/*
    * 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 java.nio.charset.StandardCharsets;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.BinaryFunctions;
  import org.apache.commons.imaging.formats.png.AbstractPngText;
  
  public final class PngChunkText extends AbstractPngTextChunk {
  
      private static final Logger LOGGER = Logger.getLogger(PngChunkText.class.getName());
  
      private final String keyword;
      private final String text;
  
      /**
       * Constructs a new instance.
       *
       * @param length    chunk length.
       * @param chunkType chunk type.
       * @param crc       CRC computed over the chunk type and chunk data (but not the length).
       * @param bytes     chunk data bytes.
       * @throws ImagingException Thrown on a parsing error.
       * @throws NullPointerException if {@code bytes} is null.
       */
      public PngChunkText(final int length, final int chunkType, final int crc, final byte[] bytes) throws ImagingException {
          super(length, chunkType, crc, bytes);
          final int index = BinaryFunctions.indexOf0(bytes, "PNG tEXt chunk keyword is not terminated.");
          keyword = new String(bytes, 0, index, StandardCharsets.ISO_8859_1);
          final int textLength = bytes.length - (index + 1);
          text = new String(bytes, index + 1, textLength, StandardCharsets.ISO_8859_1);
          if (LOGGER.isLoggable(Level.FINEST)) {
              LOGGER.finest("Keyword: " + keyword);
              LOGGER.finest("Text: " + text);
          }
      }
  
      @Override
      public AbstractPngText getContents() {
          return new AbstractPngText.Text(keyword, text);
      }
  
      /**
       * @return the keyword.
       */
      @Override
      public String getKeyword() {
          return keyword;
      }
  
      /**
       * @return the text.
       */
      @Override
      public String getText() {
          return text;
      }
  
  }