/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.client.topic;

import com.hazelcast.client.HazelcastClient;
import com.hazelcast.client.config.ClientConfig;
import com.hazelcast.client.config.ClientReliableTopicConfig;
import com.hazelcast.config.Config;
import com.hazelcast.config.RingbufferConfig;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.ITopic;
import com.hazelcast.core.Message;
import com.hazelcast.core.MessageListener;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.test.AssertTask;
import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.TestThread;
import com.hazelcast.test.annotation.NightlyTest;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.concurrent.atomic.AtomicBoolean;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertEquals;

@RunWith(HazelcastSerialClassRunner.class)
@Category(NightlyTest.class)
public class ClientReliableTopicStressTest extends HazelcastTestSupport {

    private ILogger logger;

    private final AtomicBoolean stop = new AtomicBoolean();
    private ITopic<Long> topic;

    @Before
    public void setup() {
        logger = Logger.getLogger(getClass());

        Config config = new Config();

        RingbufferConfig ringbufferConfig = new RingbufferConfig("foobar");
        ringbufferConfig.setCapacity(10000000);
        ringbufferConfig.setTimeToLiveSeconds(5);
        config.addRingBufferConfig(ringbufferConfig);

        ClientConfig clientConfig = new ClientConfig();
        ClientReliableTopicConfig topicConfig = new ClientReliableTopicConfig("foobar");
        clientConfig.addReliableTopicConfig(topicConfig);

        HazelcastInstance hz = Hazelcast.newHazelcastInstance(config);
        HazelcastInstance client = HazelcastClient.newHazelcastClient(clientConfig);
        topic = client.getReliableTopic(topicConfig.getName());
    }

    @After
    public void teardown() {
        HazelcastClient.shutdownAll();
        Hazelcast.shutdownAll();
    }

    @Test
    public void test() throws InterruptedException {
        final StressMessageListener listener1 = new StressMessageListener(1);
        topic.addMessageListener(listener1);
        final StressMessageListener listener2 = new StressMessageListener(2);
        topic.addMessageListener(listener2);

        sleepSeconds(5);

        final ProduceThread produceThread = new ProduceThread();
        produceThread.start();

        logger.info("Starting test");
        sleepAndStop(stop, SECONDS.toSeconds(30));
        logger.info("Completed");

        produceThread.assertSucceedsEventually();

        logger.info("Number of items produced: " + produceThread.send);

        assertTrueEventually(new AssertTask() {
            @Override
            public void run() throws Exception {
                assertEquals(produceThread.send, listener1.received);
                assertEquals(produceThread.send, listener2.received);

                assertEquals(0, listener1.failures);
                assertEquals(0, listener2.failures);
            }
        });

        logger.info("Done");
    }

    public class ProduceThread extends TestThread {
        private volatile long send = 0;

        @Override
        public void onError(Throwable t) {
            stop.set(true);
        }

        @Override
        public void doRun() throws Throwable {
            while (!stop.get()) {
                topic.publish(send);
                send++;

                if (send % 10000 == 0) {
                    logger.info("Publishing: " + send);
                }
            }
        }
    }

    public class StressMessageListener implements MessageListener<Long> {
        private final int id;
        private long received = 0;
        private long failures = 0;

        public StressMessageListener(int id) {
            this.id = id;
        }

        @Override
        public void onMessage(Message<Long> message) {
            if (!message.getMessageObject().equals(received)) {
                failures++;
            }

            if (received % 10000 == 0) {
                logger.info(toString() + " is at: " + received);
            }

            received++;
        }

        @Override
        public String toString() {
            return "StressMessageListener-" + id;
        }
    }
}