/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.portlet.dao.jpa;

import com.google.common.base.Function;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import org.apache.commons.lang.Validate;
import org.apereo.portal.jpa.BasePortalJpaDao;
import org.apereo.portal.jpa.OpenEntityManager;
import org.apereo.portal.portlet.dao.IPortletTypeDao;
import org.apereo.portal.portlet.om.IPortletType;
import org.springframework.stereotype.Repository;

/**
 * JPA/Hibernate implementation of IChannelTypeDao. This DAO handles channel types and is not yet
 * integrated with the channel definition persistence code.
 *
 */
@Repository
public class JpaPortletTypeDao extends BasePortalJpaDao implements IPortletTypeDao {
    private CriteriaQuery<PortletTypeImpl> findAllTypesQuery;

    @Override
    public void afterPropertiesSet() throws Exception {
        this.findAllTypesQuery =
                this.createCriteriaQuery(
                        new Function<CriteriaBuilder, CriteriaQuery<PortletTypeImpl>>() {
                            @Override
                            public CriteriaQuery<PortletTypeImpl> apply(CriteriaBuilder cb) {
                                final CriteriaQuery<PortletTypeImpl> criteriaQuery =
                                        cb.createQuery(PortletTypeImpl.class);
                                criteriaQuery.from(PortletTypeImpl.class);
                                return criteriaQuery;
                            }
                        });
    }

    @Override
    @PortalTransactional
    public void deletePortletType(IPortletType type) {
        Validate.notNull(type, "definition can not be null");

        final IPortletType persistentChanneltype;
        final EntityManager entityManager = this.getEntityManager();
        if (entityManager.contains(type)) {
            persistentChanneltype = type;
        } else {
            persistentChanneltype = entityManager.merge(type);
        }
        entityManager.remove(persistentChanneltype);
    }

    @Override
    @PortalTransactional
    public IPortletType createPortletType(String name, String cpdUri) {
        Validate.notEmpty(name, "name can not be null");
        Validate.notEmpty(cpdUri, "cpdUri can not be null");

        final PortletTypeImpl channelType = new PortletTypeImpl(name, cpdUri);

        this.getEntityManager().persist(channelType);

        return channelType;
    }

    @Override
    public IPortletType getPortletType(int id) {
        return this.getEntityManager().find(PortletTypeImpl.class, id);
    }

    @OpenEntityManager(unitName = PERSISTENCE_UNIT_NAME)
    @Override
    public IPortletType getPortletType(String name) {
        final NaturalIdQuery<PortletTypeImpl> query =
                this.createNaturalIdQuery(PortletTypeImpl.class);
        query.using(PortletTypeImpl_.name, name);
        return query.load();
    }

    @Override
    public List<IPortletType> getPortletTypes() {
        final TypedQuery<PortletTypeImpl> query = this.createCachedQuery(this.findAllTypesQuery);
        final List<PortletTypeImpl> portletTypes = query.getResultList();
        return new ArrayList<IPortletType>(portletTypes);
    }

    @Override
    @PortalTransactional
    public IPortletType updatePortletType(IPortletType type) {
        Validate.notNull(type, "type can not be null");

        this.getEntityManager().persist(type);

        return type;
    }
}