/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.master.journal.ufs;

import alluxio.BaseIntegrationTest;
import alluxio.util.URIUtils;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.net.URI;

/**
 * Unit tests for {@link UfsJournal}.
 */
public final class UfsJournalTest extends BaseIntegrationTest {
  @Rule
  public TemporaryFolder mFolder = new TemporaryFolder();

  private UfsJournal mJournal;

  @Before
  public void before() throws Exception {
    mJournal = new UfsJournal(URIUtils
        .appendPathOrDie(new URI(mFolder.newFolder().getAbsolutePath()), "FileSystemMaster"));
  }

  /**
   * Tests formatting journal.
   */
  @Test
  public void format() throws Exception {
    mJournal.getUfs().create(UfsJournalFile.encodeCheckpointFileLocation(mJournal, 0x12).toString())
        .close();
    mJournal.getUfs()
        .create(UfsJournalFile.encodeTemporaryCheckpointFileLocation(mJournal).toString()).close();

    long start = 0x11;
    for (int i = 0; i < 10; i++) {
      String l =
          UfsJournalFile.encodeLogFileLocation(mJournal, start + i, start + i + 2).toString();
      mJournal.getUfs().create(l).close();
      start = start + i + 2;
    }
    String currentLog =
        UfsJournalFile.encodeLogFileLocation(mJournal, start, UfsJournal.UNKNOWN_SEQUENCE_NUMBER)
            .toString();
    mJournal.getUfs().create(currentLog).close();
    // Write a malformed log file which should be skipped.
    mJournal.getUfs()
        .create(UfsJournalFile.encodeLogFileLocation(mJournal, 0x10, 0x100).toString() + ".tmp")
        .close();

    mJournal.format();
    Assert.assertTrue(mJournal.isFormatted());
    UfsJournalSnapshot snapshot = UfsJournalSnapshot.getSnapshot(mJournal);
    Assert.assertTrue(snapshot.getCheckpoints().isEmpty());
    Assert.assertTrue(snapshot.getLogs().isEmpty());
    Assert.assertTrue(snapshot.getTemporaryCheckpoints().isEmpty());
  }
}