/*
    * ====================================================================
    * 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.core5.http.io.entity;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.hc.core5.http.ContentType;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit tests for {@link InputStreamEntity}.
   *
   */
  public class TestInputStreamEntity {
  
      @Test
      public void testBasics() throws Exception {
          final byte[] bytes = "Message content".getBytes(StandardCharsets.ISO_8859_1);
          final InputStreamEntity entity = new InputStreamEntity(new ByteArrayInputStream(bytes), bytes.length, null);
  
          Assertions.assertEquals(bytes.length, entity.getContentLength());
          Assertions.assertNotNull(entity.getContent());
          Assertions.assertFalse(entity.isRepeatable());
          Assertions.assertTrue(entity.isStreaming());
      }
  
      @Test
      public void testNullConstructor() throws Exception {
          Assertions.assertThrows(NullPointerException.class, () ->
                  new InputStreamEntity(null, 0, null));
      }
  
      @Test
      public void testUnknownLengthConstructor() throws Exception {
          final InputStreamEntity entity = new InputStreamEntity(EmptyInputStream.INSTANCE, null);
          Assertions.assertEquals(-1, entity.getContentLength());
      }
  
      @Test
      public void testWriteTo() throws Exception {
          final String message = "Message content";
          final byte[] bytes = message.getBytes(StandardCharsets.ISO_8859_1);
          final InputStream inStream = new ByteArrayInputStream(bytes);
          final InputStreamEntity entity = new InputStreamEntity(inStream, bytes.length,
                  ContentType.TEXT_PLAIN.withCharset(StandardCharsets.ISO_8859_1));
  
          final ByteArrayOutputStream out = new ByteArrayOutputStream();
          entity.writeTo(out);
          final byte[] writtenBytes = out.toByteArray();
          Assertions.assertNotNull(writtenBytes);
          Assertions.assertEquals(bytes.length, writtenBytes.length);
  
          final String s = new String(writtenBytes, StandardCharsets.ISO_8859_1.name());
          Assertions.assertEquals(message, s);
      }
  
      @Test
      public void testWriteToPartialContent() throws Exception {
          final String message = "Message content";
          final byte[] bytes = message.getBytes(StandardCharsets.ISO_8859_1);
          final InputStream inStream = new ByteArrayInputStream(bytes);
          final int contentLength = 7;
          final InputStreamEntity entity = new InputStreamEntity(inStream, contentLength,
                  ContentType.TEXT_PLAIN.withCharset(StandardCharsets.ISO_8859_1));
  
          final ByteArrayOutputStream out = new ByteArrayOutputStream();
          entity.writeTo(out);
          final byte[] writtenBytes = out.toByteArray();
          Assertions.assertNotNull(writtenBytes);
          Assertions.assertEquals(contentLength, writtenBytes.length);
 
         final String s = new String(writtenBytes, StandardCharsets.ISO_8859_1.name());
         Assertions.assertEquals(message.substring(0, contentLength), s);
     }
 
     @Test
     public void testWriteToUnknownLength() throws Exception {
         final String message = "Message content";
         final byte[] bytes = message.getBytes(StandardCharsets.ISO_8859_1);
         final InputStreamEntity entity = new InputStreamEntity(new ByteArrayInputStream(bytes),
                 ContentType.TEXT_PLAIN.withCharset(StandardCharsets.ISO_8859_1));
 
         final ByteArrayOutputStream out = new ByteArrayOutputStream();
         entity.writeTo(out);
         final byte[] writtenBytes = out.toByteArray();
         Assertions.assertNotNull(writtenBytes);
         Assertions.assertEquals(bytes.length, writtenBytes.length);
 
         final String s = new String(writtenBytes, StandardCharsets.ISO_8859_1.name());
         Assertions.assertEquals(message, s);
     }
 
     @Test
     public void testWriteToNull() throws Exception {
         final InputStreamEntity entity = new InputStreamEntity(EmptyInputStream.INSTANCE, 0, null);
         Assertions.assertThrows(NullPointerException.class, () ->
                 entity.writeTo(null));
     }
 }