/*
 * 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.graphdb.factory;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.neo4j.configuration.GraphDatabaseInternalSettings.databases_root_path;
import static org.neo4j.configuration.GraphDatabaseSettings.DEFAULT_DATABASE_NAME;
import static org.neo4j.configuration.GraphDatabaseSettings.SYSTEM_DATABASE_NAME;
import static org.neo4j.io.ByteUnit.kibiBytes;
import static org.neo4j.io.fs.FileSystemUtils.isEmptyOrNonExistingDirectory;
import static org.neo4j.kernel.database.NamedDatabaseId.NAMED_SYSTEM_DATABASE_ID;

import java.io.IOException;
import java.nio.file.Path;
import org.junit.jupiter.api.Test;
import org.neo4j.common.DependencyResolver;
import org.neo4j.configuration.GraphDatabaseSettings;
import org.neo4j.dbms.api.DatabaseManagementService;
import org.neo4j.dbms.api.DatabaseManagementServiceBuilder;
import org.neo4j.dbms.database.DatabaseContextProvider;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.layout.Neo4jLayout;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.test.extension.Inject;
import org.neo4j.test.extension.Neo4jLayoutExtension;
import org.neo4j.test.utils.TestDirectory;

@Neo4jLayoutExtension
class DatabaseManagementServiceBuilderIT {
    @Inject
    private FileSystemAbstraction fs;

    @Inject
    private TestDirectory testDirectory;

    @Inject
    private Neo4jLayout neo4jLayout;

    @Test
    void startSystemAndDefaultDatabase() {
        DatabaseManagementService managementService =
                getDbmsBuilderWithLimitedTxLogSize(testDirectory.homePath()).build();
        GraphDatabaseAPI database = (GraphDatabaseAPI) managementService.database(DEFAULT_DATABASE_NAME);
        try {
            DependencyResolver dependencyResolver = database.getDependencyResolver();
            DatabaseContextProvider<?> databaseContextProvider =
                    dependencyResolver.resolveDependency(DatabaseContextProvider.class);
            assertThat(databaseContextProvider.getDatabaseContext(DEFAULT_DATABASE_NAME))
                    .isNotEmpty();
            assertThat(databaseContextProvider.getDatabaseContext(NAMED_SYSTEM_DATABASE_ID))
                    .isNotEmpty();
        } finally {
            managementService.shutdown();
        }
    }

    @Test
    void configuredDatabasesRootPath() throws IOException {
        Path homeDir = testDirectory.homePath();
        Path storeDir = testDirectory.homePath();
        Path databasesDir = testDirectory.directory("my_databases");

        DatabaseManagementService managementService = getDbmsBuilderWithLimitedTxLogSize(homeDir)
                .setConfig(databases_root_path, databasesDir)
                .build();
        try {
            assertTrue(isEmptyOrNonExistingDirectory(fs, storeDir.resolve(DEFAULT_DATABASE_NAME)));
            assertTrue(isEmptyOrNonExistingDirectory(fs, storeDir.resolve(SYSTEM_DATABASE_NAME)));

            assertFalse(isEmptyOrNonExistingDirectory(fs, databasesDir.resolve(DEFAULT_DATABASE_NAME)));
            assertFalse(isEmptyOrNonExistingDirectory(fs, databasesDir.resolve(SYSTEM_DATABASE_NAME)));
        } finally {
            managementService.shutdown();
        }
    }

    @Test
    void notConfiguredDatabasesRootPath() throws IOException {
        Neo4jLayout layout = neo4jLayout;

        DatabaseManagementService managementService =
                getDbmsBuilderWithLimitedTxLogSize(layout.homeDirectory()).build();
        try {
            assertFalse(isEmptyOrNonExistingDirectory(
                    fs, layout.databaseLayout(DEFAULT_DATABASE_NAME).databaseDirectory()));
            assertFalse(isEmptyOrNonExistingDirectory(
                    fs, layout.databaseLayout(SYSTEM_DATABASE_NAME).databaseDirectory()));
        } finally {
            managementService.shutdown();
        }
    }

    private static DatabaseManagementServiceBuilder getDbmsBuilderWithLimitedTxLogSize(Path homeDirectory) {
        return new DatabaseManagementServiceBuilder(homeDirectory)
                .setConfig(GraphDatabaseSettings.logical_log_rotation_threshold, kibiBytes(128));
    }
}
