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

  Program:   Visualization Toolkit
  Module:    vtkGraphAlgorithm.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.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkGraphAlgorithm.h"

#include "vtkCommand.h"
#include "vtkGraph.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkStandardNewMacro(vtkGraphAlgorithm);

//------------------------------------------------------------------------------
vtkGraphAlgorithm::vtkGraphAlgorithm()
{
  // by default assume filters have one input and one output
  // subclasses that deviate should modify this setting
  this->SetNumberOfInputPorts(1);
  this->SetNumberOfOutputPorts(1);
}

//------------------------------------------------------------------------------
vtkGraphAlgorithm::~vtkGraphAlgorithm() = default;

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

//------------------------------------------------------------------------------
vtkTypeBool vtkGraphAlgorithm::ProcessRequest(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // generate the data
  if (request->Has(vtkDemandDrivenPipeline::REQUEST_DATA()))
  {
    return this->RequestData(request, inputVector, outputVector);
  }

  if (request->Has(vtkStreamingDemandDrivenPipeline::REQUEST_UPDATE_EXTENT()))
  {
    return this->RequestUpdateExtent(request, inputVector, outputVector);
  }

  // create the output
  if (request->Has(vtkDemandDrivenPipeline::REQUEST_DATA_OBJECT()))
  {
    return this->RequestDataObject(request, inputVector, outputVector);
  }

  // execute information
  if (request->Has(vtkDemandDrivenPipeline::REQUEST_INFORMATION()))
  {
    return this->RequestInformation(request, inputVector, outputVector);
  }

  return this->Superclass::ProcessRequest(request, inputVector, outputVector);
}

//------------------------------------------------------------------------------
int vtkGraphAlgorithm::FillOutputPortInformation(int vtkNotUsed(port), vtkInformation* info)
{
  // now add our info
  info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkGraph");
  return 1;
}

//------------------------------------------------------------------------------
int vtkGraphAlgorithm::FillInputPortInformation(int vtkNotUsed(port), vtkInformation* info)
{
  info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkGraph");
  return 1;
}

//------------------------------------------------------------------------------
vtkGraph* vtkGraphAlgorithm::GetOutput(int index)
{
  return vtkGraph::SafeDownCast(this->GetOutputDataObject(index));
}

//------------------------------------------------------------------------------
void vtkGraphAlgorithm::SetInputData(int index, vtkDataObject* input)
{
  this->SetInputDataInternal(index, input);
}

//------------------------------------------------------------------------------
int vtkGraphAlgorithm::RequestInformation(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* vtkNotUsed(outputVector))
{
  // do nothing let subclasses handle it
  return 1;
}

//------------------------------------------------------------------------------
int vtkGraphAlgorithm::RequestUpdateExtent(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* vtkNotUsed(outputVector))
{
  int numInputPorts = this->GetNumberOfInputPorts();
  for (int i = 0; i < numInputPorts; i++)
  {
    int numInputConnections = this->GetNumberOfInputConnections(i);
    for (int j = 0; j < numInputConnections; j++)
    {
      vtkInformation* inputInfo = inputVector[i]->GetInformationObject(j);
      inputInfo->Set(vtkStreamingDemandDrivenPipeline::EXACT_EXTENT(), 1);
    }
  }
  return 1;
}

//------------------------------------------------------------------------------
// This is the superclasses style of Execute method.  Convert it into
// an imaging style Execute method.
int vtkGraphAlgorithm::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* vtkNotUsed(outputVector))
{
  return 0;
}

//------------------------------------------------------------------------------
int vtkGraphAlgorithm::RequestDataObject(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  if (!inInfo)
  {
    return 0;
  }
  vtkGraph* input = vtkGraph::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));

  if (input)
  {
    // for each output
    for (int i = 0; i < this->GetNumberOfOutputPorts(); ++i)
    {
      vtkInformation* info = outputVector->GetInformationObject(i);
      vtkGraph* output = vtkGraph::SafeDownCast(info->Get(vtkDataObject::DATA_OBJECT()));

      if (!output || !output->IsA(input->GetClassName()))
      {
        output = input->NewInstance();
        info->Set(vtkDataObject::DATA_OBJECT(), output);
        output->Delete();
      }
    }
    return 1;
  }
  return 0;
}
