Zona informaticienilor

package com.exercitiu.bean;

import com.exercitiu.model.User;
//import com.exercitiu.service.UserService;
import javax.inject.Named; // Folosim CDI
import javax.enterprise.context.SessionScoped; // Folosim CDI
import javax.persistence.*;
import java.io.Serializable;
import java.util.List;

@Named(value = "userBean")
@SessionScoped
public class UserBean implements Serializable {

    private String username;
    private String password;
    private User loggedUser;

    // Factory-ul poate fi static
    private static final EntityManagerFactory emf = Persistence.createEntityManagerFactory("myPU");

    public UserBean() {}

    public String login() {
        // Creăm EntityManager-ul doar când avem nevoie de el
        EntityManager em = emf.createEntityManager();
        try {
            TypedQuery<User> query = em.createQuery(
                    "SELECT u FROM User u WHERE u.username=:username AND u.password=:password", User.class);
            query.setParameter("username", username);
            query.setParameter("password", password);

            List<User> result = query.getResultList();

            if (result.isEmpty()) return "login?faces-redirect=true&error=true";

            loggedUser = result.get(0);
            return "dashboard?faces-redirect=true";
        } catch (Exception e) {
            e.printStackTrace();
            return "login?faces-redirect=true&error=exception";
        } finally {
            em.close(); // Foarte important să îl închizi!
        }
    }
    public String register() {
        EntityManager em = emf.createEntityManager();
        try {
            em.getTransaction().begin();

            User newUser = new User();
            newUser.setUsername(this.username);
            newUser.setPassword(this.password);

            em.persist(newUser);
            em.getTransaction().commit();

            return "login?faces-redirect=true";
        } catch (Exception e) {
            if (em.getTransaction().isActive()) {
                em.getTransaction().rollback();
            }
            e.printStackTrace();
            return "register?faces-redirect=true&error=exception";
        } finally {
            em.close();
        }
    }
    public String logout() {
        loggedUser = null;
        username = null;
        password = null;
        return "login?faces-redirect=true";
    }

    // Getters / Setters (Rămân la fel)
    public String getUsername() { return username; }
    public void setUsername(String username) { this.username = username; }
    public String getPassword() { return password; }
    public void setPassword(String password) { this.password = password; }
    public User getLoggedUser() { return loggedUser; }
}