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

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

#include "vtkCellArray.h"
#include "vtkIdTypeArray.h"
#include "vtkObjectFactory.h"
#include "vtkUnsignedCharArray.h"
#include "vtkUnstructuredGrid.h"
#include "vtkXMLDataElement.h"
#include "vtkXMLUnstructuredGridReader.h"
#include "vtkInformation.h"
#include "vtkStreamingDemandDrivenPipeline.h"

vtkStandardNewMacro(vtkXMLPUnstructuredGridReader);

//----------------------------------------------------------------------------
vtkXMLPUnstructuredGridReader::vtkXMLPUnstructuredGridReader()
{
}

//----------------------------------------------------------------------------
vtkXMLPUnstructuredGridReader::~vtkXMLPUnstructuredGridReader()
{
}

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

//----------------------------------------------------------------------------
vtkUnstructuredGrid* vtkXMLPUnstructuredGridReader::GetOutput()
{
  return this->GetOutput(0);
}

//----------------------------------------------------------------------------
vtkUnstructuredGrid* vtkXMLPUnstructuredGridReader::GetOutput(int idx)
{
  return vtkUnstructuredGrid::SafeDownCast( this->GetOutputDataObject(idx) );
}

//----------------------------------------------------------------------------
const char* vtkXMLPUnstructuredGridReader::GetDataSetName()
{
  return "PUnstructuredGrid";
}

//----------------------------------------------------------------------------
void vtkXMLPUnstructuredGridReader::GetOutputUpdateExtent(int& piece,
                                                          int& numberOfPieces,
                                                          int& ghostLevel)
{
  vtkInformation* outInfo = this->GetCurrentOutputInformation();
  piece = outInfo->Get(
      vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER());
  numberOfPieces = outInfo->Get(
      vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES());
  ghostLevel = outInfo->Get(
      vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS());
}

//----------------------------------------------------------------------------
void vtkXMLPUnstructuredGridReader::SetupOutputTotals()
{
  this->Superclass::SetupOutputTotals();
  // Find the total size of the output.
  int i;
  this->TotalNumberOfCells = 0;
  for(i=this->StartPiece; i < this->EndPiece; ++i)
    {
    if(this->PieceReaders[i])
      {
      this->TotalNumberOfCells += this->PieceReaders[i]->GetNumberOfCells();
      }
    }
  
  // Data reading will start at the beginning of the output.
  this->StartCell = 0;
}

//----------------------------------------------------------------------------
void vtkXMLPUnstructuredGridReader::SetupOutputData()
{
  this->Superclass::SetupOutputData();
  
  vtkUnstructuredGrid* output = vtkUnstructuredGrid::SafeDownCast(
    this->GetCurrentOutput());
  
  // Setup the output's cell arrays.
  vtkUnsignedCharArray* cellTypes = vtkUnsignedCharArray::New();
  cellTypes->SetNumberOfTuples(this->GetNumberOfCells());
  vtkCellArray* outCells = vtkCellArray::New();
  
  vtkIdTypeArray* locations = vtkIdTypeArray::New();
  locations->SetNumberOfTuples(this->GetNumberOfCells());
  
  output->SetCells(cellTypes, locations, outCells);
  
  locations->Delete();
  outCells->Delete();
  cellTypes->Delete();
}

//----------------------------------------------------------------------------
void vtkXMLPUnstructuredGridReader::SetupNextPiece()
{
  this->Superclass::SetupNextPiece();  
  if(this->PieceReaders[this->Piece])
    {
    this->StartCell += this->PieceReaders[this->Piece]->GetNumberOfCells();
    }
}

//----------------------------------------------------------------------------
int vtkXMLPUnstructuredGridReader::ReadPieceData()
{
  if(!this->Superclass::ReadPieceData()) { return 0; }
  
  vtkPointSet* ips = this->GetPieceInputAsPointSet(this->Piece);
  vtkUnstructuredGrid* input = static_cast<vtkUnstructuredGrid*>(ips);
  vtkUnstructuredGrid* output = vtkUnstructuredGrid::SafeDownCast(
      this->GetCurrentOutput());  
  
  // Save the start location where the new cell connectivity will be
  // appended.
  vtkIdType startLoc = 0;
  if(output->GetCells()->GetData())
    {
    startLoc = output->GetCells()->GetData()->GetNumberOfTuples();
    }
  
  // Copy the Cells.
  this->CopyCellArray(this->TotalNumberOfCells, input->GetCells(),
                      output->GetCells());
  
  // Copy the cell locations with offset adjustment.
  vtkIdTypeArray* inLocations = input->GetCellLocationsArray();
  vtkIdTypeArray* outLocations = output->GetCellLocationsArray();
  vtkIdType* inLocs = inLocations->GetPointer(0);
  vtkIdType* outLocs = outLocations->GetPointer(this->StartCell);
  vtkIdType numCells = inLocations->GetNumberOfTuples();
  vtkIdType i;
  for(i=0;i < numCells; ++i)
    {
    outLocs[i] = inLocs[i] + startLoc;
    }
  
  // Copy the cooresponding cell types.
  vtkUnsignedCharArray* inTypes = input->GetCellTypesArray();
  vtkUnsignedCharArray* outTypes = output->GetCellTypesArray();
  vtkIdType components = outTypes->GetNumberOfComponents();  
  memcpy(outTypes->GetVoidPointer(this->StartCell*components),
         inTypes->GetVoidPointer(0),
         inTypes->GetNumberOfTuples()*components*inTypes->GetDataTypeSize());
    
  return 1;
}

//----------------------------------------------------------------------------
void vtkXMLPUnstructuredGridReader::CopyArrayForCells(vtkDataArray* inArray,
                                                      vtkDataArray* outArray)
{
  if(!this->PieceReaders[this->Piece])
    {
    return;
    }
  if(!inArray || !outArray)
    {
    return;
    }
  
  vtkIdType numCells = this->PieceReaders[this->Piece]->GetNumberOfCells();
  vtkIdType components = outArray->GetNumberOfComponents();
  vtkIdType tupleSize = inArray->GetDataTypeSize()*components;
  memcpy(outArray->GetVoidPointer(this->StartCell*components),
         inArray->GetVoidPointer(0), numCells*tupleSize);
}

//----------------------------------------------------------------------------
vtkXMLDataReader* vtkXMLPUnstructuredGridReader::CreatePieceReader()
{
  return vtkXMLUnstructuredGridReader::New();
}


int vtkXMLPUnstructuredGridReader::FillOutputPortInformation(int, vtkInformation *info)
  {
  info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkUnstructuredGrid");
  return 1;
  }