/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.consensus.iot.logdispatcher;

import org.apache.iotdb.common.rpc.thrift.TEndPoint;
import org.apache.iotdb.commons.consensus.DataRegionId;
import org.apache.iotdb.consensus.common.Peer;
import org.apache.iotdb.consensus.ratis.utils.Utils;

import org.apache.ratis.util.FileUtils;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

public class IndexControllerTest {

  private static final File storageDir = new File("target" + java.io.File.separator + "test");

  private static final Peer peer =
      new Peer(new DataRegionId(1), 2, new TEndPoint("datanode-1.datanode-svc", 6667));

  private static final long CHECK_POINT_GAP = 500;

  @Before
  public void setUp() throws IOException {
    FileUtils.createDirectories(storageDir);
  }

  @After
  public void tearDown() throws IOException {
    FileUtils.deleteFully(storageDir);
  }

  @Test
  public void testRestart() {
    IndexController controller =
        new IndexController(storageDir.getAbsolutePath(), peer, 0, CHECK_POINT_GAP);
    Assert.assertEquals(0, controller.getCurrentIndex());
    Assert.assertEquals(0, controller.getLastFlushedIndex());

    controller.update(CHECK_POINT_GAP - 1, false);
    Assert.assertEquals(CHECK_POINT_GAP - 1, controller.getCurrentIndex());
    Assert.assertEquals(0, controller.getLastFlushedIndex());

    controller = new IndexController(storageDir.getAbsolutePath(), peer, 0, CHECK_POINT_GAP);
    Assert.assertEquals(0, controller.getCurrentIndex());
    Assert.assertEquals(0, controller.getLastFlushedIndex());

    controller.update(CHECK_POINT_GAP - 1, true);
    Assert.assertEquals(CHECK_POINT_GAP - 1, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP - 1, controller.getLastFlushedIndex());

    controller = new IndexController(storageDir.getAbsolutePath(), peer, 0, CHECK_POINT_GAP);
    Assert.assertEquals(CHECK_POINT_GAP - 1, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP - 1, controller.getLastFlushedIndex());

    controller.update(CHECK_POINT_GAP * 2, false);
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getLastFlushedIndex());

    controller = new IndexController(storageDir.getAbsolutePath(), peer, 0, CHECK_POINT_GAP);
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getLastFlushedIndex());

    controller.update(CHECK_POINT_GAP * 2 - 1, true);
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP * 2, controller.getLastFlushedIndex());

    controller.update(CHECK_POINT_GAP * 2 + 1, true);
    Assert.assertEquals(CHECK_POINT_GAP * 2 + 1, controller.getCurrentIndex());
    Assert.assertEquals(CHECK_POINT_GAP * 2 + 1, controller.getLastFlushedIndex());
  }

  @Test
  public void testUpgrade() throws IOException {
    File oldFile =
        new File(
            storageDir,
            Utils.fromTEndPointToString(peer.getEndpoint()) + IndexController.SEPARATOR + 100);
    Files.createFile(oldFile.toPath());

    IndexController controller =
        new IndexController(storageDir.getAbsolutePath(), peer, 0, CHECK_POINT_GAP);
    Assert.assertEquals(100, controller.getCurrentIndex());

    File newFile = new File(storageDir, peer.getNodeId() + IndexController.SEPARATOR + 100);
    Assert.assertTrue(newFile.exists());
  }
}
