/**
 * 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.store.kahadb;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;

import junit.framework.TestCase;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;

/**
 * @author chirino
 */
public class KahaDBTest extends TestCase {

   protected BrokerService createBroker(KahaDBStore kaha) throws Exception {

      BrokerService broker = new BrokerService();
      broker.setUseJmx(false);
      broker.setPersistenceAdapter(kaha);
      broker.start();
      return broker;
   }

   private KahaDBStore createStore(boolean delete) throws IOException {
      KahaDBStore kaha = new KahaDBStore();
      kaha.setDirectory(new File("target/activemq-data/kahadb"));
      if (delete) {
         kaha.deleteAllMessages();
      }
      return kaha;
   }

   public void testIgnoreMissingJournalfilesOptionSetFalse() throws Exception {
      KahaDBStore kaha = createStore(true);
      kaha.setJournalMaxFileLength(1024 * 100);
      assertFalse(kaha.isIgnoreMissingJournalfiles());
      BrokerService broker = createBroker(kaha);
      sendMessages(1000);
      broker.stop();

      // Delete some journal files..
      assertExistsAndDelete(new File(kaha.getDirectory(), "db-4.log"));
      assertExistsAndDelete(new File(kaha.getDirectory(), "db-8.log"));

      kaha = createStore(false);
      kaha.setJournalMaxFileLength(1024 * 100);
      assertFalse(kaha.isIgnoreMissingJournalfiles());
      try {
         broker = createBroker(kaha);
         fail("expected IOException");
      }
      catch (IOException e) {
         assertTrue(e.getMessage().startsWith("Detected missing/corrupt journal files"));
      }

   }

   public void testIgnoreMissingJournalfilesOptionSetTrue() throws Exception {
      KahaDBStore kaha = createStore(true);
      kaha.setJournalMaxFileLength(1024 * 100);
      assertFalse(kaha.isIgnoreMissingJournalfiles());
      BrokerService broker = createBroker(kaha);
      sendMessages(1000);
      broker.stop();

      // Delete some journal files..
      assertExistsAndDelete(new File(kaha.getDirectory(), "db-4.log"));
      assertExistsAndDelete(new File(kaha.getDirectory(), "db-8.log"));

      kaha = createStore(false);
      kaha.setIgnoreMissingJournalfiles(true);
      kaha.setJournalMaxFileLength(1024 * 100);
      broker = createBroker(kaha);

      // We know we won't get all the messages but we should get most of them.
      int count = receiveMessages();
      assertTrue(count > 800);
      assertTrue(count < 1000);

      broker.stop();
   }

   public void testCheckCorruptionNotIgnored() throws Exception {
      KahaDBStore kaha = createStore(true);
      assertTrue(kaha.isChecksumJournalFiles());
      assertFalse(kaha.isCheckForCorruptJournalFiles());

      kaha.setJournalMaxFileLength(1024 * 100);
      kaha.setChecksumJournalFiles(true);
      BrokerService broker = createBroker(kaha);
      sendMessages(1000);
      broker.stop();

      // Modify/Corrupt some journal files..
      assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-4.log"));
      assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-8.log"));

      kaha = createStore(false);
      kaha.setJournalMaxFileLength(1024 * 100);
      kaha.setChecksumJournalFiles(true);
      kaha.setCheckForCorruptJournalFiles(true);
      assertFalse(kaha.isIgnoreMissingJournalfiles());
      try {
         broker = createBroker(kaha);
         fail("expected IOException");
      }
      catch (IOException e) {
         assertTrue(e.getMessage().startsWith("Detected missing/corrupt journal files"));
      }

   }

   public void testMigrationOnNewDefaultForChecksumJournalFiles() throws Exception {
      KahaDBStore kaha = createStore(true);
      kaha.setChecksumJournalFiles(false);
      assertFalse(kaha.isChecksumJournalFiles());
      assertFalse(kaha.isCheckForCorruptJournalFiles());

      kaha.setJournalMaxFileLength(1024 * 100);
      BrokerService broker = createBroker(kaha);
      sendMessages(1000);
      broker.stop();

      kaha = createStore(false);
      kaha.setJournalMaxFileLength(1024 * 100);
      kaha.setCheckForCorruptJournalFiles(true);
      assertFalse(kaha.isIgnoreMissingJournalfiles());
      createBroker(kaha);
      assertEquals(1000, receiveMessages());
   }

   private void assertExistsAndCorrupt(File file) throws IOException {
      assertTrue(file.exists());
      RandomAccessFile f = new RandomAccessFile(file, "rw");
      try {
         f.seek(1024 * 5 + 134);
         f.write("... corruption string ...".getBytes());
      }
      finally {
         f.close();
      }
   }

   public void testCheckCorruptionIgnored() throws Exception {
      KahaDBStore kaha = createStore(true);
      kaha.setJournalMaxFileLength(1024 * 100);
      BrokerService broker = createBroker(kaha);
      sendMessages(1000);
      broker.stop();

      // Delete some journal files..
      assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-4.log"));
      assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-8.log"));

      kaha = createStore(false);
      kaha.setIgnoreMissingJournalfiles(true);
      kaha.setJournalMaxFileLength(1024 * 100);
      kaha.setCheckForCorruptJournalFiles(true);
      broker = createBroker(kaha);

      // We know we won't get all the messages but we should get most of them.
      int count = receiveMessages();
      assertTrue("Expected to received a min # of messages.. Got: " + count, count > 990);
      assertTrue(count < 1000);

      broker.stop();
   }

   private void assertExistsAndDelete(File file) {
      assertTrue(file.exists());
      file.delete();
      assertFalse(file.exists());
   }

   private void sendMessages(int count) throws JMSException {
      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost");
      Connection connection = cf.createConnection();
      try {
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         MessageProducer producer = session.createProducer(new ActiveMQQueue("TEST"));
         for (int i = 0; i < count; i++) {
            producer.send(session.createTextMessage(createContent(i)));
         }
      }
      finally {
         connection.close();
      }
   }

   private int receiveMessages() throws JMSException {
      int rc = 0;
      ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost");
      Connection connection = cf.createConnection();
      try {
         connection.start();
         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
         MessageConsumer messageConsumer = session.createConsumer(new ActiveMQQueue("TEST"));
         while (messageConsumer.receive(1000) != null) {
            rc++;
         }
         return rc;
      }
      finally {
         connection.close();
      }
   }

   private String createContent(int i) {
      StringBuilder sb = new StringBuilder(i + ":");
      while (sb.length() < 1024) {
         sb.append("*");
      }
      return sb.toString();
   }

}