export const INITIAL_SYNC_PENDING_DEVICE_KEY =
  "peach_initial_sync_pending_device_id";

export interface InitialSyncDevice {
  deviceId: string;
  lastSyncedAt?: number;
}

/**
 * Pairing persists identity and vault-key material before the first entry sync.
 * A receiver is ready to reveal its vault only after the newly paired source
 * has completed a real sync round, recorded by its durable lastSyncedAt.
 */
export function hasCompletedInitialSync(
  devices: InitialSyncDevice[],
  pendingDeviceId: string,
): boolean {
  return devices.some(
    (device) =>
      device.deviceId === pendingDeviceId &&
      typeof device.lastSyncedAt === "number",
  );
}