/*
 * Copyright (C) 2013 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jboss.errai.demo.grocery.client.local.producer;

import java.util.List;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;

import org.jboss.errai.demo.grocery.client.shared.GroceryList;
import org.jboss.errai.demo.grocery.client.shared.User;
import org.jboss.errai.jpa.client.local.ErraiEntityManager;

@ApplicationScoped
public class GroceryListProducer {

    //@Produces
    @ApplicationScoped
    private GroceryList getGroceryList(final EntityManager em, final User user) {
        final TypedQuery<GroceryList> q = em.createNamedQuery("groceryListsForUser", GroceryList.class);
        q.setParameter("user", user);
        final List<GroceryList> groceryLists = q.getResultList();

        final GroceryList gl;
        if (groceryLists.isEmpty()) {
            gl = new GroceryList();
            gl.setOwner(user);
            em.persist(gl);
            em.flush();
        }
        else {
            gl = groceryLists.get(0);
        }

        return gl;
    }

}