/*
    * Copyright 2021 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.netty.channel.kqueue;
  
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.channel.ChannelException;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.FixedRecvByteBufAllocator;
  import io.netty.channel.MessageSizeEstimator;
  import io.netty.channel.RecvByteBufAllocator;
  import io.netty.channel.WriteBufferWaterMark;
  import io.netty.channel.unix.DomainDatagramChannelConfig;
  import io.netty.util.internal.UnstableApi;
  
  import java.io.IOException;
  import java.util.Map;
  
  import static io.netty.channel.ChannelOption.DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION;
  import static io.netty.channel.ChannelOption.SO_SNDBUF;
  
  @UnstableApi
  public final class KQueueDomainDatagramChannelConfig
          extends KQueueChannelConfig implements DomainDatagramChannelConfig {
  
      private static final RecvByteBufAllocator DEFAULT_RCVBUF_ALLOCATOR = new FixedRecvByteBufAllocator(2048);
  
      private boolean activeOnOpen;
  
      KQueueDomainDatagramChannelConfig(KQueueDomainDatagramChannel channel) {
          super(channel);
          setRecvByteBufAllocator(DEFAULT_RCVBUF_ALLOCATOR);
      }
  
      @Override
      @SuppressWarnings("deprecation")
      public Map<ChannelOption<?>, Object> getOptions() {
          return getOptions(super.getOptions(),
                  DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION, SO_SNDBUF);
      }
  
      @Override
      @SuppressWarnings({"unchecked", "deprecation"})
      public <T> T getOption(ChannelOption<T> option) {
          if (option == DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION) {
              return (T) Boolean.valueOf(activeOnOpen);
          }
          if (option == SO_SNDBUF) {
              return (T) Integer.valueOf(getSendBufferSize());
          }
          return super.getOption(option);
      }
  
      @Override
      @SuppressWarnings("deprecation")
      public <T> boolean setOption(ChannelOption<T> option, T value) {
          validate(option, value);
  
          if (option == DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION) {
              setActiveOnOpen((Boolean) value);
          } else if (option == SO_SNDBUF) {
              setSendBufferSize((Integer) 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;
      }
  
      boolean getActiveOnOpen() {
          return activeOnOpen;
      }
  
      @Override
      public KQueueDomainDatagramChannelConfig setAllocator(ByteBufAllocator allocator) {
          super.setAllocator(allocator);
          return this;
      }
  
      @Override
     public KQueueDomainDatagramChannelConfig setAutoClose(boolean autoClose) {
         super.setAutoClose(autoClose);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
         super.setConnectTimeoutMillis(connectTimeoutMillis);
         return this;
     }
 
     @Override
     @Deprecated
     public KQueueDomainDatagramChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
         super.setMaxMessagesPerRead(maxMessagesPerRead);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setMaxMessagesPerWrite(int maxMessagesPerWrite) {
         super.setMaxMessagesPerWrite(maxMessagesPerWrite);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
         super.setMessageSizeEstimator(estimator);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setRcvAllocTransportProvidesGuess(boolean transportProvidesGuess) {
         super.setRcvAllocTransportProvidesGuess(transportProvidesGuess);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
         super.setRecvByteBufAllocator(allocator);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setSendBufferSize(int sendBufferSize) {
         try {
             ((KQueueDomainDatagramChannel) channel).socket.setSendBufferSize(sendBufferSize);
             return this;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public int getSendBufferSize() {
         try {
             return ((KQueueDomainDatagramChannel) channel).socket.getSendBufferSize();
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
         super.setWriteBufferWaterMark(writeBufferWaterMark);
         return this;
     }
 
     @Override
     public KQueueDomainDatagramChannelConfig setWriteSpinCount(int writeSpinCount) {
         super.setWriteSpinCount(writeSpinCount);
         return this;
     }
 }