/**
 * Environment variable helpers.
 */

/**
 * Parse a staleness window from an env var string (interpreted as hours).
 * Falls back to `defaultHours` when the value is missing, non-numeric,
 * non-finite, or <= 0 — preventing NaN from silently breaking staleness checks.
 */
export function parseStalenessHours(envVar: string | undefined, defaultHours: number): number {
  const parsed = parseInt(envVar ?? "", 10);
  return Number.isFinite(parsed) && parsed > 0 ? parsed : defaultHours;
}