/*
 * 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.storage;

import static java.lang.String.format;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.nio.file.Path;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.neo4j.io.fs.EphemeralFileSystemAbstraction;
import org.neo4j.kernel.api.impl.index.storage.layout.IndexFolderLayout;
import org.neo4j.test.extension.EphemeralFileSystemExtension;
import org.neo4j.test.extension.Inject;

@ExtendWith(EphemeralFileSystemExtension.class)
class FailureStorageTest {
    @Inject
    private EphemeralFileSystemAbstraction fs;

    private IndexFolderLayout indexFolderLayout;

    @BeforeEach
    void before() throws Exception {
        Path rootDirectory = Path.of("dir");
        fs.mkdirs(rootDirectory);
        indexFolderLayout = new IndexFolderLayout(rootDirectory);
    }

    @Test
    void shouldReserveFailureFile() throws Exception {
        // GIVEN
        FailureStorage storage = new FailureStorage(fs, indexFolderLayout);

        // WHEN
        storage.reserveForIndex();

        // THEN
        Path failureFile = storage.failureFile();
        assertTrue(fs.fileExists(failureFile));
        assertTrue(fs.getFileSize(failureFile) > 100);
    }

    @Test
    void shouldStoreFailure() throws Exception {
        // GIVEN
        FailureStorage storage = new FailureStorage(fs, indexFolderLayout);
        storage.reserveForIndex();
        String failure = format("A failure message%nspanning%nmultiple lines.");

        // WHEN
        storage.storeIndexFailure(failure);

        // THEN
        Path failureFile = storage.failureFile();
        assertTrue(fs.fileExists(failureFile));
        assertTrue(fs.getFileSize(failureFile) > 100);
        assertEquals(failure, storage.loadIndexFailure());
    }

    @Test
    void shouldClearFailure() throws Exception {
        // GIVEN
        FailureStorage storage = new FailureStorage(fs, indexFolderLayout);
        storage.reserveForIndex();
        String failure = format("A failure message%nspanning%nmultiple lines.");
        storage.storeIndexFailure(failure);
        Path failureFile = storage.failureFile();
        assertTrue(fs.fileExists(failureFile));
        assertTrue(fs.getFileSize(failureFile) > 100);

        // WHEN
        storage.clearForIndex();

        // THEN
        assertFalse(fs.fileExists(failureFile));
    }

    @Test
    void shouldAppendFailureIfAlreadyExists() throws Exception {
        // GIVEN
        FailureStorage storage = new FailureStorage(fs, indexFolderLayout);
        storage.reserveForIndex();
        String failure1 = "Once upon a time there was a first failure";
        String failure2 = "Then there was another";
        storage.storeIndexFailure(failure1);

        // WHEN
        storage.storeIndexFailure(failure2);

        // THEN
        String allFailures = storage.loadIndexFailure();
        assertThat(allFailures).contains(failure1);
        assertThat(allFailures).contains(failure2);
    }
}
