/*
    * ====================================================================
    * 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.protocol;
  
  import java.nio.charset.StandardCharsets;
  
  import org.apache.hc.client5.http.config.RequestConfig;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HeaderElements;
  import org.apache.hc.core5.http.HttpHeaders;
  import org.apache.hc.core5.http.HttpVersion;
  import org.apache.hc.core5.http.io.entity.StringEntity;
  import org.apache.hc.core5.http.message.BasicClassicHttpRequest;
  import org.apache.hc.core5.http.protocol.BasicHttpContext;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class TestRequestExpectContinue {
  
      @Test
      public void testRequestExpectContinueGenerated() throws Exception {
          final HttpClientContext context = HttpClientContext.create();
          final RequestConfig config = RequestConfig.custom().setExpectContinueEnabled(true).build();
          context.setAttribute(HttpClientContext.REQUEST_CONFIG, config);
          final ClassicHttpRequest request = new BasicClassicHttpRequest("POST", "/");
          final String s = "whatever";
          final StringEntity entity = new StringEntity(s, StandardCharsets.US_ASCII);
          request.setEntity(entity);
          final RequestExpectContinue interceptor = new RequestExpectContinue();
          interceptor.process(request, request.getEntity(), context);
          final Header header = request.getFirstHeader(HttpHeaders.EXPECT);
          Assert.assertNotNull(header);
          Assert.assertEquals(HeaderElements.CONTINUE, header.getValue());
      }
  
      @Test
      public void testRequestExpectContinueNotGenerated() throws Exception {
          final HttpContext context = new BasicHttpContext(null);
          final RequestConfig config = RequestConfig.custom().setExpectContinueEnabled(false).build();
          context.setAttribute(HttpClientContext.REQUEST_CONFIG, config);
          final ClassicHttpRequest request = new BasicClassicHttpRequest("POST", "/");
          final String s = "whatever";
          final StringEntity entity = new StringEntity(s, StandardCharsets.US_ASCII);
          request.setEntity(entity);
          final RequestExpectContinue interceptor = new RequestExpectContinue();
          interceptor.process(request, null, context);
          final Header header = request.getFirstHeader(HeaderElements.CONTINUE);
          Assert.assertNull(header);
      }
  
      @Test
      public void testRequestExpectContinueHTTP10() throws Exception {
          final HttpContext context = new BasicHttpContext(null);
          final RequestConfig config = RequestConfig.custom().setExpectContinueEnabled(true).build();
          context.setAttribute(HttpClientContext.REQUEST_CONFIG, config);
          final ClassicHttpRequest request = new BasicClassicHttpRequest("POST", "/");
          request.setVersion(HttpVersion.HTTP_1_0);
          final String s = "whatever";
          final StringEntity entity = new StringEntity(s, StandardCharsets.US_ASCII);
          request.setEntity(entity);
          final RequestExpectContinue interceptor = new RequestExpectContinue();
          interceptor.process(request, null, context);
          final Header header = request.getFirstHeader(HeaderElements.CONTINUE);
          Assert.assertNull(header);
      }
  
      @Test
      public void testRequestExpectContinueZeroContent() throws Exception {
          final HttpContext context = new BasicHttpContext(null);
          final RequestConfig config = RequestConfig.custom().setExpectContinueEnabled(true).build();
          context.setAttribute(HttpClientContext.REQUEST_CONFIG, config);
          final ClassicHttpRequest request = new BasicClassicHttpRequest("POST", "/");
         final String s = "";
         final StringEntity entity = new StringEntity(s, StandardCharsets.US_ASCII);
         request.setEntity(entity);
         final RequestExpectContinue interceptor = new RequestExpectContinue();
         interceptor.process(request, null, context);
         final Header header = request.getFirstHeader(HeaderElements.CONTINUE);
         Assert.assertNull(header);
     }
 
     @Test
     public void testRequestExpectContinueInvalidInput() throws Exception {
         final RequestExpectContinue interceptor = new RequestExpectContinue();
         try {
             interceptor.process(null, null, null);
             Assert.fail("NullPointerException should have been thrown");
         } catch (final NullPointerException ex) {
             // expected
         }
     }
 
     @Test
     public void testRequestExpectContinueIgnoreNonenclosingRequests() throws Exception {
         final HttpContext context = new BasicHttpContext(null);
         final ClassicHttpRequest request = new BasicClassicHttpRequest("POST", "/");
         final RequestExpectContinue interceptor = new RequestExpectContinue();
         interceptor.process(request, null, context);
         Assert.assertEquals(0, request.getHeaders().length);
     }
 
 }