/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.channel.socket;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.NetworkInterface;
import java.net.SocketException;

import org.jboss.netty.channel.ChannelException;
import org.jboss.netty.channel.DefaultChannelConfig;
import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
import org.jboss.netty.channel.ReceiveBufferSizePredictor;
import org.jboss.netty.channel.ReceiveBufferSizePredictorFactory;
import org.jboss.netty.util.internal.ConversionUtil;

/**
 * The default {@link DatagramChannelConfig} implementation.
 */
public class DefaultDatagramChannelConfig extends DefaultChannelConfig
                                        implements DatagramChannelConfig {

    private static final ReceiveBufferSizePredictorFactory DEFAULT_PREDICTOR_FACTORY =
        new FixedReceiveBufferSizePredictorFactory(768);

    private final DatagramSocket socket;
    private volatile ReceiveBufferSizePredictor predictor;
    private volatile ReceiveBufferSizePredictorFactory predictorFactory = DEFAULT_PREDICTOR_FACTORY;

    /**
     * Creates a new instance.
     */
    public DefaultDatagramChannelConfig(DatagramSocket socket) {
        if (socket == null) {
            throw new NullPointerException("socket");
        }
        this.socket = socket;
    }

    @Override
    public boolean setOption(String key, Object value) {
        if (super.setOption(key, value)) {
            return true;
        }

        if (key.equals("broadcast")) {
            setBroadcast(ConversionUtil.toBoolean(value));
        } else if (key.equals("receiveBufferSize")) {
            setReceiveBufferSize(ConversionUtil.toInt(value));
        } else if (key.equals("sendBufferSize")) {
            setSendBufferSize(ConversionUtil.toInt(value));
        } else if (key.equals("receiveBufferSizePredictorFactory")) {
            setReceiveBufferSizePredictorFactory((ReceiveBufferSizePredictorFactory) value);
        } else if (key.equals("receiveBufferSizePredictor")) {
            setReceiveBufferSizePredictor((ReceiveBufferSizePredictor) value);
        } else if (key.equals("reuseAddress")) {
            setReuseAddress(ConversionUtil.toBoolean(value));
        } else if (key.equals("loopbackModeDisabled")) {
            setLoopbackModeDisabled(ConversionUtil.toBoolean(value));
        } else if (key.equals("interface")) {
            setInterface((InetAddress) value);
        } else if (key.equals("networkInterface")) {
            setNetworkInterface((NetworkInterface) value);
        } else if (key.equals("timeToLive")) {
            setTimeToLive(ConversionUtil.toInt(value));
        } else if (key.equals("trafficClass")) {
            setTrafficClass(ConversionUtil.toInt(value));
        } else {
            return false;
        }
        return true;
    }

    public boolean isBroadcast() {
        try {
            return socket.getBroadcast();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public void setBroadcast(boolean broadcast) {
        try {
            socket.setBroadcast(broadcast);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public InetAddress getInterface() {
        if (socket instanceof MulticastSocket) {
            try {
                return ((MulticastSocket) socket).getInterface();
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public void setInterface(InetAddress interfaceAddress) {
        if (socket instanceof MulticastSocket) {
            try {
                ((MulticastSocket) socket).setInterface(interfaceAddress);
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public boolean isLoopbackModeDisabled() {
        if (socket instanceof MulticastSocket) {
            try {
                return ((MulticastSocket) socket).getLoopbackMode();
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public void setLoopbackModeDisabled(boolean loopbackModeDisabled) {
        if (socket instanceof MulticastSocket) {
            try {
                ((MulticastSocket) socket).setLoopbackMode(loopbackModeDisabled);
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public NetworkInterface getNetworkInterface() {
        if (socket instanceof MulticastSocket) {
            try {
                return ((MulticastSocket) socket).getNetworkInterface();
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public void setNetworkInterface(NetworkInterface networkInterface) {
        if (socket instanceof MulticastSocket) {
            try {
                ((MulticastSocket) socket).setNetworkInterface(networkInterface);
            } catch (SocketException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public boolean isReuseAddress() {
        try {
            return socket.getReuseAddress();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public void setReuseAddress(boolean reuseAddress) {
        try {
            socket.setReuseAddress(reuseAddress);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public int getReceiveBufferSize() {
        try {
            return socket.getReceiveBufferSize();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public void setReceiveBufferSize(int receiveBufferSize) {
        try {
            socket.setReceiveBufferSize(receiveBufferSize);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public int getSendBufferSize() {
        try {
            return socket.getSendBufferSize();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public void setSendBufferSize(int sendBufferSize) {
        try {
            socket.setSendBufferSize(sendBufferSize);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public int getTimeToLive() {
        if (socket instanceof MulticastSocket) {
            try {
                return ((MulticastSocket) socket).getTimeToLive();
            } catch (IOException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public void setTimeToLive(int ttl) {
        if (socket instanceof MulticastSocket) {
            try {
                ((MulticastSocket) socket).setTimeToLive(ttl);
            } catch (IOException e) {
                throw new ChannelException(e);
            }
        } else {
            throw new UnsupportedOperationException();
        }
    }

    public int getTrafficClass() {
        try {
            return socket.getTrafficClass();
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public void setTrafficClass(int trafficClass) {
        try {
            socket.setTrafficClass(trafficClass);
        } catch (SocketException e) {
            throw new ChannelException(e);
        }
    }

    public ReceiveBufferSizePredictor getReceiveBufferSizePredictor() {
        ReceiveBufferSizePredictor predictor = this.predictor;
        if (predictor == null) {
            try {
                this.predictor = predictor = getReceiveBufferSizePredictorFactory().getPredictor();
            } catch (Exception e) {
                throw new ChannelException(
                        "Failed to create a new " +
                        ReceiveBufferSizePredictor.class.getSimpleName() + '.',
                        e);
            }
        }
        return predictor;
    }

    public void setReceiveBufferSizePredictor(
            ReceiveBufferSizePredictor predictor) {
        if (predictor == null) {
            throw new NullPointerException("predictor");
        }
        this.predictor = predictor;
    }

    public ReceiveBufferSizePredictorFactory getReceiveBufferSizePredictorFactory() {
        return predictorFactory;
    }

    public void setReceiveBufferSizePredictorFactory(ReceiveBufferSizePredictorFactory predictorFactory) {
        if (predictorFactory == null) {
            throw new NullPointerException("predictorFactory");
        }
        this.predictorFactory = predictorFactory;
    }
}
