import { CurrencyEnum } from "@scandic-hotels/common/constants/currency"
import { PointType } from "@scandic-hotels/common/constants/pointType"
import { formatPrice } from "@scandic-hotels/common/utils/numberFormatting"

import type { IntlShape } from "react-intl"

import type { Room } from "@/types/stores/my-stay"

export function calculateTotalPrice(
  rooms: Pick<
    Room,
    | "cheques"
    | "vouchers"
    | "roomPointType"
    | "roomPoints"
    | "totalPoints"
    | "totalPrice"
    | "isCancelled"
  >[],
  currency: CurrencyEnum,
  intl: IntlShape,
  allRoomsAreCancelled: boolean
) {
  const totals = rooms.reduce(
    (total, room) => {
      if (!allRoomsAreCancelled && room.isCancelled) {
        return total
      }

      if (room.cheques) {
        total.cheques = total.cheques + room.cheques
      }

      if (room.vouchers) {
        total.vouchers = total.vouchers + room.vouchers
      }

      // If roomPointType isn't Scandic, these should be counted as partnerPoints.
      // If they're not Scandic points, we can ignore them on roomPoints as they
      // are included in totalPoints, which in turn never contain partner points.
      if (
        room.roomPoints &&
        room.roomPointType &&
        room.roomPointType !== "Scandic"
      ) {
        total.partnerPoints = total.partnerPoints + room.roomPoints
      }

      if (room.totalPoints) {
        total.scandicPoints = total.scandicPoints + room.totalPoints
      }

      // room.totalPrice is a negative value when
      // its a vouchers booking (╯°□°）╯︵ ┻━┻
      if (room.totalPrice > 0) {
        total.cash = total.cash + room.totalPrice
      }

      return total
    },
    {
      cash: 0,
      cheques: 0,
      scandicPoints: 0,
      partnerPoints: 0,
      vouchers: 0,
    }
  )

  const priceParts: string[] = []
  if (totals.vouchers) {
    priceParts.push(
      `${totals.vouchers} ${intl.formatMessage(
        {
          id: "price.numberOfVouchers",
          defaultMessage:
            "{numberOfVouchers, plural, one {Voucher} other {Vouchers}}",
        },
        {
          numberOfVouchers: totals.vouchers,
        }
      )}`
    )
  }

  if (totals.cheques) {
    priceParts.push(`${totals.cheques} ${CurrencyEnum.CC}`)
  }

  if (totals.partnerPoints) {
    // We can assume that all rooms has the same point type
    const roomPointType = rooms[0]?.roomPointType || PointType.SCANDIC
    const currencyText = getPointsCurrencyText(
      totals.partnerPoints,
      roomPointType,
      intl
    )
    priceParts.push(`${totals.partnerPoints} ${currencyText}`)
  }

  if (totals.scandicPoints) {
    const currencyText = getPointsCurrencyText(
      totals.scandicPoints,
      PointType.SCANDIC,
      intl
    )
    priceParts.push(`${totals.scandicPoints} ${currencyText}`)
  }

  if (totals.cash) {
    const cashPrice = formatPrice(intl, totals.cash, currency)
    priceParts.push(cashPrice)
  }

  return priceParts.join(" + ")
}

export function isAllRoomsCancelled(rooms: Room[]) {
  return !rooms.some((room) => room.isCancelled === false)
}

function getPointsCurrencyText(
  points: number,
  pointsType: PointType,
  intl: IntlShape
) {
  switch (pointsType) {
    case PointType.SCANDIC: {
      return intl.formatMessage(
        {
          id: "price.numberOfScandicPoints",
          defaultMessage:
            "{numberOfScandicPoints, plural, one {Point} other {Points}}",
        },
        {
          numberOfScandicPoints: points,
        }
      )
    }
    case PointType.EUROBONUS: {
      return intl.formatMessage(
        {
          id: "price.numberOfEuroBonusPoints",
          defaultMessage:
            "{numberOfEuroBonusPoints, plural, one {EB Point} other {EB Points}}",
        },
        {
          numberOfEuroBonusPoints: points,
        }
      )
    }
    default: {
      const _exhaustiveCheck: never = pointsType
      return "Points"
    }
  }
}