/*
    * 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.apache.commons.imaging.common.BinaryFunctions.readByte;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.util.Arrays;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.Allocator;
  import org.apache.commons.imaging.formats.png.GammaCorrection;
  
  public class PngChunkPlte extends PngChunk {
      private final int[] rgb;
  
      public PngChunkPlte(final int length, final int chunkType, final int crc, final byte[] bytes) throws ImagingException, IOException {
          super(length, chunkType, crc, bytes);
  
          final ByteArrayInputStream is = new ByteArrayInputStream(bytes);
  
          if (length % 3 != 0) {
              throw new ImagingException("PLTE: wrong length: " + length);
          }
  
          final int count = length / 3;
  
          rgb = Allocator.intArray(count);
  
          for (int i = 0; i < count; i++) {
              final int red = readByte("red[" + i + "]", is, "Not a Valid PNG File: PLTE Corrupt");
              final int green = readByte("green[" + i + "]", is, "Not a Valid PNG File: PLTE Corrupt");
              final int blue = readByte("blue[" + i + "]", is, "Not a Valid PNG File: PLTE Corrupt");
              rgb[i] = 0xff000000 | (0xff & red) << 16 | (0xff & green) << 8 | (0xff & blue) << 0;
          }
      }
  
      public void correct(final GammaCorrection gammaCorrection) {
          Arrays.setAll(rgb, i -> gammaCorrection.correctArgb(rgb[i]));
      }
  
      public int[] getRgb() {
          return rgb.clone();
      }
  
      // public void printPalette() {
      // Debug.debug();
      // Debug.debug("palette");
      // for (int i = 0; i < rgb.length; i++) {
      // Debug.debug("\t" + "palette[" + i + "];", rgb[i] + " (0x"
      // + Integer.toHexString(rgb[i]) + ")");
      //
      // }
      // Debug.debug();
      // }
  
      public int getRgb(final int index) throws ImagingException {
          if (index < 0 || index >= rgb.length) {
              throw new ImagingException("PNG: unknown Palette reference: " + index);
          }
          return rgb[index];
      }
  
  }