/**
 * 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.transport.mqtt;

import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.net.Socket;
import java.util.Arrays;
import java.util.Collection;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import javax.net.ssl.SSLSocketFactory;

import org.apache.activemq.util.Wait;
import org.fusesource.mqtt.client.BlockingConnection;
import org.fusesource.mqtt.client.MQTT;
import org.junit.After;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Test that connection attempts that don't send a CONNECT frame will
 * get cleaned up by the inactivity monitor.
 */
@RunWith(Parameterized.class)
public class MQTTConnectTest extends MQTTTestSupport {

    private static final Logger LOG = LoggerFactory.getLogger(MQTTConnectTest.class);

    private Socket connection;

    @Parameters(name="{0}")
    public static Collection<Object[]> data() {
        return Arrays.asList(new Object[][] {
                {"mqtt", false},
                {"mqtt+ssl", true},
                {"mqtt+nio", false},
                {"mqtt+nio+ssl", true}
            });
    }

    public MQTTConnectTest(String connectorScheme, boolean useSSL) {
        super(connectorScheme, useSSL);
    }

    @Override
    @After
    public void tearDown() throws Exception {
        if (connection != null) {
            try {
                connection.close();
            } catch (Throwable e) {}
            connection = null;
        }
        super.tearDown();
    }

    @Override
    public String getProtocolConfig() {
        return "transport.connectAttemptTimeout=1000";
    }

    @Test(timeout = 90000)
    public void testParallelConnectPlain() throws Exception {
        final int THREAD_COUNT = 16;
        final int CONNECTION_COUNT = 100;
        ExecutorService executorService = Executors.newFixedThreadPool(THREAD_COUNT);
        final AtomicInteger clientIdGemeratpr = new AtomicInteger();
        for (int i = 0; i < CONNECTION_COUNT; i++) {
            executorService.execute(new Runnable() {
                @Override
                public void run() {

                    try {
                        MQTT mqtt = createMQTTConnection();
                        mqtt.setClientId("client-" + clientIdGemeratpr.incrementAndGet());
                        mqtt.setCleanSession(true);

                        BlockingConnection connection = mqtt.blockingConnection();
                        connection.connect();
                        connection.disconnect();
                    } catch (Exception e) {
                        LOG.error("unexpected exception on connect/disconnect", e);
                        exceptions.add(e);
                    }
                }
            });
        }

        executorService.shutdown();
        assertTrue("executor done on time", executorService.awaitTermination(60, TimeUnit.SECONDS));
    }

    @Test(timeout = 60 * 1000)
    public void testInactivityMonitor() throws Exception {

        Thread t1 = new Thread() {

            @Override
            public void run() {
                try {
                    connection = createConnection();
                    connection.getOutputStream().write(0);
                    connection.getOutputStream().flush();
                } catch (Exception ex) {
                    LOG.error("unexpected exception on connect/disconnect", ex);
                    exceptions.add(ex);
                }
            }
        };

        t1.start();

        assertTrue("one connection", Wait.waitFor(new Wait.Condition() {
             @Override
             public boolean isSatisified() throws Exception {
                 return 1 == brokerService.getTransportConnectors().get(0).connectionCount();
             }
         }, TimeUnit.SECONDS.toMillis(30), TimeUnit.MILLISECONDS.toMillis(100)));

        // and it should be closed due to inactivity
        assertTrue("no dangling connections", Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
                return 0 == brokerService.getTransportConnectors().get(0).connectionCount();
            }
        }, TimeUnit.SECONDS.toMillis(30), TimeUnit.MILLISECONDS.toMillis(100)));

        assertTrue("no exceptions", exceptions.isEmpty());
    }

    protected Socket createConnection() throws IOException {
        if (isUseSSL()) {
            return SSLSocketFactory.getDefault().createSocket("localhost", port);
        } else {
            return new Socket("localhost", port);
        }
    }
}