/*
    * 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.rgbe;
  
  import java.awt.Dimension;
  import java.awt.Point;
  import java.awt.Transparency;
  import java.awt.color.ColorSpace;
  import java.awt.image.BandedSampleModel;
  import java.awt.image.BufferedImage;
  import java.awt.image.ComponentColorModel;
  import java.awt.image.DataBuffer;
  import java.awt.image.DataBufferFloat;
  import java.awt.image.Raster;
  import java.io.IOException;
  import java.util.ArrayList;
  
  import org.apache.commons.imaging.AbstractImageParser;
  import org.apache.commons.imaging.ImageFormat;
  import org.apache.commons.imaging.ImageFormats;
  import org.apache.commons.imaging.ImageInfo;
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.bytesource.ByteSource;
  import org.apache.commons.imaging.common.ImageMetadata;
  
  /**
   * Parser for Radiance HDR images
   */
  public class RgbeImageParser extends AbstractImageParser<RgbeImagingParameters> {
  
      /**
       * Constructs a new instance with the big-endian byte order.
       */
      public RgbeImageParser() {
          // empty
      }
  
      @Override
      protected String[] getAcceptedExtensions() {
          return ImageFormats.RGBE.getExtensions();
      }
  
      @Override
      protected ImageFormat[] getAcceptedTypes() {
          return new ImageFormat[] { ImageFormats.RGBE };
      }
  
      @Override
      public BufferedImage getBufferedImage(final ByteSource byteSource, final RgbeImagingParameters params) throws ImagingException, IOException {
          try (RgbeInfo info = new RgbeInfo(byteSource)) {
              // It is necessary to create our own BufferedImage here as the
              // org.apache.commons.imaging.common.IBufferedImageFactory interface does
              // not expose this complexity
              final DataBuffer buffer = new DataBufferFloat(info.getPixelData(), info.getWidth() * info.getHeight());
  
              return new BufferedImage(
                      new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB), false, false, Transparency.OPAQUE, buffer.getDataType()),
                      Raster.createWritableRaster(new BandedSampleModel(buffer.getDataType(), info.getWidth(), info.getHeight(), 3), buffer, new Point()), false,
                      null);
          }
      }
  
      @Override
      public String getDefaultExtension() {
          return ImageFormats.RGBE.getDefaultExtension();
      }
  
      @Override
      public RgbeImagingParameters getDefaultParameters() {
          return new RgbeImagingParameters();
      }
  
      @Override
      public byte[] getIccProfileBytes(final ByteSource byteSource, final RgbeImagingParameters params) throws ImagingException, IOException {
          return null;
      }
  
      @Override
      public ImageInfo getImageInfo(final ByteSource byteSource, final RgbeImagingParameters params) throws ImagingException, IOException {
          try (RgbeInfo info = new RgbeInfo(byteSource)) {
              return new ImageInfo(getName(), 32, // todo may be 64 if double?
                      new ArrayList<>(), ImageFormats.RGBE, getName(), info.getHeight(), "image/vnd.radiance", 1, -1, -1, -1, -1, info.getWidth(), false, false,
                      false, ImageInfo.ColorType.RGB, ImageInfo.CompressionAlgorithm.ADAPTIVE_RLE);
          }
      }
 
     @Override
     public Dimension getImageSize(final ByteSource byteSource, final RgbeImagingParameters params) throws ImagingException, IOException {
         try (RgbeInfo info = new RgbeInfo(byteSource)) {
             return new Dimension(info.getWidth(), info.getHeight());
         }
     }
 
     @Override
     public ImageMetadata getMetadata(final ByteSource byteSource, final RgbeImagingParameters params) throws ImagingException, IOException {
         try (RgbeInfo info = new RgbeInfo(byteSource)) {
             return info.getMetadata();
         }
     }
 
     @Override
     public String getName() {
         return "Radiance HDR";
     }
 }