/*!
   \file netCdfInterface.hpp
   \author Ha NGUYEN
   \date 08 Oct 2014
   \since 03 Oct 2014

   \brief Wrapper of netcdf functions.
 */
#ifndef __NETCDF_INTERFACE_HPP_
#define __NETCDF_INTERFACE_HPP_

#include "xios_spl.hpp"

#if !defined(USING_NETCDF_PAR)
#include "exception.hpp"
#endif

#include "mpi.hpp"
#include "netcdf.hpp"

namespace xios
{
  /*!
  \class CNetCdfInterface
   This class is  wrapper of some common used functions of netCdf in Xios
  */
  class CNetCdfInterface
  {
  public:
    //! Create a netcdf file
    static int create(const StdString& path, int cmode, int& ncId);

    //! Create a netcdf file on a parallel file system
    static int createPar(const StdString& path, int cmode, ep_lib::MPI_Comm comm, ep_lib::MPI_Info info, int& ncId);

    //! Open a netcdf file
    static int open(const StdString& path, int oMode, int& ncId);

    //! Open a netcdf file
    static int openPar(const StdString& path, int cmode, ep_lib::MPI_Comm comm, ep_lib::MPI_Info info, int& ncId);

    //! Close a netcdf file
    static int close(int ncId);

    //! Put netcdf file into define mode
    static int reDef(int ncId);

    //! End define mode of a netcdf file
    static int endDef(int ncId);

    //! Query identity of a named group
    static int inqNcId(int ncid, const StdString& grpName, int& grpId);

    //! Query identity of a named variable
    static int inqVarId(int ncid, const StdString& varName, int& varId);

    //! Query the name of a variable given its id
    static int inqVarName(int ncid, int varId, StdString& varName);

    //! Query identity of a named dimension
    static int inqDimId(int ncid, const StdString& dimName, int& dimId);

    //! Query identity of unlimited dimension
    static int inqUnLimDim(int ncid, int& dimId);

    //! Query name of a dimension with its id
    static int inqDimName(int ncid, int dimId, StdString& dimName);

    //! Query length of dimension with its id
    static int inqDimLen(int ncid, int dimId, StdSize& dimLen);

    //! Query number of dimension of a variable with its id
    static int inqVarNDims(int ncid, int varId, int& nDims);

    //! Query list of dimension of a variable with its id
    static int inqVarDimId(int, int, int*);

    //! Query dimensions of a group
    static int inqDimIds(int ncid, int& nDims, int* dimIds, int includeParents);

    //! Query the full name of a group given its id
    static int inqGrpFullName(int ncid, StdString& grpFullName);

    //! Query the list of group ids given a location id
    static int inqGrpIds(int ncid, int& numgrps, int* ncids);

    //! Query the list of variable ids given a location id
    static int inqVarIds(int ncid, int& nvars, int* varids);

    //! Query the type and the size of an attribute given its name and the id of the variable to which it is attached.
    static int inqAtt(int ncid, int varid, const StdString& name, nc_type& type, size_t& len);

    //! Query the number of global attributes given a location id
    static int inqNAtts(int ncid, int& ngatts);

    //! Query the number of attributes given a location id and a variable id
    static int inqVarNAtts(int ncid, int varid, int& natts);

    //! Query the name of an attribute given a location id, a variable id and the attribute number
    static int inqAttName(int ncid, int varid, int attnum, StdString& name);

    //! Define a group
    static int defGrp(int parentNcid, const StdString& grpName, int& grpId);

    //! Define a dimension
    static int defDim(int ncid, const StdString& dimName, StdSize dimLen, int& dimId);

    //! Define a variable
    static int defVar(int ncid, const StdString& varName, nc_type xtype,
                      int nDims, const int dimIds[], int& varId);

    //! Define variable chunking size
    static int defVarChunking(int ncid, int varId, int storage, StdSize chunkSize[]);

    //! Define variable compression level
    static int defVarDeflate(int ncid, int varId, int compressionLevel);

    //! Set or unset the fill mode
    static int setFill(int ncid, bool fill);

    //! Define variable fill parameters
    static int defVarFill(int ncid, int varId, int noFill, void* fillValue);


    //! Change access type of a variable
    static int varParAccess(int ncid, int varid, int access);

    //! Sync the file
    static int sync(int ncId);

    //! Read an attribute
    template<typename T>
    static int getAttType(int ncid, int varid, const StdString& attrName, T* data);

    //! Set an attribute
    template<typename T>
    static int putAttType(int ncid, int varid, const StdString& attrName, StdSize numVal, const T* data);

    //! Get data for a variable
    template<typename T>
    static int getVaraType(int ncid, int varid, const StdSize* start, const StdSize* count, T* data);

    //! Set data for a variable
    template<typename T>
    static int putVaraType(int ncid, int varid, const StdSize* start, const StdSize* count, const T* data);

    //! Get the NetCDF type corresponding to a specific C type
    template<typename T>
    static nc_type getNcType();

  private:
    template<typename T>
    static int ncGetAttType(int ncid, int varid, const char* attrName, T* data);

    template<typename T>
    static int ncPutAttType(int ncid, int varid, const char* attrName, StdSize numVal, const T* data);

    template<typename T>
    static int ncGetVaraType(int ncid, int varid, const StdSize* start, const StdSize* count, T* data);

    template<typename T>
    static int ncPutVaraType(int ncid, int varid, const StdSize* start, const StdSize* count, const T* data);

  private:
    static StdString openMode2String(int oMode);

    static StdString creationMode2String(int cMode);


  public:
    // Some functions dedude from several special cases
    //! Query the existence of a variable
    static bool isVarExisted(int ncId, const StdString& varName);
    static bool isDimExisted(int ncId, const StdString& dimName);
  };
}


#endif // NETCDFINTERFACE_HPP_