/**
 * 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.bugs;

import static org.junit.Assert.assertTrue;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.network.DiscoveryNetworkConnector;
import org.apache.activemq.network.NetworkConnector;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AMQ3274Test {
    private static final transient Logger LOG = LoggerFactory.getLogger(AMQ3274Test.class);

    protected static int Next_broker_num = 0;
    protected EmbeddedTcpBroker broker1;
    protected EmbeddedTcpBroker broker2;

    protected int nextEchoId = 0;
    protected boolean testError = false;

    protected int echoResponseFill = 0; // Number of "filler" response messages per request

    public AMQ3274Test() throws Exception {
        broker1 = new EmbeddedTcpBroker();
        broker2 = new EmbeddedTcpBroker();

        broker1.coreConnectTo(broker2, true);
        broker2.coreConnectTo(broker1, true);
    }

    public void logMessage(String msg) {
        System.out.println(msg);
        System.out.flush();
    }

    public void testMessages(Session sess, MessageProducer req_prod, Destination resp_dest, int num_msg) throws Exception {
        MessageConsumer resp_cons;
        TextMessage msg;
        MessageClient cons_client;
        int cur;
        int tot_expected;

        resp_cons = sess.createConsumer(resp_dest);

        cons_client = new MessageClient(resp_cons, num_msg);
        cons_client.start();

        cur = 0;
        while ((cur < num_msg) && (!testError)) {
            msg = sess.createTextMessage("MSG AAAA " + cur);
            msg.setIntProperty("SEQ", 100 + cur);
            msg.setStringProperty("TEST", "TOPO");
            msg.setJMSReplyTo(resp_dest);

            if (cur == (num_msg - 1))
                msg.setBooleanProperty("end-of-response", true);

            req_prod.send(msg);

            cur++;
        }

        cons_client.waitShutdown(5000);

        if (cons_client.shutdown()) {
            LOG.debug("Consumer client shutdown complete");
        } else {
            LOG.debug("Consumer client shutdown incomplete!!!");
        }

        tot_expected = num_msg * (echoResponseFill + 1);

        if (cons_client.getNumMsgReceived() == tot_expected) {
            LOG.info("Have " + tot_expected + " messages, as-expected");
        } else {
            LOG.error("Have " + cons_client.getNumMsgReceived() + " messages; expected " + tot_expected);
            testError = true;
        }

        resp_cons.close();
    }

    /**
     * Test one destination between the given "producer broker" and
     * "consumer broker" specified.
     */
    public void testOneDest(Connection conn, Session sess, Destination cons_dest, String prod_broker_url, String cons_broker_url, int num_msg) throws Exception {
        int echo_id;

        EchoService echo_svc;
        String echo_queue_name;
        Destination prod_dest;
        MessageProducer msg_prod;

        synchronized (this) {
            echo_id = this.nextEchoId;
            this.nextEchoId++;
        }

        echo_queue_name = "echo.queue." + echo_id;

        LOG.trace("destroying the echo queue in case an old one exists");
        removeQueue(conn, echo_queue_name);

        echo_svc = new EchoService(echo_queue_name, prod_broker_url);
        echo_svc.start();

        LOG.trace("Creating echo queue and producer");
        prod_dest = sess.createQueue(echo_queue_name);
        msg_prod = sess.createProducer(prod_dest);

        testMessages(sess, msg_prod, cons_dest, num_msg);

        echo_svc.shutdown();
        msg_prod.close();
    }

    /**
     * TEST TEMPORARY TOPICS
     */
    public void testTempTopic(String prod_broker_url, String cons_broker_url) throws Exception {
        Connection conn;
        Session sess;
        Destination cons_dest;
        int num_msg;

        num_msg = 5;

        LOG.info("TESTING TEMP TOPICS " + prod_broker_url + " -> " + cons_broker_url + " (" + num_msg + " messages)");

        conn = createConnection(cons_broker_url);
        conn.start();
        sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

        LOG.trace("Creating destination");
        cons_dest = sess.createTemporaryTopic();

        testOneDest(conn, sess, cons_dest, prod_broker_url, cons_broker_url, num_msg);

        sess.close();
        conn.close();
    }

    /**
     * TEST TOPICS
     */
    public void testTopic(String prod_broker_url, String cons_broker_url) throws Exception {
        int num_msg;

        Connection conn;
        Session sess;
        String topic_name;

        Destination cons_dest;

        num_msg = 5;

        LOG.info("TESTING TOPICS " + prod_broker_url + " -> " + cons_broker_url + " (" + num_msg + " messages)");

        conn = createConnection(cons_broker_url);
        conn.start();
        sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

        topic_name = "topotest2.perm.topic";
        LOG.trace("Removing existing Topic");
        removeTopic(conn, topic_name);
        LOG.trace("Creating Topic, " + topic_name);
        cons_dest = sess.createTopic(topic_name);

        testOneDest(conn, sess, cons_dest, prod_broker_url, cons_broker_url, num_msg);

        removeTopic(conn, topic_name);
        sess.close();
        conn.close();
    }

    /**
     * TEST TEMPORARY QUEUES
     */
    public void testTempQueue(String prod_broker_url, String cons_broker_url) throws Exception {
        int num_msg;

        Connection conn;
        Session sess;

        Destination cons_dest;

        num_msg = 5;

        LOG.info("TESTING TEMP QUEUES " + prod_broker_url + " -> " + cons_broker_url + " (" + num_msg + " messages)");

        conn = createConnection(cons_broker_url);
        conn.start();
        sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

        LOG.trace("Creating destination");
        cons_dest = sess.createTemporaryQueue();

        testOneDest(conn, sess, cons_dest, prod_broker_url, cons_broker_url, num_msg);

        sess.close();
        conn.close();
    }

    /**
     * TEST QUEUES
     */
    public void testQueue(String prod_broker_url, String cons_broker_url) throws Exception {
        int num_msg;

        Connection conn;
        Session sess;
        String queue_name;

        Destination cons_dest;

        num_msg = 5;

        LOG.info("TESTING QUEUES " + prod_broker_url + " -> " + cons_broker_url + " (" + num_msg + " messages)");

        conn = createConnection(cons_broker_url);
        conn.start();
        sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);

        queue_name = "topotest2.perm.queue";
        LOG.trace("Removing existing Queue");
        removeQueue(conn, queue_name);
        LOG.trace("Creating Queue, " + queue_name);
        cons_dest = sess.createQueue(queue_name);

        testOneDest(conn, sess, cons_dest, prod_broker_url, cons_broker_url, num_msg);

        removeQueue(conn, queue_name);
        sess.close();
        conn.close();
    }

    @Test
    public void run() throws Exception {
        Thread start1;
        Thread start2;

        testError = false;

        // Use threads to avoid startup deadlock since the first broker started waits until
        // it knows the name of the remote broker before finishing its startup, which means
        // the remote must already be running.

        start1 = new Thread() {
            public void run() {
                try {
                    broker1.start();
                } catch (Exception ex) {
                    LOG.error(null, ex);
                }
            }
        };

        start2 = new Thread() {
            public void run() {
                try {
                    broker2.start();
                } catch (Exception ex) {
                    LOG.error(null, ex);
                }
            }
        };

        start1.start();
        start2.start();

        start1.join();
        start2.join();

        if (!testError) {
            this.testTempTopic(broker1.getConnectionUrl(), broker2.getConnectionUrl());
        }
        if (!testError) {
            this.testTempQueue(broker1.getConnectionUrl(), broker2.getConnectionUrl());
        }
        if (!testError) {
            this.testTopic(broker1.getConnectionUrl(), broker2.getConnectionUrl());
        }
        if (!testError) {
            this.testQueue(broker1.getConnectionUrl(), broker2.getConnectionUrl());
        }
        Thread.sleep(100);

        shutdown();

        assertTrue(!testError);
    }

    public void shutdown() throws Exception {
        broker1.stop();
        broker2.stop();
    }

    /**
     * @param args
     *            the command line arguments
     */
    public static void main(String[] args) {
        AMQ3274Test main_obj;

        try {
            main_obj = new AMQ3274Test();
            main_obj.run();
        } catch (Exception ex) {
            ex.printStackTrace();
            LOG.error(null, ex);
            System.exit(0);
        }
    }

    protected Connection createConnection(String url) throws Exception {
        return org.apache.activemq.ActiveMQConnection.makeConnection(url);
    }

    protected static void removeQueue(Connection conn, String dest_name) throws java.lang.Exception {
        org.apache.activemq.command.ActiveMQDestination dest;

        if (conn instanceof org.apache.activemq.ActiveMQConnection) {
            dest = org.apache.activemq.command.ActiveMQDestination.createDestination(dest_name,
                    (byte) org.apache.activemq.command.ActiveMQDestination.QUEUE_TYPE);
            ((org.apache.activemq.ActiveMQConnection) conn).destroyDestination(dest);
        }
    }

    protected static void removeTopic(Connection conn, String dest_name) throws java.lang.Exception {
        org.apache.activemq.command.ActiveMQDestination dest;

        if (conn instanceof org.apache.activemq.ActiveMQConnection) {
            dest = org.apache.activemq.command.ActiveMQDestination.createDestination(dest_name,
                    (byte) org.apache.activemq.command.ActiveMQDestination.TOPIC_TYPE);
            ((org.apache.activemq.ActiveMQConnection) conn).destroyDestination(dest);
        }
    }

    @SuppressWarnings("rawtypes")
    public static String fmtMsgInfo(Message msg) throws Exception {
        StringBuilder msg_desc;
        String prop;
        Enumeration prop_enum;

        msg_desc = new StringBuilder();
        msg_desc = new StringBuilder();

        if (msg instanceof TextMessage) {
            msg_desc.append(((TextMessage) msg).getText());
        } else {
            msg_desc.append("[");
            msg_desc.append(msg.getClass().getName());
            msg_desc.append("]");
        }

        prop_enum = msg.getPropertyNames();
        while (prop_enum.hasMoreElements()) {
            prop = (String) prop_enum.nextElement();
            msg_desc.append("; ");
            msg_desc.append(prop);
            msg_desc.append("=");
            msg_desc.append(msg.getStringProperty(prop));
        }

        return msg_desc.toString();
    }

    // ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // /////////////////////////////////////////////// INTERNAL CLASSES
    // /////////////////////////////////////////////////
    // ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    protected class EmbeddedTcpBroker {
        protected BrokerService brokerSvc;
        protected int brokerNum;
        protected String brokerName;
        protected String brokerId;
        protected int port;
        protected String tcpUrl;

        public EmbeddedTcpBroker() throws Exception {
            brokerSvc = new BrokerService();

            synchronized (this.getClass()) {
                brokerNum = Next_broker_num;
                Next_broker_num++;
            }

            brokerName = "broker" + brokerNum;
            brokerId = "b" + brokerNum;

            brokerSvc.setBrokerName(brokerName);
            brokerSvc.setBrokerId(brokerId);
            brokerSvc.setPersistent(false);
            brokerSvc.setUseJmx(false);
            tcpUrl = brokerSvc.addConnector("tcp://localhost:0").getPublishableConnectString();
        }

        public Connection createConnection() throws URISyntaxException, JMSException {
            Connection result;

            result = org.apache.activemq.ActiveMQConnection.makeConnection(this.tcpUrl);

            return result;
        }

        public String getConnectionUrl() {
            return this.tcpUrl;
        }

        /**
         * Create network connections to the given broker using the
         * network-connector configuration of CORE brokers (e.g.
         * core1.bus.dev1.coresys.tmcs)
         *
         * @param other
         * @param duplex_f
         */
        public void coreConnectTo(EmbeddedTcpBroker other, boolean duplex_f) throws Exception {
            this.makeConnectionTo(other, duplex_f, true);
            this.makeConnectionTo(other, duplex_f, false);
        }

        public void start() throws Exception {
            brokerSvc.start();
        }

        public void stop() throws Exception {
            brokerSvc.stop();
        }

        /**
         * Make one connection to the other embedded broker, of the specified
         * type (queue or topic) using the standard CORE broker networking.
         *
         * @param other
         * @param duplex_f
         * @param queue_f
         * @throws Exception
         */
        protected void makeConnectionTo(EmbeddedTcpBroker other, boolean duplex_f, boolean queue_f) throws Exception {
            NetworkConnector nw_conn;
            String prefix;
            ActiveMQDestination excl_dest;
            ArrayList<ActiveMQDestination> excludes;

            nw_conn = new DiscoveryNetworkConnector(new URI("static:(" + other.tcpUrl + ")"));
            nw_conn.setDuplex(duplex_f);

            if (queue_f)
                nw_conn.setConduitSubscriptions(false);
            else
                nw_conn.setConduitSubscriptions(true);

            nw_conn.setNetworkTTL(5);
            nw_conn.setSuppressDuplicateQueueSubscriptions(true);
            nw_conn.setDecreaseNetworkConsumerPriority(true);
            nw_conn.setBridgeTempDestinations(true);

            if (queue_f) {
                prefix = "queue";
                excl_dest = ActiveMQDestination.createDestination(">", ActiveMQDestination.QUEUE_TYPE);
            } else {
                prefix = "topic";
                excl_dest = ActiveMQDestination.createDestination(">", ActiveMQDestination.TOPIC_TYPE);
            }

            excludes = new ArrayList<ActiveMQDestination>();
            excludes.add(excl_dest);
            nw_conn.setExcludedDestinations(excludes);

            if (duplex_f)
                nw_conn.setName(this.brokerId + "<-" + prefix + "->" + other.brokerId);
            else
                nw_conn.setName(this.brokerId + "-" + prefix + "->" + other.brokerId);

            brokerSvc.addNetworkConnector(nw_conn);
        }
    }

    protected class MessageClient extends java.lang.Thread {
        protected MessageConsumer msgCons;
        protected boolean shutdownInd;
        protected int expectedCount;
        protected int lastSeq = 0;
        protected int msgCount = 0;
        protected boolean haveFirstSeq;
        protected CountDownLatch shutdownLatch;

        public MessageClient(MessageConsumer cons, int num_to_expect) {
            msgCons = cons;
            expectedCount = (num_to_expect * (echoResponseFill + 1));
            shutdownLatch = new CountDownLatch(1);
        }

        public void run() {
            CountDownLatch latch;

            try {
                synchronized (this) {
                    latch = shutdownLatch;
                }

                shutdownInd = false;
                processMessages();

                latch.countDown();
            } catch (Exception exc) {
                LOG.error("message client error", exc);
            }
        }

        public void waitShutdown(long timeout) {
            CountDownLatch latch;

            try {
                synchronized (this) {
                    latch = shutdownLatch;
                }

                if (latch != null)
                    latch.await(timeout, TimeUnit.MILLISECONDS);
                else
                    LOG.info("echo client shutdown: client does not appear to be active");
            } catch (InterruptedException int_exc) {
                LOG.warn("wait for message client shutdown interrupted", int_exc);
            }
        }

        public boolean shutdown() {
            boolean down_ind;

            if (!shutdownInd) {
                shutdownInd = true;
            }

            waitShutdown(200);

            synchronized (this) {
                if ((shutdownLatch == null) || (shutdownLatch.getCount() == 0))
                    down_ind = true;
                else
                    down_ind = false;
            }

            return down_ind;
        }

        public int getNumMsgReceived() {
            return msgCount;
        }

        protected void processMessages() throws Exception {
            Message in_msg;

            haveFirstSeq = false;
            while ((!shutdownInd) && (!testError)) {
                in_msg = msgCons.receive(100);

                if (in_msg != null) {
                    msgCount++;
                    checkMessage(in_msg);
                }
            }
        }

        protected void checkMessage(Message in_msg) throws Exception {
            int seq;

            LOG.debug("received message " + fmtMsgInfo(in_msg));

            if (in_msg.propertyExists("SEQ")) {
                seq = in_msg.getIntProperty("SEQ");

                if ((haveFirstSeq) && (seq != (lastSeq + 1))) {
                    LOG.error("***ERROR*** incorrect sequence number; expected " + Integer.toString(lastSeq + 1) + " but have " + Integer.toString(seq));

                    testError = true;
                }

                lastSeq = seq;

                if (msgCount > expectedCount) {
                    LOG.warn("*** have more messages than expected; have " + msgCount + "; expect " + expectedCount);

                    testError = true;
                }
            }

            if (in_msg.propertyExists("end-of-response")) {
                LOG.trace("received end-of-response message");
                shutdownInd = true;
            }
        }
    }

    protected class EchoService extends java.lang.Thread {
        protected String destName;
        protected Connection jmsConn;
        protected Session sess;
        protected MessageConsumer msg_cons;
        protected boolean Shutdown_ind;

        protected Destination req_dest;
        protected Destination resp_dest;
        protected MessageProducer msg_prod;

        protected CountDownLatch waitShutdown;

        public EchoService(String dest, Connection broker_conn) throws Exception {
            destName = dest;
            jmsConn = broker_conn;

            Shutdown_ind = false;

            sess = jmsConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
            req_dest = sess.createQueue(destName);
            msg_cons = sess.createConsumer(req_dest);

            jmsConn.start();

            waitShutdown = new CountDownLatch(1);
        }

        public EchoService(String dest, String broker_url) throws Exception {
            this(dest, ActiveMQConnection.makeConnection(broker_url));
        }

        public void run() {
            Message req;

            try {
                LOG.info("STARTING ECHO SERVICE");

                while (!Shutdown_ind) {
                    req = msg_cons.receive(100);
                    if (req != null) {
                        if (LOG.isDebugEnabled())
                            LOG.debug("ECHO request message " + req.toString());

                        resp_dest = req.getJMSReplyTo();
                        if (resp_dest != null) {
                            msg_prod = sess.createProducer(resp_dest);
                            msg_prod.send(req);
                            msg_prod.close();
                            msg_prod = null;
                        } else {
                            LOG.warn("invalid request: no reply-to destination given");
                        }
                    }
                }
            } catch (Exception ex) {
                LOG.error(null, ex);
            } finally {
                LOG.info("shutting down test echo service");

                try {
                    jmsConn.stop();
                } catch (javax.jms.JMSException jms_exc) {
                    LOG.warn("error on shutting down JMS connection", jms_exc);
                }

                synchronized (this) {
                    waitShutdown.countDown();
                }
            }
        }

        /**
         * Shut down the service, waiting up to 3 seconds for the service to
         * terminate.
         */
        public void shutdown() {
            CountDownLatch wait_l;

            synchronized (this) {
                wait_l = waitShutdown;
            }

            Shutdown_ind = true;

            try {
                if (wait_l != null) {
                    if (wait_l.await(3000, TimeUnit.MILLISECONDS)) {
                        LOG.info("echo service shutdown complete");
                    } else {
                        LOG.warn("timeout waiting for echo service shutdown");
                    }
                } else {
                    LOG.info("echo service shutdown: service does not appear to be active");
                }
            } catch (InterruptedException int_exc) {
                LOG.warn("interrupted while waiting for echo service shutdown");
            }
        }
    }
}
