package springbook.user.service;

import java.util.List;

import springbook.user.dao.UserDao;
import springbook.user.domain.Level;
import springbook.user.domain.User;

public class UserService {
	public static final int MIN_LOGCOUNT_FOR_SILVER = 50;
	public static final int MIN_RECCOMEND_FOR_GOLD = 30;

	private UserDao userDao;

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	
	public void upgradeLevels() {
		List<User> users = userDao.getAll();  
		for(User user : users) {  
			if (canUpgradeLevel(user)) {  
				upgradeLevel(user);  
			}
		}
	}
	private boolean canUpgradeLevel(User user) {
		Level currentLevel = user.getLevel(); 
		switch(currentLevel) {                                   
		case BASIC: return (user.getLogin() >= MIN_LOGCOUNT_FOR_SILVER); 
		case SILVER: return (user.getRecommend() >= MIN_RECCOMEND_FOR_GOLD);
		case GOLD: return false;
		default: throw new IllegalArgumentException("Unknown Level: " + currentLevel); 
		}
	}

	private void upgradeLevel(User user) {
		user.upgradeLevel();
		userDao.update(user);
	}
	
	public void add(User user) {
		if (user.getLevel() == null) user.setLevel(Level.BASIC);
		userDao.add(user);
	}

}