// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkImageAccumulate.h"
#include "vtkImageData.h"
#include "vtkImageSinusoidSource.h"
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"

#include "vtkTestUtilities.h"

#include <cmath>

#include <iostream>

int ImageAccumulate(int, char*[])
{
  int rval = 0;

  // Create a blank image
  vtkImageSinusoidSource* sinus = vtkImageSinusoidSource::New();
  sinus->SetWholeExtent(0, 512 - 1, 0, 512 - 1, 0, 64 - 1);
  sinus->SetAmplitude(0);
  sinus->Update();

  // Set some value
  sinus->GetOutput()->SetScalarComponentFromDouble(0, 0, 0, 0, 1);
  sinus->GetOutput()->SetScalarComponentFromDouble(10, 10, 10, 0, 2);
  sinus->GetOutput()->SetScalarComponentFromDouble(10, 100, 20, 0, 3);
  sinus->GetOutput()->SetScalarComponentFromDouble(100, 10, 30, 0, 4);
  sinus->GetOutput()->SetScalarComponentFromDouble(100, 100, 40, 0, 5);

  vtkImageAccumulate* acc = vtkImageAccumulate::New();
  acc->SetInputConnection(sinus->GetOutputPort());
  // acc->IgnoreZeroOn();
  acc->Update();

  acc->Print(std::cout);
  double min[3], max[3];
  acc->GetMin(min);
  acc->GetMax(max);
  if (min[0] != 0)
  {
    std::cerr << "Min: " << min[0] << std::endl;
    rval++;
  }
  if (max[0] != 5)
  {
    std::cerr << "Max: " << max[0] << std::endl;
    rval++;
  }
  double mean[3];
  long int voxcount;
  voxcount = acc->GetVoxelCount();
  acc->GetMean(mean);
  double m = double(1 + 2 + 3 + 4 + 5) / voxcount;
  if (fabs(mean[0] - m) > 1e-10)
  {
    std::cerr << "Mean: " << mean[0] << std::endl;
    rval++;
  }

  // Test IgnoreZero option
  acc->IgnoreZeroOn();
  acc->Update();
  acc->Print(std::cout);

  // Simple test
  acc->GetMin(min);
  acc->GetMax(max);
  if (min[0] != 1)
  {
    std::cerr << "Min: " << min[0] << std::endl;
    rval++;
  }
  if (max[0] != 5)
  {
    std::cerr << "Max: " << max[0] << std::endl;
    rval++;
  }
  acc->GetMean(mean);
  if (mean[0] != double(1 + 2 + 3 + 4 + 5) / 5)
  {
    std::cerr << "Mean: " << mean[0] << std::endl;
    rval++;
  }

  sinus->Delete();
  acc->Delete();

  return rval;
}