importDatasetEntries function exported ✓ 100.0%

export async function importDatasetEntries(
  entries: Array<
    Omit<DatasetEntry, "id" | "createdAt"> & { id?: string; createdAt?: number }
  >,
): Promise<number> {
  const existing = await getDatasetEntries();
  const existingKeys = new Set(existing.map((e) => `${e.signals}::${e.type}`));

  let added = 0;
  const toAdd: DatasetEntry[] = [];

  for (const raw of entries) {
    const normalized = normalise(raw.signals);
    if (!normalized) continue;
    const key = `${normalized}::${raw.type}`;
    if (existingKeys.has(key)) continue;

    toAdd.push({
      id: raw.id ?? generateId(),
      signals: normalized,
      type: raw.type,
      source: raw.source ?? "imported",
      difficulty: raw.difficulty ?? "easy",
      createdAt: raw.createdAt ?? Date.now(),
    });
    existingKeys.add(key);
    added++;
  }

  if (added > 0) {
    await chrome.storage.local.set({
      [RUNTIME_DATASET_KEY]: [...existing, ...toAdd],
    });
  }

  return added;
}