/*
    * ====================================================================
    * 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.bootstrap;
  
  import java.util.concurrent.Future;
  
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.concurrent.CallbackContribution;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.function.Callback;
  import org.apache.hc.core5.function.Decorator;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncRequester;
  import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  import org.apache.hc.core5.http2.HttpVersionPolicy;
  import org.apache.hc.core5.http2.ssl.ApplicationProtocol;
  import org.apache.hc.core5.net.NamedEndpoint;
  import org.apache.hc.core5.pool.ManagedConnPool;
  import org.apache.hc.core5.reactor.IOEventHandlerFactory;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.reactor.IOSession;
  import org.apache.hc.core5.reactor.IOSessionListener;
  import org.apache.hc.core5.reactor.ProtocolIOSession;
  import org.apache.hc.core5.reactor.ssl.TlsDetails;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * Client side message exchange initiator capable of negotiating
   * HTTP/2 or HTTP/1.1 compatible connections.
   *
   * @since 5.0
   */
  public class H2AsyncRequester extends HttpAsyncRequester {
  
      private final HttpVersionPolicy versionPolicy;
  
      /**
       * Use {@link H2RequesterBootstrap} to create instances of this class.
       */
      @Internal
      public H2AsyncRequester(
              final HttpVersionPolicy versionPolicy,
              final IOReactorConfig ioReactorConfig,
              final IOEventHandlerFactory eventHandlerFactory,
              final Decorator<IOSession> ioSessionDecorator,
              final Callback<Exception> exceptionCallback,
              final IOSessionListener sessionListener,
              final ManagedConnPool<HttpHost, IOSession> connPool) {
          super(ioReactorConfig, eventHandlerFactory, ioSessionDecorator, exceptionCallback, sessionListener, connPool);
          this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
      }
  
      /**
       * Use {@link H2RequesterBootstrap} to create instances of this class.
       *
       * @since 5.2
       */
      @Internal
      public H2AsyncRequester(
              final HttpVersionPolicy versionPolicy,
              final IOReactorConfig ioReactorConfig,
              final IOEventHandlerFactory eventHandlerFactory,
              final Decorator<IOSession> ioSessionDecorator,
              final Callback<Exception> exceptionCallback,
              final IOSessionListener sessionListener,
              final ManagedConnPool<HttpHost, IOSession> connPool,
              final TlsStrategy tlsStrategy,
              final Timeout handshakeTimeout) {
          super(ioReactorConfig, eventHandlerFactory, ioSessionDecorator, exceptionCallback, sessionListener, connPool,
                  tlsStrategy, handshakeTimeout);
          this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
      }
  
     @Override
     protected Future<AsyncClientEndpoint> doConnect(
             final HttpHost host,
             final Timeout timeout,
             final Object attachment,
             final FutureCallback<AsyncClientEndpoint> callback) {
         return super.doConnect(host, timeout, attachment != null ? attachment : versionPolicy, callback);
     }
 
     @Override
     protected void doTlsUpgrade(final ProtocolIOSession ioSession,
                                 final NamedEndpoint endpoint,
                                 final FutureCallback<ProtocolIOSession> callback) {
         super.doTlsUpgrade(ioSession, endpoint, new CallbackContribution<ProtocolIOSession>(callback) {
 
             @Override
             public void completed(final ProtocolIOSession protocolSession) {
                 final boolean switchProtocol;
                 switch (versionPolicy) {
                     case FORCE_HTTP_2:
                         switchProtocol = true;
                         break;
                     case NEGOTIATE:
                         final TlsDetails tlsDetails = protocolSession.getTlsDetails();
                         final String appProtocol = tlsDetails != null ? tlsDetails.getApplicationProtocol() : null;
                         switchProtocol = ApplicationProtocol.HTTP_2.id.equals(appProtocol);
                         break;
                     default:
                         switchProtocol = false;
                 }
                 if (switchProtocol) {
                     protocolSession.switchProtocol(ApplicationProtocol.HTTP_2.id, callback);
                 } else {
                     if (callback != null) {
                         callback.completed(protocolSession);
                     }
                 }
             }
 
         });
     }
 
 }