/*
    * 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.jpeg.segments;
  
  import static org.apache.commons.imaging.common.BinaryFunctions.read2Bytes;
  import static org.apache.commons.imaging.common.BinaryFunctions.readByte;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.Allocator;
  import org.apache.commons.imaging.formats.jpeg.JpegConstants;
  
  public final class SofnSegment extends AbstractSegment {
  
      public static class Component {
          static final int SHALLOW_SIZE = 32;
          public final int componentIdentifier;
          public final int horizontalSamplingFactor;
          public final int verticalSamplingFactor;
          public final int quantTabDestSelector;
  
          public Component(final int componentIdentifier, final int horizontalSamplingFactor, final int veritcalSamplingFactor, final int quantTabDestSelector) {
              this.componentIdentifier = componentIdentifier;
              this.horizontalSamplingFactor = horizontalSamplingFactor;
              this.verticalSamplingFactor = veritcalSamplingFactor;
              this.quantTabDestSelector = quantTabDestSelector;
          }
      }
  
      private static final Logger LOGGER = Logger.getLogger(SofnSegment.class.getName());
      public final int width;
      public final int height;
      public final int numberOfComponents;
      public final int precision;
  
      private final Component[] components;
  
      public SofnSegment(final int marker, final byte[] segmentData) throws IOException, ImagingException {
          this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
      }
  
      public SofnSegment(final int marker, final int markerLength, final InputStream is) throws IOException, ImagingException {
          super(marker, markerLength);
  
          if (LOGGER.isLoggable(Level.FINEST)) {
              LOGGER.finest("SOF0Segment markerLength: " + markerLength);
          }
  
          precision = readByte("precision", is, "Not a Valid JPEG File");
          height = read2Bytes("height", is, "Not a Valid JPEG File", getByteOrder());
          width = read2Bytes("width", is, "Not a Valid JPEG File", getByteOrder());
          numberOfComponents = readByte("numberOfComponents", is, "Not a Valid JPEG File");
          if (numberOfComponents < 0) {
              throw new ImagingException("The number of components in a SOF0Segment cannot be less than 0!");
          }
          components = Allocator.array(numberOfComponents, Component[]::new, Component.SHALLOW_SIZE);
          for (int i = 0; i < numberOfComponents; i++) {
              final int componentIdentifier = readByte("ComponentIdentifier", is, "Not a Valid JPEG File");
  
              final int hvSamplingFactors = readByte("SamplingFactors", is, "Not a Valid JPEG File");
              final int horizontalSamplingFactor = hvSamplingFactors >> 4 & 0xf;
              final int verticalSamplingFactor = hvSamplingFactors & 0xf;
              final int quantTabDestSelector = readByte("QuantTabDestSel", is, "Not a Valid JPEG File");
              components[i] = new Component(componentIdentifier, horizontalSamplingFactor, verticalSamplingFactor, quantTabDestSelector);
          }
      }
  
      /**
       * Returns a copy of all the components.
       *
       * @return the components
       */
      public Component[] getComponents() {
          return components.clone();
      }
  
      /**
       * Returns the component at the specified index.
       *
       * @param index the array index
      * @return the component
      */
     public Component getComponents(final int index) {
         return components[index];
     }
 
     @Override
     public String getDescription() {
         return "SOFN (SOF" + (marker - JpegConstants.SOF0_MARKER) + ") (" + getSegmentType() + ")";
     }
 
 }