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

  Program:   Visualization Toolkit
  Module:    vtkProcessIdScalars.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 "vtkProcessIdScalars.h"

#include "vtkCellData.h"
#include "vtkDataSet.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkIntArray.h"
#include "vtkMath.h"
#include "vtkMultiProcessController.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkStandardNewMacro(vtkProcessIdScalars);

vtkCxxSetObjectMacro(vtkProcessIdScalars, Controller, vtkMultiProcessController);

//----------------------------------------------------------------------------
vtkProcessIdScalars::vtkProcessIdScalars()
{
  this->CellScalarsFlag = 0;
  this->RandomMode = 0;

  this->Controller = vtkMultiProcessController::GetGlobalController();
  if (this->Controller)
  {
    this->Controller->Register(this);
  }
}

//----------------------------------------------------------------------------
vtkProcessIdScalars::~vtkProcessIdScalars()
{
  if (this->Controller)
  {
    this->Controller->Delete();
    this->Controller = nullptr;
  }
}

//----------------------------------------------------------------------------
// Append data sets into single unstructured grid
int vtkProcessIdScalars::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
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkDataSet* output = vtkDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkDataArray* pieceColors;
  vtkIdType num;

  if (this->CellScalarsFlag)
  {
    num = input->GetNumberOfCells();
  }
  else
  {
    num = input->GetNumberOfPoints();
  }

  int piece = (this->Controller ? this->Controller->GetLocalProcessId() : 0);

  if (this->RandomMode)
  {
    pieceColors = this->MakeRandomScalars(piece, num);
  }
  else
  {
    pieceColors = this->MakeProcessIdScalars(piece, num);
  }

  output->ShallowCopy(input);
  pieceColors->SetName("ProcessId");
  if (this->CellScalarsFlag)
  {
    output->GetCellData()->AddArray(pieceColors);
    output->GetCellData()->SetActiveScalars(pieceColors->GetName());
  }
  else
  {
    output->GetPointData()->AddArray(pieceColors);
    output->GetPointData()->SetActiveScalars(pieceColors->GetName());
  }

  pieceColors->Delete();

  return 1;
}

//----------------------------------------------------------------------------
vtkIntArray* vtkProcessIdScalars::MakeProcessIdScalars(int piece, vtkIdType num)
{
  vtkIntArray* pieceColors = vtkIntArray::New();
  pieceColors->SetNumberOfTuples(num);

  for (vtkIdType i = 0; i < num; ++i)
  {
    pieceColors->SetValue(i, piece);
  }

  return pieceColors;
}

//----------------------------------------------------------------------------
vtkFloatArray* vtkProcessIdScalars::MakeRandomScalars(int piece, vtkIdType num)
{
  vtkMath::RandomSeed(piece);
  float randomValue = vtkMath::Random();

  vtkFloatArray* pieceColors = vtkFloatArray::New();
  pieceColors->SetNumberOfTuples(num);

  for (vtkIdType i = 0; i < num; ++i)
  {
    pieceColors->SetValue(i, randomValue);
  }

  return pieceColors;
}

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

  os << indent << "RandomMode: " << this->RandomMode << endl;
  if (this->CellScalarsFlag)
  {
    os << indent << "ScalarMode: CellData\n";
  }
  else
  {
    os << indent << "ScalarMode: PointData\n";
  }

  os << indent << "Controller: ";
  if (this->Controller)
  {
    this->Controller->PrintSelf(os, indent.GetNextIndent());
  }
  else
  {
    os << "(none)" << endl;
  }
}
