import { nip19 } from 'nostr-tools';

// Relays and the rest of the app key identities by lowercase hex pubkeys.
// Pubkeys may arrive as npub/nprofile, so normalize them to hex. Returns null
// when the input cannot be interpreted as a pubkey.
export function toHexPubkey(pubkey: string | null | undefined): string | null {
  if (!pubkey) return null;
  const trimmed = pubkey.trim();
  if (/^[0-9a-f]{64}$/i.test(trimmed)) return trimmed.toLowerCase();
  try {
    const decoded = nip19.decode(trimmed);
    if (decoded.type === 'npub') return decoded.data as string;
    if (decoded.type === 'nprofile') return (decoded.data as { pubkey: string }).pubkey;
  } catch {
    // fall through
  }
  return null;
}

// Normalizes to hex when possible, otherwise returns the trimmed original so we
// never silently drop an identity we cannot decode.
export function normalizePubkey(pubkey: string): string {
  return toHexPubkey(pubkey) ?? pubkey.trim();
}