/*=========================================================================

  Library:   CTK

  Copyright (c) Kitware Inc.

  Licensed 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.txt

  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.

=========================================================================*/

// CTK includes
#include "ctkWidgetsTestingUtilities.h"

// Qt includes
#include <QColor>
#include <QImage>

// STD includes
#include <iostream>

using namespace ctkWidgetsTestingUtilities;

//----------------------------------------------------------------------------
bool TestCheckCompareImages();

//----------------------------------------------------------------------------
int ctkWidgetsTestingUtilitiesTest(int , char * [])
{
  bool res = true;
  res = res && TestCheckCompareImages();
  return res ? EXIT_SUCCESS : EXIT_FAILURE;
}

//----------------------------------------------------------------------------
bool TestCheckCompareImages()
{
  {
    // Invalid format
    QImage a(1, 1, QImage::Format_Invalid);
    QImage b(1, 1, QImage::Format_Invalid);
    if (CompareImages(a, b))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }
  }

  {
    // Unsupported format
    QImage a(1, 1, QImage::Format_ARGB32);
    QImage b(1, 1, QImage::Format_ARGB32);
    if (CompareImages(a, b))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }
  }

  {
    // One image in unsupported format
    QImage a(1, 1, QImage::Format_RGB32);
    QImage b(1, 1, QImage::Format_ARGB32);
    if (CompareImages(a, b))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    QImage c(1, 1, QImage::Format_ARGB32);
    QImage d(1, 1, QImage::Format_RGB32);
    if (CompareImages(c, d))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }
  }

  {
    // Images of different size
    QImage a(1, 1, QImage::Format_RGB32);
    QImage b(2, 1, QImage::Format_RGB32);
    if (CompareImages(a, b))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    QImage c(1, 2, QImage::Format_ARGB32);
    QImage d(1, 1, QImage::Format_RGB32);
    if (CompareImages(c, d))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }
  }

  {
    // Identical images
    QImage a(10, 10, QImage::Format_RGB32);
    a.fill(Qt::green);
    QImage b(10, 10, QImage::Format_RGB32);
    b.fill(Qt::green);
    if (!CompareImages(a, b, 0.0f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Change one pixel in first image
    a.setPixel(2, 3, qRgb(255, 0, 0));
    if (CompareImages(a, b, 0.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Compare with percent threshold not met
    if (CompareImages(a, b, 0.5f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Compare with percent threshold met
    if (!CompareImages(a, b, 1.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Change one pixel in other image
    // Compare with percent threshold not met
    b.setPixel(4, 5, qRgb(255, 255, 0));
    if (CompareImages(a, b, 1.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Compare with percent threshold met
    if (!CompareImages(a, b, 2.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Change one pixel in first image to match second image
    a.setPixel(4, 5, qRgb(255, 255, 0));
    if (!CompareImages(a, b, 1.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }

    // Identical images
    b.setPixel(2, 3, qRgb(255, 0, 0));
    if (!CompareImages(a, b, 0.f))
      {
      std::cerr << "Line " << __LINE__ << " - CompareImages failed" << std::endl;
      return false;
      }
  }

  return true;
}