/*
    * ====================================================================
    * 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.compat;
  
  import java.io.IOException;
  import java.io.InterruptedIOException;
  import java.util.concurrent.Future;
  
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.Experimental;
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.concurrent.CancellableDependency;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * {@link CloseableHttpClient} implementation backed by {@link CloseableHttpAsyncClient}
   * acting as a compatibility bridge with the classic APIs based on the standard
   * {@link java.io.InputStream} / {@link java.io.OutputStream} model.
   *
   * @since 5.5
   */
  @Experimental
  @Internal
  @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
  public class ClassicToAsyncAdaptor extends CloseableHttpClient {
  
      private final CloseableHttpAsyncClient client;
      private final Timeout operationTimeout;
  
      public ClassicToAsyncAdaptor(final CloseableHttpAsyncClient client, final Timeout operationTimeout) {
          super();
          this.client = client;
          this.operationTimeout = operationTimeout;
      }
  
      @Override
      protected CloseableHttpResponse doExecute(
              final HttpHost target,
              final ClassicHttpRequest request,
              final HttpContext context) throws IOException {
          final ClassicToAsyncRequestProducer requestProducer = new ClassicToAsyncRequestProducer(request, operationTimeout);
          final ClassicToAsyncResponseConsumer responseConsumer = new ClassicToAsyncResponseConsumer(operationTimeout);
          final Future<Void> resultFuture = client.execute(target, requestProducer, responseConsumer, null, context, null);
          if (request instanceof CancellableDependency) {
              ((CancellableDependency) request).setDependency(() -> resultFuture.cancel(true));
          }
          try {
              requestProducer.blockWaiting().execute();
              final ClassicHttpResponse response = responseConsumer.blockWaiting();
              return CloseableHttpResponse.create(response,
                      (closeable, closeMode) -> {
                          try {
                              if (closeMode == CloseMode.GRACEFUL) {
                                  closeable.close();
                              }
                          } finally {
                              resultFuture.cancel(true);
                          }
                      });
          } catch (final InterruptedException ex) {
              Thread.currentThread().interrupt();
              throw new InterruptedIOException();
          }
      }
  
     @Override
     public void close() throws IOException {
         client.close();
     }
 
     @Override
     public void close(final CloseMode closeMode) {
         client.close(closeMode);
     }
 
 }