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

   Library: iMSTK

   Copyright (c) Kitware, Inc. & Center for Modeling, Simulation,
   & Imaging in Medicine, Rensselaer Polytechnic Institute.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

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

#ifndef imstkVTKMeshIO_h
#define imstkVTKMeshIO_h

#include <memory>

#include "vtkUnstructuredGrid.h"
#include "vtkPolyData.h"
#include "vtkPoints.h"
#include "vtkCellArray.h"
#include "vtkPointData.h"

#include "imstkMeshIO.h"
#include "imstkSurfaceMesh.h"
#include "imstkTetrahedralMesh.h"
#include "imstkHexahedralMesh.h"

namespace imstk
{

///
/// \class VTKMeshIO
///
/// \brief
///
class VTKMeshIO
{
public:

    ///
    /// \brief Default constructor
    ///
    VTKMeshIO() = default;

    ///
    /// \brief Default destructor
    ///
    ~VTKMeshIO() = default;

    ///
    /// \brief
    ///
    static std::shared_ptr<Mesh> read(const std::string& filePath, MeshFileType meshType);

    ///
    /// \brief Writes the given mesh to the specified file path.
    ///
    static bool write(const std::shared_ptr<Mesh> imstkMesh, const std::string& filePath, const MeshFileType meshType);

protected:

    ///
    /// \brief
    ///
    template<typename ReaderType>
    static std::shared_ptr<Mesh> readVtkGenericFormatData(const std::string& filePath);

    ///
    /// \brief
    ///
    template<typename ReaderType>
    static std::shared_ptr<SurfaceMesh> readVtkPolyData(const std::string& filePath);

    ///
    /// \brief Writes the given surfase mesh to given file path using the provided writer type
    ///
    template<typename WriterType>
    static bool writeVtkPolyData(const std::shared_ptr<SurfaceMesh> imstkMesh, const std::string& filePath);

    ///
    /// \brief Writes the given volumetric mesh to given file path
    ///
    static bool writeVtkUnstructuredGrid(const std::shared_ptr<VolumetricMesh> imstkMesh, const std::string& filePath);

    ///
    /// \brief
    ///
    template<typename ReaderType>
    static std::shared_ptr<VolumetricMesh> readVtkUnstructuredGrid(const std::string& filePath);

    ///
    /// \brief
    ///
    static std::shared_ptr<SurfaceMesh> convertVtkPolyDataToSurfaceMesh(vtkPolyData* vtkMesh);

    ///
    /// \brief Converts imstk surface mesh into a vtk polydata suitable for writing to file
    ///
    static vtkPolyData* convertSurfaceMeshToVtkPolyData(std::shared_ptr<SurfaceMesh> imstkMesh);

    ///
    /// \brief Converts imstk tetrahedral mesh into a vtk unstructured grid suitable for writing to file
    ///
    static vtkUnstructuredGrid* convertTetrahedralMeshToVtkUnstructuredGrid(std::shared_ptr<TetrahedralMesh> imstkMesh);

    ///
    /// \brief Converts imstk hexahedral mesh into a vtk unstructured grid suitable for writing to file
    ///
    static vtkUnstructuredGrid * convertHexahedralMeshToVtkUnstructuredGrid(std::shared_ptr<HexahedralMesh> imstkMesh);

    ///
    /// \brief
    ///
    static std::shared_ptr<VolumetricMesh> convertVtkUnstructuredGridToVolumetricMesh(vtkUnstructuredGrid* vtkMesh);

    ///
    /// \brief
    ///
    static void copyVerticesFromVtk(vtkPoints* points, StdVectorOfVec3d& vertices);

    ///
    /// \brief Copies vertices from imstk structure to VTK one
    ///
    static void copyVerticesToVtk(const StdVectorOfVec3d& vertices, vtkPoints* points);

    ///
    /// \brief Copies cells of the given dimension from imstk structure to VTK one
    ///
    template<size_t dim>
    static void copyCellsToVtk(const std::vector<std::array<size_t, dim>>& cells, vtkCellArray* vtkCells);

    ///
    /// \brief
    ///
    template<size_t dim>
    static void copyCellsFromVtk(vtkCellArray* vtkCells, std::vector<std::array<size_t,dim>>& cells);

    ///
    /// \brief
    ///
    static void copyPointData(vtkPointData* pointData, std::map<std::string, StdVectorOfVectorf>& dataMap);

};

} // imstk

#endif // ifndef imstkVTKMeshIO_h