import {
  type HotelListingHotelData,
  type HotelSortItem,
  HotelSortOption,
} from "@scandic-hotels/trpc/types/hotel"

import type { DestinationCityListItem } from "@scandic-hotels/trpc/types/destinationCityPage"

const HOTEL_SORTING_STRATEGIES: Partial<
  Record<
    HotelSortOption,
    (a: HotelListingHotelData, b: HotelListingHotelData) => number
  >
> = {
  [HotelSortOption.Name]: function (a, b) {
    return a.hotel.name.localeCompare(b.hotel.name)
  },
  [HotelSortOption.TripAdvisorRating]: function (a, b) {
    return (b.hotel.tripadvisor ?? 0) - (a.hotel.tripadvisor ?? 0)
  },
  [HotelSortOption.Distance]: function (a, b) {
    return a.hotel.location.distanceToCentre - b.hotel.location.distanceToCentre
  },
}

export function getFilteredHotels(
  hotels: HotelListingHotelData[],
  filters: string[]
) {
  if (filters.length) {
    return hotels.filter(({ hotel }) =>
      filters.every((filter) =>
        hotel.detailedFacilities.some((facility) => facility.slug === filter)
      )
    )
  }
  return hotels
}

export function getFilteredCities(
  filteredHotels: HotelListingHotelData[],
  cities: DestinationCityListItem[]
) {
  const filteredCityIdentifiers = filteredHotels.map(
    (hotel) => hotel.hotel.cityIdentifier
  )

  return cities.filter(
    (city) =>
      city.destination_settings.city &&
      filteredCityIdentifiers.includes(city.destination_settings.city)
  )
}

export function getSortedHotels(
  hotels: HotelListingHotelData[],
  sortOption: HotelSortOption
) {
  const sortFn = HOTEL_SORTING_STRATEGIES[sortOption]
  return sortFn ? [...hotels].sort(sortFn) : hotels
}

export function isValidSortOption(
  value: string,
  sortItems: HotelSortItem[]
): value is HotelSortOption {
  return sortItems.map((item) => item.value).includes(value as HotelSortOption)
}

export function getBasePathNameWithoutFilters(
  pathname: string,
  filterSlugs: string[]
) {
  if (!filterSlugs.length) {
    return pathname
  }

  const lastSlashIndex = pathname.lastIndexOf("/")
  const lastSegment = pathname.slice(lastSlashIndex + 1)

  if (filterSlugs.includes(lastSegment)) {
    return pathname.slice(0, lastSlashIndex) || "/"
  }

  return pathname
}