/*
 * 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.pulsar.broker.service;

import static org.apache.pulsar.broker.BrokerTestUtil.spyWithClassAndConstructorArgs;
import static org.mockito.Mockito.any;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;
import static org.testng.Assert.assertFalse;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicBoolean;
import lombok.Cleanup;
import org.apache.bookkeeper.mledger.ManagedCursor;
import org.apache.bookkeeper.mledger.ManagedLedger;
import org.apache.bookkeeper.mledger.ManagedLedgerConfig;
import org.apache.bookkeeper.mledger.ManagedLedgerFactory;
import org.apache.bookkeeper.mledger.Position;
import org.apache.bookkeeper.mledger.impl.ManagedLedgerFactoryImpl;
import org.apache.bookkeeper.test.MockedBookKeeperTestCase;
import org.apache.pulsar.broker.PulsarService;
import org.apache.pulsar.broker.ServiceConfiguration;
import org.apache.pulsar.broker.namespace.NamespaceService;
import org.apache.pulsar.broker.service.persistent.PersistentSubscription;
import org.apache.pulsar.broker.service.persistent.PersistentTopic;
import org.apache.pulsar.common.api.proto.CommandSubscribe;
import org.apache.pulsar.common.api.proto.CommandSubscribe.InitialPosition;
import org.apache.pulsar.common.naming.NamespaceBundle;
import org.apache.pulsar.common.naming.TopicName;
import org.apache.pulsar.common.policies.data.InactiveTopicDeleteMode;
import org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

@Test(groups = "broker")
public class PersistentTopicConcurrentTest extends MockedBookKeeperTestCase {

    private BrokerService brokerService;
    private ManagedLedgerFactory mlFactoryMock;
    private ServerCnx serverCnx;
    @SuppressWarnings("unused")
    private ManagedLedger ledgerMock;
    @SuppressWarnings("unused")
    private ManagedCursor cursorMock;

    final String successTopicName = "persistent://prop/use/ns-abc/successTopic";
    final String successSubName = "successSub";
    private static final Logger log = LoggerFactory.getLogger(PersistentTopicTest.class);

    @BeforeMethod
    public void setup(Method m) throws Exception {
        super.setUp(m);
        ServiceConfiguration svcConfig = new ServiceConfiguration();
        svcConfig.setBrokerShutdownTimeoutMs(0L);
        svcConfig.setLoadBalancerOverrideBrokerNicSpeedGbps(Optional.of(1.0d));
        @Cleanup
        PulsarService pulsar = spyWithClassAndConstructorArgs(PulsarService.class, svcConfig);
        doReturn(svcConfig).when(pulsar).getConfiguration();

        @Cleanup(value = "shutdownGracefully")
        EventLoopGroup eventLoopGroup = new NioEventLoopGroup();

        mlFactoryMock = mock(ManagedLedgerFactory.class);
        ManagedLedgerFactory factory = new ManagedLedgerFactoryImpl(metadataStore, bkc);
        ManagedLedger ledger = factory.open("my_test_ledger", new ManagedLedgerConfig().setMaxEntriesPerLedger(2));
        cursorMock = ledger.openCursor("c1");
        ledgerMock = ledger;
        mlFactoryMock = factory;
        doReturn(mlFactoryMock).when(pulsar).getManagedLedgerFactory();

        brokerService = spyWithClassAndConstructorArgs(BrokerService.class, pulsar, eventLoopGroup);
        doReturn(brokerService).when(pulsar).getBrokerService();

        serverCnx = spyWithClassAndConstructorArgs(ServerCnx.class, pulsar);
        doReturn(true).when(serverCnx).isActive();

        NamespaceService nsSvc = mock(NamespaceService.class);
        doReturn(nsSvc).when(pulsar).getNamespaceService();
        doReturn(true).when(nsSvc).isServiceUnitOwned(any(NamespaceBundle.class));
        doReturn(true).when(nsSvc).isServiceUnitActive(any(TopicName.class));
        doReturn(CompletableFuture.completedFuture(true)).when(nsSvc).checkTopicOwnership(any(TopicName.class));

        final List<Position> addedEntries = new ArrayList<>();

        for (int i = 0; i < 100; i++) {
            Position pos = ledger.addEntry("entry".getBytes());
            addedEntries.add(pos);
        }
    }

    @Test(enabled = false)
    public void testConcurrentTopicAndSubscriptionDelete() throws Exception {
        // create topic
        final PersistentTopic topic = (PersistentTopic) brokerService.getOrCreateTopic(successTopicName).get();
        topic.initialize().join();
        CommandSubscribe cmd = new CommandSubscribe()
                .setConsumerId(1)
                .setTopic(successTopicName)
                .setSubscription(successSubName)
                .setRequestId(1)
                .setSubType(CommandSubscribe.SubType.Exclusive);

        SubscriptionOption subscriptionOption = getSubscriptionOption(cmd);

        Future<Consumer> f1 = topic.subscribe(subscriptionOption);
        f1.get();

        final CyclicBarrier barrier = new CyclicBarrier(2);
        final CountDownLatch counter = new CountDownLatch(2);
        final AtomicBoolean gotException = new AtomicBoolean(false);

        Thread deleter = new Thread(() -> {
            try {
                barrier.await();
                // assertTrue(topic.unsubscribe(successSubName).isDone());
                Thread.sleep(5, 0);
                log.info("deleter outcome is {}", topic.delete().get());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        Thread unsubscriber = new Thread(() -> {
            try {
                barrier.await();
                // do subscription delete
                ConcurrentOpenHashMap<String, PersistentSubscription> subscriptions = topic.getSubscriptions();
                PersistentSubscription ps = subscriptions.get(successSubName);
                // Thread.sleep(2,0);
                log.info("unsubscriber outcome is {}", ps.doUnsubscribe(ps.getConsumers().get(0)).get());
                // assertFalse(ps.delete().isCompletedExceptionally());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        deleter.start();
        unsubscriber.start();

        counter.await();
        assertFalse(gotException.get());
    }

    @Test(enabled = false)
    public void testConcurrentTopicGCAndSubscriptionDelete() throws Exception {
        // create topic
        final PersistentTopic topic = (PersistentTopic) brokerService.getOrCreateTopic(successTopicName).get();
        topic.initialize().join();
        CommandSubscribe cmd = new CommandSubscribe()
                .setConsumerId(1)
                .setTopic(successTopicName)
                .setSubscription(successSubName)
                .setRequestId(1)
                .setSubType(CommandSubscribe.SubType.Exclusive);

        SubscriptionOption subscriptionOption = getSubscriptionOption(cmd);

        Future<Consumer> f1 = topic.subscribe(subscriptionOption);
        f1.get();

        final CyclicBarrier barrier = new CyclicBarrier(2);
        final CountDownLatch counter = new CountDownLatch(2);
        final AtomicBoolean gotException = new AtomicBoolean(false);

        Thread deleter = new Thread(() -> {
            try {
                barrier.await();
                // assertTrue(topic.unsubscribe(successSubName).isDone());
                // Thread.sleep(5,0);
                log.info("{} forcing topic GC ", Thread.currentThread());
                for (int i = 0; i < 2000; i++) {
                    topic.getInactiveTopicPolicies().setMaxInactiveDurationSeconds(0);
                    topic.getInactiveTopicPolicies().setInactiveTopicDeleteMode(InactiveTopicDeleteMode.delete_when_no_subscriptions);
                    topic.checkGC();
                }
                log.info("GC done..");
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        Thread unsubscriber = new Thread(() -> {
            try {
                barrier.await();
                // do subscription delete
                ConcurrentOpenHashMap<String, PersistentSubscription> subscriptions = topic.getSubscriptions();
                PersistentSubscription ps = subscriptions.get(successSubName);
                // Thread.sleep(2,0);
                log.info("unsubscriber outcome is {}", ps.doUnsubscribe(ps.getConsumers().get(0)).get());
                // assertFalse(ps.delete().isCompletedExceptionally());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        deleter.start();
        unsubscriber.start();

        counter.await();
        assertFalse(gotException.get());
    }

    @Test(enabled = false)
    public void testConcurrentTopicDeleteAndUnsubscribe() throws Exception {
        // create topic
        final PersistentTopic topic = (PersistentTopic) brokerService.getOrCreateTopic(successTopicName).get();
        topic.initialize().join();
        CommandSubscribe cmd = new CommandSubscribe()
                .setConsumerId(1)
                .setTopic(successTopicName)
                .setSubscription(successSubName)
                .setRequestId(1)
                .setSubType(CommandSubscribe.SubType.Exclusive);

        SubscriptionOption subscriptionOption = getSubscriptionOption(cmd);

        Future<Consumer> f1 = topic.subscribe(subscriptionOption);
        f1.get();

        final CyclicBarrier barrier = new CyclicBarrier(2);
        final CountDownLatch counter = new CountDownLatch(2);
        final AtomicBoolean gotException = new AtomicBoolean(false);

        Thread deleter = new Thread(() -> {
            try {
                barrier.await();
                Thread.sleep(4, 700);
                log.info("deleter outcome is {}", topic.delete().get());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        Thread unsubscriber = new Thread(() -> {
            try {
                barrier.await();
                // Thread.sleep(2,0);
                // assertTrue(topic.unsubscribe(successSubName).isDone());
                ConcurrentOpenHashMap<String, PersistentSubscription> subscriptions = topic.getSubscriptions();
                PersistentSubscription ps = subscriptions.get(successSubName);
                log.info("unsubscribe result : {}", topic.unsubscribe(successSubName).get());
                log.info("closing consumer..");
                ps.getConsumers().get(0).close();
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        deleter.start();
        unsubscriber.start();

        counter.await();
        assertFalse(gotException.get());
    }

    @Test(enabled = false)
    public void testConcurrentTopicDeleteAndSubsUnsubscribe() throws Exception {
        // create topic
        final PersistentTopic topic = (PersistentTopic) brokerService.getOrCreateTopic(successTopicName).get();
        topic.initialize().join();
        CommandSubscribe cmd = new CommandSubscribe()
                .setConsumerId(1)
                .setTopic(successTopicName)
                .setSubscription(successSubName)
                .setRequestId(1)
                .setSubType(CommandSubscribe.SubType.Exclusive);

        SubscriptionOption subscriptionOption = getSubscriptionOption(cmd);

        Future<Consumer> f1 = topic.subscribe(subscriptionOption);
        f1.get();

        final CyclicBarrier barrier = new CyclicBarrier(2);
        final CountDownLatch counter = new CountDownLatch(2);
        final AtomicBoolean gotException = new AtomicBoolean(false);

        Thread deleter = new Thread(() -> {
            try {
                barrier.await();
                Thread.sleep(4, 730);
                log.info("@@@@@@@@ DELETER TH");
                log.info("deleter outcome is " + topic.delete().get());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        Thread unsubscriber = new Thread(() -> {
            try {
                barrier.await();
                log.info("&&&&&&&&& UNSUBSCRIBER TH");
                // Thread.sleep(2,0);
                // assertTrue(topic.unsubscribe(successSubName).isDone());
                ConcurrentOpenHashMap<String, PersistentSubscription> subscriptions = topic.getSubscriptions();
                PersistentSubscription ps = subscriptions.get(successSubName);
                log.info("unsubscribe result : " + ps.doUnsubscribe(ps.getConsumers().get(0)).get());
            } catch (Exception e) {
                e.printStackTrace();
                gotException.set(true);
            } finally {
                counter.countDown();
            }
        });

        deleter.start();
        unsubscriber.start();

        counter.await();
        assertFalse(gotException.get());
    }

    private SubscriptionOption getSubscriptionOption(CommandSubscribe cmd) {
        return SubscriptionOption.builder().cnx(serverCnx)
                .subscriptionName(cmd.getSubscription()).consumerId(cmd.getConsumerId()).subType(cmd.getSubType())
                .priorityLevel(0).consumerName(cmd.getConsumerName()).isDurable(cmd.isDurable()).startMessageId(null)
                .metadata(Collections.emptyMap()).readCompacted(cmd.isReadCompacted())
                .subscriptionProperties(java.util.Optional.empty())
                .initialPosition(InitialPosition.Latest)
                .startMessageRollbackDurationSec(0).replicatedSubscriptionStateArg(false).keySharedMeta(null)
                .build();
    }
}