/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.keycloak.connections.jpa.util;

import org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl;
import org.hibernate.jpa.boot.internal.ParsedPersistenceXmlDescriptor;
import org.hibernate.jpa.boot.internal.PersistenceXmlParser;
import org.hibernate.jpa.boot.spi.Bootstrap;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceUnitTransactionType;
import java.util.List;
import java.util.Map;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class JpaUtils {

    public static final String HIBERNATE_DEFAULT_SCHEMA = "hibernate.default_schema";

    public static String getTableNameForNativeQuery(String tableName, EntityManager em) {
        String schema = (String) em.getEntityManagerFactory().getProperties().get(HIBERNATE_DEFAULT_SCHEMA);
        return (schema==null) ? tableName : schema + "." + tableName;
    }

    public static EntityManagerFactory createEntityManagerFactory(String unitName, Map<String, Object> properties, ClassLoader classLoader) {
        PersistenceXmlParser parser = new PersistenceXmlParser(new ClassLoaderServiceImpl(classLoader), PersistenceUnitTransactionType.RESOURCE_LOCAL);
        List<ParsedPersistenceXmlDescriptor> persistenceUnits = parser.doResolve(properties);
        for (ParsedPersistenceXmlDescriptor persistenceUnit : persistenceUnits) {
            if (persistenceUnit.getName().equals(unitName)) {
                return Bootstrap.getEntityManagerFactoryBuilder(persistenceUnit, properties, classLoader).build();
            }
        }
        throw new RuntimeException("Persistence unit '" + unitName + "' not found");
    }
}
