/**
 * Copyright 2007-2016, Kaazing Corporation. 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 org.apache.mina.filter.keepalive;

import static org.apache.mina.filter.keepalive.KeepAliveRequestTimeoutHandler.*;

import java.net.InetSocketAddress;
import java.util.concurrent.atomic.AtomicBoolean;

import junit.framework.TestCase;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

/**
 * Tests {@link KeepAliveFilter} used by the connector with different
 * interested {@link IdleStatus}es.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class KeepAliveFilterTest extends TestCase {
    // Constants -----------------------------------------------------
    static final IoBuffer PING = IoBuffer.wrap(new byte[] { 1 });
    static final IoBuffer PONG = IoBuffer.wrap(new byte[] { 2 });
    private static final int INTERVAL = 2;
    private static final int TIMEOUT = 1;

    private int port;
    private NioSocketAcceptor acceptor;

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

        acceptor = new NioSocketAcceptor();
        KeepAliveMessageFactory factory = new ServerFactory();
        KeepAliveFilter filter = new KeepAliveFilter(factory,
                IdleStatus.BOTH_IDLE);
        acceptor.getFilterChain().addLast("keep-alive", filter);
        acceptor.setHandler(new IoHandlerAdapter());
        acceptor.setDefaultLocalAddress(new InetSocketAddress(0));
        acceptor.bind();
        port = acceptor.getLocalAddress().getPort();
    }

    @Override
    protected void tearDown() throws Exception {
        acceptor.unbind();
        acceptor.dispose();
        super.tearDown();
    }

    public void testKeepAliveFilterForReaderIdle() throws Exception {
        keepAliveFilterForIdleStatus(IdleStatus.READER_IDLE);
    }

    public void testKeepAliveFilterForBothIdle() throws Exception {
        keepAliveFilterForIdleStatus(IdleStatus.BOTH_IDLE);
    }

    public void testKeepAliveFilterForWriterIdle() throws Exception {
        keepAliveFilterForIdleStatus(IdleStatus.WRITER_IDLE);
    }

    // Package protected ---------------------------------------------

    // Protected -----------------------------------------------------

    // Private -------------------------------------------------------

    private void keepAliveFilterForIdleStatus(IdleStatus status)
            throws Exception {
        NioSocketConnector connector = new NioSocketConnector();
        KeepAliveFilter filter = new KeepAliveFilter(new ClientFactory(),
                status, EXCEPTION, INTERVAL, TIMEOUT);
        filter.setForwardEvent(true);
        connector.getFilterChain().addLast("keep-alive", filter);

        final AtomicBoolean gotException = new AtomicBoolean(false);
        connector.setHandler(new IoHandlerAdapter() {
            @Override
            public void exceptionCaught(IoSession session, Throwable cause)
                    throws Exception {
                //cause.printStackTrace();
                gotException.set(true);
            }

            @Override
            public void sessionIdle(IoSession session, IdleStatus status)
                    throws Exception {
                // Do nothing
            }
        });

        ConnectFuture future = connector.connect(
                new InetSocketAddress("127.0.0.1", port)).awaitUninterruptibly();
        IoSession session = future.getSession();
        assertNotNull(session);

        Thread.sleep((INTERVAL + TIMEOUT + 1) * 1000);

        assertFalse("got an exception on the client", gotException.get());

        session.close(true);
        connector.dispose();
    }

    static boolean checkRequest(IoBuffer message) {
        IoBuffer buff = message;
        boolean check = buff.get() == 1;
        buff.rewind();
        return check;
    }

    static boolean checkResponse(IoBuffer message) {
        IoBuffer buff = message;
        boolean check = buff.get() == 2;
        buff.rewind();
        return check;
    }

    // Inner classes -------------------------------------------------
    private final class ServerFactory implements KeepAliveMessageFactory {
        /**
         * Default constructor
         */
        public ServerFactory() {
            super();
        }
        
        public Object getRequest(IoSession session) {
            return null;
        }

        public Object getResponse(IoSession session, Object request) {
            return PONG.duplicate();
        }

        public boolean isRequest(IoSession session, Object message) {
            if (message instanceof IoBuffer) {
                return checkRequest((IoBuffer) message);
            }
            return false;
        }

        public boolean isResponse(IoSession session, Object message) {
            if (message instanceof IoBuffer) {
                return checkResponse((IoBuffer) message);
            }
            return false;
        }
    }

    private final class ClientFactory implements KeepAliveMessageFactory {
        /**
         * Default constructor
         */
        public ClientFactory() {
            super();
        }
        
        public Object getRequest(IoSession session) {
            return PING.duplicate();
        }

        public Object getResponse(IoSession session, Object request) {
            return null;
        }

        public boolean isRequest(IoSession session, Object message) {
            if (message instanceof IoBuffer) {
                return checkRequest((IoBuffer) message);
            }
            return false;
        }

        public boolean isResponse(IoSession session, Object message) {
            if (message instanceof IoBuffer) {
                return checkResponse((IoBuffer) message);
            }
            return false;
        }
    }
}
