/*
    * 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.psd.datareaders;
  
  import java.awt.image.BufferedImage;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.ByteOrder;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.Allocator;
  import org.apache.commons.imaging.common.BinaryFileParser;
  import org.apache.commons.imaging.common.BinaryFunctions;
  import org.apache.commons.imaging.common.PackBits;
  import org.apache.commons.imaging.formats.psd.PsdHeaderInfo;
  import org.apache.commons.imaging.formats.psd.PsdImageContents;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParser;
  import org.apache.commons.imaging.mylzw.BitsToByteInputStream;
  import org.apache.commons.imaging.mylzw.MyBitInputStream;
  
  public class CompressedDataReader implements DataReader {
  
      private final DataParser dataParser;
  
      public CompressedDataReader(final DataParser dataParser) {
          this.dataParser = dataParser;
      }
  
      @Override
      public void readData(final InputStream is, final BufferedImage bi, final PsdImageContents imageContents, final BinaryFileParser bfp)
              throws ImagingException, IOException {
          final PsdHeaderInfo header = imageContents.header;
          final int width = header.columns;
          final int height = header.rows;
  
          // this.setDebug(true);
          final int scanlineCount = height * header.channels;
          final int[] scanlineByteCounts = Allocator.intArray(scanlineCount);
          for (int i = 0; i < scanlineCount; i++) {
              scanlineByteCounts[i] = BinaryFunctions.read2Bytes("scanlineByteCounts[" + i + "]", is, "PSD: bad Image Data", bfp.getByteOrder());
          }
          // System.out.println("fImageContents.Compression: "
          // + imageContents.Compression);
  
          final int depth = header.depth;
  
          final int channelCount = dataParser.getBasicChannelsCount();
          final int[][][] data = new int[Allocator.check(channelCount)][Allocator.check(height)][];
          // channels[0] =
          for (int channel = 0; channel < channelCount; channel++) {
              for (int y = 0; y < height; y++) {
                  final int index = channel * height + y;
                  final byte[] packed = BinaryFunctions.readBytes("scanline", is, scanlineByteCounts[index], "PSD: Missing Image Data");
  
                  final byte[] unpacked = PackBits.decompress(packed, width);
                  try (InputStream bais = new ByteArrayInputStream(unpacked);
                          MyBitInputStream mbis = new MyBitInputStream(bais, ByteOrder.BIG_ENDIAN, false)) {
                      // we want all samples to be bytes
                      try (BitsToByteInputStream bbis = new BitsToByteInputStream(mbis, 8)) {
                          final int[] scanline = bbis.readBitsArray(depth, width);
                          data[channel][y] = scanline;
                      }
                  }
              }
          }
          dataParser.parseData(data, bi, imageContents);
      }
  
  }