const CESIUM_PODS = [
  'https://g1.data.brussels.ovh/user/profile/_search',
  'https://g1.data.le-sou.org/user/profile/_search',
  'https://g1.data.e-is.pro/user/profile/_search',
];
const BATCH_SIZE = 500;

export type GeoMember = {
  pubkey: string;
  title: string;
  city: string;
  lat: number;
  lon: number;
};

/** Find the first Cesium+ pod that responds successfully. */
async function findWorkingPod(): Promise<string> {
  for (const url of CESIUM_PODS) {
    try {
      const res = await fetch(url, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ size: 0, query: { match_all: {} } }),
      });
      if (res.ok) return url;
    } catch {
      // try next pod
    }
  }
  throw new Error('Aucun pod Cesium+ disponible');
}

/**
 * Fetch Cesium+ profiles for a given list of v1 pubkeys.
 * Uses Elasticsearch `ids` query with batches of 500, filtered to geolocated profiles only.
 * Pass `null` to skip fetching (e.g. while pubkeys are still loading).
 */
export function useCesiumProfiles(v1Pubkeys: Ref<string[] | null>) {
  const geoMembers = ref<GeoMember[]>([]);
  const loading = ref(true);
  const error = ref<string | null>(null);

  watch(v1Pubkeys, async (pubkeys) => {
    if (pubkeys === null) return;

    loading.value = true;
    error.value = null;

    try {
      const podUrl = await findWorkingPod();
      const allMembers: GeoMember[] = [];

      for (let i = 0; i < pubkeys.length; i += BATCH_SIZE) {
        const batch = pubkeys.slice(i, i + BATCH_SIZE);
        const res = await fetch(podUrl, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            size: batch.length,
            _source: ['title', 'city', 'geoPoint'],
            query: {
              bool: {
                must: [
                  { ids: { values: batch } },
                  { exists: { field: 'geoPoint' } },
                ],
              },
            },
          }),
        });

        if (!res.ok) throw new Error(`Cesium+ HTTP ${res.status}`);
        const json = await res.json();

        for (const hit of json.hits?.hits ?? []) {
          const s = hit._source;
          if (!s?.geoPoint?.lat || !s?.geoPoint?.lon) continue;
          allMembers.push({
            pubkey: hit._id,
            title: s.title || '',
            city: s.city || '',
            lat: s.geoPoint.lat,
            lon: s.geoPoint.lon,
          });
        }
      }

      geoMembers.value = allMembers;
    } catch (e: any) {
      error.value = e.message;
    } finally {
      loading.value = false;
    }
  }, { immediate: true });

  return { geoMembers, loading, error };
}