/*
    * ====================================================================
    * 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.classic;
  
  import org.apache.hc.client5.http.classic.ExecRuntime;
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.http.impl.io.ChunkedInputStream;
  import org.apache.hc.core5.http.impl.io.SessionInputBufferImpl;
  import org.apache.hc.core5.http.io.SessionInputBuffer;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.ArgumentCaptor;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.MockitoAnnotations;
  
  import java.io.ByteArrayInputStream;
  import java.io.InputStream;
  import java.util.List;
  
  public class TestResponseEntityProxy {
  
      @Mock
      private ClassicHttpResponse response;
      @Mock
      private ExecRuntime execRuntime;
      @Mock
      private HttpEntity entity;
  
      @Before
      public void setUp() {
          MockitoAnnotations.initMocks(this);
          Mockito.when(entity.isStreaming()).thenReturn(Boolean.TRUE);
          Mockito.when(response.getEntity()).thenReturn(entity);
      }
  
      @Test
      public void testGetTrailersWithNoChunkedInputStream() throws Exception {
          final ByteArrayInputStream inputStream = new ByteArrayInputStream("Test payload".getBytes());
          Mockito.when(entity.getContent()).thenReturn(inputStream);
          final ArgumentCaptor<HttpEntity> httpEntityArgumentCaptor = ArgumentCaptor.forClass(HttpEntity.class);
  
          ResponseEntityProxy.enhance(response, execRuntime);
  
          Mockito.verify(response).setEntity(httpEntityArgumentCaptor.capture());
          final HttpEntity wrappedEntity = httpEntityArgumentCaptor.getValue();
  
          final InputStream is = wrappedEntity.getContent();
          while (is.read() != -1) {} // read until the end
          final Supplier<List<? extends Header>> trailers = wrappedEntity.getTrailers();
  
          Assert.assertTrue(trailers.get().isEmpty());
      }
  
      @Test
      public void testGetTrailersWithChunkedInputStream() throws Exception {
          final SessionInputBuffer sessionInputBuffer = new SessionInputBufferImpl(100);
          final ByteArrayInputStream inputStream = new ByteArrayInputStream("0\r\nX-Test-Trailer-Header: test\r\n".getBytes());
          final ChunkedInputStream chunkedInputStream = new ChunkedInputStream(sessionInputBuffer, inputStream);
  
          Mockito.when(entity.getContent()).thenReturn(chunkedInputStream);
          final ArgumentCaptor<HttpEntity> httpEntityArgumentCaptor = ArgumentCaptor.forClass(HttpEntity.class);
  
          ResponseEntityProxy.enhance(response, execRuntime);
  
          Mockito.verify(response).setEntity(httpEntityArgumentCaptor.capture());
          final HttpEntity wrappedEntity = httpEntityArgumentCaptor.getValue();
  
          final InputStream is = wrappedEntity.getContent();
          while (is.read() != -1) {} // consume the stream so it can reach to trailers and parse
         final Supplier<List<? extends Header>> trailers = wrappedEntity.getTrailers();
         final List<? extends Header> headers = trailers.get();
 
         Assert.assertEquals(1, headers.size());
         final Header header = headers.get(0);
         Assert.assertEquals("X-Test-Trailer-Header", header.getName());
         Assert.assertEquals("test", header.getValue());
     }
 }