import org.apache.struts.action.*;
import javax.servlet.http.*;

import java.io.IOException;
import javax.servlet.ServletException;
import java.util.ArrayList;

import org.hibernate.*;
import org.hibernate.cfg.*;

/**
 * @author Chao Wu
 * 
 * Description: This class is a Struts Action class used to do the validation
 * work and login to the system.
 * <p>
 * 
 * Copyright:
 * <p>
 */
public class LoginAction extends Action {

	/**
	 * This method deals with the actions need to login
	 * 
	 * @param mapping
	 * @param form
	 * @param req
	 * @param res
	 * @return
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest req, HttpServletResponse res)
			throws IOException, ServletException {

		LoginForm loginForm = (LoginForm) form;

		// Get the username and password from user input
		String username = loginForm.getUsername();
		String password = loginForm.getPassword();

		try {
			SessionFactory sf = new Configuration().configure()
					.buildSessionFactory();
			Session session = sf.openSession();
			Transaction tx = session.beginTransaction();

			// Select the users from database with the username
			String sqlQuery = "select u from User u where u.username='"
					+ username + "'";
			Query lQuery = session.createQuery(sqlQuery);
			ArrayList userList = (ArrayList) lQuery.list();
			tx.commit();
			session.close();

			User user = new User();

			// There is such a user
			if ((null != userList) && (userList.size() > 0)) {
				user = (User) userList.get(0);
				if (!user.getPassword().equals(password)) {
					return mapping.findForward("failure");
				}
			} else {
				// There is no such user
				return mapping.findForward("failure");
			}

		} catch (HibernateException e) {
			e.printStackTrace();
			return mapping.findForward("failure");
		}
		
		HttpSession httpSession = req.getSession();
		httpSession.setAttribute("buylist", new ArrayList());
		Double totalprice = new Double(0);
		httpSession.setAttribute("totalprice", totalprice);
		// Successfully login
		return mapping.findForward("success");

	}

}