/**
 * Local (optimistic) admin-moderation store.
 *
 * WHY THIS EXISTS
 * ---------------
 * An admin takedown publishes a kind:1985 `hidden` label so the content is
 * hidden across devices (see useAdminModeration). But publishing that label
 * requires a SECOND Amber approval, which on mobile can be slow or require a
 * second app switch. We must NOT make the delete UI wait on it.
 *
 * So the moment the required kind:5 deletion succeeds, we record the target in
 * this local store. useAdminModeration merges it, so the content disappears
 * from the app immediately on THIS device. The kind:1985 label still publishes
 * in the background for cross-device / other-user persistence.
 *
 * Persisted to localStorage so an optimistic hide survives a reload even if the
 * background label publish hasn't propagated yet.
 */

const STORAGE_KEY = 'skatespots_local_admin_hidden_v1';

interface LocalHidden {
  coords: string[];
  ids: string[];
}

function read(): LocalHidden {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (!raw) return { coords: [], ids: [] };
    const parsed = JSON.parse(raw) as Partial<LocalHidden>;
    return {
      coords: Array.isArray(parsed.coords) ? parsed.coords : [],
      ids: Array.isArray(parsed.ids) ? parsed.ids : [],
    };
  } catch {
    return { coords: [], ids: [] };
  }
}

function write(data: LocalHidden): void {
  try {
    localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
  } catch {
    /* storage full / unavailable — optimistic hide is best-effort */
  }
}

/** Record a coordinate + event id as locally hidden by the admin. */
export function addLocalHidden(opts: { coord?: string; id?: string }): void {
  const data = read();
  if (opts.coord && !data.coords.includes(opts.coord)) data.coords.push(opts.coord);
  if (opts.id && !data.ids.includes(opts.id)) data.ids.push(opts.id);
  write(data);
}

/** Read the current local hidden sets. */
export function getLocalHidden(): { coords: Set<string>; ids: Set<string> } {
  const data = read();
  return { coords: new Set(data.coords), ids: new Set(data.ids) };
}