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,
} 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 checkIsSameBooking(
  prev: SelectRateSearchParams & { errorCode?: string },
  next: SelectRateSearchParams & { errorCode?: string }
) {
  const { rooms: prevRooms, errorCode: prevErrorCode, ...prevBooking } = prev

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

  const nextRoomsWithoutRateCodes = nextRooms.map(
    ({ rateCode, counterRateCode, roomTypeCode, ...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,
        },
      },
    }
  }

  if (roomRate.publicRate) {
    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,
          regularPrice: roomRate.publicRate.localPrice.regularPricePerNight,
        },
      },
      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,
          regularPrice: roomRate.publicRate.localPrice.regularPricePerStay,
        },
      },
    }
  }

  throw new Error(
    `Unable to calculate RoomPrice since user is neither a member or memberRate is missing, or publicRate is missing`
  )
}

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

      if (!rate) {
        return total
      }

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

export function calcTotalPrice(
  rooms: RoomState[],
  currency: Price["local"]["currency"],
  isMember: boolean,
  nights: number
) {
  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
      )

      if (!roomPrice) {
        return acc
      }

      const breakfastRequestedPrice = room.breakfast
        ? parseInt(room.breakfast.requestedPrice?.price ?? 0)
        : 0
      const breakfastLocalPrice = room.breakfast
        ? parseInt(room.breakfast.localPrice?.price ?? 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 * room.adults * nights
              ),
            }
          : undefined,
        local: {
          currency: roomPrice.perStay.local.currency,
          price: add(
            acc.local.price,
            roomPrice.perStay.local.price,
            breakfastLocalPrice * room.adults * nights,
            roomFeaturesTotal
          ),
          regularPrice: add(
            acc.local.regularPrice,
            roomPrice.perStay.local.regularPrice,
            breakfastLocalPrice * room.adults * nights,
            roomFeaturesTotal
          ),
        },
      }

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

export function getFirstInteractiveStepOfRoom(room: RoomState["room"]) {
  if (!room.bedType) {
    return StepEnum.selectBed
  }
  if (room.breakfast !== false) {
    return StepEnum.breakfast
  }
  return StepEnum.details
}

export function findNextInvalidStep(roomState: RoomState) {
  return (
    Object.values(roomState.steps).find((stp) => !stp.isValid)?.step ??
    getFirstInteractiveStepOfRoom(roomState.room)
  )
}

export const selectNextStep = (room: RoomState) => {
  if (room.currentStep === null) {
    throw new Error("getNextStep: currentStep is null")
  }

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

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

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

  return nextInvalidStep?.step ?? null
}

export const checkRoomProgress = (steps: RoomState["steps"]) => {
  return Object.values(steps)
    .filter(Boolean)
    .every((step) => step.isValid)
}

export function handleStepProgression(room: RoomState, state: DetailsState) {
  const isAllRoomsCompleted = state.rooms.every((r) => r.isComplete)
  if (isAllRoomsCompleted) {
    room.currentStep = null
    state.canProceedToPayment = true
  } else if (room.isComplete) {
    room.currentStep = null
    const nextRoomIndex = state.rooms.findIndex((r) => !r.isComplete)
    state.activeRoom = nextRoomIndex

    const nextRoom = state.rooms[nextRoomIndex]
    const nextStep = selectNextStep(nextRoom)
    nextRoom.currentStep = nextStep
  } else if (selectNextStep(room)) {
    room.currentStep = selectNextStep(room)
  }
}

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) {
      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)
}