package util;
import java.util.Properties;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;



public class HibernateUtil {

    //XML based configuration
    private static SessionFactory sessionFactory;


    //Property based configuration
    private static SessionFactory sessionJavaConfigFactory;

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            Configuration configuration = new Configuration();
            configuration.configure("hibernate.cfg.xml");
            System.out.println("Hibernate Configuration loaded");

            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
            System.out.println("Hibernate serviceRegistry created");

            SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

            return sessionFactory;
        }
        catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }




    private static SessionFactory buildSessionJavaConfigFactory() {
        try {
            Configuration configuration = new Configuration();

            //Create Properties, can be read from property files too
            Properties props = new Properties();
            props.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
            props.put("hibernate.connection.url", "jdbc:mySql:thin://localhost:3306/dblibrary");
            props.put("hibernate.connection.username", "Antonio");
            props.put("hibernate.connection.password", "2qxonFfQgUe5vSFt");
            props.put("hibernate.current_session_context_class", "thread");

            configuration.setProperties(props);



            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
            System.out.println("Hibernate Java Config serviceRegistry created");

            SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

            return sessionFactory;
        }
        catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        if(sessionFactory == null) sessionFactory = buildSessionFactory();
        return sessionFactory;
    }


    public static SessionFactory getSessionJavaConfigFactory() {
        if(sessionJavaConfigFactory == null) sessionJavaConfigFactory = buildSessionJavaConfigFactory();
        return sessionJavaConfigFactory;
    }

}