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/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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 io.micronaut.configuration.hibernate.jpa.proxy;

import io.micronaut.core.annotation.Internal;
import org.hibernate.LazyInitializationException;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.proxy.AbstractLazyInitializer;

/**
 * Basic {@link org.hibernate.proxy.LazyInitializer}.
 *
 * @author Denis Stepanov
 * @since 3.3.0
 */
@Internal
final class IntroducedHibernateProxyLazyInitializer extends AbstractLazyInitializer {

    protected final Class persistentClass;

    protected IntroducedHibernateProxyLazyInitializer(String entityName,
                                                      Class persistentClass,
                                                      Object id,
                                                      SharedSessionContractImplementor session) {
        super(entityName, id, session);
        this.persistentClass = persistentClass;
    }

    @Override
    public Class getPersistentClass() {
        return persistentClass;
    }

    @Override
    public Class getImplementationClass() {
        if (!isUninitialized()) {
            return getImplementation().getClass();
        }
        final SharedSessionContractImplementor session = getSession();
        if (session == null) {
            throw new LazyInitializationException("could not retrieve real entity class [" + getEntityName() + "#" + getIdentifier() + "] - no Session");
        }
        final SessionFactoryImplementor factory = session.getFactory();
        final EntityPersister entityDescriptor = factory.getMappingMetamodel().getEntityDescriptor(getEntityName());
        if (entityDescriptor.getEntityMappingType().hasSubclasses()) {
            return getImplementation().getClass();
        }
        return persistentClass;
    }
}