package org.springside.examples.miniservice.service.user;

import java.util.List;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springside.examples.miniservice.entity.user.Role;
import org.springside.examples.miniservice.entity.user.User;
import org.springside.modules.orm.hibernate.SimpleHibernateTemplate;

/**
 * 整個User模塊內的業務邏輯Facade類.
 * 組合user,role兩者的DAO.DAO均直接使用泛型的SimpleHibernateTemplate.
 * 使用Spring的@Service/@Autowired 指定IOC設置.
 * 使用Spring的@Transactional指定事務管理.
 * 
 * @author calvin
 */
@Service
@Transactional
public class UserManager {

	private static String AUTH_HQL = "select count(u) from User u where u.loginName=? and u.password=?";

	private SimpleHibernateTemplate<User, Long> userDao;

	private SimpleHibernateTemplate<Role, Long> roleDao;

	@Autowired
	public void setSessionFactory(SessionFactory sessionFactory) {
		userDao = new SimpleHibernateTemplate<User, Long>(sessionFactory, User.class);
		roleDao = new SimpleHibernateTemplate<Role, Long>(sessionFactory, Role.class);
	}

	@Transactional(readOnly = true)
	public User getUser(Long id) {
		return userDao.get(id);
	}

	@Transactional(readOnly = true)
	public List<User> getAllUser() {
		return userDao.findAll();
	}

	@Transactional(readOnly = true)
	public List<Role> getAllRole() {
		return roleDao.findAll();
	}

	public void saveUser(User user) {
		userDao.save(user);
	}

	public void deleteUser(User user) {
		userDao.delete(user);
	}

	/**
	 * 驗證用戶名密碼. 
	 * 
	 * @return 驗證通過時返回true.用戶名或密碼錯誤返回false.
	 */
	@Transactional(readOnly = true)
	public boolean auth(String loginName, String password) {
		if (!StringUtils.hasText(loginName) || !StringUtils.hasText(password))
			return false;

		return (userDao.findLong(AUTH_HQL, loginName, password) == 1);
	}
}