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

  Program:   Visualization Toolkit
  Module:    vtkGenericContourFilter.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkGenericContourFilter.h"
#include "vtkCell.h"
#include "vtkLine.h"
#include "vtkCellArray.h"
#include "vtkMergePoints.h"
#include "vtkContourValues.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkTimerLog.h"
#include "vtkUnstructuredGrid.h"
#include "vtkContourGrid.h"
#include "vtkDoubleArray.h"
#include "vtkPointData.h"
#include "vtkGenericCellIterator.h"
#include "vtkCellData.h"
#include "vtkGenericAdaptorCell.h"
#include "vtkPolyData.h"
#include "vtkGenericDataSet.h"
#include "vtkGenericAttributeCollection.h"
#include "vtkGenericAttribute.h"
#include "vtkGenericCellTessellator.h"
#include "vtkIncrementalPointLocator.h"

vtkStandardNewMacro(vtkGenericContourFilter);

vtkCxxSetObjectMacro(vtkGenericContourFilter,Locator,vtkIncrementalPointLocator);

// Construct object with initial range (0,1) and single contour value
// of 0.0.
vtkGenericContourFilter::vtkGenericContourFilter()
{
  this->ContourValues = vtkContourValues::New();

  this->ComputeNormals = 1;
  this->ComputeGradients = 0;
  this->ComputeScalars = 1;

  this->Locator = nullptr;

  this->InputScalarsSelection = nullptr;

  this->InternalPD = vtkPointData::New();
  this->SecondaryPD = vtkPointData::New();
  this->SecondaryCD = vtkCellData::New();
}

//-----------------------------------------------------------------------------
vtkGenericContourFilter::~vtkGenericContourFilter()
{
  this->ContourValues->Delete();
  if ( this->Locator )
  {
    this->Locator->UnRegister(this);
    this->Locator = nullptr;
  }
  this->SetInputScalarsSelection(nullptr);
  this->InternalPD->Delete();
  this->SecondaryPD->Delete();
  this->SecondaryCD->Delete();
}

//-----------------------------------------------------------------------------
// Overload standard modified time function. If contour values are modified,
// then this object is modified as well.
vtkMTimeType vtkGenericContourFilter::GetMTime()
{
  vtkMTimeType mTime = this->Superclass::GetMTime();
  vtkMTimeType time;

  if (this->ContourValues)
  {
    time = this->ContourValues->GetMTime();
    mTime = ( time > mTime ? time : mTime );
  }
  if (this->Locator)
  {
    time = this->Locator->GetMTime();
    mTime = ( time > mTime ? time : mTime );
  }

  // mTime should also take into account the fact that tessellator is view
  // dependent

  return mTime;
}

//-----------------------------------------------------------------------------
// General contouring filter.  Handles arbitrary input.
int vtkGenericContourFilter::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkGenericDataSet *input = vtkGenericDataSet::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData *output = vtkPolyData::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkDebugMacro(<< "Executing contour filter");

  if(!input)
  {
    vtkErrorMacro("No input specified");
    return 1;
  }
  vtkPointData *outPd = output->GetPointData();
  vtkCellData *outCd = output->GetCellData();

  // Create objects to hold output of contour operation. First estimate
  // allocation size.
  vtkIdType numCells=input->GetNumberOfCells();
  vtkIdType estimatedSize=input->GetEstimatedSize();
  estimatedSize = estimatedSize / 1024 * 1024; //multiple of 1024
  if (estimatedSize < 1024)
  {
    estimatedSize = 1024;
  }

  vtkPoints *newPts = vtkPoints::New();
  newPts->Allocate(estimatedSize,estimatedSize);
  vtkCellArray *newVerts = vtkCellArray::New();
  newVerts->Allocate(estimatedSize,estimatedSize);
  vtkCellArray *newLines = vtkCellArray::New();
  newLines->Allocate(estimatedSize,estimatedSize);
  vtkCellArray *newPolys = vtkCellArray::New();
  newPolys->Allocate(estimatedSize,estimatedSize);

  output->Allocate(numCells);

  // locator used to merge potentially duplicate points
  if(this->Locator==nullptr)
  {
    this->CreateDefaultLocator();
  }
  this->Locator->InitPointInsertion(newPts,input->GetBounds(),estimatedSize);

  // prepare the output attributes
  vtkGenericAttributeCollection *attributes=input->GetAttributes();
  vtkGenericAttribute *attribute;
  vtkDataArray *attributeArray;

  int c = attributes->GetNumberOfAttributes();
  vtkDataSetAttributes *secondaryAttributes;

  int attributeType;

  for(vtkIdType i = 0; i<c; ++i)
  {
    attribute=attributes->GetAttribute(i);
    attributeType=attribute->GetType();
    if(attribute->GetCentering()==vtkPointCentered)
    {
      secondaryAttributes = this->SecondaryPD;

      attributeArray = vtkDataArray::CreateDataArray(attribute->GetComponentType());
      attributeArray->SetNumberOfComponents(attribute->GetNumberOfComponents());
      attributeArray->SetName(attribute->GetName());
      this->InternalPD->AddArray(attributeArray);
      attributeArray->Delete();
      if(this->InternalPD->GetAttribute(attributeType))
      {
        this->InternalPD->SetActiveAttribute(
          this->InternalPD->GetNumberOfArrays()-1,attributeType);
      }
    }
    else // vtkCellCentered
    {
      secondaryAttributes = this->SecondaryCD;
    }

    attributeArray=vtkDataArray::CreateDataArray(attribute->GetComponentType());
    attributeArray->SetNumberOfComponents(attribute->GetNumberOfComponents());
    attributeArray->SetName(attribute->GetName());
    secondaryAttributes->AddArray(attributeArray);
    attributeArray->Delete();

    if(secondaryAttributes->GetAttribute(attributeType)==nullptr)
    {
      secondaryAttributes->SetActiveAttribute(secondaryAttributes->GetNumberOfArrays()-1,
                                              attributeType);
    }
  }

  outPd->InterpolateAllocate(this->SecondaryPD,estimatedSize,estimatedSize);
  outCd->CopyAllocate(this->SecondaryCD,estimatedSize,estimatedSize);


  vtkGenericAdaptorCell *cell;

  //----------- Begin of contouring algorithm --------------------//
  vtkGenericCellIterator *cellIt = input->NewCellIterator();

  if(this->InputScalarsSelection)
  {
    int attrib =
      input->GetAttributes()->FindAttribute(this->InputScalarsSelection);
    if(attrib != -1)
    {
      vtkGenericAttribute *a = input->GetAttributes()->GetAttribute(attrib);
      if(a->GetNumberOfComponents() == 1)
      {
        input->GetAttributes()->SetActiveAttribute(attrib,0);
      }
    }
  }


  vtkIdType updateCount = numCells/20 + 1;  // update roughly every 5%
  vtkIdType count = 0;
  int abortExecute = 0;

  input->GetTessellator()->InitErrorMetrics(input);

  for(cellIt->Begin(); !cellIt->IsAtEnd() && !abortExecute; cellIt->Next())
  {
    if ( !(count % updateCount) )
    {
      this->UpdateProgress(static_cast<double>(count) / numCells);
      abortExecute = this->GetAbortExecute();
    }

    cell = cellIt->GetCell();
    cell->Contour(this->ContourValues, nullptr, input->GetAttributes(),
                  input->GetTessellator(),
                  this->Locator, newVerts, newLines, newPolys, outPd, outCd,
                  this->InternalPD,this->SecondaryPD,this->SecondaryCD);
    ++count;
  } // for each cell
  cellIt->Delete();

  vtkDebugMacro(<<"Created: "
                << newPts->GetNumberOfPoints() << " points, "
                << newVerts->GetNumberOfCells() << " verts, "
                << newLines->GetNumberOfCells() << " lines, "
                << newPolys->GetNumberOfCells() << " triangles");

  //----------- End of contouring algorithm ----------------------//

  // Update ourselves.  Because we don't know up front how many verts, lines,
  // polys we've created, take care to reclaim memory.
  //
  output->SetPoints(newPts);
  newPts->Delete();

  if (newVerts->GetNumberOfCells()>0)
  {
    output->SetVerts(newVerts);
  }
  newVerts->Delete();

  if (newLines->GetNumberOfCells()>0)
  {
    output->SetLines(newLines);
  }
  newLines->Delete();

  if (newPolys->GetNumberOfCells()>0)
  {
    output->SetPolys(newPolys);
  }
  newPolys->Delete();

  this->Locator->Initialize();//releases leftover memory
  output->Squeeze();
  return 1;
}


//-----------------------------------------------------------------------------
// Specify a spatial locator for merging points. By default,
// an instance of vtkMergePoints is used.
void vtkGenericContourFilter::CreateDefaultLocator()
{
  if ( this->Locator == nullptr )
  {
    this->Locator = vtkMergePoints::New();
    this->Locator->Register(this);
    this->Locator->Delete();
  }
}

//-----------------------------------------------------------------------------
void vtkGenericContourFilter::SelectInputScalars(const char *fieldName)
{
  this->SetInputScalarsSelection(fieldName);
}

//-----------------------------------------------------------------------------
void vtkGenericContourFilter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  if (this->InputScalarsSelection)
  {
    os << indent << "InputScalarsSelection: "
       << this->InputScalarsSelection << endl;
  }

  os << indent << "Compute Gradients: "
     << (this->ComputeGradients ? "On\n" : "Off\n");
  os << indent << "Compute Normals: "
     << (this->ComputeNormals ? "On\n" : "Off\n");
  os << indent << "Compute Scalars: "
     << (this->ComputeScalars ? "On\n" : "Off\n");

  this->ContourValues->PrintSelf(os,indent.GetNextIndent());

  if ( this->Locator )
  {
    os << indent << "Locator: " << this->Locator << "\n";
  }
  else
  {
    os << indent << "Locator: (none)\n";
  }
}

//-----------------------------------------------------------------------------
// Description:
// Set a particular contour value at contour number i. The index i ranges
// between 0<=i<NumberOfContours.
void vtkGenericContourFilter::SetValue(int i, float value)
{
  this->ContourValues->SetValue(i,value);
}

//----------------------------------------------------------------------------
// Description:
// Get the ith contour value.
double vtkGenericContourFilter::GetValue(int i)
{
  return this->ContourValues->GetValue(i);
}

//----------------------------------------------------------------------------
// Description:
// Get a pointer to an array of contour values. There will be
// GetNumberOfContours() values in the list.
double *vtkGenericContourFilter::GetValues()
{
  return this->ContourValues->GetValues();
}

//----------------------------------------------------------------------------
// Description:
// Fill a supplied list with contour values. There will be
// GetNumberOfContours() values in the list. Make sure you allocate
// enough memory to hold the list.
void vtkGenericContourFilter::GetValues(double *contourValues)
{
  this->ContourValues->GetValues(contourValues);
}

//----------------------------------------------------------------------------
// Description:
// Set the number of contours to place into the list. You only really
// need to use this method to reduce list size. The method SetValue()
// will automatically increase list size as needed.
void vtkGenericContourFilter::SetNumberOfContours(int number)
{
  this->ContourValues->SetNumberOfContours(number);
}

//----------------------------------------------------------------------------
// Description:
// Get the number of contours in the list of contour values.
int vtkGenericContourFilter::GetNumberOfContours()
{
  return this->ContourValues->GetNumberOfContours();
}

//----------------------------------------------------------------------------
// Description:
// Generate numContours equally spaced contour values between specified
// range. Contour values will include min/max range values.
void vtkGenericContourFilter::GenerateValues(int numContours, double range[2])
{
  this->ContourValues->GenerateValues(numContours, range);
}

//----------------------------------------------------------------------------
// Description:
// Generate numContours equally spaced contour values between specified
// range. Contour values will include min/max range values.
void vtkGenericContourFilter::GenerateValues(int numContours, double
                                             rangeStart, double rangeEnd)
{
  this->ContourValues->GenerateValues(numContours, rangeStart, rangeEnd);
}

//----------------------------------------------------------------------------
int vtkGenericContourFilter::FillInputPortInformation(int port,
                                                      vtkInformation* info)
{
  if(!this->Superclass::FillInputPortInformation(port, info))
  {
    return 0;
  }
  info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkGenericDataSet");
  return 1;
}
