/**
 * 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.hadoop.ozone.audit;

import org.apache.commons.io.FileUtils;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Map;

import static org.junit.Assert.assertTrue;

/**
 * Test Ozone Audit Logger.
 */
public class TestOzoneAuditLogger {

  private static final Logger LOG =
      LoggerFactory.getLogger(TestOzoneAuditLogger.class.getName());

  private static final AuditLogger AUDIT =
      new AuditLogger(AuditLoggerType.OMLOGGER);

  private static final String SUCCESS = AuditEventStatus.SUCCESS.name();
  private static final String FAILURE = AuditEventStatus.FAILURE.name();

  private static final Map<String, String> PARAMS =
      new DummyEntity().toAuditMap();

  private static final AuditMessage WRITE_FAIL_MSG =
      new AuditMessage.Builder()
          .setUser("john")
          .atIp("192.168.0.1")
          .forOperation(DummyAction.CREATE_VOLUME.name())
          .withParams(PARAMS)
          .withResult(FAILURE)
          .withException(null).build();

  private static final AuditMessage WRITE_SUCCESS_MSG =
      new AuditMessage.Builder()
          .setUser("john")
          .atIp("192.168.0.1")
          .forOperation(DummyAction.CREATE_VOLUME.name())
          .withParams(PARAMS)
          .withResult(SUCCESS)
          .withException(null).build();

  private static final AuditMessage READ_FAIL_MSG =
      new AuditMessage.Builder()
          .setUser("john")
          .atIp("192.168.0.1")
          .forOperation(DummyAction.READ_VOLUME.name())
          .withParams(PARAMS)
          .withResult(FAILURE)
          .withException(null).build();

  private static final AuditMessage READ_SUCCESS_MSG =
      new AuditMessage.Builder()
          .setUser("john")
          .atIp("192.168.0.1")
          .forOperation(DummyAction.READ_VOLUME.name())
          .withParams(PARAMS)
          .withResult(SUCCESS)
          .withException(null).build();

  @BeforeClass
  public static void setUp(){
    System.setProperty("log4j.configurationFile", "log4j2.properties");
  }

  @AfterClass
  public static void tearDown() {
    File file = new File("audit.log");
    if (FileUtils.deleteQuietly(file)) {
      LOG.info(file.getName() +
          " has been deleted as all tests have completed.");
    } else {
      LOG.info("audit.log could not be deleted.");
    }
  }

  /**
   * Test to verify default log level is INFO when logging success events.
   */
  @Test
  public void verifyDefaultLogLevelForSuccess() throws IOException {
    AUDIT.logWriteSuccess(WRITE_SUCCESS_MSG);
    String expected =
        "INFO  | OMAudit | " + WRITE_SUCCESS_MSG.getFormattedMessage();
    verifyLog(expected);
  }

  /**
   * Test to verify default log level is ERROR when logging failure events.
   */
  @Test
  public void verifyDefaultLogLevelForFailure() throws IOException {
    AUDIT.logWriteFailure(WRITE_FAIL_MSG);
    String expected =
        "ERROR | OMAudit | " + WRITE_FAIL_MSG.getFormattedMessage();
    verifyLog(expected);
  }

  /**
   * Test to verify no READ event is logged.
   */
  @Test
  public void notLogReadEvents() throws IOException {
    AUDIT.logReadSuccess(READ_SUCCESS_MSG);
    AUDIT.logReadFailure(READ_FAIL_MSG);
    verifyNoLog();
  }

  private void verifyLog(String expected) throws IOException {
    File file = new File("audit.log");
    List<String> lines = FileUtils.readLines(file, (String)null);
    final int retry = 5;
    int i = 0;
    while (lines.isEmpty() && i < retry) {
      lines = FileUtils.readLines(file, (String)null);
      try {
        Thread.sleep(500 * (i + 1));
      } catch(InterruptedException ie) {
        Thread.currentThread().interrupt();
        break;
      }
      i++;
    }

    // When log entry is expected, the log file will contain one line and
    // that must be equal to the expected string
    assertTrue(lines.size() != 0);
    assertTrue(expected.equalsIgnoreCase(lines.get(0)));
    //empty the file
    lines.clear();
    FileUtils.writeLines(file, lines, false);
  }

  private void verifyNoLog() throws IOException {
    File file = new File("audit.log");
    List<String> lines = FileUtils.readLines(file, (String)null);
    // When no log entry is expected, the log file must be empty
    assertTrue(lines.size() == 0);
  }
}