/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.incubator.http;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.SocketChannel;

import java.util.concurrent.CompletableFuture;

import java.util.function.Consumer;

import java.util.function.Supplier;

import javax.net.ssl.SSLEngine;

import javax.net.ssl.SSLParameters;

import jdk.incubator.http.internal.common.ByteBufferReference;

import jdk.incubator.http.internal.common.Utils;

/**

 * An SSL tunnel built on a Plain (CONNECT) TCP tunnel.

 */

class AsyncSSLTunnelConnection extends AbstractAsyncSSLConnection {

    final PlainTunnelingConnection plainConnection;

    final AsyncSSLDelegate sslDelegate;

    final String serverName;

    @Override

    public void connect() throws IOException, InterruptedException {

        plainConnection.connect();

        configureMode(Mode.ASYNC);

        startReading();

        sslDelegate.connect();

    }

    @Override

    boolean connected() {

        return plainConnection.connected() && sslDelegate.connected();

    }

    @Override

    public CompletableFuture<Void> connectAsync() {

        throw new InternalError();

    }

    AsyncSSLTunnelConnection(InetSocketAddress addr,

                        HttpClientImpl client,

                        String[] alpn,

                        InetSocketAddress proxy)

    {

        super(addr, client);

        this.serverName = Utils.getServerName(addr);

        this.plainConnection = new PlainTunnelingConnection(addr, proxy, client);

        this.sslDelegate = new AsyncSSLDelegate(plainConnection, client, alpn, serverName);

    }

    @Override

    synchronized void configureMode(Mode mode) throws IOException {

        super.configureMode(mode);

        plainConnection.configureMode(mode);

    }

    @Override

    SSLParameters sslParameters() {

        return sslDelegate.getSSLParameters();

    }

    @Override

    public String toString() {

        return "AsyncSSLTunnelConnection: " + super.toString();

    }

    @Override

    PlainTunnelingConnection plainConnection() {

        return plainConnection;

    }

    @Override

    AsyncSSLDelegate sslDelegate() {

        return sslDelegate;

    }

    @Override

    ConnectionPool.CacheKey cacheKey() {

        return ConnectionPool.cacheKey(address, plainConnection.proxyAddr);

    }

    @Override

    long write(ByteBuffer[] buffers, int start, int number) throws IOException {

        //debugPrint("Send", buffers, start, number);

        ByteBuffer[] bufs = Utils.reduce(buffers, start, number);

        long n = Utils.remaining(bufs);

        sslDelegate.writeAsync(ByteBufferReference.toReferences(bufs));

        sslDelegate.flushAsync();

        return n;

    }

    @Override

    long write(ByteBuffer buffer) throws IOException {

        //debugPrint("Send", buffer);

        long n = buffer.remaining();

        sslDelegate.writeAsync(ByteBufferReference.toReferences(buffer));

        sslDelegate.flushAsync();

        return n;

    }

    @Override

    public void writeAsync(ByteBufferReference[] buffers) throws IOException {

        sslDelegate.writeAsync(buffers);

    }

    @Override

    public void writeAsyncUnordered(ByteBufferReference[] buffers) throws IOException {

        sslDelegate.writeAsyncUnordered(buffers);

    }

    @Override

    public void flushAsync() throws IOException {

        sslDelegate.flushAsync();

    }

    @Override

    public void close() {

        Utils.close(sslDelegate, plainConnection.channel());

    }

    @Override

    void shutdownInput() throws IOException {

        plainConnection.channel().shutdownInput();

    }

    @Override

    void shutdownOutput() throws IOException {

        plainConnection.channel().shutdownOutput();

    }

    @Override

    SocketChannel channel() {

        return plainConnection.channel();

    }

    @Override

    boolean isProxied() {

        return true;

    }

    @Override

    public void setAsyncCallbacks(Consumer<ByteBufferReference> asyncReceiver,

                                  Consumer<Throwable> errorReceiver,

                                  Supplier<ByteBufferReference> readBufferSupplier) {

        sslDelegate.setAsyncCallbacks(asyncReceiver, errorReceiver, readBufferSupplier);

        plainConnection.setAsyncCallbacks(sslDelegate::asyncReceive, errorReceiver, sslDelegate::getNetBuffer);

    }

    @Override

    public void startReading() {

        plainConnection.startReading();

        sslDelegate.startReading();

    }

    @Override

    public void stopAsyncReading() {

        plainConnection.stopAsyncReading();

    }

    @Override

    public void enableCallback() {

        sslDelegate.enableCallback();

    }

    @Override

    public void closeExceptionally(Throwable cause) throws IOException {

        Utils.close(cause, sslDelegate, plainConnection.channel());

    }

    @Override

    SSLEngine getEngine() {

        return sslDelegate.getEngine();

    }

    @Override

    SSLTunnelConnection downgrade() {

        return new SSLTunnelConnection(this);

    }

}