// src/hooks/queries/useFlyerItemCountQuery.ts
import { useQuery } from '@tanstack/react-query';
import { countFlyerItemsForFlyers } from '../../services/apiClient';
import { queryKeys } from '../../config/queryKeys';

interface FlyerItemCount {
  count: number;
}

/**
 * Query hook for counting total flyer items across multiple flyers.
 *
 * This is used to display the total number of active deals available.
 *
 * @param flyerIds - Array of flyer IDs to count items for
 * @param enabled - Whether the query should run
 * @returns Query result with count data
 *
 * @example
 * ```tsx
 * const { data } = useFlyerItemCountQuery(validFlyerIds, validFlyerIds.length > 0);
 * const totalItems = data?.count ?? 0;
 * ```
 */
export const useFlyerItemCountQuery = (flyerIds: number[], enabled: boolean = true) => {
  return useQuery({
    // Include flyerIds in the key so cache is per-set of flyers
    queryKey: queryKeys.flyerItemsCount(flyerIds),
    queryFn: async (): Promise<FlyerItemCount> => {
      if (flyerIds.length === 0) {
        return { count: 0 };
      }

      const response = await countFlyerItemsForFlyers(flyerIds);

      if (!response.ok) {
        const error = await response.json().catch(() => ({
          message: `Request failed with status ${response.status}`,
        }));
        throw new Error(error.message || 'Failed to count flyer items');
      }

      const json = await response.json();
      // API returns { success: true, data: {...} }, extract the data object
      return json.data ?? json;
    },
    enabled: enabled && flyerIds.length > 0,
    // Count doesn't change frequently
    staleTime: 1000 * 60 * 5, // 5 minutes
  });
};
