/**
 * 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.activemq.broker.jmx;

import java.util.List;

import javax.jms.ConnectionFactory;
import javax.management.MBeanServer;
import javax.management.MBeanServerInvocationHandler;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.EmbeddedBrokerTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.slf4j.LoggerFactory;

public class Log4JConfigTest extends EmbeddedBrokerTestSupport {

   private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(Log4JConfigTest.class);

   private static final String BROKER_LOGGER = "org.apache.activemq.broker.BrokerService";

   protected MBeanServer mbeanServer;
   protected String domain = "org.apache.activemq";

   @Override
   protected void setUp() throws Exception {
      bindAddress = "tcp://localhost:0";
      useTopic = false;
      super.setUp();
      mbeanServer = broker.getManagementContext().getMBeanServer();
   }

   @Override
   protected void tearDown() throws Exception {
      super.tearDown();
   }

   @Override
   protected ConnectionFactory createConnectionFactory() throws Exception {
      return new ActiveMQConnectionFactory(broker.getTransportConnectors().get(0).getPublishableConnectString());
   }

   @Override
   protected BrokerService createBroker() throws Exception {
      BrokerService answer = new BrokerService();
      answer.setPersistent(true);
      answer.setDeleteAllMessagesOnStartup(true);
      answer.setUseJmx(true);
      answer.setSchedulerSupport(true);
      answer.addConnector(bindAddress);
      return answer;
   }

   @Test
   public void testLog4JConfigViewExists() throws Exception {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      String log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName).toString();
      assertRegisteredObjectName(log4jConfigViewName);
   }

   @Test
   public void testLog4JConfigViewGetLoggers() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      List<String> loggers = log4jConfigView.getLoggers();
      assertNotNull(loggers);
      assertFalse(loggers.isEmpty());
   }

   @Test
   public void testLog4JConfigViewGetLevel() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      String level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertFalse(level.isEmpty());
   }

   @Test
   public void testLog4JConfigViewGetLevelUnknownLoggerName() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      // Non-existent loggers will return a name equal to the root level.
      String level = log4jConfigView.getLogLevel("not.a.logger");
      assertNotNull(level);
      assertFalse(level.isEmpty());
      assertEquals(Logger.getRootLogger().getLevel().toString(), level);
   }

   @Test
   public void testLog4JConfigViewSetLevel() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      String level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertFalse(level.isEmpty());

      log4jConfigView.setLogLevel(BROKER_LOGGER, "WARN");
      level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertEquals("WARN", level);

      log4jConfigView.setLogLevel(BROKER_LOGGER, "INFO");
      level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertEquals("INFO", level);
   }

   @Test
   public void testLog4JConfigViewSetLevelNoChangeIfLevelIsBad() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      log4jConfigView.setLogLevel(BROKER_LOGGER, "INFO");
      String level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertEquals("INFO", level);

      log4jConfigView.setLogLevel(BROKER_LOGGER, "BAD");
      level = log4jConfigView.getLogLevel(BROKER_LOGGER);
      assertNotNull(level);
      assertEquals("INFO", level);
   }

   @Test
   public void testLog4JConfigViewGetRootLogLevel() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      String level = log4jConfigView.getRootLogLevel();
      assertNotNull(level);
      assertFalse(level.isEmpty());

      String currentRootLevel = Logger.getRootLogger().getLevel().toString();
      assertEquals(currentRootLevel, level);
   }

   @Test
   public void testLog4JConfigViewSetRootLevel() throws Throwable {
      String brokerObjectName = broker.getBrokerObjectName().toString();
      ObjectName log4jConfigViewName = BrokerMBeanSupport.createLog4JConfigViewName(brokerObjectName);
      Log4JConfigViewMBean log4jConfigView = MBeanServerInvocationHandler.newProxyInstance(mbeanServer, log4jConfigViewName, Log4JConfigViewMBean.class, true);

      String currentRootLevel = Logger.getRootLogger().getLevel().toString();
      log4jConfigView.setRootLogLevel("WARN");
      currentRootLevel = Logger.getRootLogger().getLevel().toString();
      assertEquals("WARN", currentRootLevel);
      log4jConfigView.setRootLogLevel("INFO");
      currentRootLevel = Logger.getRootLogger().getLevel().toString();
      assertEquals("INFO", currentRootLevel);

      Level level;
   }

   protected ObjectName assertRegisteredObjectName(String name) throws MalformedObjectNameException, NullPointerException {
      ObjectName objectName = new ObjectName(name);
      if (mbeanServer.isRegistered(objectName)) {
         LOG.info("Bean Registered: " + objectName);
      }
      else {
         fail("Could not find MBean!: " + objectName);
      }
      return objectName;
   }
}
