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

import { HotelDataContext } from "@/contexts/HotelData"

import {
  getBasePathNameWithoutFilters,
  getFilteredHotels,
  getFiltersFromHotels,
  getSortedHotels,
  isValidSortOption,
} from "./helper"

import type { Filter } from "@/types/components/hotelFilterAndSort"
import { SortOption } from "@/types/enums/hotelFilterAndSort"
import type { HotelDataState, InitialState } from "@/types/stores/hotel-data"

export function createHotelDataStore({
  allHotels,
  searchParams,
  pathname,
  filterFromUrl,
  sortItems,
  submitCallbackFn,
}: InitialState) {
  const sortFromSearchParams = searchParams.get("sort")
  const initialFilters = filterFromUrl ? [filterFromUrl] : []
  let initialSort = SortOption.Distance
  if (
    sortFromSearchParams &&
    isValidSortOption(sortFromSearchParams, sortItems)
  ) {
    initialSort = sortFromSearchParams
  }
  const initialFilteredHotels = getFilteredHotels(allHotels, initialFilters)
  const initialActiveHotels = getSortedHotels(
    initialFilteredHotels,
    initialSort
  )
  const allFilters = getFiltersFromHotels(allHotels)
  const allFilterSlugs = Object.values(allFilters).flatMap((filter: Filter[]) =>
    filter.map((f) => f.slug)
  )

  return create<HotelDataState>((set) => ({
    actions: {
      submitFiltersAndSort() {
        return set(
          produce((state: HotelDataState) => {
            const sort = state.pendingSort
            const filters = state.pendingFilters
            const filteredHotels = getFilteredHotels(state.allHotels, filters)
            const sortedHotels = getSortedHotels(filteredHotels, sort)

            state.activeSort = sort
            state.activeFilters = state.pendingFilters
            state.activeHotels = sortedHotels
            state.pendingCount = filteredHotels.length

            if (submitCallbackFn) {
              submitCallbackFn({
                sort,
                filters,
                basePath: state.basePathnameWithoutFilters,
              })
            }
          })
        )
      },
      setPendingSort(sort) {
        return set(
          produce((state: HotelDataState) => {
            state.pendingSort = sort
          })
        )
      },
      togglePendingFilter(filter) {
        return set(
          produce((state: HotelDataState) => {
            const isActive = state.pendingFilters.includes(filter)
            const filters = isActive
              ? state.pendingFilters.filter((f) => f !== filter)
              : [...state.pendingFilters, filter]
            const pendingHotels = getFilteredHotels(state.allHotels, filters)

            state.pendingFilters = filters
            state.pendingCount = pendingHotels.length
          })
        )
      },
      clearPendingFilters() {
        return set(
          produce((state: HotelDataState) => {
            state.pendingFilters = []
            state.pendingCount = state.allHotels.length
          })
        )
      },
      resetPendingValues() {
        return set(
          produce((state: HotelDataState) => {
            state.pendingFilters = state.activeFilters
            state.pendingSort = state.activeSort
            state.pendingCount = state.activeHotels.length
          })
        )
      },
      loadInitialHashFilter(hash) {
        return set(
          produce((state: HotelDataState) => {
            state.initialHashFilterLoaded = true

            const filters = []
            const filtersFromHash = hash.split("&").filter(Boolean) ?? []
            if (filterFromUrl) {
              filters.push(filterFromUrl, ...filtersFromHash)
            }
            const filteredHotels = getFilteredHotels(state.allHotels, filters)
            const sortedHotels = getSortedHotels(
              filteredHotels,
              state.activeSort
            )
            state.activeHotels = sortedHotels
            state.activeFilters = filters
            state.pendingFilters = filters
            state.pendingCount = filteredHotels.length
          })
        )
      },
    },
    allHotels,
    activeHotels: initialActiveHotels,
    pendingCount: initialActiveHotels.length,
    activeSort: initialSort,
    pendingSort: initialSort,
    activeFilters: initialFilters,
    pendingFilters: initialFilters,
    searchParams,
    allFilters,
    allFilterSlugs,
    basePathnameWithoutFilters: getBasePathNameWithoutFilters(
      pathname,
      allFilterSlugs
    ),
    sortItems,
    initialHashFilterLoaded: false,
  }))
}

export function useHotelDataStore<T>(selector: (store: HotelDataState) => T) {
  const store = useContext(HotelDataContext)

  if (!store) {
    throw new Error("useHotelDataStore must be used within HotelDataProvider")
  }

  return useStore(store, selector)
}