country,
  hotelCity,
  bookingCode,
  isRedemption = false,
  specialRoomType,
  rooms = [],
}: SelectRateTrackingInput) {
  const pageTrackingData: TrackingSDKPageData = {
    channel: TrackingChannelEnum.hotelreservation,
    domainLanguage: lang,
    pageId: "select-rate",
    pageName: "hotelreservation|select-rate",
    pageType: "bookingroomsandratespage",
    siteSections: "hotelreservation|select-rate",
    siteVersion: "new-web",
  }

  let adultsInRoom: number[] = []
  let childrenInRoom: ChildrenInRoom = null
  if (rooms?.length) {
    adultsInRoom = rooms.map((room) => room.adults ?? 0)
    childrenInRoom = rooms.map((room) => room.childrenInRoom ?? null)
  }

  const hotelsTrackingData: TrackingSDKHotelInfo = {
    ageOfChildren: childrenInRoom
      ?.map((c) => c?.map((k) => k.age).join(",") ?? "")
      .join("|"),
    arrivalDate: format(arrivalDate, "yyyy-MM-dd"),
    bookingTypeofDay: isWeekend(arrivalDate) ? "weekend" : "weekday",
    childBedPreference: childrenInRoom
      ?.map((c) => c?.map((k) => ChildBedMapEnum[k.bed]).join(",") ?? "")
      .join("|"),
    country,
    departureDate: format(departureDate, "yyyy-MM-dd"),
    duration: differenceInCalendarDays(departureDate, arrivalDate),
    hotelID: hotelId,
    leadTime: differenceInCalendarDays(arrivalDate, new Date()),
    noOfAdults: adultsInRoom.join(","),
    noOfChildren: childrenInRoom?.map((kids) => kids?.length ?? 0).join(","),
    noOfRooms: rooms?.length ?? 0,
    region: hotelCity,
    searchTerm: hotelName,
    searchType: "hotel",
    bookingCode: bookingCode ?? "n/a",
    rewardNight: isRedemption ? "yes" : "no",
    specialRoomType,
  }

  return {
    hotelsTrackingData,
    pageTrackingData,
  }
}

export function trackLowestRoomPrice(event: LowestRoomPriceEvent) {
  trackEvent({
    event: "lowestRoomPrice",
    hotelInfo: {
      hotelId: event.hotelId,
      arrivalDate: event.arrivalDate,
      departureDate: event.departureDate,
    },
    viewItemInfo: {
      lowestPrice: event.lowestPrice,
      currency: event.currency,
    },
  })
}

export function trackRoomsLoaded() {
  trackEvent({
    event: "RoomsLoadedEvent",
  })
}