/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 io.undertow.client.ajp;

import io.undertow.UndertowOptions;
import io.undertow.client.ClientCallback;
import io.undertow.client.ClientConnection;
import io.undertow.client.ClientProvider;
import io.undertow.client.ClientStatistics;
import io.undertow.conduits.ByteActivityCallback;
import io.undertow.conduits.BytesReceivedStreamSourceConduit;
import io.undertow.conduits.BytesSentStreamSinkConduit;
import io.undertow.protocols.ajp.AjpClientChannel;

import org.xnio.ChannelListener;
import org.xnio.IoFuture;
import org.xnio.OptionMap;
import io.undertow.connector.ByteBufferPool;
import org.xnio.StreamConnection;
import org.xnio.XnioIoThread;
import org.xnio.XnioWorker;
import org.xnio.ssl.XnioSsl;

import java.net.InetSocketAddress;
import java.net.URI;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

/**
 * @author Stuart Douglas
 */
public class AjpClientProvider implements ClientProvider {

    @Override
    public Set<String> handlesSchemes() {
        return new HashSet<>(Arrays.asList(new String[]{"ajp"}));
    }

    @Override
    public void connect(final ClientCallback<ClientConnection> listener, final URI uri, final XnioWorker worker, final XnioSsl ssl, final ByteBufferPool bufferPool, final OptionMap options) {
        connect(listener, null, uri, worker, ssl, bufferPool, options);
    }

    @Override
    public void connect(final ClientCallback<ClientConnection> listener, final URI uri, final XnioIoThread ioThread, final XnioSsl ssl, final ByteBufferPool bufferPool, final OptionMap options) {
        connect(listener, null, uri, ioThread, ssl, bufferPool, options);
    }

    @Override
    public void connect(final ClientCallback<ClientConnection> listener, InetSocketAddress bindAddress, final URI uri, final XnioWorker worker, final XnioSsl ssl, final ByteBufferPool bufferPool, final OptionMap options) {
        ChannelListener<StreamConnection> openListener = new ChannelListener<StreamConnection>() {
            @Override
            public void handleEvent(StreamConnection connection) {
                handleConnected(connection, listener, uri, ssl, bufferPool, options);
            }
        };
        IoFuture.Notifier<StreamConnection, Object> notifier = new IoFuture.Notifier<StreamConnection, Object>() {
            @Override
            public void notify(IoFuture<? extends StreamConnection> ioFuture, Object o) {
                if (ioFuture.getStatus() == IoFuture.Status.FAILED) {
                    listener.failed(ioFuture.getException());
                }
            }
        };
        if(bindAddress == null) {
            worker.openStreamConnection(new InetSocketAddress(uri.getHost(), uri.getPort() == -1 ? 8009 : uri.getPort()), openListener, options).addNotifier(notifier, null);
        } else {
            worker.openStreamConnection(bindAddress, new InetSocketAddress(uri.getHost(), uri.getPort() == -1 ? 8009 : uri.getPort()), openListener, null, options).addNotifier(notifier, null);
        }
    }

    @Override
    public void connect(final ClientCallback<ClientConnection> listener, InetSocketAddress bindAddress,final URI uri, final XnioIoThread ioThread, final XnioSsl ssl, final ByteBufferPool bufferPool, final OptionMap options) {
        ChannelListener<StreamConnection> openListener = new ChannelListener<StreamConnection>() {
            @Override
            public void handleEvent(StreamConnection connection) {
                handleConnected(connection, listener, uri, ssl, bufferPool, options);
            }
        };
        IoFuture.Notifier<StreamConnection, Object> notifier = new IoFuture.Notifier<StreamConnection, Object>() {
            @Override
            public void notify(IoFuture<? extends StreamConnection> ioFuture, Object o) {
                if (ioFuture.getStatus() == IoFuture.Status.FAILED) {
                    listener.failed(ioFuture.getException());
                }
            }
        };
        if(bindAddress == null) {
            ioThread.openStreamConnection(new InetSocketAddress(uri.getHost(), uri.getPort() == -1 ? 8009 : uri.getPort()), openListener, options).addNotifier(notifier, null);
        } else {
            ioThread.openStreamConnection(bindAddress, new InetSocketAddress(uri.getHost(), uri.getPort() == -1 ? 8009 : uri.getPort()), openListener, null, options).addNotifier(notifier, null);
        }
    }

    private void handleConnected(StreamConnection connection, ClientCallback<ClientConnection> listener, URI uri, XnioSsl ssl, ByteBufferPool bufferPool, OptionMap options) {

        final ClientStatisticsImpl clientStatistics;
        //first we set up statistics, if required
        if (options.get(UndertowOptions.ENABLE_STATISTICS, false)) {
            clientStatistics = new ClientStatisticsImpl();
            connection.getSinkChannel().setConduit(new BytesSentStreamSinkConduit(connection.getSinkChannel().getConduit(), new ByteActivityCallback() {
                @Override
                public void activity(long bytes) {
                    clientStatistics.written += bytes;
                }
            }));
            connection.getSourceChannel().setConduit(new BytesReceivedStreamSourceConduit(connection.getSourceChannel().getConduit(), new ByteActivityCallback() {
                @Override
                public void activity(long bytes) {
                    clientStatistics.read += bytes;
                }
            }));
        } else {
            clientStatistics = null;
        }

        listener.completed(new AjpClientConnection(new AjpClientChannel(connection, bufferPool, options), options, bufferPool, clientStatistics));
    }


    private static class ClientStatisticsImpl implements ClientStatistics {
        private long requestCount, read, written;
        @Override
        public long getRequests() {
            return requestCount;
        }

        @Override
        public long getRead() {
            return read;
        }

        @Override
        public long getWritten() {
            return written;
        }

        @Override
        public void reset() {
            read = 0;
            written = 0;
            requestCount = 0;
        }
    }
}