/*
 * 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.drill;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.ConsoleAppender;
import org.apache.drill.common.exceptions.UserRemoteException;
import org.apache.drill.exec.exception.OutOfMemoryException;
import org.apache.drill.exec.physical.impl.BaseRootExec;
import org.apache.drill.exec.physical.impl.ScanBatch;
import org.apache.drill.exec.physical.impl.xsort.ExternalSortBatch;
import org.apache.drill.exec.testing.Controls;
import org.apache.drill.exec.testing.ControlsInjectionUtil;
import org.apache.drill.test.ClusterFixture;
import org.apache.drill.test.ClusterFixtureBuilder;
import org.apache.drill.test.ClusterTest;
import org.apache.drill.test.LogFixture;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import static org.junit.Assert.assertTrue;

public class TestOperatorDump extends ClusterTest {

  private static final String ENTRY_DUMP_COMPLETED = "Batch dump completed";
  private static final String ENTRY_DUMP_STARTED = "Batch dump started";

  private LogFixture logFixture;
  private EventAwareContextAppender appender;

  @BeforeClass
  public static void setupFiles() {
    dirTestWatcher.copyResourceToRoot(Paths.get("multilevel"));
  }

  @Before
  public void setup() throws Exception {
    ClusterFixtureBuilder builder = ClusterFixture.builder(dirTestWatcher);
    appender = new EventAwareContextAppender();
    logFixture = LogFixture.builder()
        .toConsole(appender, LogFixture.DEFAULT_CONSOLE_FORMAT)
        .build();
    builder.configBuilder().put(BaseRootExec.ENABLE_BATCH_DUMP_CONFIG, "true");
    startCluster(builder);
  }

  @After
  public void tearDown(){
    logFixture.close();
  }

  @Test(expected = UserRemoteException.class)
  public void testScanBatchChecked() throws Exception {
    String exceptionDesc = "next-allocate";
    final String controls = Controls.newBuilder()
        .addException(ScanBatch.class, exceptionDesc, OutOfMemoryException.class, 0, 1)
        .build();
    ControlsInjectionUtil.setControls(client.client(), controls);
    String query = "select * from dfs.`multilevel/parquet` limit 100";
    try {
      client.queryBuilder().sql(query).run();
    } catch (UserRemoteException e) {
      assertTrue(e.getMessage().contains(exceptionDesc));

      String[] expectedEntries = new String[] {ENTRY_DUMP_STARTED, ENTRY_DUMP_COMPLETED};
      validateContainsEntries(expectedEntries, ScanBatch.class.getName());
      throw e;
    }
  }

  @Test(expected = UserRemoteException.class)
  public void testExternalSortUnchecked() throws Exception {
    Class<?> siteClass = org.apache.drill.exec.physical.impl.xsort.ExternalSortBatch.class;
    final String controls = Controls.newBuilder()
        .addException(siteClass, ExternalSortBatch.INTERRUPTION_AFTER_SORT, RuntimeException.class)
        .build();
    ControlsInjectionUtil.setControls(client.client(), controls);
    String query = "select n_name from cp.`tpch/lineitem.parquet` order by n_name";
    try {
      client.queryBuilder().sql(query).run();
    } catch (UserRemoteException e) {
      assertTrue(e.getMessage().contains(ExternalSortBatch.INTERRUPTION_AFTER_SORT));

      String[] expectedEntries = new String[] {ENTRY_DUMP_STARTED, ENTRY_DUMP_COMPLETED};
      validateContainsEntries(expectedEntries, ExternalSortBatch.class.getName());
      throw e;
    }
  }

  private void validateContainsEntries(String[] entries, String expectedClassName) {
    if (entries == null) {
      entries = new String[0];
    }
    List<String> messages = appender.getMessages();
    List<String> entryList = new ArrayList<>(entries.length);
    Collections.addAll(entryList, entries);
    Iterator<String> it = entryList.iterator();
    while (it.hasNext()) {
      String entry = it.next();
      for (String message : messages) {
        if (message.contains(entry)) {
          it.remove();
          break;
        }
      }
    }
    assertTrue(String.format("Entries %s were not found in logs.", entryList), entryList.isEmpty());

    Set<String> loggerNames = appender.getLoggerNames();
    assertTrue(String.format("Entry for class %s was not found", expectedClassName),
        loggerNames.contains(expectedClassName));
  }

  // ConsoleAppender which stores logged events
  private static class EventAwareContextAppender extends ConsoleAppender<ILoggingEvent> {

    private List<ILoggingEvent> events = new ArrayList<>();

    @Override
    protected void append(ILoggingEvent e) {
      events.add(e);
    }

    List<String> getMessages() {
      return events.stream()
          .map(ILoggingEvent::getMessage)
          .collect(Collectors.toList());
    }

    Set<String> getLoggerNames() {
      return events.stream()
          .map(ILoggingEvent::getLoggerName)
          .collect(Collectors.toSet());
    }
  }
}