import deepmerge from "deepmerge"
import isEqual from "fast-deep-equal"

import { Lang } from "@/constants/languages"

import { getLang } from "@/i18n/serverContext"
import { arrayMerge } from "@/utils/merge"

import { detailsStorageName } from "."

import type { SelectRateSearchParams } from "@/types/components/hotelReservation/selectRate/selectRate"
import { CurrencyEnum } from "@/types/enums/currency"
import type { StepEnum } from "@/types/enums/step"
import type {
  DetailsState,
  PersistedState,
  PersistedStatePart,
  RoomRate,
} from "@/types/stores/enter-details"
import type { SafeUser } from "@/types/user"

export function langToCurrency() {
  const lang = getLang()
  switch (lang) {
    case Lang.da:
      return CurrencyEnum.DKK
    case Lang.de:
    case Lang.en:
    case Lang.fi:
      return CurrencyEnum.EUR
    case Lang.no:
      return CurrencyEnum.NOK
    case Lang.sv:
      return CurrencyEnum.SEK
    default:
      throw new Error(`Unexpected lang: ${lang}`)
  }
}

export function extractGuestFromUser(user: NonNullable<SafeUser>) {
  return {
    countryCode: user.address.countryCode?.toString(),
    email: user.email,
    firstName: user.firstName,
    lastName: user.lastName,
    join: false,
    membershipNo: user.membership?.membershipNumber,
    phoneNumber: user.phoneNumber ?? "",
  }
}

export function navigate(step: StepEnum, searchParams: string) {
  window.history.pushState({ step }, "", `${step}?${searchParams}`)
}

export function checkIsSameRoom(
  prev: SelectRateSearchParams,
  next: SelectRateSearchParams
) {
  const { rooms: prevRooms, ...prevBooking } = prev

  const prevRoomsWithoutRateCodes = prevRooms.map(
    ({ rateCode, counterRateCode, ...room }) => room
  )
  const { rooms: nextRooms, ...nextBooking } = next

  const nextRoomsWithoutRateCodes = nextRooms.map(
    ({ rateCode, counterRateCode, ...room }) => room
  )

  return isEqual(
    {
      ...prevBooking,
      rooms: prevRoomsWithoutRateCodes,
    },
    {
      ...nextBooking,
      rooms: nextRoomsWithoutRateCodes,
    }
  )
}

export function add(...nums: (number | string | undefined)[]) {
  return nums.reduce((total: number, num) => {
    if (typeof num === "undefined") {
      num = 0
    }
    total = total + parseInt(`${num}`)
    return total
  }, 0)
}

export function subtract(...nums: (number | string | undefined)[]) {
  return nums.reduce((total: number, num, idx) => {
    if (typeof num === "undefined") {
      num = 0
    }
    if (idx === 0) {
      return parseInt(`${num}`)
    }
    total = total - parseInt(`${num}`)
    if (total < 0) {
      return 0
    }
    return total
  }, 0)
}

export function getInitialRoomPrice(roomRate: RoomRate, isMember: boolean) {
  if (isMember && roomRate.memberRate) {
    return {
      perNight: {
        requested: roomRate.memberRate.requestedPrice && {
          currency: roomRate.memberRate.requestedPrice.currency,
          price: roomRate.memberRate.requestedPrice.pricePerNight,
        },
        local: {
          currency: roomRate.memberRate.localPrice.currency,
          price: roomRate.memberRate.localPrice.pricePerNight,
        },
      },
      perStay: {
        requested: roomRate.memberRate.requestedPrice && {
          currency: roomRate.memberRate.requestedPrice.currency,
          price: roomRate.memberRate.requestedPrice.pricePerStay,
        },
        local: {
          currency: roomRate.memberRate.localPrice.currency,
          price: roomRate.memberRate.localPrice.pricePerStay,
        },
      },
    }
  }

  return {
    perNight: {
      requested: roomRate.publicRate.requestedPrice && {
        currency: roomRate.publicRate.requestedPrice.currency,
        price: roomRate.publicRate.requestedPrice.pricePerNight,
      },
      local: {
        currency: roomRate.publicRate.localPrice.currency,
        price: roomRate.publicRate.localPrice.pricePerNight,
      },
    },
    perStay: {
      requested: roomRate.publicRate.requestedPrice && {
        currency: roomRate.publicRate.requestedPrice.currency,
        price: roomRate.publicRate.requestedPrice.pricePerStay,
      },
      local: {
        currency: roomRate.publicRate.localPrice.currency,
        price: roomRate.publicRate.localPrice.pricePerStay,
      },
    },
  }
}

export function getInitialTotalPrice(roomRate: RoomRate, isMember: boolean) {
  if (isMember && roomRate.memberRate) {
    return {
      requested: roomRate.memberRate.requestedPrice && {
        currency: roomRate.memberRate.requestedPrice.currency,
        price: roomRate.memberRate.requestedPrice.pricePerStay,
      },
      local: {
        currency: roomRate.memberRate.localPrice.currency,
        price: roomRate.memberRate.localPrice.pricePerStay,
      },
    }
  }

  return {
    requested: roomRate.publicRate.requestedPrice && {
      currency: roomRate.publicRate.requestedPrice.currency,
      price: roomRate.publicRate.requestedPrice.pricePerStay,
    },
    local: {
      currency: roomRate.publicRate.localPrice.currency,
      price: roomRate.publicRate.localPrice.pricePerStay,
    },
  }
}

export function calcTotalMemberPrice(state: DetailsState) {
  if (!state.roomRate.memberRate) {
    return {
      roomPrice: state.roomPrice,
      totalPrice: state.totalPrice,
    }
  }

  return calcTotalPrice({
    breakfast: state.breakfast,
    packages: state.packages,
    roomPrice: state.roomPrice,
    totalPrice: state.totalPrice,
    ...state.roomRate.memberRate,
  })
}

export function calcTotalPublicPrice(state: DetailsState) {
  return calcTotalPrice({
    breakfast: state.breakfast,
    packages: state.packages,
    roomPrice: state.roomPrice,
    totalPrice: state.totalPrice,
    ...state.roomRate.publicRate,
  })
}

export function calcTotalPrice(
  state: Pick<
    DetailsState,
    "breakfast" | "packages" | "roomPrice" | "totalPrice"
  > &
    DetailsState["roomRate"]["publicRate"]
) {
  // state is sometimes read-only, thus we
  // need to create a deep copy of the values
  const roomAndTotalPrice = {
    roomPrice: {
      perNight: {
        local: { ...state.roomPrice.perNight.local },
        requested: state.roomPrice.perNight.requested
          ? { ...state.roomPrice.perNight.requested }
          : state.roomPrice.perNight.requested,
      },
      perStay: {
        local: { ...state.roomPrice.perStay.local },
        requested: state.roomPrice.perStay.requested
          ? { ...state.roomPrice.perStay.requested }
          : state.roomPrice.perStay.requested,
      },
    },
    totalPrice: {
      local: { ...state.totalPrice.local },
      requested: state.totalPrice.requested
        ? { ...state.totalPrice.requested }
        : state.totalPrice.requested,
    },
  }
  if (state.requestedPrice?.pricePerStay) {
    roomAndTotalPrice.roomPrice.perStay.requested = {
      currency: state.requestedPrice.currency,
      price: state.requestedPrice.pricePerStay,
    }

    let totalPriceRequested = state.requestedPrice.pricePerStay
    if (state.breakfast) {
      totalPriceRequested = add(
        totalPriceRequested,
        state.breakfast.requestedPrice.totalPrice
      )
    }

    if (state.packages) {
      totalPriceRequested = state.packages.reduce((total, pkg) => {
        if (pkg.requestedPrice.totalPrice) {
          total = add(total, pkg.requestedPrice.totalPrice)
        }
        return total
      }, totalPriceRequested)
    }

    roomAndTotalPrice.totalPrice.requested = {
      currency: state.requestedPrice.currency,
      price: totalPriceRequested,
    }
  }

  const roomPriceLocal = state.localPrice
  roomAndTotalPrice.roomPrice.perStay.local = {
    currency: roomPriceLocal.currency,
    price: roomPriceLocal.pricePerStay,
  }

  let totalPriceLocal = roomPriceLocal.pricePerStay
  if (state.breakfast) {
    totalPriceLocal = add(
      totalPriceLocal,
      state.breakfast.localPrice.totalPrice
    )
  }

  if (state.packages) {
    totalPriceLocal = state.packages.reduce((total, pkg) => {
      if (pkg.localPrice.totalPrice) {
        total = add(total, pkg.localPrice.totalPrice)
      }
      return total
    }, totalPriceLocal)
  }
  roomAndTotalPrice.totalPrice.local = {
    currency: roomPriceLocal.currency,
    price: totalPriceLocal,
  }

  return roomAndTotalPrice
}

export function writeToSessionStorage(part: PersistedStatePart) {
  const unparsedData = sessionStorage.getItem(detailsStorageName)
  if (unparsedData) {
    const data: PersistedState = JSON.parse(unparsedData)
    // @ts-expect-error - deepmerge is not to happy with
    // the part type
    const updated = deepmerge(data, part, { arrayMerge })
    sessionStorage.setItem(detailsStorageName, JSON.stringify(updated))
  } else {
    sessionStorage.setItem(detailsStorageName, JSON.stringify(part))
  }
}