import deepmerge from "deepmerge"
import { produce } from "immer"
import { useContext } from "react"
import { create, useStore } from "zustand"

import { DetailsContext } from "@/contexts/Details"

import {
  add,
  calcTotalPrice,
  checkRoomProgress,
  extractGuestFromUser,
  getRoomPrice,
  getTotalPrice,
  handleStepProgression,
  selectPreviousSteps,
  selectRoom,
  selectRoomStatus,
  writeToSessionStorage,
} from "./helpers"

import { StepEnum } from "@/types/enums/step"
import type {
  DetailsState,
  InitialState,
  RoomState,
  RoomStatus,
  RoomStep,
} from "@/types/stores/enter-details"
import type { SafeUser } from "@/types/user"

const defaultGuestState = {
  countryCode: "",
  dateOfBirth: "",
  email: "",
  firstName: "",
  join: false,
  lastName: "",
  membershipNo: "",
  phoneNumber: "",
  zipCode: "",
}

export const detailsStorageName = "rooms-details-storage"

export function createDetailsStore(
  initialState: InitialState,
  searchParams: string,
  user: SafeUser
) {
  const isMember = !!user

  const initialTotalPrice = getTotalPrice(
    initialState.rooms.map((r) => r.roomRate),
    isMember
  )

  initialState.rooms.forEach((room) => {
    if (room.roomFeatures) {
      room.roomFeatures.forEach((pkg) => {
        if (initialTotalPrice.requested) {
          initialTotalPrice.requested.price = add(
            initialTotalPrice.requested.price,
            pkg.requestedPrice.totalPrice
          )
        }
        initialTotalPrice.local.price = add(
          initialTotalPrice.local.price,
          pkg.localPrice.totalPrice
        )
      })
    }
  })

  const rooms: RoomState[] = initialState.rooms.map((room, idx) => {
    return {
      ...room,
      adults: initialState.booking.rooms[idx].adults,
      childrenInRoom: initialState.booking.rooms[idx].childrenInRoom,
      bedType: room.bedType,
      breakfast:
        initialState.breakfast === false ? initialState.breakfast : undefined,
      guest: isMember
        ? deepmerge(defaultGuestState, extractGuestFromUser(user))
        : defaultGuestState,
      roomPrice: getRoomPrice(room.roomRate, isMember && idx === 0),
    }
  })

  const roomStatuses: RoomStatus[] = initialState.rooms.map((room, idx) => {
    const steps: RoomStatus["steps"] = {
      [StepEnum.selectBed]: {
        step: StepEnum.selectBed,
        isValid: !!room.bedType,
      },
      [StepEnum.breakfast]: {
        step: StepEnum.breakfast,
        isValid: false,
      },
      [StepEnum.details]: {
        step: StepEnum.details,
        isValid: false,
      },
    }

    if (initialState.breakfast === false) {
      delete steps[StepEnum.breakfast]
    }

    const currentStep =
      idx === 0
        ? Object.values(steps).find((step) => !step.isValid)?.step ??
          StepEnum.selectBed
        : null

    return {
      isComplete: false,
      currentStep: currentStep,
      lastCompletedStep: undefined,
      steps,
    }
  })

  return create<DetailsState>()((set, get) => ({
    searchParamString: searchParams,
    booking: initialState.booking,
    breakfast:
      initialState.breakfast === false ? initialState.breakfast : undefined,
    isSubmittingDisabled: false,
    isSummaryOpen: false,
    isPriceDetailsModalOpen: false,
    totalPrice: initialTotalPrice,
    vat: initialState.vat,
    rooms,
    bookingProgress: {
      currentRoomIndex: 0,
      roomStatuses,
      canProceedToPayment: false,
    },

    actions: {
      setStep(step: StepEnum | null, roomIndex?: number) {
        if (step === null) {
          return
        }

        return set(
          produce((state: DetailsState) => {
            const currentRoomIndex =
              roomIndex ?? state.bookingProgress.currentRoomIndex
            const previousSteps = selectPreviousSteps(state, roomIndex)
            const arePreviousStepsCompleted = Object.values(
              previousSteps
            ).every((step: RoomStep) => step.isValid)
            const arePreviousRoomsCompleted = state.bookingProgress.roomStatuses
              .slice(0, currentRoomIndex)
              .every((room) => room.isComplete)
            const roomStatus = selectRoomStatus(state, roomIndex)

            if (arePreviousRoomsCompleted && arePreviousStepsCompleted) {
              roomStatus.currentStep = step

              if (roomIndex !== undefined) {
                state.bookingProgress.currentRoomIndex = roomIndex
              }
            }
          })
        )
      },
      setIsSubmittingDisabled(isSubmittingDisabled) {
        return set(
          produce((state: DetailsState) => {
            state.isSubmittingDisabled = isSubmittingDisabled
          })
        )
      },
      setTotalPrice(totalPrice) {
        return set(
          produce((state: DetailsState) => {
            state.totalPrice.requested = totalPrice.requested
            state.totalPrice.local = totalPrice.local
          })
        )
      },
      toggleSummaryOpen() {
        return set(
          produce((state: DetailsState) => {
            state.isSummaryOpen = !state.isSummaryOpen
          })
        )
      },
      togglePriceDetailsModalOpen() {
        return set(
          produce((state: DetailsState) => {
            state.isPriceDetailsModalOpen = !state.isPriceDetailsModalOpen
          })
        )
      },
      updateBedType(bedType) {
        return set(
          produce((state: DetailsState) => {
            const roomStatus = selectRoomStatus(state)
            roomStatus.steps[StepEnum.selectBed].isValid = true

            const room = selectRoom(state)
            room.bedType = bedType

            handleStepProgression(state)

            writeToSessionStorage({
              booking: state.booking,
              rooms: state.rooms,
              bookingProgress: state.bookingProgress,
            })
          })
        )
      },
      updateBreakfast(breakfast) {
        return set(
          produce((state: DetailsState) => {
            const roomStatus = selectRoomStatus(state)
            if (roomStatus.steps[StepEnum.breakfast]) {
              roomStatus.steps[StepEnum.breakfast].isValid = true
            }

            const stateTotalRequestedPrice =
              state.totalPrice.requested?.price || 0

            const stateTotalLocalPrice = state.totalPrice.local.price

            const addToTotalPrice =
              (state.breakfast === undefined || state.breakfast === false) &&
              !!breakfast

            const subtractFromTotalPrice =
              (state.breakfast === undefined || state.breakfast) &&
              breakfast === false

            if (addToTotalPrice) {
              const breakfastTotalRequestedPrice = parseInt(
                breakfast.requestedPrice.totalPrice
              )
              const breakfastTotalPrice = parseInt(
                breakfast.localPrice.totalPrice
              )

              state.totalPrice = {
                requested: state.totalPrice.requested && {
                  currency: state.totalPrice.requested.currency,
                  price:
                    stateTotalRequestedPrice + breakfastTotalRequestedPrice,
                },
                local: {
                  currency: breakfast.localPrice.currency,
                  price: stateTotalLocalPrice + breakfastTotalPrice,
                },
              }
            }

            if (subtractFromTotalPrice) {
              let currency = state.totalPrice.local.currency
              let currentBreakfastTotalPrice = 0
              let currentBreakfastTotalRequestedPrice = 0
              if (state.breakfast) {
                currentBreakfastTotalPrice = parseInt(
                  state.breakfast.localPrice.totalPrice
                )
                currentBreakfastTotalRequestedPrice = parseInt(
                  state.breakfast.requestedPrice.totalPrice
                )
                currency = state.breakfast.localPrice.currency
              }

              let requestedPrice =
                stateTotalRequestedPrice - currentBreakfastTotalRequestedPrice
              if (requestedPrice < 0) {
                requestedPrice = 0
              }
              let localPrice = stateTotalLocalPrice - currentBreakfastTotalPrice
              if (localPrice < 0) {
                localPrice = 0
              }

              state.totalPrice = {
                requested: state.totalPrice.requested && {
                  currency: state.totalPrice.requested.currency,
                  price: requestedPrice,
                },
                local: {
                  currency,
                  price: localPrice,
                },
              }
            }

            const room = selectRoom(state)
            room.breakfast = breakfast

            handleStepProgression(state)

            writeToSessionStorage({
              booking: state.booking,
              rooms: state.rooms,
              bookingProgress: state.bookingProgress,
            })
          })
        )
      },
      updateDetails(data) {
        return set(
          produce((state: DetailsState) => {
            const roomStatus = selectRoomStatus(state)
            roomStatus.steps[StepEnum.details].isValid = true

            const room = selectRoom(state)
            room.guest.countryCode = data.countryCode
            room.guest.dateOfBirth = data.dateOfBirth
            room.guest.email = data.email
            room.guest.firstName = data.firstName
            room.guest.join = data.join
            room.guest.lastName = data.lastName

            if (data.join) {
              room.guest.membershipNo = undefined
            } else {
              room.guest.membershipNo = data.membershipNo
            }
            room.guest.phoneNumber = data.phoneNumber
            room.guest.zipCode = data.zipCode

            room.roomPrice = getRoomPrice(
              room.roomRate,
              Boolean(data.join || data.membershipNo || isMember)
            )

            state.totalPrice = calcTotalPrice(
              state.rooms,
              state.totalPrice,
              isMember
            )

            const isAllStepsCompleted = checkRoomProgress(state)
            if (isAllStepsCompleted) {
              roomStatus.isComplete = true
            }

            handleStepProgression(state)

            writeToSessionStorage({
              booking: state.booking,
              rooms: state.rooms,
              bookingProgress: state.bookingProgress,
            })
          })
        )
      },
      updateSeachParamString(searchParamString) {
        return set(
          produce((state: DetailsState) => {
            state.searchParamString = searchParamString
          })
        )
      },
    },
  }))
}

export function useEnterDetailsStore<T>(selector: (store: DetailsState) => T) {
  const store = useContext(DetailsContext)

  if (!store) {
    throw new Error("useEnterDetailsStore must be used within DetailsProvider")
  }

  return useStore(store, selector)
}