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/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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.xnio.nio;

import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.Channel;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.Pipe;
import java.nio.channels.SelectionKey;
import org.xnio.Option;
import org.xnio.Options;

import static org.xnio.IoUtils.safeClose;

/**
 * @author David M. Lloyd
 */
final class NioPipeStreamConnection extends AbstractNioStreamConnection {
    private final Pipe.SourceChannel sourceChannel;
    private final Pipe.SinkChannel sinkChannel;
    private final NioPipeSourceConduit sourceConduit;
    private final NioPipeSinkConduit sinkConduit;

    NioPipeStreamConnection(final WorkerThread workerThread, final SelectionKey sourceKey, final SelectionKey sinkKey) {
        super(workerThread);
        if (sourceKey != null) {
            setSourceConduit(sourceConduit = new NioPipeSourceConduit(workerThread, sourceKey, this));
            sourceKey.attach(sourceConduit);
            sourceChannel = (Pipe.SourceChannel) sourceKey.channel();
        } else {
            sourceConduit = null;
            sourceChannel = null;
        }
        if (sinkKey != null) {
            setSinkConduit(sinkConduit = new NioPipeSinkConduit(workerThread, sinkKey, this));
            sinkKey.attach(sinkConduit);
            sinkChannel = (Pipe.SinkChannel) sinkKey.channel();
        } else {
            sinkConduit = null;
            sinkChannel = null;
        }
    }

    public SocketAddress getPeerAddress() {
        return null;
    }

    public SocketAddress getLocalAddress() {
        return null;
    }

    protected boolean readClosed() {
        return super.readClosed();
    }

    protected boolean writeClosed() {
        return super.writeClosed();
    }

    protected void notifyWriteClosed() {
        final NioPipeSinkConduit conduit = sinkConduit;
        if (conduit != null) conduit.writeTerminated();
    }

    protected void notifyReadClosed() {
        final NioPipeSourceConduit conduit = sourceConduit;
        if (conduit != null) conduit.readTerminated();
    }

    private void cancelKey(final NioHandle handle) {
        if (handle != null) handle.getWorkerThread().cancelKey(handle.getSelectionKey());
    }

    private void closeChannel(final Channel channel) throws IOException {
        if (channel != null) try {
            channel.close();
        } catch (ClosedChannelException ignored) {}
    }

    protected void closeAction() throws IOException {
        try {
            cancelKey(sourceConduit);
            cancelKey(sinkConduit);
            closeChannel(sourceChannel);
            closeChannel(sinkChannel);
        } finally {
            safeClose(sourceChannel);
            safeClose(sinkChannel);
        }
    }

    public boolean supportsOption(final Option option) {
        return option == Options.READ_TIMEOUT && sourceConduit != null || option == Options.WRITE_TIMEOUT && sinkConduit != null;
    }

    public  T getOption(final Option option) throws IOException {
        if (option == Options.READ_TIMEOUT) {
            final NioPipeSourceConduit conduit = sourceConduit;
            return conduit == null ? null : option.cast(Integer.valueOf(conduit.getReadTimeout()));
        } else if (option == Options.WRITE_TIMEOUT) {
            final NioPipeSinkConduit conduit = sinkConduit;
            return conduit == null ? null : option.cast(Integer.valueOf(conduit.getWriteTimeout()));
        } else {
            return null;
        }
    }

    public  T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
        T result;
        if (option == Options.READ_TIMEOUT) {
            final NioPipeSourceConduit conduit = sourceConduit;
            result = conduit == null ? null : option.cast(Integer.valueOf(conduit.getAndSetReadTimeout(value == null ? 0 : Options.READ_TIMEOUT.cast(value).intValue())));
        } else if (option == Options.WRITE_TIMEOUT) {
            final NioPipeSinkConduit conduit = sinkConduit;
            result = conduit == null ? null : option.cast(Integer.valueOf(conduit.getAndSetWriteTimeout(value == null ? 0 : Options.WRITE_TIMEOUT.cast(value).intValue())));
        } else {
            return null;
        }
        return result;
    }

    Pipe.SourceChannel getSourcePipeChannel() {
        return sourceChannel;
    }

    Pipe.SinkChannel getSinkPipeChannel() {
        return sinkChannel;
    }
}