/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.network;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.util.Wait;

import javax.jms.Connection;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;

import static org.junit.Assert.assertEquals;

public class DrainBridgeTest {

    @org.junit.Test
    public void testDrain() throws Exception {
        prepareBrokerWithMessages();

        BrokerService target = prepareDrainTarget();

        BrokerService drainingBroker = new BrokerService();
        drainingBroker.setBrokerName("HOST");

        // add the draining bridge that subscribes to all queues and forwards on start - irrespective of demand
        NetworkConnector drainingNetworkConnector = drainingBroker.addNetworkConnector("static:(" + target.getTransportConnectorByScheme("tcp").getPublishableConnectString() + ")");
        drainingNetworkConnector.setStaticBridge(true);
        drainingNetworkConnector.setStaticallyIncludedDestinations(Arrays.asList(new ActiveMQDestination[]{new ActiveMQQueue(">")}));

        // ensure replay back to the origin is allowed
        PolicyMap policyMap = new PolicyMap();
        PolicyEntry defaultEntry = new PolicyEntry();
        defaultEntry.setExpireMessagesPeriod(0);
        ConditionalNetworkBridgeFilterFactory filterFactory = new ConditionalNetworkBridgeFilterFactory();
        filterFactory.setReplayWhenNoConsumers(true);
        defaultEntry.setNetworkBridgeFilterFactory(filterFactory);
        policyMap.setDefaultEntry(defaultEntry); // applies to all destinations
        drainingBroker.setDestinationPolicy(policyMap);
        
        drainingBroker.start();

        System.out.println("Local count: " + drainingBroker.getAdminView().getTotalMessageCount() + ", target count:" + target.getAdminView().getTotalMessageCount());

        assertEquals("local messages", 20, drainingBroker.getAdminView().getTotalMessageCount());
        assertEquals("no remote messages", 0, target.getAdminView().getTotalMessageCount());

        Wait.waitFor(new Wait.Condition() {
            @Override
            public boolean isSatisified() throws Exception {
                return drainingBroker.getAdminView().getTotalMessageCount() == 0l;
            }
        });

        assertEquals("no local messages", 0, drainingBroker.getAdminView().getTotalMessageCount());
        assertEquals("remote messages", 20, target.getAdminView().getTotalMessageCount());

        drainingBroker.stop();
        target.stop();
    }

    private BrokerService prepareDrainTarget() throws Exception {
        BrokerService broker = new BrokerService();
        broker.setDeleteAllMessagesOnStartup(true);
        broker.setBrokerName("TARGET");
        broker.addConnector("tcp://localhost:0");
        broker.start();
        return broker;
    }

    private void prepareBrokerWithMessages() throws Exception {
        BrokerService broker = new BrokerService();
        broker.setDeleteAllMessagesOnStartup(true);
        broker.setBrokerName("HOST");
        broker.start();
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(broker.getVmConnectorURI());
        Connection conn = connectionFactory.createConnection();
        conn.start();
        Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
        TextMessage msg = session.createTextMessage("This is a message.");
        MessageProducer producer = session.createProducer(new ActiveMQQueue("Q.Foo,Bar"));
        for (int i = 0; i < 10; i++) {
            producer.send(msg);
        }
        conn.close();
        broker.stop();
    }
}