/*
    * 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;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.awt.Color;
  import java.awt.Graphics2D;
  import java.awt.image.BufferedImage;
  import java.io.File;
  import java.io.IOException;
  
  import org.apache.commons.imaging.Imaging;
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.ImagingTestConstants;
  import org.junit.jupiter.api.Test;
  
  /**
   * Performs tests that access the content of TIFF files containing non-opaque alpha-channel pixels
   */
  public class TiffReadAlphaTest {
  
      private final static String[] names = { "TransparencyTestStripAssociated.tif", "TransparencyTestStripUnassociated.tif",
              "TransparencyTestTileAssociated.tif", "TransparencyTestTileUnassociated.tif" };
  
      private final static int[][] testSite = { { 40, 40, 0xffff0000 }, { 60, 40, 0xff77ff77 }, { 40, 60, 0xffff0000 }, { 60, 60, 0xff008800 } };
  
      /**
       * Gets a file from the TIFF test directory that contains floating-point data.
       *
       * @param name a valid file name
       * @return a valid file reference.
       */
      private File getTiffFile(final String name) {
          final File tiffFolder = new File(ImagingTestConstants.TEST_IMAGE_FOLDER, "tiff");
          final File alphaFolder = new File(tiffFolder, "12");
          return new File(alphaFolder, name);
      }
  
      @Test
      public void test() throws ImagingException, IOException {
          for (final String name : names) {
              final File subject = getTiffFile(name);
              final BufferedImage overlay = Imaging.getBufferedImage(subject);
              final BufferedImage composite = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
              final Graphics2D g2d = composite.createGraphics();
              g2d.setColor(Color.white);
              g2d.fillRect(0, 0, 101, 101);
              g2d.setColor(Color.black);
              g2d.fillRect(0, 50, 101, 51);
              g2d.drawImage(overlay, 0, 0, null);
  
              for (final int[] element : testSite) {
                  final int x = element[0];
                  final int y = element[1];
                  final int p = element[2];
                  final int t = composite.getRGB(x, y);
                  assertEquals(t, p, "Error for " + name + " at position " + x + ", " + y);
              }
          }
      }
  }