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

import { CancellationRuleEnum } from "@scandic-hotels/common/constants/booking"
import { CurrencyEnum } from "@scandic-hotels/common/constants/currency"
import { RateEnum } from "@scandic-hotels/common/constants/rate"
import {
  TrackingChannelEnum,
  type TrackingSDKAncillaries,
  type TrackingSDKHotelInfo,
  type TrackingSDKPageData,
  type TrackingSDKPaymentInfo,
} from "@scandic-hotels/tracking/types"
import { BreakfastPackageEnum } from "@scandic-hotels/trpc/enums/breakfast"
import { RoomPackageCodeEnum } from "@scandic-hotels/trpc/enums/roomFilter"

import { readPaymentInfoFromSessionStorage } from "../../../components/EnterDetails/Payment/helpers"
import { invertedBedTypeMap } from "../../../utils/SelectRate"
import { getSpecialRoomType } from "../../../utils/specialRoomType"

import type { Lang } from "@scandic-hotels/common/constants/language"
import type { BookingConfirmation } from "@scandic-hotels/trpc/types/bookingConfirmation"
import type { RateDefinition } from "@scandic-hotels/trpc/types/roomAvailability"

import type { Room } from "../../../types/stores/booking-confirmation"

function getRate(cancellationRule: RateDefinition["cancellationRule"] | null) {
  switch (cancellationRule) {
    case "CancellableBefore6PM":
      return RateEnum.flex
    case "Changeable":
      return RateEnum.change
    case "NotCancellable":
      return RateEnum.save
    default:
      return ""
  }
}

function mapAncillaryPackage(
  ancillaryPackage: BookingConfirmation["booking"]["packages"][number],
  operaId: string
) {
  const isPoints = ancillaryPackage.currency === CurrencyEnum.POINTS
  return {
    hotelid: operaId,
    productCategory: "", // TODO: Add category
    productId: ancillaryPackage.code,
    productName: ancillaryPackage.description,
    productPoints: isPoints ? ancillaryPackage.totalPrice : 0,
    productPrice: isPoints ? 0 : ancillaryPackage.totalPrice,
    productType:
      ancillaryPackage.code === BreakfastPackageEnum.REGULAR_BREAKFAST
        ? "food"
        : "room preference",
    productUnits: ancillaryPackage.totalUnit,
    productDeliveryTime: "",
  }
}

export function getTracking(
  lang: Lang,
  booking: BookingConfirmation["booking"],
  hotel: BookingConfirmation["hotel"],
  rooms: Room[],
  searchTerm?: string
) {
  const arrivalDate = new Date(booking.checkInDate)
  const departureDate = new Date(booking.checkOutDate)
  const paymentInfoSessionData = readPaymentInfoFromSessionStorage()

  const pageTrackingData: TrackingSDKPageData = {
    channel: TrackingChannelEnum.hotelreservation,
    domainLanguage: lang,
    pageId: "booking-confirmation",
    pageName: `hotelreservation|confirmation`,
    pageType: "confirmation",
    siteSections: `hotelreservation|confirmation`,
    siteVersion: "new-web",
  }

  const noOfAdults = rooms.map((r) => r.adults).join(",")
  const noOfChildren = rooms.map((r) => r.childrenAges?.length ?? 0).join(",")
  const noOfRooms = rooms.length
  const isFlexBooking =
    booking.rateDefinition.cancellationRule ===
    CancellationRuleEnum.CancellableBefore6PM
  const isGuaranteedFlexBooking = booking.guaranteeInfo && isFlexBooking

  const ancillaries: TrackingSDKAncillaries = rooms
    .flatMap((r) => r.packages)
    .filter(
      (p) =>
        p.code === RoomPackageCodeEnum.PET_ROOM ||
        p.code === BreakfastPackageEnum.REGULAR_BREAKFAST
    )
    .map((pkg) => mapAncillaryPackage(pkg, hotel.operaId))

  const hotelsTrackingData: TrackingSDKHotelInfo = {
    ageOfChildren: rooms.map((r) => r.childrenAges?.join(",") ?? "").join("|"),
    analyticsRateCode: rooms
      .map((r) => getRate(r.rateDefinition.cancellationRule))
      .join("|"),
    arrivalDate: format(arrivalDate, "yyyy-MM-dd"),
    bedType: rooms
      .map((r) => r.bedType)
      .join(",")
      .toLowerCase(),
    bnr: rooms.map((r) => r.confirmationNumber).join(","),
    bookingCode: rooms.map((room) => room.bookingCode ?? "n/a").join(", "),
    bookingCodeAvailability: booking.bookingCode
      ? rooms.map((room) => (room.bookingCode ? "true" : "false")).join(", ")
      : undefined,
    bookingTypeofDay: isWeekend(arrivalDate) ? "weekend" : "weekday",
    breakfastOption: rooms
      .map((r) => {
        if (r.breakfastIncluded || r.breakfast) {
          return "breakfast buffet"
        }
        return "no breakfast"
      })
      .join(","),
    childBedPreference: rooms
      .map(
        (r) =>
          r.childBedPreferences
            .map((cbp) =>
              Array(cbp.quantity).fill(invertedBedTypeMap[cbp.bedType])
            )
            .join(",") ?? ""
      )
      .join("|"),
    country: hotel?.address.country,
    departureDate: format(departureDate, "yyyy-MM-dd"),
    duration: differenceInCalendarDays(departureDate, arrivalDate),
    hotelID: hotel.operaId,
    leadTime: differenceInCalendarDays(arrivalDate, new Date()),
    noOfAdults,
    noOfChildren,
    noOfRooms,
    rateCode: rooms.map((r) => r.rateDefinition.rateCode).join(","),
    rateCodeCancellationRule: rooms
      .map((r) => r.rateDefinition.cancellationRule)
      .join(",")
      .toLowerCase(),
    rateCodeName: rooms.map(constructRateCodeName).join(","),
    rateCodeType: rooms.map((r) => r.rateCodeType?.toLowerCase()).join(","),
    region: hotel?.address.city,
    revenueCurrencyCode: [...new Set(rooms.map((r) => r.currencyCode))].join(
      ","
    ),
    rewardNight: booking.roomPoints > 0 ? "yes" : "no",
    rewardNightAvailability: booking.roomPoints > 0 ? "true" : "false",
    points: booking.roomPoints > 0 ? booking.roomPoints : undefined,
    roomPrice: rooms.reduce((total, room) => total + room.roomPrice, 0),
    roomTypeCode: rooms.map((r) => r.roomTypeCode ?? "").join(","),
    searchTerm,
    searchType: "hotel",
    specialRoomType: rooms
      .map((room) => getSpecialRoomType(room.packages))
      .join(","),
    totalPrice: rooms.reduce((total, room) => total + room.totalPrice, 0),
    lateArrivalGuarantee: booking.rateDefinition.mustBeGuaranteed
      ? "mandatory"
      : isFlexBooking
        ? booking.guaranteeInfo
          ? "yes"
          : "no"
        : "na",
    guaranteedProduct: isGuaranteedFlexBooking ? "room" : "na",
    emailId: getSHAHash(booking.guest.email),
    mobileNumber: getSHAHash(booking.guest.phoneNumber),
  }

  const paymentInfo: TrackingSDKPaymentInfo = {
    paymentStatus: isGuaranteedFlexBooking
      ? "glacardsaveconfirmed"
      : "confirmed",
    type:
      booking.guaranteeInfo?.cardType ?? paymentInfoSessionData?.paymentMethod,
  }

  return {
    hotelsTrackingData,
    pageTrackingData,
    paymentInfo,
    ancillaries,
  }
}

function constructRateCodeName(room: Room) {
  if (room.cheques) {
    return "corporate cheque"
  } else if (room.vouchers) {
    return "voucher"
  } else if (room.roomPoints) {
    return "redemption"
  }

  const rate = getRate(room.rateDefinition.cancellationRule)

  const bookingCodeStr = room.bookingCode ? room.bookingCode.toUpperCase() : ""

  const breakfastIncludedStr = room.breakfastIncluded
    ? "incl. breakfast"
    : "excl. breakfast"

  return [bookingCodeStr, rate, breakfastIncludedStr]
    .filter(Boolean)
    .join(" - ")
}

function getSHAHash(key: string) {
  return createHash("sha256").update(key).digest("hex")
}