/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.client5.http.impl.nio;
  
  import java.io.IOException;
  import java.net.SocketAddress;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSession;
  
  import org.apache.hc.client5.http.nio.ManagedAsyncClientConnection;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.EndpointDetails;
  import org.apache.hc.core5.http.HttpConnection;
  import org.apache.hc.core5.http.HttpVersion;
  import org.apache.hc.core5.http.ProtocolVersion;
  import org.apache.hc.core5.http.nio.command.ShutdownCommand;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.net.NamedEndpoint;
  import org.apache.hc.core5.reactor.Command;
  import org.apache.hc.core5.reactor.IOEventHandler;
  import org.apache.hc.core5.reactor.IOSession;
  import org.apache.hc.core5.reactor.ProtocolIOSession;
  import org.apache.hc.core5.reactor.ssl.SSLBufferMode;
  import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
  import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
  import org.apache.hc.core5.reactor.ssl.TlsDetails;
  import org.apache.hc.core5.reactor.ssl.TransportSecurityLayer;
  import org.apache.hc.core5.util.Identifiable;
  import org.apache.hc.core5.util.Timeout;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  final class DefaultManagedAsyncClientConnection implements ManagedAsyncClientConnection, Identifiable {
  
      private static final Logger LOG = LoggerFactory.getLogger(DefaultManagedAsyncClientConnection.class);
  
      private final IOSession ioSession;
      private final Timeout socketTimeout;
      private final AtomicBoolean closed;
  
      public DefaultManagedAsyncClientConnection(final IOSession ioSession) {
          this.ioSession = ioSession;
          this.socketTimeout = ioSession.getSocketTimeout();
          this.closed = new AtomicBoolean();
      }
  
      @Override
      public String getId() {
          return ioSession.getId();
      }
  
      @Override
      public void close(final CloseMode closeMode) {
          if (this.closed.compareAndSet(false, true)) {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("{} Shutdown connection {}", getId(), closeMode);
              }
              ioSession.close(closeMode);
          }
      }
  
      @Override
      public void close() throws IOException {
          if (this.closed.compareAndSet(false, true)) {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("{} Close connection", getId());
              }
              ioSession.enqueue(new ShutdownCommand(CloseMode.GRACEFUL), Command.Priority.IMMEDIATE);
          }
      }
  
      @Override
     public boolean isOpen() {
         return ioSession.isOpen();
     }
 
     @Override
     public void setSocketTimeout(final Timeout timeout) {
         ioSession.setSocketTimeout(timeout);
     }
 
     @Override
     public Timeout getSocketTimeout() {
         return ioSession.getSocketTimeout();
     }
 
     @Override
     public SocketAddress getRemoteAddress() {
         return ioSession.getRemoteAddress();
     }
 
     @Override
     public SocketAddress getLocalAddress() {
         return ioSession.getLocalAddress();
     }
 
     @Override
     public EndpointDetails getEndpointDetails() {
         final IOEventHandler handler = ioSession.getHandler();
         if (handler instanceof HttpConnection) {
             return ((HttpConnection) handler).getEndpointDetails();
         }
         return null;
     }
 
     @Override
     public ProtocolVersion getProtocolVersion() {
         final IOEventHandler handler = ioSession.getHandler();
         if (handler instanceof HttpConnection) {
             final ProtocolVersion version = ((HttpConnection) handler).getProtocolVersion();
             if (version != null) {
                 return version;
             }
         }
         return HttpVersion.DEFAULT;
     }
 
     @Override
     public void startTls(
             final SSLContext sslContext,
             final NamedEndpoint endpoint,
             final SSLBufferMode sslBufferMode,
             final SSLSessionInitializer initializer,
             final SSLSessionVerifier verifier,
             final Timeout handshakeTimeout,
             final FutureCallback<TransportSecurityLayer> callback) throws UnsupportedOperationException {
         if (LOG.isDebugEnabled()) {
             LOG.debug("{} start TLS", getId());
         }
         if (ioSession instanceof TransportSecurityLayer) {
             ((TransportSecurityLayer) ioSession).startTls(sslContext, endpoint, sslBufferMode, initializer, verifier,
                 handshakeTimeout, callback);
         } else {
             throw new UnsupportedOperationException("TLS upgrade not supported");
         }
     }
 
     @Override
     public void startTls(
             final SSLContext sslContext,
             final NamedEndpoint endpoint,
             final SSLBufferMode sslBufferMode,
             final SSLSessionInitializer initializer,
             final SSLSessionVerifier verifier,
             final Timeout handshakeTimeout) throws UnsupportedOperationException {
         startTls(sslContext, endpoint, sslBufferMode, initializer, verifier, handshakeTimeout, null);
     }
 
     @Override
     public TlsDetails getTlsDetails() {
         return ioSession instanceof TransportSecurityLayer ? ((TransportSecurityLayer) ioSession).getTlsDetails() : null;
     }
 
     @Override
     public SSLSession getSSLSession() {
         final TlsDetails tlsDetails = getTlsDetails();
         return tlsDetails != null ? tlsDetails.getSSLSession() : null;
     }
 
     @Override
     public void submitCommand(final Command command, final Command.Priority priority) {
         if (LOG.isDebugEnabled()) {
             LOG.debug("{} {} with {} priority", getId(), command.getClass().getSimpleName(), priority);
         }
         ioSession.enqueue(command, Command.Priority.IMMEDIATE);
     }
 
     @Override
     public void passivate() {
         ioSession.setSocketTimeout(Timeout.ZERO_MILLISECONDS);
     }
 
     @Override
     public void activate() {
         ioSession.setSocketTimeout(socketTimeout);
     }
 
     @Override
     public void switchProtocol(final String protocolId,
                                final FutureCallback<ProtocolIOSession> callback) throws UnsupportedOperationException {
         if (ioSession instanceof ProtocolIOSession) {
             ((ProtocolIOSession) ioSession).switchProtocol(protocolId, callback);
         } else {
             throw new UnsupportedOperationException("Protocol switch not supported");
         }
     }
 
 }