import isEqual from "fast-deep-equal"

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

import { getLang } from "@/i18n/serverContext"

import type { BookingData } from "@/types/components/hotelReservation/enterDetails/bookingData"
import { CurrencyEnum } from "@/types/enums/currency"
import { StepEnum } from "@/types/enums/step"
import type { DetailsState, 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 checkIsSameBooking(prev: BookingData, next: BookingData) {
  return isEqual(prev, next)
}

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 {
      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 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"]
) {
  const roomAndTotalPrice = {
    roomPrice: state.roomPrice,
    totalPrice: state.totalPrice,
  }
  if (state.requestedPrice?.pricePerStay) {
    roomAndTotalPrice.roomPrice.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.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
}