/*
    * ====================================================================
    * 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.util.concurrent.atomic.AtomicLong;
  
  import org.apache.hc.client5.http.classic.ExecChain;
  import org.apache.hc.client5.http.classic.ExecChainHandler;
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.impl.ChainElement;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  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.HttpStatus;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.io.entity.StringEntity;
  import org.apache.hc.core5.http.message.BasicClassicHttpResponse;
  import org.apache.hc.core5.http.protocol.HttpContext;
  
  /**
   * This example demonstrates how to insert custom request interceptor and an execution interceptor
   * to the request execution chain.
   */
  public class ClientInterceptors {
  
      public static void main(final String[] args) throws Exception {
          try (final CloseableHttpClient httpclient = HttpClients.custom()
  
                  // 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 ExecChainHandler() {
  
                      @Override
                      public ClassicHttpResponse execute(
                              final ClassicHttpRequest request,
                              final ExecChain.Scope scope,
                              final ExecChain chain) throws IOException, HttpException {
  
                          final Header idHeader = request.getFirstHeader("request-id");
                          if (idHeader != null && "13".equalsIgnoreCase(idHeader.getValue())) {
                              final ClassicHttpResponse response = new BasicClassicHttpResponse(HttpStatus.SC_NOT_FOUND, "Oppsie");
                              response.setEntity(new StringEntity("bad luck", ContentType.TEXT_PLAIN));
                              return response;
                          } else {
                              return chain.proceed(request, scope);
                          }
                      }
  
                  })
                  .build()) {
 
             for (int i = 0; i < 20; i++) {
                 final HttpGet httpget = new HttpGet("http://httpbin.org/get");
 
                 System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
 
                 try (final CloseableHttpResponse response = httpclient.execute(httpget)) {
                     System.out.println("----------------------------------------");
                     System.out.println(response.getCode() + " " + response.getReasonPhrase());
                     System.out.println(EntityUtils.toString(response.getEntity()));
                 }
             }
         }
     }
 
 }