/*
    * Copyright 2018 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:
    *
    *   https://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.netty5.channel.socket.nio;
  
  import io.netty5.channel.ChannelException;
  import io.netty5.channel.ChannelOption;
  
  import java.io.IOException;
  import java.net.SocketOption;
  import java.net.StandardSocketOptions;
  import java.nio.channels.NetworkChannel;
  import java.nio.channels.ServerSocketChannel;
  
  /**
   * Provides {@link ChannelOption} over a given {@link java.net.SocketOption} which is then passed through the underlying
   * {@link java.nio.channels.NetworkChannel}.
   */
  public final class NioChannelOption<T> extends ChannelOption<T> {
  
      private final java.net.SocketOption<T> option;
  
      @SuppressWarnings("deprecation")
      private NioChannelOption(java.net.SocketOption<T> option) {
          super(option.name());
          this.option = option;
      }
  
      /**
       * Returns a {@link ChannelOption} for the given {@link java.net.SocketOption}.
       */
      public static <T> ChannelOption<T> of(java.net.SocketOption<T> option) {
          return new NioChannelOption<>(option);
      }
  
      // Internal helper methods to remove code duplication between Nio*Channel implementations.
      static <T> void setOption(NetworkChannel channel, SocketOption<T> option, T value) {
          if (channel instanceof ServerSocketChannel && option == java.net.StandardSocketOptions.IP_TOS) {
              // Skip IP_TOS as a workaround for a JDK bug:
              // See https://mail.openjdk.java.net/pipermail/nio-dev/2018-August/005365.html
              return;
          }
          try {
              channel.setOption(option, value);
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
  
      static <T> T getOption(NetworkChannel channel, SocketOption<T> option) {
          if (channel instanceof ServerSocketChannel && option == java.net.StandardSocketOptions.IP_TOS) {
              // Skip IP_TOS as a workaround for a JDK bug:
              // See https://mail.openjdk.java.net/pipermail/nio-dev/2018-August/005365.html
              return null;
          }
          try {
              return channel.getOption(option);
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
  
      static boolean isOptionSupported(NetworkChannel channel, SocketOption<?> option) {
          return channel.supportedOptions().contains(option);
      }
  
      @SuppressWarnings("unchecked")
      static <T> SocketOption<T> toSocketOption(ChannelOption<T> option) {
          if (option instanceof NioChannelOption<?>) {
              return ((NioChannelOption<T>) option).option;
          }
          if (option == SO_RCVBUF) {
              return (SocketOption<T>) StandardSocketOptions.SO_RCVBUF;
          }
          if (option == SO_SNDBUF) {
              return (SocketOption<T>) StandardSocketOptions.SO_SNDBUF;
          }
          if (option == TCP_NODELAY) {
              return (SocketOption<T>) StandardSocketOptions.TCP_NODELAY;
          }
          if (option == SO_KEEPALIVE) {
              return (SocketOption<T>) StandardSocketOptions.SO_KEEPALIVE;
          }
          if (option == SO_REUSEADDR) {
              return (SocketOption<T>) StandardSocketOptions.SO_REUSEADDR;
          }
          if (option == SO_LINGER) {
             return (SocketOption<T>) StandardSocketOptions.SO_LINGER;
         }
         if (option == SO_BROADCAST) {
             return (SocketOption<T>) StandardSocketOptions.SO_BROADCAST;
         }
         if (option == IP_MULTICAST_LOOP_DISABLED) {
             return (SocketOption<T>) StandardSocketOptions.IP_MULTICAST_LOOP;
         }
         if (option == IP_MULTICAST_IF) {
             return (SocketOption<T>) StandardSocketOptions.IP_MULTICAST_IF;
         }
         if (option == IP_MULTICAST_TTL) {
             return (SocketOption<T>) StandardSocketOptions.IP_MULTICAST_TTL;
         }
         if (option == IP_TOS) {
             return (SocketOption<T>) StandardSocketOptions.IP_TOS;
         }
         return null;
     }
 }