// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-FileCopyrightText: Copyright (c) Sandia Corporation
// SPDX-FileCopyrightText: Copyright (c) 2018 Niklas Roeber, DKRZ Hamburg
// SPDX-License-Identifier: BSD-3-Clause

#include "cdi_tools.h"
#include "vtk_netcdf.h"
#include "vtksys/SystemTools.hxx"

#include <cstring>

//----------------------------------------------------------------------------
std::string get_att_str(const std::string& filename, const std::string& var, const std::string& att)
{
  std::string result;

  int ncFD;
  nc_open(filename.c_str(), NC_NOWRITE, &ncFD);
  int status = NC_NOERR, varId;
  size_t len;
  if (var == "NC_GLOBAL")
  {
    varId = NC_GLOBAL;
  }
  else
  {
    status = nc_inq_varid(ncFD, var.c_str(), &varId);
    if (status != NC_NOERR)
      return result;
  }
  status = nc_inq_attlen(ncFD, varId, att.c_str(), &len);
  if (status != NC_NOERR)
    return result;
  char* buffer = new char[len + 1];
  status = nc_get_att_text(ncFD, varId, att.c_str(), buffer);
  if (status != NC_NOERR)
    return result;
  buffer[len] = 0;
  result = buffer;
  delete[] buffer;
  return result;
}

namespace cdi_tools
{
//----------------------------------------------------------------------------
std::string GuessGridFileFromUri(const std::string& FileName)
{
  std::string guess;
  // NETCDF-CALL:
  std::string uri_filename =
    vtksys::SystemTools::GetFilenameName(::get_att_str(FileName, "NC_GLOBAL", "grid_file_uri"));
  if (!uri_filename.empty())
  {
    std::string dir = vtksys::SystemTools::GetParentDirectory(FileName);
    // guess = vtksys::SystemTools::JoinPath({dir, uri_filename});
    guess = dir + "/" + uri_filename;
  }
  return guess;
}

//----------------------------------------------------------------------------
std::string ParseTimeUnits(const int& vdate, const int& vtime)
{
  std::string date = std::to_string(vdate);
  std::string time = std::to_string(vtime);
  std::string time_units;
  if (date.size() < 8)
  {
    time_units = "days since 0-1-1 ";
  }
  else
  {
    time_units = "days since ";
    time_units += date.substr(0, 4);
    time_units += "-";
    time_units += date.substr(4, 2);
    time_units += "-";
    time_units += date.substr(6, 2);
    time_units += " ";
  }
  if (time.size() < 6)
  {
    time_units += "00:00:00";
  }
  else
  {
    time_units += time.substr(0, 2);
    time_units += ":";
    time_units += time.substr(2, 2);
    time_units += ":";
    time_units += time.substr(4, 2);
  }
  return time_units;
}

//----------------------------------------------------------------------------
std::string ParseCalendar(const int& calendar)
{
  std::string calendar_name;
  switch (calendar)
  {
    case CALENDAR_STANDARD:
      calendar_name = "standard";
      break;
    case CALENDAR_GREGORIAN:
      calendar_name = "gregorian";
      break;
    case CALENDAR_PROLEPTIC:
      calendar_name = "proleptic_gregorian";
      break;
    case CALENDAR_NONE:
      calendar_name = "none";
      break;
    case CALENDAR_360DAYS:
      calendar_name = "360_day";
      break;
    case CALENDAR_365DAYS:
      calendar_name = "365_day";
      break;
    case CALENDAR_366DAYS:
      calendar_name = "366_day";
      break;
  }
  return calendar_name;
}

//----------------------------------------------------------------------------
//  CDI helper functions
//----------------------------------------------------------------------------
void cdi_set_cur(CDIVar* cdiVar, int Timestep, int level)
{
  cdiVar->Timestep = Timestep;
  cdiVar->LevelID = level;
}

void readslice(int streamID, int varID, int levelID, double data[], SizeType* nmiss)
{
  streamReadVarSlice(streamID, varID, levelID, data, nmiss);
}
void readslice(int streamID, int varID, int levelID, float data[], SizeType* nmiss)
{
  streamReadVarSliceF(streamID, varID, levelID, data, nmiss);
}
void readvar(int streamID, int varID, double data[], SizeType* nmiss)
{
  streamReadVar(streamID, varID, data, nmiss);
}
void readvar(int streamID, int varID, float data[], SizeType* nmiss)
{
  streamReadVarF(streamID, varID, data, nmiss);
}

}; // end of namespace cdi_tools
