/*
 * $RCSFile$
 *
 * Created on 11.06.2007
 * for Project: 
 * by steins
 *
 * (C) 2005-2006 by 
 */
package beans;

import java.io.IOException;
import java.util.Map;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.servlet.http.HttpSession;

import jpa.Category;
import jpa.EntityManagerFactorySingleton;
import jpa.Product;

@ManagedBean(name = "ProductManager")
@SessionScoped
public class ProductManager {
	private Product current;

	public Product getCurrent() {
		return current;
	}

	public void select(javax.faces.event.ActionEvent actionEvent) {
		FacesContext context = FacesContext.getCurrentInstance();
		Map params = context.getExternalContext().getRequestParameterMap();
		int selectedId = Integer.valueOf((String) params.get("selectedId"), 10);
		// System.out.println(selectedId);

		EntityManager manager = EntityManagerFactorySingleton.getInstance().getEntityManagerFactory()
				.createEntityManager();

		EntityTransaction tx = manager.getTransaction();
		tx.begin();
		try {
			current = manager.find(Product.class, selectedId);

			tx.commit();
		} catch (Exception ex) {
			ex.printStackTrace(System.err);
			tx.rollback();
		}

		try {
			context.getExternalContext().redirect("product.jsf");
		} catch (IOException e) {
			e.printStackTrace();
		}
		context.responseComplete();
		manager.close();
	}

	public void saveCurrentProduct() {
		FacesContext context = FacesContext.getCurrentInstance();

		EntityManager manager = EntityManagerFactorySingleton.getInstance().getEntityManagerFactory()
				.createEntityManager();

		EntityTransaction tx = manager.getTransaction();
		HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
		CategoryManager cm = (CategoryManager) session.getAttribute("CategoryManager");
		try {
			tx.begin();

			current = manager.merge(current);
			cm.setCurrent(manager.find(Category.class, cm.getCurrent().getId()));

			Category cat = manager.find(Category.class, cm.getCurrent().getId());
			cat.getProducts().add(current);

			manager.merge(cat);
			cm.setCurrent(manager.find(Category.class, cm.getCurrent().getId()));

			tx.commit();
		} catch (Exception ex) {
			ex.printStackTrace(System.err);
			if (tx.isActive()) {
				tx.rollback();
			}
		}

		try {
			context.getExternalContext().redirect("products.jsf");
		} catch (IOException e) {
			e.printStackTrace();
		}
		context.responseComplete();
		manager.close();
	}

	public void newProduct() {
		current = new Product();

		FacesContext context = FacesContext.getCurrentInstance();

		try {
			context.getExternalContext().redirect("product.jsf");
		} catch (IOException e) {
			e.printStackTrace();
		}
		context.responseComplete();
	}

	public void deleteProduct(javax.faces.event.ActionEvent actionEvent) {

		FacesContext context = FacesContext.getCurrentInstance();
		Map params = context.getExternalContext().getRequestParameterMap();
		int selectedId = Integer.valueOf((String) params.get("selectedId"), 10);
		// System.out.println(selectedId);

		EntityManager manager = EntityManagerFactorySingleton.getInstance().getEntityManagerFactory()
				.createEntityManager();
		HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
		CategoryManager cm = (CategoryManager) session.getAttribute("CategoryManager");

		EntityTransaction tx = manager.getTransaction();
		tx.begin();
		try {
			current = manager.find(Product.class, selectedId);
			Category ca = manager.find(Category.class, cm.getCurrent().getId());

			ca.getProducts().remove(current);
			manager.merge(ca);

			if (current.getCategories().isEmpty()) {
				manager.remove(current);
				current = null;
			}

			cm.setCurrent(manager.find(Category.class, cm.getCurrent().getId()));
			tx.commit();
		} catch (Exception ex) {
			ex.printStackTrace(System.err);
			tx.rollback();
		}

		try {
			context.getExternalContext().redirect("products.jsf");
		} catch (IOException e) {
			e.printStackTrace();
		}
		context.responseComplete();
		manager.close();
	}
}