/*
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    * 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.entity;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.zip.CRC32;
  import java.util.zip.CheckedInputStream;
  import java.util.zip.Checksum;
  
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.io.entity.InputStreamEntity;
  import org.apache.hc.core5.http.io.entity.StringEntity;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class TestDecompressingEntity {
  
      @Test
      public void testNonStreaming() throws Exception {
          final CRC32 crc32 = new CRC32();
          final StringEntity wrapped = new StringEntity("1234567890", StandardCharsets.US_ASCII);
          final ChecksumEntity entity = new ChecksumEntity(wrapped, crc32);
          Assert.assertFalse(entity.isStreaming());
          final String s = EntityUtils.toString(entity);
          Assert.assertEquals("1234567890", s);
          Assert.assertEquals(639479525L, crc32.getValue());
          final InputStream in1 = entity.getContent();
          final InputStream in2 = entity.getContent();
          Assert.assertTrue(in1 != in2);
      }
  
      @Test
      public void testStreaming() throws Exception {
          final CRC32 crc32 = new CRC32();
          final ByteArrayInputStream in = new ByteArrayInputStream("1234567890".getBytes(StandardCharsets.US_ASCII));
          final InputStreamEntity wrapped = new InputStreamEntity(in, -1, ContentType.DEFAULT_TEXT);
          final ChecksumEntity entity = new ChecksumEntity(wrapped, crc32);
          Assert.assertTrue(entity.isStreaming());
          final String s = EntityUtils.toString(entity);
          Assert.assertEquals("1234567890", s);
          Assert.assertEquals(639479525L, crc32.getValue());
          final InputStream in1 = entity.getContent();
          final InputStream in2 = entity.getContent();
          Assert.assertTrue(in1 == in2);
          EntityUtils.consume(entity);
          EntityUtils.consume(entity);
      }
  
      @Test
      public void testWriteToStream() throws Exception {
          final CRC32 crc32 = new CRC32();
          final StringEntity wrapped = new StringEntity("1234567890", StandardCharsets.US_ASCII);
          final ChecksumEntity entity = new ChecksumEntity(wrapped, crc32);
          Assert.assertFalse(entity.isStreaming());
  
          final ByteArrayOutputStream out = new ByteArrayOutputStream();
          entity.writeTo(out);
  
          final String s = new String(out.toByteArray(), StandardCharsets.US_ASCII);
          Assert.assertEquals("1234567890", s);
          Assert.assertEquals(639479525L, crc32.getValue());
      }
  
      static class ChecksumEntity extends DecompressingEntity {
  
          public ChecksumEntity(final HttpEntity wrapped, final Checksum checksum) {
              super(wrapped, new InputStreamFactory() {
  
                 @Override
                 public InputStream create(final InputStream inStream) throws IOException {
                     return new CheckedInputStream(inStream, checksum);
                 }
 
             });
         }
 
     }
 
 }