/*
    * 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 static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.awt.image.BufferedImage;
  import java.awt.image.DataBufferInt;
  import java.io.IOException;
  import java.nio.charset.Charset;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.commons.imaging.ImageFormats;
  import org.apache.commons.imaging.ImageInfo;
  import org.apache.commons.imaging.Imaging;
  import org.apache.commons.imaging.ImagingException;
  import org.junit.jupiter.api.Test;
  
  public class PnmImageParserTest {
  
      private static final Charset US_ASCII = StandardCharsets.US_ASCII;
  
      @Test
      public void testGetImageInfo_happyCase() throws ImagingException, IOException {
          final byte[] bytes = "P1\n3 2\n0 1 0\n1 0 1\n".getBytes(US_ASCII);
          final PnmImagingParameters params = new PnmImagingParameters();
          final PnmImageParser underTest = new PnmImageParser();
          final ImageInfo results = underTest.getImageInfo(bytes, params);
          assertEquals(results.getBitsPerPixel(), 1);
          assertEquals(results.getWidth(), 3);
          assertEquals(results.getHeight(), 2);
          assertEquals(results.getNumberOfImages(), 1);
      }
  
      @Test
      public void testGetImageInfo_invalidHeight() {
          final byte[] bytes = "P1\n2 a\n0 0\n0 0\n0 0\n0 0\n0 0\n0 1\n1 1\n1 1\n1 1\n1 1\n1 1\n".getBytes(US_ASCII);
          final PnmImagingParameters params = new PnmImagingParameters();
          final PnmImageParser underTest = new PnmImageParser();
          assertThrows(ImagingException.class, () -> underTest.getImageInfo(bytes, params));
      }
  
      /**
       * If an invalid width is specified, should throw {@link ImagingException} rather than {@link NumberFormatException}.
       */
      @Test
      public void testGetImageInfo_invalidWidth() {
          final byte[] bytes = "P1\na 2\n0 0 0 0 0 0 0 0 0 0 0\n1 1 1 1 1 1 1 1 1 1 1\n".getBytes(US_ASCII);
          final PnmImagingParameters params = new PnmImagingParameters();
          final PnmImageParser underTest = new PnmImageParser();
          assertThrows(ImagingException.class, () -> underTest.getImageInfo(bytes, params));
      }
  
      @Test
      public void testGetImageInfo_missingWidthValue() {
          final byte[] bytes = "P7\nWIDTH \n".getBytes(US_ASCII);
          final PnmImagingParameters params = new PnmImagingParameters();
          final PnmImageParser underTest = new PnmImageParser();
          assertThrows(ImagingException.class, () -> underTest.getImageInfo(bytes, params));
      }
  
      @Test
      public void testWriteImageRaw_happyCase() throws ImagingException, ImagingException, IOException {
          final BufferedImage srcImage = new BufferedImage(10, 10, BufferedImage.TYPE_INT_ARGB);
  
          final byte[] dstBytes = Imaging.writeImageToBytes(srcImage, ImageFormats.PNM);
          final BufferedImage dstImage = Imaging.getBufferedImage(dstBytes);
  
          assertEquals(srcImage.getWidth(), dstImage.getWidth());
          assertEquals(srcImage.getHeight(), dstImage.getHeight());
  
          final DataBufferInt srcData = (DataBufferInt) srcImage.getRaster().getDataBuffer();
          final DataBufferInt dstData = (DataBufferInt) dstImage.getRaster().getDataBuffer();
  
          for (int bank = 0; bank < srcData.getNumBanks(); bank++) {
              final int[] actual = srcData.getData(bank);
              final int[] expected = dstData.getData(bank);
  
              assertArrayEquals(actual, expected);
          }
      }
  }