const SAFE_TAB_ID_RE = /^[A-Za-z0-9_-]{1,96}$/;

export function normalizeBrowserTabId(value: unknown): string | null {
  if (typeof value !== "string") return null;
  const trimmed = value.trim();
  return SAFE_TAB_ID_RE.test(trimmed) ? trimmed : null;
}

export function appStateKeyForBrowserTab(
  key: string,
  browserTabId: unknown,
): string {
  const normalized = normalizeBrowserTabId(browserTabId);
  return normalized ? `${key}:${normalized}` : key;
}