import isEqual from "fast-deep-equal"

import { detailsStorageName } from "."

import type { RoomRate } from "@/types/components/hotelReservation/enterDetails/details"
import type { Price } from "@/types/components/hotelReservation/price"
import type { SelectRateSearchParams } from "@/types/components/hotelReservation/selectRate/selectRate"
import { StepEnum } from "@/types/enums/step"
import type {
  DetailsState,
  PersistedState,
  RoomState,
  RoomStatus,
} from "@/types/stores/enter-details"
import type { SafeUser } from "@/types/user"

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 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 getRoomPrice(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,
      },
    },
  }
}

type TotalPrice = {
  requested: { currency: string; price: number } | undefined
  local: { currency: string; price: number }
}

export function getTotalPrice(roomRates: RoomRate[], isMember: boolean) {
  return roomRates.reduce<TotalPrice>(
    (total, roomRate, idx) => {
      const isFirstRoom = idx === 0
      const rate =
        isFirstRoom && isMember && roomRate.memberRate
          ? roomRate.memberRate
          : roomRate.publicRate

      return {
        requested: rate.requestedPrice
          ? {
              currency: rate.requestedPrice.currency,
              price: add(
                total.requested?.price ?? 0,
                rate.requestedPrice.pricePerStay
              ),
            }
          : undefined,
        local: {
          currency: rate.localPrice.currency,
          price: add(total.local.price ?? 0, rate.localPrice.pricePerStay),
        },
      }
    },
    {
      requested: undefined,
      local: {
        currency: roomRates[0].publicRate.localPrice.currency,
        price: 0,
      },
    }
  )
}

export function calcTotalPrice(
  rooms: RoomState[],
  totalPrice: Price,
  isMember: boolean
) {
  return rooms.reduce<Price>(
    (acc, room, index) => {
      const isFirstRoomAndMember = index === 0 && isMember
      const join = Boolean(room.guest.join || room.guest.membershipNo)

      const roomPrice = getRoomPrice(
        room.roomRate,
        isFirstRoomAndMember || join
      )

      const breakfastRequestedPrice = room.breakfast
        ? room.breakfast.requestedPrice?.totalPrice ?? 0
        : 0
      const breakfastLocalPrice = room.breakfast
        ? room.breakfast.localPrice?.totalPrice ?? 0
        : 0

      const roomFeaturesTotal = room.roomFeatures?.reduce((total, pkg) => {
        if (pkg.requestedPrice.totalPrice) {
          total = add(total, pkg.requestedPrice.totalPrice)
        }
        return total
      }, 0)

      const result: Price = {
        requested: roomPrice.perStay.requested
          ? {
              currency: roomPrice.perStay.requested.currency,
              price: add(
                acc.requested?.price ?? 0,
                roomPrice.perStay.requested.price,
                breakfastRequestedPrice
              ),
            }
          : undefined,
        local: {
          currency: roomPrice.perStay.local.currency,
          price: add(
            acc.local.price,
            roomPrice.perStay.local.price,
            breakfastLocalPrice,
            roomFeaturesTotal
          ),
        },
      }

      return result
    },
    {
      requested: undefined,
      local: { currency: totalPrice.local.currency, price: 0 },
    }
  )
}

export const selectRoomStatus = (state: DetailsState, index?: number) =>
  state.bookingProgress.roomStatuses[
    index ?? state.bookingProgress.currentRoomIndex
  ]

export const selectRoom = (state: DetailsState, index?: number) =>
  state.rooms[index ?? state.bookingProgress.currentRoomIndex]

export const selectRoomSteps = (state: DetailsState, index?: number) =>
  state.bookingProgress.roomStatuses[
    index ?? state.bookingProgress.currentRoomIndex
  ].steps

export const selectNextStep = (roomStatus: RoomStatus) => {
  if (!roomStatus.currentStep) {
    throw new Error("getNextStep: currentStep is undefined")
  }

  if (!roomStatus.steps[roomStatus.currentStep]?.isValid) {
    return roomStatus.currentStep
  }

  const stepsArray = Object.values(roomStatus.steps)
  const currentIndex = stepsArray.findIndex(
    (step) => step?.step === roomStatus.currentStep
  )
  if (currentIndex === stepsArray.length - 1) {
    return null
  }

  const nextInvalidStep = stepsArray
    .slice(currentIndex + 1)
    .find((step) => !step.isValid)

  return nextInvalidStep?.step ?? null
}

export const selectBookingProgress = (state: DetailsState) =>
  state.bookingProgress

export const checkBookingProgress = (state: DetailsState) => {
  return state.bookingProgress.roomStatuses.every((r) => r.isComplete)
}

export const checkRoomProgress = (state: DetailsState) => {
  const steps = selectRoomSteps(state)
  return Object.values(steps)
    .filter(Boolean)
    .every((step) => step.isValid)
}

export function handleStepProgression(state: DetailsState) {
  const isAllRoomsCompleted = checkBookingProgress(state)
  if (isAllRoomsCompleted) {
    const roomStatus = selectRoomStatus(state)
    roomStatus.currentStep = null
    state.bookingProgress.canProceedToPayment = true
    return
  }

  const roomStatus = selectRoomStatus(state)
  if (roomStatus.isComplete) {
    const nextRoomIndex = state.bookingProgress.currentRoomIndex + 1

    roomStatus.lastCompletedStep = roomStatus.currentStep ?? undefined
    roomStatus.currentStep = null
    const nextRoomStatus = selectRoomStatus(state, nextRoomIndex)
    nextRoomStatus.currentStep =
      Object.values(nextRoomStatus.steps).find((step) => !step.isValid)?.step ??
      StepEnum.selectBed

    const nextStep = selectNextStep(nextRoomStatus)
    nextRoomStatus.currentStep = nextStep
    state.bookingProgress.currentRoomIndex = nextRoomIndex
    return
  }

  const nextStep = selectNextStep(roomStatus)
  if (nextStep && roomStatus.currentStep) {
    roomStatus.lastCompletedStep = roomStatus.currentStep
    roomStatus.currentStep = nextStep
    return
  }
}

export function readFromSessionStorage(): PersistedState | undefined {
  if (typeof window === "undefined") {
    return undefined
  }

  try {
    const storedData = sessionStorage.getItem(detailsStorageName)
    if (!storedData) {
      return undefined
    }

    const parsedData = JSON.parse(storedData) as PersistedState

    if (
      !parsedData.booking ||
      !parsedData.rooms ||
      !parsedData.bookingProgress
    ) {
      return undefined
    }

    return parsedData
  } catch (error) {
    console.error("Error reading from session storage:", error)
    return undefined
  }
}

export function writeToSessionStorage(state: PersistedState) {
  if (typeof window === "undefined") {
    return
  }

  try {
    sessionStorage.setItem(detailsStorageName, JSON.stringify(state))
  } catch (error) {
    console.error("Error writing to session storage:", error)
  }
}

export function clearSessionStorage() {
  if (typeof window === "undefined") {
    return
  }
  sessionStorage.removeItem(detailsStorageName)
}