/**
 * 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.ws;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.IOException;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.activemq.util.Wait;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.eclipse.jetty.websocket.client.ClientUpgradeRequest;
import org.eclipse.jetty.websocket.client.WebSocketClient;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.mqtt.codec.CONNACK;
import org.fusesource.mqtt.codec.CONNECT;
import org.fusesource.mqtt.codec.MQTTFrame;
import org.fusesource.mqtt.codec.PINGREQ;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class MQTTWSTransportTest extends WSTransportTestSupport {

    protected WebSocketClient wsClient;
    protected MQTTWSConnection wsMQTTConnection;
    protected ClientUpgradeRequest request;

    @Override
    @Before
    public void setUp() throws Exception {
        super.setUp();

        wsClient = new WebSocketClient(new SslContextFactory(true));
        wsClient.start();

        request = new ClientUpgradeRequest();
        request.setSubProtocols("mqttv3.1");

        wsMQTTConnection = new MQTTWSConnection();

        wsClient.connect(wsMQTTConnection, wsConnectUri, request);
        if (!wsMQTTConnection.awaitConnection(30, TimeUnit.SECONDS)) {
            throw new IOException("Could not connect to MQTT WS endpoint");
        }
    }

    @Override
    @After
    public void tearDown() throws Exception {
        if (wsMQTTConnection != null) {
            wsMQTTConnection.close();
            wsMQTTConnection = null;
            wsClient = null;
        }

        super.tearDown();
    }

    @Test(timeout = 60000)
    public void testConnectCycles() throws Exception {
        for (int i = 0; i < 10; ++i) {
            testConnect();

            wsMQTTConnection = new MQTTWSConnection();

            wsClient.connect(wsMQTTConnection, wsConnectUri, request);
            if (!wsMQTTConnection.awaitConnection(30, TimeUnit.SECONDS)) {
                throw new IOException("Could not connect to MQTT WS endpoint");
            }
        }
    }

    @Test(timeout = 60000)
    public void testConnect() throws Exception {

        wsMQTTConnection.connect();

        assertTrue("Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 1;
            }
        }));

        wsMQTTConnection.disconnect();
        wsMQTTConnection.close();

        assertTrue("Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 0;
            }
        }));
    }

    @Test(timeout = 60000)
    public void testConnectWithNoHeartbeatsClosesConnection() throws Exception {

        CONNECT command = new CONNECT();

        command.clientId(new UTF8Buffer(UUID.randomUUID().toString()));
        command.cleanSession(false);
        command.version(3);
        command.keepAlive((short) 2);

        wsMQTTConnection.sendFrame(command.encode());

        MQTTFrame received = wsMQTTConnection.receive(15, TimeUnit.SECONDS);
        if (received == null || received.messageType() != CONNACK.TYPE) {
            fail("Client did not get expected CONNACK");
        }

        assertTrue("Connection should open", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 1;
            }
        }));

        assertTrue("Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 0;
            }
        }));

        assertTrue("Client Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return !wsMQTTConnection.isConnected();
            }
        }));
    }

    @Test(timeout = 60000)
    public void testConnectWithHeartbeatsKeepsConnectionAlive() throws Exception {

        final AtomicBoolean done = new AtomicBoolean();

        CONNECT command = new CONNECT();

        command.clientId(new UTF8Buffer(UUID.randomUUID().toString()));
        command.cleanSession(false);
        command.version(3);
        command.keepAlive((short) 2);

        wsMQTTConnection.sendFrame(command.encode());

        MQTTFrame received = wsMQTTConnection.receive(15, TimeUnit.SECONDS);
        if (received == null || received.messageType() != CONNACK.TYPE) {
            fail("Client did not get expected CONNACK");
        }

        Thread pinger = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    while (!done.get()) {
                        TimeUnit.SECONDS.sleep(1);
                        wsMQTTConnection.sendFrame(new PINGREQ().encode());
                    }
                } catch (Exception e) {
                }
            }
        });

        pinger.start();

        assertTrue("Connection should open", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 1;
            }
        }));

        TimeUnit.SECONDS.sleep(10);

        assertTrue("Connection should still open", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 1;
            }
        }));

        wsMQTTConnection.disconnect();
        wsMQTTConnection.close();

        done.set(true);

        assertTrue("Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return getProxyToBroker().getCurrentConnectionsCount() == 0;
            }
        }));

        assertTrue("Client Connection should close", Wait.waitFor(new Wait.Condition() {

            @Override
            public boolean isSatisified() throws Exception {
                return !wsMQTTConnection.isConnected();
            }
        }));
    }
}
