/*
 * 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.geode.internal.cache.tier.sockets;

import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_ID;
import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_TIMEOUT;
import static org.apache.geode.distributed.ConfigurationProperties.LOCATORS;
import static org.apache.geode.distributed.ConfigurationProperties.MCAST_PORT;
import static org.apache.geode.test.dunit.Assert.assertEquals;
import static org.apache.geode.test.dunit.Assert.assertNotNull;
import static org.apache.geode.test.dunit.Assert.fail;

import java.util.ArrayList;
import java.util.Properties;
import java.util.concurrent.RejectedExecutionException;

import org.junit.Test;
import org.junit.experimental.categories.Category;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.CacheException;
import org.apache.geode.cache.InterestResultPolicy;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.client.Pool;
import org.apache.geode.cache.client.PoolFactory;
import org.apache.geode.cache.client.PoolManager;
import org.apache.geode.cache30.CacheSerializableRunnable;
import org.apache.geode.internal.cache.CacheServerImpl;
import org.apache.geode.internal.cache.PoolFactoryImpl;
import org.apache.geode.test.dunit.Assert;
import org.apache.geode.test.dunit.Host;
import org.apache.geode.test.dunit.NetworkUtils;
import org.apache.geode.test.dunit.VM;
import org.apache.geode.test.dunit.Wait;
import org.apache.geode.test.dunit.internal.JUnit4DistributedTestCase;
import org.apache.geode.test.junit.categories.ClientSubscriptionTest;

/**
 * The DUnitTest checks whether the following Three counts are incremented correctly or not: 1)
 * DurableReconnectionCount -> Incremented Each time a Proxy present in server for a DurableClient
 * 2) QueueDroppedCount -> Incremented Each time a queue for a durable client is dropped after
 * durable Timeout 3) EventsEnqueuedWhileClientAwayCount -> Incremented Each time an entry is made
 * when client is away.
 *
 * In the given test DurableClient comes up and goes down discreetly with different
 * DurableClientTimeouts so as to increment the counts
 */
@Category({ClientSubscriptionTest.class})
public class DurableClientStatsDUnitTest extends JUnit4DistributedTestCase {

  private VM server1VM;

  private VM durableClientVM;

  private String regionName;

  private int PORT1;

  private final String K1 = "Key1";

  @Override
  public final void postSetUp() throws Exception {
    Host host = Host.getHost(0);
    this.server1VM = host.getVM(0);
    this.durableClientVM = host.getVM(1);
    regionName = DurableClientStatsDUnitTest.class.getName() + "_region";
    CacheServerTestUtil.disableShufflingOfEndpoints();
  }

  @Override
  public final void preTearDown() throws Exception {
    // Stop server 1
    this.server1VM.invoke(() -> CacheServerTestUtil.closeCache());
    CacheServerTestUtil.resetDisableShufflingOfEndpointsFlag();
  }

  @Test
  public void testNonDurableClientStatistics() {
    // Step 1: Starting the servers
    PORT1 = ((Integer) this.server1VM
        .invoke(() -> CacheServerTestUtil.createCacheServer(regionName, new Boolean(true))))
            .intValue();
    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.checkStatistics());
    // Step 2: Bring Up the Client
    // Start a durable client that is not kept alive on the server when it
    // stops normally
    final int durableClientTimeout = 600; // keep the client alive for 600
    // seconds

    startAndCloseNonDurableClientCache(durableClientTimeout);
    startAndCloseNonDurableClientCache(1); //////// -> Reconnection1
    Wait.pause(1400); //////// -> Queue Dropped1
    startAndCloseNonDurableClientCache(1);
    Wait.pause(1400); //////// -> Queue Dropped2

    startRegisterAndCloseNonDurableClientCache(durableClientTimeout);
    Wait.pause(500);

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.putValue(K1, "Value1")); //////// ->
                                                                                     //////// Enqueue
                                                                                     //////// Message1

    Wait.pause(500);
    startAndCloseNonDurableClientCache(1); //////// -> Reconnection2
    Wait.pause(1400); //////// -> Queue Dropped3
    startAndCloseNonDurableClientCache(1);
    Wait.pause(1400); //////// -> Queue Dropped4
    startRegisterAndCloseNonDurableClientCache(durableClientTimeout);
    Wait.pause(500);

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.putValue(K1, "NewValue1")); //////// ->
                                                                                        //////// Enqueue
                                                                                        //////// Message2

    startAndCloseNonDurableClientCache(durableClientTimeout); //////// -> Reconnection3

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest
        .checkStatisticsWithExpectedValues(new Integer(0), new Integer(0), new Integer(0)));
  }

  @Test
  public void testDurableClientStatistics() {

    // Step 1: Starting the servers
    PORT1 = ((Integer) this.server1VM
        .invoke(() -> CacheServerTestUtil.createCacheServer(regionName, new Boolean(true))))
            .intValue();
    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.checkStatistics());
    // Step 2: Bring Up the Client
    // Start a durable client that is not kept alive on the server when it
    // stops normally
    final int durableClientTimeout = 600; // keep the client alive for 600
    // seconds

    startAndCloseDurableClientCache(durableClientTimeout);
    startAndCloseDurableClientCache(1); //////// -> Reconnection1
    Wait.pause(1400); //////// -> Queue Dropped1
    startAndCloseDurableClientCache(1);
    Wait.pause(1400); //////// -> Queue Dropped2

    startRegisterAndCloseDurableClientCache(durableClientTimeout);
    Wait.pause(500);

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.putValue(K1, "Value1")); //////// ->
                                                                                     //////// Enqueue
                                                                                     //////// Message1

    Wait.pause(500);
    startAndCloseDurableClientCache(1); //////// -> Reconnection2
    Wait.pause(1400); //////// -> Queue Dropped3
    startAndCloseDurableClientCache(1);
    Wait.pause(1400); //////// -> Queue Dropped4
    startRegisterAndCloseDurableClientCache(durableClientTimeout);
    Wait.pause(500);

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest.putValue(K1, "NewValue1")); //////// ->
                                                                                        //////// Enqueue
                                                                                        //////// Message2

    startAndCloseDurableClientCache(durableClientTimeout); //////// -> Reconnection3

    this.server1VM.invoke(() -> DurableClientStatsDUnitTest
        .checkStatisticsWithExpectedValues(new Integer(3), new Integer(4), new Integer(2)));
  }

  public void startRegisterAndCloseDurableClientCache(int durableClientTimeout) {
    final String durableClientId = getName() + "_client";

    this.durableClientVM
        .invoke(() -> CacheServerTestUtil.createCacheClient(
            getClientPool(NetworkUtils.getServerHostName(durableClientVM.getHost()), PORT1, true,
                0),
            regionName,
            getDurableClientDistributedSystemProperties(durableClientId, durableClientTimeout),
            Boolean.TRUE));

    // Send clientReady message
    this.durableClientVM.invoke(new CacheSerializableRunnable("Send clientReady") {
      @Override
      public void run2() throws CacheException {
        CacheServerTestUtil.getCache().readyForEvents();
      }
    });

    this.durableClientVM
        .invoke(() -> DurableClientStatsDUnitTest.registerKey(K1, new Boolean(true)));

    this.durableClientVM.invoke(() -> DurableClientStatsDUnitTest.closeCache());
  }

  public void startRegisterAndCloseNonDurableClientCache(int durableClientTimeout) {
    final String durableClientId = getName() + "_client";

    this.durableClientVM
        .invoke(() -> CacheServerTestUtil.createCacheClient(
            getClientPool(NetworkUtils.getServerHostName(durableClientVM.getHost()), PORT1, true,
                0),
            regionName,
            getNonDurableClientDistributedSystemProperties(durableClientId, durableClientTimeout),
            Boolean.TRUE));

    // Send clientReady message
    // this.durableClientVM.invoke(new CacheSerializableRunnable(
    // "Send clientReady") {
    // public void run2() throws CacheException {
    // CacheServerTestUtil.getCache().readyForEvents();
    // }
    // });

    this.durableClientVM
        .invoke(() -> DurableClientStatsDUnitTest.registerKey(K1, new Boolean(false)));

    this.durableClientVM.invoke(() -> DurableClientStatsDUnitTest.closeCache());
  }

  public void startAndCloseDurableClientCache(int durableClientTimeout) {

    final String durableClientId = getName() + "_client";

    this.durableClientVM
        .invoke(() -> CacheServerTestUtil.createCacheClient(
            getClientPool(NetworkUtils.getServerHostName(durableClientVM.getHost()), PORT1, true,
                0),
            regionName,
            getDurableClientDistributedSystemProperties(durableClientId, durableClientTimeout),
            Boolean.TRUE));

    // Send clientReady message
    this.durableClientVM.invoke(new CacheSerializableRunnable("Send clientReady") {
      @Override
      public void run2() throws CacheException {
        CacheServerTestUtil.getCache().readyForEvents();
      }
    });

    this.durableClientVM.invoke(() -> DurableClientStatsDUnitTest.closeCache());

  }

  public void startAndCloseNonDurableClientCache(int durableClientTimeout) {

    final String durableClientId = getName() + "_client";

    this.durableClientVM
        .invoke(() -> CacheServerTestUtil.createCacheClient(
            getClientPool(NetworkUtils.getServerHostName(durableClientVM.getHost()), PORT1, true,
                0),
            regionName,
            getNonDurableClientDistributedSystemProperties(durableClientId, durableClientTimeout),
            Boolean.TRUE));

    // Send clientReady message
    // this.durableClientVM.invoke(new CacheSerializableRunnable(
    // "Send clientReady") {
    // public void run2() throws CacheException {
    // CacheServerTestUtil.getCache().readyForEvents();
    // }
    // });

    this.durableClientVM.invoke(() -> DurableClientStatsDUnitTest.closeCache());

  }

  public static void checkStatistics() {
    try {
      Cache cache = CacheServerTestUtil.getCache();
      org.apache.geode.LogWriter logger = cache.getLogger();
      CacheServerImpl currentServer =
          (CacheServerImpl) (new ArrayList(cache.getCacheServers()).get(0));
      AcceptorImpl ai = currentServer.getAcceptor();
      CacheClientNotifier notifier = ai.getCacheClientNotifier();
      CacheClientNotifierStats stats = notifier.getStats();
      logger.info("Stats:" + "\nDurableReconnectionCount:" + stats.get_durableReconnectionCount()
          + "\nQueueDroppedCount" + stats.get_queueDroppedCount()
          + "\nEventsEnqueuedWhileClientAwayCount" + stats.get_eventEnqueuedWhileClientAwayCount());
    } catch (Exception e) {
      fail("Exception thrown while executing checkStatistics()", e);
    }
  }

  public static void checkStatisticsWithExpectedValues(int reconnectionCount, int queueDropCount,
      int enqueueCount) {
    try {
      Cache cache = CacheServerTestUtil.getCache();
      org.apache.geode.LogWriter logger = cache.getLogger();
      CacheServerImpl currentServer =
          (CacheServerImpl) (new ArrayList(cache.getCacheServers()).get(0));
      AcceptorImpl ai = currentServer.getAcceptor();
      CacheClientNotifier notifier = ai.getCacheClientNotifier();
      CacheClientNotifierStats stats = notifier.getStats();
      logger.info("Stats:" + "\nDurableReconnectionCount:" + stats.get_durableReconnectionCount()
          + "\nQueueDroppedCount" + stats.get_queueDroppedCount()
          + "\nEventsEnqueuedWhileClientAwayCount" + stats.get_eventEnqueuedWhileClientAwayCount());
      assertEquals(reconnectionCount, stats.get_durableReconnectionCount());
      assertEquals(queueDropCount, stats.get_queueDroppedCount());
      assertEquals(enqueueCount, stats.get_eventEnqueuedWhileClientAwayCount());
    } catch (Exception e) {
      fail("Exception thrown while executing checkStatisticsWithExpectedValues()", e);
    }
  }

  public static void closeCache() {
    Cache cache = CacheServerTestUtil.getCache();
    if (cache != null && !cache.isClosed()) {
      // might fail in DataSerializerRecoveryListener.RecoveryTask in shutdown
      cache.getLogger().info("<ExpectedException action=add>"
          + RejectedExecutionException.class.getName() + "</ExpectedException>");
      cache.close(true);
      cache.getDistributedSystem().disconnect();
    }
  }

  private static void registerKey(String key, boolean isDurable) throws Exception {
    try {
      // Get the region
      Region region = CacheServerTestUtil.getCache()
          .getRegion(DurableClientStatsDUnitTest.class.getName() + "_region");
      // Region region =
      // CacheServerTestUtil.getCache().getRegion(regionName);
      assertNotNull(region);
      region.registerInterest(key, InterestResultPolicy.NONE, isDurable);
    } catch (Exception ex) {
      Assert.fail("failed while registering interest in registerKey function", ex);
    }
  }

  private static void putValue(String key, String value) {
    try {
      Region r = CacheServerTestUtil.getCache()
          .getRegion(DurableClientStatsDUnitTest.class.getName() + "_region");
      // Region r = CacheServerTestUtil.getCache().getRegion(regionName);
      assertNotNull(r);
      if (r.getEntry(key) != null) {
        r.put(key, value);
      } else {
        r.create(key, value);
      }
      assertEquals(value, r.getEntry(key).getValue());
    } catch (Exception e) {
      fail("Put in Server has some fight", e);
    }
  }

  private Pool getClientPool(String host, int server1Port, boolean establishCallbackConnection,
      int redundancyLevel) {
    PoolFactory pf = PoolManager.createFactory();
    pf.addServer(host, server1Port).setSubscriptionEnabled(establishCallbackConnection)
        .setSubscriptionRedundancy(redundancyLevel);
    return ((PoolFactoryImpl) pf).getPoolAttributes();
  }

  private Properties getDurableClientDistributedSystemProperties(String durableClientId,
      int durableClientTimeout) {
    Properties properties = new Properties();
    properties.setProperty(MCAST_PORT, "0");
    properties.setProperty(LOCATORS, "");
    properties.setProperty(DURABLE_CLIENT_ID, durableClientId);
    properties.setProperty(DURABLE_CLIENT_TIMEOUT, String.valueOf(durableClientTimeout));
    return properties;
  }

  private Properties getNonDurableClientDistributedSystemProperties(String durableClientId,
      int durableClientTimeout) {
    Properties properties = new Properties();
    properties.setProperty(MCAST_PORT, "0");
    properties.setProperty(LOCATORS, "");
    return properties;
  }
}
