saveFieldDetectionCacheForUrl function infrastructure exported ✓ 100.0%

export async function saveFieldDetectionCacheForUrl(
  url: string,
  fields: DetectedFieldSummary[],
): Promise<FieldDetectionCacheEntry> {
  const now = Date.now();
  let parsed: URL | null = null;
  try {
    parsed = new URL(url);
  } catch {
    // keep null and fallback to plain values
  }

  const entry: FieldDetectionCacheEntry = {
    url,
    origin: parsed?.origin ?? "",
    hostname: parsed?.hostname ?? "",
    path: parsed?.pathname ?? "",
    count: fields.length,
    fields,
    updatedAt: now,
  };

  await updateStorageAtomically(
    STORAGE_KEYS.FIELD_CACHE,
    [] as FieldDetectionCacheEntry[],
    (existing) => {
      const filtered = existing.filter(
        (item) =>
          item.url !== url &&
          !(
            entry.origin &&
            entry.path &&
            item.origin === entry.origin &&
            item.path === entry.path
          ),
      );
      filtered.push(entry);

      return filtered
        .sort((a, b) => b.updatedAt - a.updatedAt)
        .slice(0, MAX_FIELD_CACHE_ENTRIES);
    },
  );
  return entry;
}