/*
    * 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;
  
  import java.util.Arrays;
  
  public enum PngColorType {
  
      // FIXME can this be merged with ImageInfo.ColorType?
  
      GREYSCALE(0, true, false, 1, new int[] { 1, 2, 4, 8, 16 }), TRUE_COLOR(2, false, false, 3, new int[] { 8, 16 }),
      INDEXED_COLOR(3, false, false, 1, new int[] { 1, 2, 4, 8 }), GREYSCALE_WITH_ALPHA(4, true, true, 2, new int[] { 8, 16 }),
      TRUE_COLOR_WITH_ALPHA(6, false, true, 4, new int[] { 8, 16 });
  
      static PngColorType getColorType(final boolean alpha, final boolean grayscale) {
          if (grayscale) {
              if (alpha) {
                  return PngColorType.GREYSCALE_WITH_ALPHA;
              }
              return PngColorType.GREYSCALE;
          }
          if (alpha) {
              return PngColorType.TRUE_COLOR_WITH_ALPHA;
          }
          return PngColorType.TRUE_COLOR;
      }
  
      public static PngColorType getColorType(final int value) {
          for (final PngColorType type : values()) {
              if (type.value == value) {
                  return type;
              }
          }
  
          return null;
      }
  
      private final int value;
      private final boolean greyscale;
      private final boolean alpha;
  
      private final int samplesPerPixel;
  
      private final int[] allowedBitDepths;
  
      PngColorType(final int value, final boolean greyscale, final boolean alpha, final int samplesPerPixel, final int[] allowedBitDepths) {
          this.value = value;
          this.greyscale = greyscale;
          this.alpha = alpha;
          this.samplesPerPixel = samplesPerPixel;
          this.allowedBitDepths = allowedBitDepths;
      }
  
      int getSamplesPerPixel() {
          return samplesPerPixel;
      }
  
      int getValue() {
          return value;
      }
  
      boolean hasAlpha() {
          return alpha;
      }
  
      boolean isBitDepthAllowed(final int bitDepth) {
          return Arrays.binarySearch(allowedBitDepths, bitDepth) >= 0;
      }
  
      boolean isGreyscale() {
          return greyscale;
      }
  }