/*
    * 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.
   */
  package org.apache.commons.imaging.formats.png.chunks;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.IntStream;
  import java.util.zip.Deflater;
  import java.util.zip.DeflaterOutputStream;
  
  import org.apache.commons.imaging.ImagingConstants;
  import org.apache.commons.imaging.ImagingException;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests for {@link PngChunkIccp}.
   */
  public class PngChunkIccpTest {
  
      private static final int chunkType = 1766015824;
  
      @Test
      public void testErrorOnNoProfileName() {
          final byte[] data = ImagingConstants.EMPTY_BYTE_ARRAY;
          assertThrows(ImagingException.class, () -> new PngChunkIccp(0, chunkType, 0, data));
      }
  
      @Test
      public void testParsingIccpChunk() throws ImagingException, IOException {
          final List<Byte> bytes = new ArrayList<>();
          final String profileName = "my-profile-01";
          for (final byte b : profileName.getBytes(StandardCharsets.ISO_8859_1)) {
              bytes.add(b);
          }
          bytes.add((byte) 0); // null
          bytes.add((byte) 0); // 0=deflate compression method
  
          // generate some 100 bytes of dummy data
          final byte[] uncompressedData = new byte[100];
          IntStream.range(0, 100).forEach(i -> {
              uncompressedData[i] = (byte) (i + 1); // dummy data
          });
          try (ByteArrayOutputStream baos = new ByteArrayOutputStream(100)) {
              // compress the dummy data with deflate
              final Deflater def = new Deflater();
              try (DeflaterOutputStream ios = new DeflaterOutputStream(baos, def)) {
                  ios.write(uncompressedData);
              }
              baos.flush();
              final byte[] compressedData = baos.toByteArray();
              final byte[] data = new byte[bytes.size() + compressedData.length];
              // gather everything, except for the compressed data
              for (int i = 0; i < bytes.size(); ++i) {
                  data[i] = bytes.get(i).byteValue();
              }
              // gather the compressed data
              IntStream.range(0, compressedData.length).forEach(i -> data[bytes.size() + i] = compressedData[i]);
              // create the chunk
              final PngChunkIccp chunk = new PngChunkIccp(data.length, chunkType, 0, data);
              assertArrayEquals(uncompressedData, chunk.getUncompressedProfile());
          }
      }
  }