/**
 * Device-local optimistic mutes.
 *
 * Publishing a NIP-51 kind-10000 mute list is a signed action, and the relay
 * may not hand it back immediately. Keeping the just-muted pubkeys here means
 * the mute takes effect on this device at once and survives a reload until the
 * published list is read back. The relay list remains the source of truth; this
 * is only an overlay (mirrors `localModeration` / `localDeletions`).
 */

const STORAGE_KEY = 'skatespots:local-mutes-v1';

function read(): string[] {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (!raw) return [];
    const parsed = JSON.parse(raw);
    return Array.isArray(parsed) ? (parsed as string[]) : [];
  } catch {
    return [];
  }
}

function write(list: string[]): void {
  try {
    localStorage.setItem(STORAGE_KEY, JSON.stringify([...new Set(list)]));
  } catch {
    /* storage full / unavailable — best-effort */
  }
}

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

export function addLocalMute(pubkey: string): void {
  if (!pubkey) return;
  const list = read();
  list.push(pubkey);
  write(list);
}

export function removeLocalMute(pubkey: string): void {
  write(read().filter((pk) => pk !== pubkey));
}