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

  Program:   Tensor ToolKit - TTK
  Module:    $URL$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) INRIA 2010. All rights reserved.
  See LICENSE.txt 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 notices for more information.

=========================================================================*/
#include "itkSyntheticTensorFieldGeneratorCommand.h"

#include "itkTensorImageIO.h"
#include "itkCrossingTensorImageSource.h"
#include "itkCircleTensorImageSource.h"

#include <iostream>
#include "GetPot.h"

namespace itk
{

  SyntheticTensorFieldGeneratorCommand::SyntheticTensorFieldGeneratorCommand()
  {
    m_ShortDescription = "Generate a synthetic crossing or circle tensor field";
    m_LongDescription = "Usage:\n";
    m_LongDescription += "-o <output file>\n";
    m_LongDescription += "-x <dim_x>\n";
    m_LongDescription += "-y <dim_y>\n";
    m_LongDescription += "-z <dim_z>\n";
    m_LongDescription += "-sx <spacing_x>\n";
    m_LongDescription += "-sy <spacing_y>\n";
    m_LongDescription += "-sz <spacing_z>\n";
    m_LongDescription += "-ox <origin_x>\n";
    m_LongDescription += "-oy <origin_y>\n";
    m_LongDescription += "-oz <origin_z>\n";
    m_LongDescription += "-t <type=crossing/circle>\n";
    m_LongDescription += "-c <number of crossings - default: 1>\n";
    m_LongDescription += "-r1 <radius1 - default: 1.0>\n";
    m_LongDescription += "-r2 <radius2 - default: 2.0>\n\n";
    m_LongDescription += m_ShortDescription;
  }

  SyntheticTensorFieldGeneratorCommand::~SyntheticTensorFieldGeneratorCommand()
  {}
  
  int SyntheticTensorFieldGeneratorCommand::Execute (int narg, const char* arg[])
  {
    
    GetPot cl (narg, const_cast<char**>(arg));
    if( cl.size()==1 || cl.search (2,"-h","--help") )
    {
      std::cout << this->GetLongDescription() << std::endl;
      return -1;
    }

    const char* output = cl.follow ("tensors.nii.gz", 2, "-o", "-O");
    const char* type = cl.follow ("crossing", 2, "-t", "-T");
    const int crossings = cl.follow (1, 2, "-c", "-C");
    const double r1 = cl.follow (1.0, 2, "-r1", "-R1");
    const double r2 = cl.follow (1.0, 2, "-r2", "-R2");
    
    int sizex = cl.follow (16, 2, "-x", "-X");
    int sizey = cl.follow (16, 2, "-y", "-Y");
    int sizez = cl.follow (16, 2, "-z", "-Z");

    double spacingx = cl.follow (1.0, 2, "-sx", "-SX");
    double spacingy = cl.follow (1.0, 2, "-sy", "-SY");
    double spacingz = cl.follow (1.0, 2, "-sz", "-SZ");
    
    double originx = cl.follow (0, 2, "-ox", "-OX");
    double originy = cl.follow (0, 2, "-oy", "-OY");
    double originz = cl.follow (0, 2, "-oz", "-OZ");
    
    
    using TensorIOType             = itk::TensorImageIO<double, 3>;
    using TensorImageType          = TensorIOType::TensorImageType;
    using CrossingTensorSourceType = itk::CrossingTensorImageSource<TensorImageType>;
    using CircleTensorSourceType   = itk::CircleTensorImageSource<TensorImageType>;
    
    TensorImageType::PointType   origin;
    TensorImageType::SpacingType spacing;
    TensorImageType::SizeType    size;
    
    origin[0] = originx;
    origin[1] = originy;
    origin[2] = originz;
    
    spacing[0] = spacingx;
    spacing[1] = spacingy;
    spacing[2] = spacingz;
    
    size[0] = sizex;
    size[1] = sizey;
    size[2] = sizez; 
    
    
    TensorImageType::Pointer tensorImage = nullptr;
    
    if( strcmp (type, "crossing")==0 )
    {
      CrossingTensorSourceType::Pointer mySource = CrossingTensorSourceType::New();
      mySource->SetNumberOfCrossings ( crossings );
      mySource->SetOrigin ( origin );
      mySource->SetSpacing ( spacing );
      mySource->SetSize ( size );
      mySource->SetRadius (r1);
      try
      {
	mySource->Update();
      }
      catch (itk::ExceptionObject &e)
      {
	std::cerr << e;
	return -1;
      }
      
      tensorImage = mySource->GetOutput();
      
    }
    else if ( strcmp (type, "circle")==0 )
    {
      CircleTensorSourceType::Pointer mySource = CircleTensorSourceType::New();
      mySource->SetRadius1 ( r1 );
      mySource->SetRadius2 ( r2 );
      try
      {
	mySource->Update();
      }
      catch (itk::ExceptionObject &e)
      {
	std::cerr << e;
	return -1;
      }
      
      tensorImage = mySource->GetOutput();
    }
    else
    {
      std::cerr << "Error: type " << type << " is not recognized." << std::endl;
      return -1;
    }
    
    
    
    TensorIOType::Pointer myIO = TensorIOType::New();
    myIO->SetInput ( tensorImage );
    myIO->SetFileName(output);
    
    try
    {
      myIO->Write();
    }
    catch (itk::ExceptionObject &e)
    {
      std::cerr << e;
      return -1;
    }
    
    
    return 0;
    
  }
  
}