/*
    * ====================================================================
    * 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.core5.http2.impl.nio;
  
  import java.io.IOException;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.impl.nio.ServerHttp1IOEventHandler;
  import org.apache.hc.core5.http.impl.nio.ServerHttp1StreamDuplexerFactory;
  import org.apache.hc.core5.reactor.ProtocolIOSession;
  import org.apache.hc.core5.reactor.ProtocolUpgradeHandler;
  import org.apache.hc.core5.reactor.ssl.TlsDetails;
  import org.apache.hc.core5.util.Args;
  
  /**
   * Protocol upgrade handler that upgrades the underlying {@link ProtocolIOSession}
   * to HTTP/1.1 in case of a successful protocol negotiation or as a default fall-back.
   *
   * @since 5.2
   */
  @Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
  @Internal
  public class ServerHttp1UpgradeHandler implements ProtocolUpgradeHandler {
  
      private final ServerHttp1StreamDuplexerFactory http1StreamHandlerFactory;
  
      public ServerHttp1UpgradeHandler(final ServerHttp1StreamDuplexerFactory http1StreamHandlerFactory) {
          this.http1StreamHandlerFactory = Args.notNull(http1StreamHandlerFactory, "HTTP/1.1 stream handler factory");
      }
  
      @Override
      public void upgrade(final ProtocolIOSession ioSession, final FutureCallback<ProtocolIOSession> callback) {
          final TlsDetails tlsDetails = ioSession.getTlsDetails();
          final ServerHttp1IOEventHandler eventHandler = new ServerHttp1IOEventHandler(http1StreamHandlerFactory.create(
                  tlsDetails != null ? URIScheme.HTTPS.id : URIScheme.HTTP.id,
                  ioSession));
          ioSession.upgrade(eventHandler);
          ioSession.upgrade(eventHandler);
          try {
              eventHandler.connected(ioSession);
              if (callback != null) {
                  callback.completed(ioSession);
              }
          } catch (final IOException ex) {
              eventHandler.exception(ioSession, ex);
          }
      }
  
  }