/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.internal.recordstorage;

import java.io.IOException;
import org.neo4j.internal.helpers.Numbers;
import org.neo4j.internal.recordstorage.Command.MetaDataCommand;
import org.neo4j.kernel.KernelVersion;
import org.neo4j.kernel.KernelVersionRepository;
import org.neo4j.storageengine.api.CommandBatchToApply;

public class KernelVersionTransactionApplier extends TransactionApplier.Adapter {
    private final KernelVersionRepository kernelVersionRepository;

    public KernelVersionTransactionApplier(KernelVersionRepository kernelVersionRepository) {
        this.kernelVersionRepository = kernelVersionRepository;
    }

    @Override
    public boolean visitMetaDataCommand(MetaDataCommand command) {
        final var kernelVersion = KernelVersion.getForVersion(
                Numbers.safeCastLongToByte(command.getAfter().getValue()));
        kernelVersionRepository.setKernelVersion(kernelVersion);
        return false;
    }

    public static class Factory implements TransactionApplierFactory {
        private final KernelVersionRepository kernelVersionRepository;

        public Factory(KernelVersionRepository kernelVersionRepository) {
            this.kernelVersionRepository = kernelVersionRepository;
        }

        @Override
        public TransactionApplier startTx(CommandBatchToApply transaction, BatchContext batchContext)
                throws IOException {
            return new KernelVersionTransactionApplier(kernelVersionRepository);
        }
    }
}
