package foundation.user;

import foundation.token.IOnlineUser;
import foundation.token.IUserManager;
import foundation.token.UserToken;
import foundation.util.Util;
import foundation.variant.provider.VariantCenter;

public class UserManager extends IUserManager {

	private static UserManager instance;
	
	private UserManager() {
		VariantCenter center = VariantCenter.getInstance();
		center.registTransiant(User.VariantNames, User.ProviderName, User.class);
	}
	
	public static synchronized UserManager getInstance() {
		if (instance == null) {
			instance = new UserManager();
		}
		
		return instance;
	}
	
	
	@Override
	public IOnlineUser createUser(String token) {
		UserToken userToken = UserToken.getInstance(token); 
		
		String userId = userToken.getUserId();
		String onlineCode = userToken.getOnlineCode();
		
		if (Util.isEmpty(userId) || (!userToken.validate())) {
			return null;
		}
				
		User user = User.getInstance(userId);
		
		if (user == null) {
			return null;
		}
		
		IOnlineUser onlineUser = new OnlineUser(onlineCode, user);
		IOnlineUser.setLocal(onlineUser);
		
		return onlineUser;
	}

	@Override
	public IOnlineUser getUser() {
		return OnlineUser.getInstance();
	}

}