/*
    * 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.pnm;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.imaging.ImageFormat;
  import org.apache.commons.imaging.ImageFormats;
  import org.apache.commons.imaging.ImageInfo;
  import org.apache.commons.imaging.ImagingException;
  
  final class PpmFileInfo extends AbstractFileInfo {
      private final int max;
      private final float scale;
      private final int bytesPerSample;
  
      PpmFileInfo(final int width, final int height, final boolean rawBits, final int max) throws ImagingException {
          super(width, height, rawBits);
          if (max <= 0) {
              throw new ImagingException("PPM maxVal " + max + " is out of range [1;65535]");
          }
          if (max <= 255) {
              scale = 255f;
              bytesPerSample = 1;
          } else if (max <= 65535) {
              scale = 65535f;
              bytesPerSample = 2;
          } else {
              throw new ImagingException("PPM maxVal " + max + " is out of range [1;65535]");
          }
          this.max = max;
      }
  
      @Override
      public int getBitDepth() {
          return max;
      }
  
      @Override
      public ImageInfo.ColorType getColorType() {
          return ImageInfo.ColorType.RGB;
      }
  
      @Override
      public ImageFormat getImageType() {
          return ImageFormats.PPM;
      }
  
      @Override
      public String getImageTypeDescription() {
          return "PPM: portable pixmap file format";
      }
  
      @Override
      public String getMimeType() {
          return "image/x-portable-pixmap";
      }
  
      @Override
      public int getNumComponents() {
          return 3;
      }
  
      @Override
      public int getRgb(final InputStream is) throws IOException {
          int red = readSample(is, bytesPerSample);
          int green = readSample(is, bytesPerSample);
          int blue = readSample(is, bytesPerSample);
  
          red = scaleSample(red, scale, max);
          green = scaleSample(green, scale, max);
          blue = scaleSample(blue, scale, max);
          final int alpha = 0xff;
  
          return (0xff & alpha) << 24 | (0xff & red) << 16 | (0xff & green) << 8 | (0xff & blue) << 0;
      }
  
      @Override
      public int getRgb(final WhiteSpaceReader wsr) throws IOException {
          int red = Integer.parseInt(wsr.readtoWhiteSpace());
          int green = Integer.parseInt(wsr.readtoWhiteSpace());
          int blue = Integer.parseInt(wsr.readtoWhiteSpace());
  
          red = scaleSample(red, scale, max);
         green = scaleSample(green, scale, max);
         blue = scaleSample(blue, scale, max);
         final int alpha = 0xff;
 
         return (0xff & alpha) << 24 | (0xff & red) << 16 | (0xff & green) << 8 | (0xff & blue) << 0;
     }
 
     @Override
     public boolean hasAlpha() {
         return false;
     }
 }