import { useQuery } from '@tanstack/react-query';
import { useSkateRelays } from '@/hooks/useSkateRelays';
import {
  SKATE_CREW_KIND,
  SKATE_SPOT_KIND,
  parseSkateCrew,
  type SkateCrew,
} from '@/lib/types';

/**
 * Reverse link: which crews list this spot as a home spot?
 *
 * Crews store home spots as `a` tags (`30818:pubkey:d`). We query crews whose
 * `a` tag references this spot coordinate, so a spot page can show
 * "Crews that skate here".
 */
export function useCrewsForSpot(spotPubkey?: string, spotIdentifier?: string, limit = 20) {
  const { querySkateContent, getQueryKeySuffix } = useSkateRelays();
  const spotCoord =
    spotPubkey && spotIdentifier
      ? `${SKATE_SPOT_KIND}:${spotPubkey}:${spotIdentifier}`
      : '';

  return useQuery({
    queryKey: ['crews-for-spot', spotCoord, getQueryKeySuffix()],
    enabled: !!spotCoord,
    staleTime: 5 * 60 * 1000,
    gcTime: 30 * 60 * 1000,
    queryFn: async () => {
      const signal = AbortSignal.timeout(10000);
      const events = await querySkateContent(
        [{ kinds: [SKATE_CREW_KIND], '#a': [spotCoord], limit }],
        { signal },
      );

      const crews: SkateCrew[] = [];
      for (const ev of events) {
        const crew = parseSkateCrew(ev);
        // Guard: relay `#a` matching can be loose — confirm the ref is present.
        if (crew && crew.spotRefs.includes(spotCoord)) crews.push(crew);
      }
      return crews.sort((a, b) => b.members.length - a.members.length);
    },
  });
}