/*
 * 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.dbms.database;

import static org.neo4j.dbms.database.SystemGraphComponent.VERSION_LABEL;

import java.util.List;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.event.TransactionData;
import org.neo4j.graphdb.event.TransactionEventListener;
import org.neo4j.internal.helpers.collection.Iterables;

/**
 * A version of {@link} DbmsRuntimeRepository for standalone editions.
 */
public class StandaloneDbmsRuntimeRepository extends DbmsRuntimeRepository implements TransactionEventListener<Object> {

    public StandaloneDbmsRuntimeRepository(
            DatabaseContextProvider<?> databaseContextProvider, DbmsRuntimeSystemGraphComponent component) {
        super(databaseContextProvider, component);
    }

    @Override
    public Object beforeCommit(TransactionData data, Transaction transaction, GraphDatabaseService databaseService)
            throws Exception {
        // not interested in this event
        return null;
    }

    @Override
    public void afterCommit(TransactionData transactionData, Object state, GraphDatabaseService databaseService) {
        // no check is needed if we are at the latest version, because downgrade is not supported
        if (transactionData == null || getVersion().isCurrent(component.config)) {
            return;
        }

        List<Long> nodesWithChangedProperties = Iterables.stream(transactionData.assignedNodeProperties())
                .map(nodePropertyEntry -> nodePropertyEntry.entity().getId())
                .toList();

        var systemDatabase = getSystemDb();
        try (var tx = systemDatabase.beginTx()) {
            nodesWithChangedProperties.stream()
                    .map(tx::getNodeById)
                    .filter(node -> node.hasLabel(VERSION_LABEL)
                            && node.hasProperty(component.componentName().name()))
                    .map(dbmRuntime -> (int)
                            dbmRuntime.getProperty(component.componentName().name()))
                    .map(DbmsRuntimeVersion::fromVersionNumber)
                    .forEach(this::setVersion);
        }
    }

    @Override
    public void afterRollback(TransactionData data, Object state, GraphDatabaseService databaseService) {
        // not interested in this event
    }
}
