/** Keep rows on or before the dashboard publish cutoff date (ISO `YYYY-MM-DD`). */
export function throughVisibleDate<T extends { date: string }>(
  rows: T[],
  visibleThrough: string | null | undefined
): T[] {
  if (!visibleThrough) return rows;
  return rows.filter((row) => row.date <= visibleThrough);
}

/** True when `date` is on or before the publish cutoff (or cutoff is unknown). */
export function isOnOrBeforeVisibleDate(
  date: string | null | undefined,
  visibleThrough: string | null | undefined
): boolean {
  if (!date) return false;
  if (!visibleThrough) return true;
  return date <= visibleThrough;
}