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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPOutlineFilter.cxx,v $

  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 "vtkPOutlineFilter.h"

#include "vtkCompositeDataSet.h"
#include "vtkDataSet.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkMultiProcessController.h"
#include "vtkObjectFactory.h"
#include "vtkOutlineSource.h"
#include "vtkPolyData.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkCxxRevisionMacro(vtkPOutlineFilter, "$Revision: 1.9 $");
vtkStandardNewMacro(vtkPOutlineFilter);
vtkCxxSetObjectMacro(vtkPOutlineFilter, Controller, vtkMultiProcessController);

vtkPOutlineFilter::vtkPOutlineFilter ()
{
  this->Controller = 0;
  this->SetController(vtkMultiProcessController::GetGlobalController());
  this->OutlineSource = vtkOutlineSource::New();
}

vtkPOutlineFilter::~vtkPOutlineFilter ()
{
  this->SetController(0);
  if (this->OutlineSource != NULL)
    {
    this->OutlineSource->Delete ();
    this->OutlineSource = NULL;
    }
}

int vtkPOutlineFilter::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 ouptut
  vtkDataSet *input = vtkDataSet::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData *output = vtkPolyData::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  double bds[6];
  int procid = 0;
  int numProcs = 1;

  if (this->Controller )
    {
    procid = this->Controller->GetLocalProcessId();
    numProcs = this->Controller->GetNumberOfProcesses();
    }

  int doCommunicate = 1;
  
  // If there is a composite dataset in the input, the request is
  // coming from a vtkCompositeDataPipeline and interprocess communication
  // is not necessary (simple datasets are not broken into pieces)
  vtkCompositeDataSet* cds = vtkCompositeDataSet::SafeDownCast(
    inInfo->Get(vtkCompositeDataSet::COMPOSITE_DATA_SET()));
  if (cds)
    {
    doCommunicate = 0;
    }

  input->GetBounds(bds);

  if (doCommunicate)
    {
    if ( procid )
      {
      // Satellite node
      this->Controller->Send(bds, 6, 0, 792390);
      }
    else
      {
      int idx;
      double tmp[6];

      for (idx = 1; idx < numProcs; ++idx)
        {
        this->Controller->Receive(tmp, 6, idx, 792390);
        if (tmp[0] < bds[0])
          {
          bds[0] = tmp[0];
          }
        if (tmp[1] > bds[1])
          {
          bds[1] = tmp[1];
          }
        if (tmp[2] < bds[2])
          {
          bds[2] = tmp[2];
          }
        if (tmp[3] > bds[3])
          {
          bds[3] = tmp[3];
          }
        if (tmp[4] < bds[4])
          {
          bds[4] = tmp[4];
          }
        if (tmp[5] > bds[5])
          {
          bds[5] = tmp[5];
          }
        }
      }
    }

  if (!doCommunicate || procid == 0)
    {
    if (vtkMath::AreBoundsInitialized(bds))
      {
      // only output in process 0.
      this->OutlineSource->SetBounds(bds);          
      this->OutlineSource->Update();
      output->CopyStructure(this->OutlineSource->GetOutput());
      }
    }

  return 1;
}

int vtkPOutlineFilter::RequestInformation(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **vtkNotUsed(inputVector),
  vtkInformationVector *outputVector)
{
  // get the info object
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  outInfo->Set(vtkStreamingDemandDrivenPipeline::MAXIMUM_NUMBER_OF_PIECES(),
               -1);
  return 1;
}

int vtkPOutlineFilter::FillInputPortInformation(int, vtkInformation *info)
{
  info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
  return 1;
}

void vtkPOutlineFilter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
  os << indent << "Controller: " << this->Controller << endl;
}