/**
 * Gift-wrap ids created by this device. NIP-17 sends a copy to the sender, and
 * envelope-only unread counts can't distinguish that copy from an incoming
 * message without decrypting. Tracking outbound wrap ids keeps the decrypt-free
 * bell badge honest.
 */
const KEY = 'skatespots:dm-own-wraps';
const MAX = 500;

function read(): string[] {
  try {
    const raw = localStorage.getItem(KEY);
    const parsed = raw ? JSON.parse(raw) as unknown : [];
    return Array.isArray(parsed) ? parsed.filter((id): id is string => typeof id === 'string') : [];
  } catch {
    return [];
  }
}

export function markOwnDmWraps(ids: string[]): void {
  try {
    const next = [...new Set([...ids, ...read()])].slice(0, MAX);
    localStorage.setItem(KEY, JSON.stringify(next));
  } catch {
    // best-effort only
  }
}

export function getOwnDmWrapIds(): Set<string> {
  return new Set(read());
}