import type { NurseSearchFilters } from './types';

/**
 * React Query key factory for the search domain.
 *
 * **The filter object IS the query key** (phase §5, the caching contract). `results(filters)` keys on a
 * **canonical** serialization of the full filter object — a stable key order with every *absent* optional
 * filter omitted (never carried as `undefined`). Two filter sets that are semantically equal therefore
 * produce the identical key, so changing a filter and **reverting** to a previous set is a cache hit with
 * zero network calls (React Query hashes query keys deterministically; canonicalizing here makes the
 * intent explicit and keeps the URL/query-param serialization aligned with the cache key).
 */

/** Canonical, order-stable filter object with absent optionals omitted (the cache key + query params). */
export function canonicalizeSearchFilters(filters: NurseSearchFilters): Record<string, string | number> {
  const canonical: Record<string, string | number> = {
    serviceCategoryId: filters.serviceCategoryId,
    cityId: filters.cityId,
    sort: filters.sort,
    page: filters.page,
    pageSize: filters.pageSize,
  };
  if (filters.districtId != null) canonical.districtId = filters.districtId;
  if (filters.nurseGender != null) canonical.nurseGender = filters.nurseGender;
  if (filters.priceMin != null && filters.priceMin !== '') canonical.priceMin = filters.priceMin;
  if (filters.priceMax != null && filters.priceMax !== '') canonical.priceMax = filters.priceMax;
  if (filters.priceUnit != null) canonical.priceUnit = filters.priceUnit;
  return canonical;
}

export const searchKeys = {
  all: ['search'] as const,
  results: (filters: NurseSearchFilters) =>
    [...searchKeys.all, 'results', canonicalizeSearchFilters(filters)] as const,
  profiles: () => [...searchKeys.all, 'profile'] as const,
  profile: (nurseId: number) => [...searchKeys.profiles(), nurseId] as const,
};