// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
// This example demonstrates how to implement a vtkGenericDataSet
// (here vtkBridgeDataSet) and to use vtkGenericDataSetTessellator filter on
// it.
//
// The command line arguments are:
// -I        => run in interactive mode; unless this is used, the program will
//              not allow interaction and exit
// -D <path> => path to the data; the data should be in <path>/Data/

// #define WRITE_GENERIC_RESULT

#include "vtkActor.h"
#include "vtkActor2D.h"
#include "vtkAttributesErrorMetric.h"
#include "vtkBridgeDataSet.h"
#include "vtkCamera.h"
#include "vtkCommand.h"
#include "vtkDataSetMapper.h"
#include "vtkDebugLeaks.h"
#include "vtkGenericAttribute.h"
#include "vtkGenericAttributeCollection.h"
#include "vtkGenericCellTessellator.h"
#include "vtkGenericDataSetTessellator.h"
#include "vtkGenericGeometryFilter.h"
#include "vtkGenericOutlineFilter.h"
#include "vtkGenericSubdivisionErrorMetric.h"
#include "vtkGeometricErrorMetric.h"
#include "vtkLabeledDataMapper.h"
#include "vtkLookupTable.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkSimpleCellTessellator.h"
#include "vtkTestUtilities.h"
#include "vtkUnstructuredGrid.h"
#include "vtkViewDependentErrorMetric.h"
#include "vtkXMLUnstructuredGridReader.h"
#include <cassert>

#ifdef WRITE_GENERIC_RESULT
#include "vtkXMLUnstructuredGridWriter.h"

#include <iostream>

#endif // #ifdef WRITE_GENERIC_RESULT

// Remark about the lookup tables that seem different between the
// GenericGeometryFilter and GenericDataSetTessellator:
// the lookup table is set for the whole unstructured grid, the tetra plus
// the triangle. The lookup table changed because of the tetra: the
// GenericDataSetTessellator need to create inside sub-tetra that have
// minimal attributes, the GenericGeometryFilter just need to tessellate the
// face of the tetra, for which the values at points are not minimal.

class SwitchLabelsCallback : public vtkCommand
{
public:
  static SwitchLabelsCallback* New() { return new SwitchLabelsCallback; }

  void SetLabeledDataMapper(vtkLabeledDataMapper* aLabeledDataMapper)
  {
    this->LabeledDataMapper = aLabeledDataMapper;
  }
  void SetRenderWindow(vtkRenderWindow* aRenWin) { this->RenWin = aRenWin; }

  virtual void Execute(vtkObject* vtkNotUsed(caller), unsigned long, void*)
  {
    if (this->LabeledDataMapper->GetLabelMode() == VTK_LABEL_SCALARS)
    {
      this->LabeledDataMapper->SetLabelMode(VTK_LABEL_IDS);
    }
    else
    {
      this->LabeledDataMapper->SetLabelMode(VTK_LABEL_SCALARS);
    }
    this->RenWin->Render();
  }

protected:
  vtkLabeledDataMapper* LabeledDataMapper;
  vtkRenderWindow* RenWin;
};

int TestViewDependentErrorMetric(int argc, char* argv[])
{
  // Standard rendering classes
  vtkRenderer* renderer = vtkRenderer::New();
  vtkRenderer* renderer2 = vtkRenderer::New();
  vtkRenderWindow* renWin = vtkRenderWindow::New();
  renWin->AddRenderer(renderer);
  renWin->AddRenderer(renderer2);
  vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  // Load the mesh geometry and data from a file
  vtkXMLUnstructuredGridReader* reader = vtkXMLUnstructuredGridReader::New();
  char* cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/quadraticTetra01.vtu");
  reader->SetFileName(cfname);
  delete[] cfname;

  // Force reading
  reader->Update();

  // Initialize the bridge
  vtkBridgeDataSet* ds = vtkBridgeDataSet::New();
  ds->SetDataSet(reader->GetOutput());
  reader->Delete();
#if 0
  // Set the error metric thresholds:
  // 1. for the geometric error metric
  vtkGeometricErrorMetric *geometricError=vtkGeometricErrorMetric::New();
  geometricError->SetRelativeGeometricTolerance(0.01,ds);

  ds->GetTessellator()->GetErrorMetrics()->AddItem(geometricError);
  geometricError->Delete();

  // 2. for the attribute error metric
  vtkAttributesErrorMetric *attributesError=vtkAttributesErrorMetric::New();
  attributesError->SetAttributeTolerance(0.01); // 0.11

  ds->GetTessellator()->GetErrorMetrics()->AddItem(attributesError);
  attributesError->Delete();
#endif

  // 3. for the view dependent error metric on the first renderer
  vtkViewDependentErrorMetric* viewError = vtkViewDependentErrorMetric::New();
  viewError->SetViewport(renderer);
  viewError->SetPixelTolerance(10000); // 0.25; 0.0625
  ds->GetTessellator()->GetErrorMetrics()->AddItem(viewError);
  viewError->Delete();

  // 4. for the view dependent error metric on the first renderer
  vtkViewDependentErrorMetric* viewError2 = vtkViewDependentErrorMetric::New();
  viewError2->SetViewport(renderer2);
  viewError2->SetPixelTolerance(0.25); // 0.25; 0.0625
  ds->GetTessellator()->GetErrorMetrics()->AddItem(viewError2);
  viewError2->Delete();

  std::cout << "input unstructured grid: " << ds << std::endl;

  static_cast<vtkSimpleCellTessellator*>(ds->GetTessellator())->SetMaxSubdivisionLevel(10);

  vtkIndent indent;
  ds->PrintSelf(std::cout, indent);

#if 0
  // Create the filter
  vtkGenericDataSetTessellator *tessellator = vtkGenericDataSetTessellator::New();
  tessellator->SetInputData(ds);

  // DO NOT PERFORM UPDATE NOW, because the view dependent error metric
  // need the window to be realized first
  //tessellator->Update(); //So that we can call GetRange() on the scalars

  assert(tessellator->GetOutput()!=0);
#else
  // Create the filter
  vtkGenericGeometryFilter* tessellator = vtkGenericGeometryFilter::New();
  tessellator->SetInputData(ds);

  //  geom->Update(); //So that we can call GetRange() on the scalars

#endif

  // This creates a blue to red lut.
  vtkLookupTable* lut = vtkLookupTable::New();
  lut->SetHueRange(0.667, 0.0);

  vtkDataSetMapper* mapper = vtkDataSetMapper::New();
  mapper->SetLookupTable(lut);
  mapper->SetInputConnection(tessellator->GetOutputPort());

  int i = 0;
  int n = ds->GetAttributes()->GetNumberOfAttributes();
  int found = 0;
  vtkGenericAttribute* attribute = 0;
  while (i < n && !found)
  {
    attribute = ds->GetAttributes()->GetAttribute(i);
    found =
      (attribute->GetCentering() == vtkPointCentered && attribute->GetNumberOfComponents() == 1);
    ++i;
  }
  if (found)
  {
    mapper->SetScalarRange(attribute->GetRange(0));
  }
  mapper->ScalarVisibilityOff();

  vtkActor* actor = vtkActor::New();
  actor->SetMapper(mapper);

  vtkActor2D* actorLabel = vtkActor2D::New();
  vtkLabeledDataMapper* labeledDataMapper = vtkLabeledDataMapper::New();
  labeledDataMapper->SetLabelMode(VTK_LABEL_IDS);
  labeledDataMapper->SetInputConnection(tessellator->GetOutputPort());
  actorLabel->SetMapper(labeledDataMapper);
  labeledDataMapper->Delete();
  renderer->AddActor(actorLabel);
  actorLabel->SetVisibility(0);
  actorLabel->Delete();

  // Standard testing code.
  renderer->SetBackground(0.7, 0.5, 0.5);
  renderer->SetViewport(0, 0, 0.5, 1);
  renderer2->SetBackground(0.5, 0.5, 0.8);
  renderer2->SetViewport(0.5, 0, 1, 1);
  renWin->SetSize(600, 300); // realized

  vtkGenericOutlineFilter* outlineFilter = vtkGenericOutlineFilter::New();
  outlineFilter->SetInputData(ds);
  vtkPolyDataMapper* mapperOutline = vtkPolyDataMapper::New();
  mapperOutline->SetInputConnection(outlineFilter->GetOutputPort());
  outlineFilter->Delete();

  vtkActor* actorOutline = vtkActor::New();
  actorOutline->SetMapper(mapperOutline);
  mapperOutline->Delete();

  renderer->AddActor(actorOutline);
  renderer2->AddActor(actorOutline);
  actorOutline->Delete();
  // need an outline filter in the pipeline to ensure that the
  // camera are set with the bounding box of the dataset.

  //  vtkCamera *cam1=renderer->GetActiveCamera();
  vtkCamera* cam2 = renderer2->GetActiveCamera();

  renderer->ResetCamera();
  renderer2->ResetCamera();

  cam2->Azimuth(90);

  // Those two lines have to be called AFTER GetActiveCamera:
  // GetActiveCamera ask the mapper to update its input for the bounds
  // If the actor is connected it actually ask the output of tessellator
  // but the view dependent error metric are not yet initialized!
  renderer->AddActor(actor);
  renderer2->AddActor(actor);

  renWin->Render();

#ifdef WRITE_GENERIC_RESULT
  // BE SURE to save AFTER a first rendering!
  // Save the result of the filter in a file
  vtkXMLUnstructuredGridWriter* writer = vtkXMLUnstructuredGridWriter::New();
  writer->SetInputConnection(tessellator->GetOutputPort());
  writer->SetFileName("viewdeptessellated.vtu");
  writer->SetDataModeToAscii();
  writer->DebugOn();
  writer->Write();
  writer->Delete();

  // debug XML reader
  vtkXMLUnstructuredGridReader* rreader = vtkXMLUnstructuredGridReader::New();
  //  rreader->SetInputConnection(tessellator->GetOutputPort());
  rreader->SetFileName("viewdeptessellated.vtu");
  //  rreader->SetDataModeToAscii();
  rreader->DebugOn();
  rreader->Update();
  rreader->Delete();

#endif // #ifdef WRITE_GENERIC_RESULT

  tessellator->GetOutput()->PrintSelf(std::cout, indent);

  int retVal = vtkRegressionTestImage(renWin);
  if (retVal == vtkRegressionTester::DO_INTERACTOR)
  {
    SwitchLabelsCallback* switchLabels = SwitchLabelsCallback::New();
    switchLabels->SetRenderWindow(renWin);
    switchLabels->SetLabeledDataMapper(labeledDataMapper);
    iren->AddObserver(vtkCommand::UserEvent, switchLabels);
    switchLabels->Delete();
    iren->Start();
  }

  // Cleanup
  renderer2->Delete();
  renderer->Delete();
  renWin->Delete();
  iren->Delete();
  mapper->Delete();
  actor->Delete();
  tessellator->Delete();
  ds->Delete();
  lut->Delete();

  return !retVal;
}