/*
 * 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.kernel.api.impl.index.partition;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

import java.io.IOException;
import java.nio.file.Path;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.Directory;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.neo4j.configuration.Config;
import org.neo4j.kernel.api.impl.index.IndexWriterConfigs;
import org.neo4j.kernel.api.impl.index.SearcherReference;
import org.neo4j.kernel.api.impl.index.storage.DirectoryFactory;
import org.neo4j.test.extension.Inject;
import org.neo4j.test.extension.testdirectory.TestDirectoryExtension;
import org.neo4j.test.utils.TestDirectory;

@TestDirectoryExtension
class IndexPartitionFactoryTest {
    @Inject
    private TestDirectory testDirectory;

    private Directory directory;

    @BeforeEach
    void setUp() throws IOException {
        directory = DirectoryFactory.PERSISTENT.open(testDirectory.homePath());
    }

    @Test
    void createReadOnlyPartition() throws Exception {
        prepareIndex();
        try (AbstractIndexPartition indexPartition =
                new ReadOnlyIndexPartitionFactory().createPartition(testDirectory.homePath(), directory)) {
            assertThrows(UnsupportedOperationException.class, indexPartition::getIndexWriter);
        }
    }

    @Test
    void createWritablePartition() throws Exception {
        try (AbstractIndexPartition indexPartition = new WritableIndexPartitionFactory(
                        () -> IndexWriterConfigs.standard(Config.defaults()))
                .createPartition(testDirectory.homePath(), directory)) {

            try (IndexWriter indexWriter = indexPartition.getIndexWriter()) {
                indexWriter.addDocument(new Document());
                indexWriter.commit();
                indexPartition.maybeRefreshBlocking();
                try (SearcherReference searcher = indexPartition.acquireSearcher()) {
                    assertEquals(
                            1,
                            searcher.getIndexSearcher().getIndexReader().numDocs(),
                            "We should be able to see newly added document ");
                }
            }
        }
    }

    private void prepareIndex() throws IOException {
        Path location = testDirectory.homePath();
        try (AbstractIndexPartition ignored = new WritableIndexPartitionFactory(
                        () -> IndexWriterConfigs.standard(Config.defaults()))
                .createPartition(location, DirectoryFactory.PERSISTENT.open(location))) {
            // empty
        }
    }
}
