// ============================================================================
// ==                                                                        ==
// == AMDiS - Adaptive multidimensional simulations                          ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  TU Dresden                                                            ==
// ==                                                                        ==
// ==  Institut für Wissenschaftliches Rechnen                               ==
// ==  Zellescher Weg 12-14                                                  ==
// ==  01069 Dresden                                                         ==
// ==  germany                                                               ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  https://gforge.zih.tu-dresden.de/projects/amdis/                      ==
// ==                                                                        ==
// ============================================================================

/** \file VtkWriter.h */

#ifndef AMDIS_VTKWRITER_H
#define AMDIS_VTKWRITER_H

#ifdef HAVE_BOOST
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/device/file_descriptor.hpp>
#include <boost/iostreams/filter/gzip.hpp>
#include <boost/iostreams/filter/bzip2.hpp>
#endif

#include <fstream>
#include "BasisFunction.h"
#include "DataCollector.h"
#include "FileWriter.h"

namespace AMDiS {

  class VtkWriter
  {
  public:
    VtkWriter(std::vector<DataCollector*> *dc)
      : dataCollector(dc),
	compress(NONE)
    {
      degree = (*dataCollector)[0]->getFeSpace()->getBasisFcts()->getDegree();    
      dim = (*dataCollector)[0]->getMesh()->getDim();
    }  

    /// Writes a ParaView-VTK file.
    int writeFile(std::string name);

    /// Writes a pvtu file, which contains the links to all the rank files.
    void writeParallelFile(std::string name, int nRanks,
			   std::string fnPrefix, std::string fnPostfix);

    /// May be used to simply write ParaView files.
    static void writeFile(DOFVector<double> *values, std::string filename);

    /// Set a compressing method for file output.
    void setCompression(FileCompression c) 
    {
      compress = c;
    }

    /// Adds a new entry to a ParaView animation file.
    int updateAnimationFile(std::string valueFilename,
			    std::vector< std::string > *paraViewAnimationFrames,
			    std::string animationFilename);
  protected:
    /// Writes the VTK file to an arbitrary stream.
    template<typename T>
    void writeFileToStream(T &file);

    /// Writes all coordinates of vertices and interpolation points to an output file.
    template<typename T>
    void writeVertexCoords(T &file);

    /// Writes all values of vertices and interpolation point to an output file.
    template<typename T>
    void writeVertexValues(T &file, int componentNo);

    /// Writes the connectivity of all simplices to an output file.
    template<typename T>
    void writeConnectivity(T &file);

    /// Writes the connectivity for the case dim = 2 and degree = 2 to an output file.
    template<typename T>
    void writeConnectivity_dim2_degree2(T &file);

    /// Writes the connectivity for the case dim = 2 and degree = 3 to an output file.
    template<typename T>
    void writeConnectivity_dim2_degree3(T &file);

    /// Writes the connectivity for the case dim = 2 and degree = 4 to an output file.
    template<typename T>
    void writeConnectivity_dim2_degree4(T &file);

#ifdef HAVE_BOOST
    /// Writes a world coordinate to a given file.
    inline void writeCoord(boost::iostreams::filtering_ostream &file, 
			   WorldVector<double> coord) 
    {
      for (int i = 0; i < Global::getGeo(WORLD); i++)
	file << " " << std::scientific << coord[i];
      for (int i = Global::getGeo(WORLD); i < 3; i++)
	file << " 0.0";

      file << "\n";
    }
#endif

    /// Writes a world coordinate to a given file.
    inline void writeCoord(std::ofstream &file, WorldVector<double> coord) 
    {
      for (int i = 0; i < Global::getGeo(WORLD); i++)
	file << " " << std::scientific << coord[i];
      for (int i = Global::getGeo(WORLD); i < 3; i++)
	file << " 0.0";

      file << "\n";
    }

  private:
    /// List of DataCollectors, for each component of the problem one.
    std::vector<DataCollector*> *dataCollector;

    /** \brief
     * Defines if the file has to be compressed for ouput, and with which
     * kind of compress method.
     */
    FileCompression compress;

    /// Degree of the basis function of the problem.
    int degree;
    
    /// Dimension of the geometry.
    int dim;
  };
}

#include "VtkWriter.hh"

#endif