export function timeAgo(timestamp: number): string {
  const seconds = Math.floor(Date.now() / 1000 - timestamp);

  if (seconds < 60) return `${seconds}s`;
  if (seconds < 3600) return `${Math.floor(seconds / 60)}m`;
  if (seconds < 86400) return `${Math.floor(seconds / 3600)}h`;
  if (seconds < 604800) return `${Math.floor(seconds / 86400)}d`;
  return `${Math.floor(seconds / 604800)}w`;
}

export function shortenPubkey(pubkey: string): string {
  return pubkey.slice(0, 8) + "…" + pubkey.slice(-4);
}

/** Safely extract display name from a Nostr profile (handles non-string values from malformed profiles). */
export function profileName(profile: any, fallback: string): string {
  const raw = profile?.displayName || profile?.name;
  return (typeof raw === "string" ? raw : null) || fallback;
}