/*
    * ====================================================================
    * 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.examples;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.charset.StandardCharsets;
  import java.util.concurrent.Future;
  import java.util.concurrent.atomic.AtomicLong;
  
  import org.apache.hc.client5.http.async.AsyncExecCallback;
  import org.apache.hc.client5.http.async.AsyncExecChain;
  import org.apache.hc.client5.http.async.AsyncExecChainHandler;
  import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
  import org.apache.hc.client5.http.async.methods.SimpleHttpRequests;
  import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
  import org.apache.hc.client5.http.impl.ChainElement;
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpRequestInterceptor;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.impl.BasicEntityDetails;
  import org.apache.hc.core5.http.message.BasicHttpResponse;
  import org.apache.hc.core5.http.nio.AsyncDataConsumer;
  import org.apache.hc.core5.http.nio.AsyncEntityProducer;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * This example demonstrates how to insert custom request interceptor and an execution interceptor
   * to the request execution chain.
   */
  public class AsyncClientInterceptors {
  
      public static void main(final String[] args) throws Exception {
  
          final IOReactorConfig ioReactorConfig = IOReactorConfig.custom()
                  .setSoTimeout(Timeout.ofSeconds(5))
                  .build();
  
          final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
                  .setIOReactorConfig(ioReactorConfig)
  
                  // Add a simple request ID to each outgoing request
  
                  .addRequestInterceptorFirst(new HttpRequestInterceptor() {
  
                      private final AtomicLong count = new AtomicLong(0);
  
                      @Override
                      public void process(
                              final HttpRequest request,
                              final EntityDetails entity,
                              final HttpContext context) throws HttpException, IOException {
                          request.setHeader("request-id", Long.toString(count.incrementAndGet()));
                      }
                  })
  
                  // Simulate a 404 response for some requests without passing the message down to the backend
  
                  .addExecInterceptorAfter(ChainElement.PROTOCOL.name(), "custom", new AsyncExecChainHandler() {
  
                      @Override
                      public void execute(
                              final HttpRequest request,
                             final AsyncEntityProducer requestEntityProducer,
                             final AsyncExecChain.Scope scope,
                             final AsyncExecChain chain,
                             final AsyncExecCallback asyncExecCallback) throws HttpException, IOException {
                         final Header idHeader = request.getFirstHeader("request-id");
                         if (idHeader != null && "13".equalsIgnoreCase(idHeader.getValue())) {
                             final HttpResponse response = new BasicHttpResponse(HttpStatus.SC_NOT_FOUND, "Oppsie");
                             final ByteBuffer content = ByteBuffer.wrap("bad luck".getBytes(StandardCharsets.US_ASCII));
                             final AsyncDataConsumer asyncDataConsumer = asyncExecCallback.handleResponse(
                                     response,
                                     new BasicEntityDetails(content.remaining(), ContentType.TEXT_PLAIN));
                             asyncDataConsumer.consume(content);
                             asyncDataConsumer.streamEnd(null);
                         } else {
                             chain.proceed(request, requestEntityProducer, scope, asyncExecCallback);
                         }
                     }
 
                 })
 
                 .build();
 
         client.start();
 
         final String requestUri = "http://httpbin.org/get";
         for (int i = 0; i < 20; i++) {
             final SimpleHttpRequest httpget = SimpleHttpRequests.get(requestUri);
             System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
             final Future<SimpleHttpResponse> future = client.execute(
                     httpget,
                     new FutureCallback<SimpleHttpResponse>() {
 
                         @Override
                         public void completed(final SimpleHttpResponse response) {
                             System.out.println(requestUri + "->" + response.getCode());
                             System.out.println(response.getBody());
                         }
 
                         @Override
                         public void failed(final Exception ex) {
                             System.out.println(requestUri + "->" + ex);
                         }
 
                         @Override
                         public void cancelled() {
                             System.out.println(requestUri + " cancelled");
                         }
 
                     });
             future.get();
         }
 
         System.out.println("Shutting down");
         client.close(CloseMode.GRACEFUL);
     }
 
 }