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

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

#include "vtkTemporalDataSet.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <math.h>

vtkStandardNewMacro(vtkTemporalSnapToTimeStep);

//----------------------------------------------------------------------------
vtkTemporalSnapToTimeStep::vtkTemporalSnapToTimeStep()
{
  this->HasDiscrete = 0;
  this->SnapMode = 0;
}

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

//----------------------------------------------------------------------------
// Change the information
int vtkTemporalSnapToTimeStep::RequestInformation (
  vtkInformation * vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  this->HasDiscrete = 0;

  // unset the time steps if they are set
  if (outInfo->Has(vtkStreamingDemandDrivenPipeline::TIME_STEPS()))
    {
    outInfo->Remove(vtkStreamingDemandDrivenPipeline::TIME_STEPS());
    }

  if (inInfo->Has(vtkStreamingDemandDrivenPipeline::TIME_STEPS()))
    {
    int numTimes =
      inInfo->Length(vtkStreamingDemandDrivenPipeline::TIME_STEPS());
    this->InputTimeValues.resize(numTimes);
    inInfo->Get( vtkStreamingDemandDrivenPipeline::TIME_STEPS(), 
      &this->InputTimeValues[0] );
    this->HasDiscrete = 1;
    }

  if (inInfo->Has(vtkStreamingDemandDrivenPipeline::TIME_RANGE()))
    {
    double *inRange =
      inInfo->Get(vtkStreamingDemandDrivenPipeline::TIME_RANGE());
    double outRange[2];
    outRange[0] = inRange[0];
    outRange[1] = inRange[1];
    outInfo->Set(vtkStreamingDemandDrivenPipeline::TIME_RANGE(),
                 outRange,2);
    }
  return 1;
}

//----------------------------------------------------------------------------
// This method simply copies by reference the input data to the output.
int vtkTemporalSnapToTimeStep::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
  
  vtkTemporalDataSet *inData = vtkTemporalDataSet::SafeDownCast
    (inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkTemporalDataSet *outData = vtkTemporalDataSet::SafeDownCast
    (outInfo->Get(vtkDataObject::DATA_OBJECT()));
  
  // shallow copy the data
  if (inData && outData)
    {
    outData->ShallowCopy(inData);
    }
  
  // fill in the time steps
  int inLength = 
    inData->GetInformation()->Length(vtkDataObject::DATA_TIME_STEPS());
  double *inTimes = 
    inData->GetInformation()->Get(vtkDataObject::DATA_TIME_STEPS());
  double *outTimes = new double [inLength];
  int i;
  for (i = 0; i < inLength; ++i)
    {
    outTimes[i] = inTimes[i];
    }
  outData->GetInformation()->Set(vtkDataObject::DATA_TIME_STEPS(),
                                 outTimes, inLength);
  delete [] outTimes;
                                 
  return 1;
}

//----------------------------------------------------------------------------
int vtkTemporalSnapToTimeStep::RequestUpdateExtent (
  vtkInformation * vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);

  // find the nearest timestep in the input
  if (outInfo->Has(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS()))
    {
    double *upTimes =
      outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS());
    int numTimes = 
      outInfo->Length(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS());
    double *inTimes = new double [numTimes];
    int i;
    for (i = 0; i < numTimes; ++i)
      {
      if (!this->HasDiscrete || this->InputTimeValues.size()==0) 
        {
        inTimes[i] = upTimes[i];
        }
      else
        {
        double dist = VTK_DOUBLE_MAX;
        int index = -1;
        for (unsigned int t=0; t<this->InputTimeValues.size(); t++) 
          {
          double thisdist = fabs(upTimes[i]-this->InputTimeValues[t]);
          if (this->SnapMode==VTK_SNAP_NEAREST && thisdist<dist) 
            {
            index = t;
            dist = thisdist;
            }
          else if (this->SnapMode==VTK_SNAP_NEXTBELOW_OR_EQUAL) 
            {
            if (this->InputTimeValues[t]==upTimes[i])
              {
              index = t;
              break;
              }
            else if (this->InputTimeValues[t]<upTimes[i])
              {
              index = t;
              }
            else if (this->InputTimeValues[t]>upTimes[i])
              {
              break;
              }
            }
          else if (this->SnapMode==VTK_SNAP_NEXTABOVE_OR_EQUAL) 
            {
            if (this->InputTimeValues[t]==upTimes[i])
              {
              index = t;
              break;
              }
            else if (this->InputTimeValues[t]>upTimes[i])
              {
              index = t;
              break;
              }
            }
          }
        upTimes[i] = this->InputTimeValues[index==-1 ? 0 : index];
        }
      }
    inInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEPS(),
                upTimes,numTimes);
    delete [] inTimes;
    }

  return 1;
}
//----------------------------------------------------------------------------
void vtkTemporalSnapToTimeStep::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "SnapMode: " << this->SnapMode << endl;
}
//----------------------------------------------------------------------------