/*
    * 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 io.netty.channel.socket;
  
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.channel.ChannelException;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.DefaultChannelConfig;
  import io.netty.channel.FixedRecvByteBufAllocator;
  import io.netty.channel.MessageSizeEstimator;
  import io.netty.channel.RecvByteBufAllocator;
  import io.netty.util.internal.PlatformDependent;
  import io.netty.util.internal.logging.InternalLogger;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  
  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 java.util.Map;
  
  import static io.netty.channel.ChannelOption.*;
  
  /**
   * The default {@link DatagramChannelConfig} implementation.
   */
  public class DefaultDatagramChannelConfig extends DefaultChannelConfig implements DatagramChannelConfig {
  
      private static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultDatagramChannelConfig.class);
  
      private static final RecvByteBufAllocator DEFAULT_RCVBUF_ALLOCATOR = new FixedRecvByteBufAllocator(2048);
  
      private final DatagramSocket javaSocket;
      private volatile boolean activeOnOpen;
  
      /**
       * Creates a new instance.
       */
      public DefaultDatagramChannelConfig(DatagramChannel channel, DatagramSocket javaSocket) {
          super(channel);
          if (javaSocket == null) {
              throw new NullPointerException("javaSocket");
          }
          this.javaSocket = javaSocket;
          setRecvByteBufAllocator(DEFAULT_RCVBUF_ALLOCATOR);
      }
  
      protected final DatagramSocket javaSocket() {
          return javaSocket;
      }
  
      @Override
      @SuppressWarnings("deprecation")
      public Map<ChannelOption<?>, Object> getOptions() {
          return getOptions(
                  super.getOptions(),
                  SO_BROADCAST, SO_RCVBUF, SO_SNDBUF, SO_REUSEADDR, IP_MULTICAST_LOOP_DISABLED,
                  IP_MULTICAST_ADDR, IP_MULTICAST_IF, IP_MULTICAST_TTL, IP_TOS, DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION);
      }
  
      @Override
      @SuppressWarnings({ "unchecked", "deprecation" })
      public <T> T getOption(ChannelOption<T> option) {
          if (option == SO_BROADCAST) {
              return (T) Boolean.valueOf(isBroadcast());
          }
          if (option == SO_RCVBUF) {
              return (T) Integer.valueOf(getReceiveBufferSize());
          }
          if (option == SO_SNDBUF) {
              return (T) Integer.valueOf(getSendBufferSize());
          }
          if (option == SO_REUSEADDR) {
              return (T) Boolean.valueOf(isReuseAddress());
          }
          if (option == IP_MULTICAST_LOOP_DISABLED) {
              return (T) Boolean.valueOf(isLoopbackModeDisabled());
          }
          if (option == IP_MULTICAST_ADDR) {
              return (T) getInterface();
          }
          if (option == IP_MULTICAST_IF) {
              return (T) getNetworkInterface();
          }
         if (option == IP_MULTICAST_TTL) {
             return (T) Integer.valueOf(getTimeToLive());
         }
         if (option == IP_TOS) {
             return (T) Integer.valueOf(getTrafficClass());
         }
         if (option == DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION) {
             return (T) Boolean.valueOf(activeOnOpen);
         }
         return super.getOption(option);
     }
 
     @Override
     @SuppressWarnings("deprecation")
     public <T> boolean setOption(ChannelOption<T> option, T value) {
         validate(option, value);
 
         if (option == SO_BROADCAST) {
             setBroadcast((Boolean) value);
         } else if (option == SO_RCVBUF) {
             setReceiveBufferSize((Integer) value);
         } else if (option == SO_SNDBUF) {
             setSendBufferSize((Integer) value);
         } else if (option == SO_REUSEADDR) {
             setReuseAddress((Boolean) value);
         } else if (option == IP_MULTICAST_LOOP_DISABLED) {
             setLoopbackModeDisabled((Boolean) value);
         } else if (option == IP_MULTICAST_ADDR) {
             setInterface((InetAddress) value);
         } else if (option == IP_MULTICAST_IF) {
             setNetworkInterface((NetworkInterface) value);
         } else if (option == IP_MULTICAST_TTL) {
             setTimeToLive((Integer) value);
         } else if (option == IP_TOS) {
             setTrafficClass((Integer) value);
         } else if (option == DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION) {
             setActiveOnOpen((Boolean) value);
         } else {
             return super.setOption(option, value);
         }
 
         return true;
     }
 
     private void setActiveOnOpen(boolean activeOnOpen) {
         if (channel.isRegistered()) {
             throw new IllegalStateException("Can only changed before channel was registered");
         }
         this.activeOnOpen = activeOnOpen;
     }
     @Override
     public boolean isBroadcast() {
         try {
             return javaSocket.getBroadcast();
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public DatagramChannelConfig setBroadcast(boolean broadcast) {
         try {
             // See: https://github.com/netty/netty/issues/576
             if (broadcast &&
                 !javaSocket.getLocalAddress().isAnyLocalAddress() &&
                 !PlatformDependent.isWindows() && !PlatformDependent.maybeSuperUser()) {
                 // Warn a user about the fact that a non-root user can't receive a
                 // broadcast packet on *nix if the socket is bound on non-wildcard address.
                 logger.warn(
                         "A non-root user can't receive a broadcast packet if the socket " +
                         "is not bound to a wildcard address; setting the SO_BROADCAST flag " +
                         "anyway as requested on the socket which is bound to " +
                         javaSocket.getLocalSocketAddress() + '.');
             }
 
             javaSocket.setBroadcast(broadcast);
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public InetAddress getInterface() {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 return ((MulticastSocket) javaSocket).getInterface();
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
     }
 
     @Override
     public DatagramChannelConfig setInterface(InetAddress interfaceAddress) {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 ((MulticastSocket) javaSocket).setInterface(interfaceAddress);
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
         return this;
     }
 
     @Override
     public boolean isLoopbackModeDisabled() {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 return ((MulticastSocket) javaSocket).getLoopbackMode();
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
     }
 
     @Override
     public DatagramChannelConfig setLoopbackModeDisabled(boolean loopbackModeDisabled) {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 ((MulticastSocket) javaSocket).setLoopbackMode(loopbackModeDisabled);
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
         return this;
     }
 
     @Override
     public NetworkInterface getNetworkInterface() {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 return ((MulticastSocket) javaSocket).getNetworkInterface();
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
     }
 
     @Override
     public DatagramChannelConfig setNetworkInterface(NetworkInterface networkInterface) {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 ((MulticastSocket) javaSocket).setNetworkInterface(networkInterface);
             } catch (SocketException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
         return this;
     }
 
     @Override
     public boolean isReuseAddress() {
         try {
             return javaSocket.getReuseAddress();
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public DatagramChannelConfig setReuseAddress(boolean reuseAddress) {
         try {
             javaSocket.setReuseAddress(reuseAddress);
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public int getReceiveBufferSize() {
         try {
             return javaSocket.getReceiveBufferSize();
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public DatagramChannelConfig setReceiveBufferSize(int receiveBufferSize) {
         try {
             javaSocket.setReceiveBufferSize(receiveBufferSize);
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public int getSendBufferSize() {
         try {
             return javaSocket.getSendBufferSize();
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public DatagramChannelConfig setSendBufferSize(int sendBufferSize) {
         try {
             javaSocket.setSendBufferSize(sendBufferSize);
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public int getTimeToLive() {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 return ((MulticastSocket) javaSocket).getTimeToLive();
             } catch (IOException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
     }
 
     @Override
     public DatagramChannelConfig setTimeToLive(int ttl) {
         if (javaSocket instanceof MulticastSocket) {
             try {
                 ((MulticastSocket) javaSocket).setTimeToLive(ttl);
             } catch (IOException e) {
                 throw new ChannelException(e);
             }
         } else {
             throw new UnsupportedOperationException();
         }
         return this;
     }
 
     @Override
     public int getTrafficClass() {
         try {
             return javaSocket.getTrafficClass();
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public DatagramChannelConfig setTrafficClass(int trafficClass) {
         try {
             javaSocket.setTrafficClass(trafficClass);
         } catch (SocketException e) {
             throw new ChannelException(e);
         }
         return this;
     }
 
     @Override
     public DatagramChannelConfig setWriteSpinCount(int writeSpinCount) {
         super.setWriteSpinCount(writeSpinCount);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
         super.setConnectTimeoutMillis(connectTimeoutMillis);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
         super.setMaxMessagesPerRead(maxMessagesPerRead);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setAllocator(ByteBufAllocator allocator) {
         super.setAllocator(allocator);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
         super.setRecvByteBufAllocator(allocator);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setAutoClose(boolean autoClose) {
         super.setAutoClose(autoClose);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
         super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
         super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
         return this;
     }
 
     @Override
     public DatagramChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
         super.setMessageSizeEstimator(estimator);
         return this;
     }
 }