// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// This test verifies that we can hot swap ANARI Volume rendering and
// GL volume rendering for float volume data.

#include <vtkCamera.h>
#include <vtkColorTransferFunction.h>
#include <vtkDataSet.h>
#include <vtkImageData.h>
#include <vtkImageResize.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkLogger.h>
#include <vtkNew.h>
#include <vtkNrrdReader.h>
#include <vtkOpenGLGPUVolumeRayCastMapper.h>
#include <vtkPiecewiseFunction.h>
#include <vtkRegressionTestImage.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTestUtilities.h>
#include <vtkVolume16Reader.h>
#include <vtkVolumeProperty.h>

#include "vtkAnariPass.h"
#include "vtkAnariRendererNode.h"
#include "vtkAnariTestUtilities.h"
#include "vtkAnariVolumeMapper.h"

int TestAnariVolumeRenderer(int argc, char* argv[])
{
  vtkLogger::SetStderrVerbosity(vtkLogger::Verbosity::VERBOSITY_WARNING);
  bool useDebugDevice = false;

  for (int i = 0; i < argc; i++)
  {
    if (!strcmp(argv[i], "-trace"))
    {
      useDebugDevice = true;
      vtkLogger::SetStderrVerbosity(vtkLogger::Verbosity::VERBOSITY_INFO);
    }
  }

  vtkNew<vtkVolume16Reader> headReader;
  headReader->SetDataDimensions(64, 64);
  headReader->SetImageRange(1, 93);
  headReader->SetDataByteOrderToLittleEndian();
  char* fname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/headsq/quarter");
  headReader->SetFilePrefix(fname);
  headReader->SetDataSpacing(3.2, 3.2, 1.5);
  delete[] fname;

  // Upsample data
  vtkNew<vtkImageResize> resample;
  resample->SetInputConnection(headReader->GetOutputPort());
  resample->SetResizeMethodToOutputDimensions();
  resample->SetOutputDimensions(512, 512, 512);
  resample->Update();

  vtkNew<vtkOpenGLGPUVolumeRayCastMapper> volumeMapper;
  volumeMapper->SetInputConnection(resample->GetOutputPort());

  double scalarRange[2];
  volumeMapper->GetInput()->GetScalarRange(scalarRange);
  volumeMapper->SetBlendModeToComposite();

  vtkNew<vtkRenderWindow> renWin;
  renWin->SetMultiSamples(0);

  vtkNew<vtkRenderer> ren;
  ren->SetBackground(0.2, 0.2, 0.5);

  renWin->AddRenderer(ren);
  renWin->SetSize(400, 400);

  vtkNew<vtkRenderWindowInteractor> iren;
  iren->SetRenderWindow(renWin);
  //  vtkNew<vtkInteractorStyleTrackballCamera> style;
  //  iren->SetInteractorStyle(style);

  vtkNew<vtkPiecewiseFunction> pf;
  pf->AddPoint(0, 0.00);
  pf->AddPoint(500, 0.02);
  pf->AddPoint(1000, 0.02);
  pf->AddPoint(1150, 0.85);

  vtkNew<vtkPiecewiseFunction> gf;
  gf->AddPoint(0, 0.0);
  gf->AddPoint(90, 0.5);
  gf->AddPoint(100, 0.7);

  vtkNew<vtkColorTransferFunction> ctf;
  ctf->AddRGBPoint(0, 0.0, 0.0, 0.0);
  ctf->AddRGBPoint(500, 1.0, 0.5, 0.3);
  ctf->AddRGBPoint(1000, 1.0, 0.5, 0.3);
  ctf->AddRGBPoint(1150, 1.0, 1.0, 0.9);

  vtkNew<vtkVolumeProperty> volumeProperty;
  // volumeProperty->ShadeOff();
  volumeProperty->SetInterpolationType(VTK_LINEAR_INTERPOLATION);
  volumeProperty->SetScalarOpacity(pf);
  volumeProperty->SetGradientOpacity(gf);
  volumeProperty->SetColor(ctf);

  vtkNew<vtkVolume> volume;
  volume->SetMapper(volumeMapper);
  volume->SetProperty(volumeProperty);
  ren->AddVolume(volume);

  vtkNew<vtkAnariPass> anariPass;
  ren->SetPass(anariPass);

  if (useDebugDevice)
  {
    vtkAnariRendererNode::SetUseDebugDevice(1, ren);
    vtkNew<vtkTesting> testing;

    std::string traceDir = testing->GetTempDirectory();
    traceDir += "/anari-trace";
    traceDir += "/TestAnariVolumeRenderer";
    vtkAnariRendererNode::SetDebugDeviceDirectory(traceDir.c_str(), ren);
  }

  SetAnariRendererParameterDefaults(ren, useDebugDevice, "TestAnariVolumeRenderer");

  auto cam = ren->GetActiveCamera();
  cam->SetFocalPoint(85.7721, 88.4044, 33.8576);
  cam->SetPosition(-173.392, 611.09, -102.892);
  cam->SetViewUp(0.130638, -0.194997, -0.972065);

  renWin->Render();

  auto anariRendererNode = anariPass->GetSceneGraph();
  auto extensions = anariRendererNode->GetAnariDeviceExtensions();

  if (extensions.ANARI_KHR_SPATIAL_FIELD_STRUCTURED_REGULAR)
  {
    int retVal = vtkRegressionTestImage(renWin);

    if (retVal == vtkRegressionTester::DO_INTERACTOR)
    {
      iren->Initialize();
      iren->SetDesiredUpdateRate(30.0);
      iren->Start();
    }

    return !retVal;
  }

  std::cout << "Required feature KHR_VOLUME_TRANSFER_FUNCTION1D not supported." << std::endl;
  return VTK_SKIP_RETURN_CODE;
}
