/*
    * 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.tiff.photometricinterpreters;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.ImageBuilder;
  import org.apache.commons.imaging.formats.tiff.photometricinterpreters.PhotometricInterpreterLogLuv.TristimulusValues;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  public class PhotometricInterpreterLogLuvTest {
  
      private PhotometricInterpreterLogLuv p;
  
      private final int samplesPerPixel = 8;
      private final int[] bitsPerSample = { 1, 2, 3 };
      private final int predictor = 1;
      private final int width = 800;
      private final int height = 600;
  
      @BeforeEach
      public void setUp() {
          p = new PhotometricInterpreterLogLuv(samplesPerPixel, bitsPerSample, predictor, width, height);
      }
  
      @Test
      public void testConstructor() {
          assertEquals(samplesPerPixel, p.samplesPerPixel);
          for (int i = 0; i < bitsPerSample.length; i++) {
              assertEquals(bitsPerSample[i], p.getBitsPerSample(i));
          }
          assertEquals(predictor, p.predictor);
          assertEquals(width, p.width);
          assertEquals(height, p.height);
      }
  
      @Test
      public void testGetRgbValues() {
          // any value equals 0 will have its pow(N, 3) equal to 0
          final TristimulusValues triValues = new TristimulusValues();
          triValues.x = 0;
          triValues.y = 0;
          triValues.z = 0;
          assertEquals(0, p.getRgbValues(triValues).r);
          assertEquals(0, p.getRgbValues(triValues).g);
          assertEquals(0, p.getRgbValues(triValues).b);
          triValues.x = 1;
          triValues.y = 1;
          triValues.z = 1;
          assertEquals(28, p.getRgbValues(triValues).r);
          assertEquals(24, p.getRgbValues(triValues).g);
          assertEquals(23, p.getRgbValues(triValues).b);
      }
  
      @Test
      public void testGetTristimulusValues() {
          // any value equals 0 will have its pow(N, 3) equal to 0
          assertEquals(0.0d, p.getTristimulusValues(0, 0, 0).x, 0.001d);
          assertEquals(0.0d, p.getTristimulusValues(0, 0, 0).y, 0.001d);
          assertEquals(0.0d, p.getTristimulusValues(0, 0, 0).z, 0.001d);
          // values under the threshold used in the if statements
          assertEquals(0.04126d, p.getTristimulusValues(1, 0, 0).x, 0.001d);
          assertEquals(0.04341d, p.getTristimulusValues(1, 0, 0).y, 0.001d);
          assertEquals(0.04727d, p.getTristimulusValues(1, 0, 0).z, 0.001d);
          // values under the threshold used in the if statements
          assertEquals(29.36116d, p.getTristimulusValues(100, 100, 50).x, 0.001d);
          assertEquals(10.78483d, p.getTristimulusValues(100, 100, 50).y, 0.001d);
          assertEquals(1.25681d, p.getTristimulusValues(100, 100, 50).z, 0.001d);
      }
  
      @Test
      public void testInterpretPixel() throws ImagingException, IOException {
          final ImageBuilder imgBuilder = new ImageBuilder(600, 400, /* alpha */ true);
          final int x = 10;
          final int y = 20;
          p.interpretPixel(imgBuilder, new int[] { 100, (byte) 32, (byte) 2 }, x, y);
          assertEquals(-7584166, imgBuilder.getRgb(x, y));
      }
  
      @Test
     public void testInterpretPixelEmptySamples() {
         assertThrows(ImagingException.class, () -> p.interpretPixel(null, new int[] {}, 0, 0));
     }
 
     @Test
     public void testInterpretPixelNullSamples() {
         assertThrows(ImagingException.class, () -> p.interpretPixel(null, null, 0, 0));
     }
 }