private void HandleAddOwner(ChatUser user, string[] parts)
{
if (parts.Length == 1)
{
throw new InvalidOperationException("Who do you want to make an owner?");
}
string targetUserName = parts[1];
ChatUser targetUser = _repository.VerifyUser(targetUserName);
if (parts.Length == 2)
{
throw new InvalidOperationException("Which room?");
}
string roomName = parts[2];
ChatRoom targetRoom = _repository.VerifyRoom(roomName);
_chatService.AddOwner(user, targetUser, targetRoom);
_notificationService.AddOwner(targetUser, targetRoom);
_repository.CommitChanges();
}