package com.weecode.plugin.comics.model;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.Query;

import org.eclipse.persistence.internal.jpa.EntityManagerImpl;
import org.eclipse.persistence.sessions.UnitOfWork;

import com.weecode.plugin.comics.model.emf.ComicsEntityManagerFactory;
import com.weecode.plugin.comics.model.eo.Publisher;
import com.weecode.plugin.comics.model.eo.Title;
/**
 * 
 * @author Jason Kusnier and Tim Hollosy
 *
 */
public class TitlesModel {
	private EntityManager em;
	
	private List<Title> titles = new ArrayList<Title>();
	private List<Publisher> publishers = new ArrayList<Publisher>();
	
	private EntityTransaction transaction;
	
	public TitlesModel() {
		em = ComicsEntityManagerFactory.createEntityManager();
		transaction = em.getTransaction();
		transaction.begin();
		readTitles();
		readPublishers();
	}
	
	public void close() {
		em.close();
	}
	

	@SuppressWarnings("unchecked")
	private void readTitles() {
		Query query = em.createQuery("select t from Title t");
		this.titles = query.getResultList();
	}
	
	@SuppressWarnings("unchecked")
	private void readPublishers() {
		Query query = em.createQuery("select p from Publisher p");
		this.publishers = query.getResultList();
	}
	
	
	public List<Publisher> getPublishers() {
		return publishers;
	}

	public void save() {
		transaction.commit();
		transaction.begin();
	}

	public boolean isDirty() {
		UnitOfWork uow = ((EntityManagerImpl)em).getUnitOfWork();
		return uow.hasChanges();
	}
	public void refresh() {
//		em.flush();
		em.clear();
		readTitles();
	}
	
	public List<Title> getTitles() {
		return titles;
	}
}