################################################################################
#
# \file      cmake/FindLNetCDF.cmake
# \copyright 2012-2015 J. Bakosi,
#            2016-2018 Los Alamos National Security, LLC.,
#            2019-2021 Triad National Security, LLC.
#            All rights reserved. See the LICENSE file for details.
# \brief     Find NetCDF
#
################################################################################

# NetCDF: https://www.unidata.ucar.edu/software/netcdf
#
#  NETCDF_INCLUDES     - where to find netcdf.h, etc
#  NETCDF_LIBRARIES    - Link these libraries when using NetCDF
#  NETCDF_LIBRARY_DIRS - location of the NetCDF libraries
#  NETCDF_FOUND        - True if NetCDF found including required interfaces (see below)
#
# Your package can require certain interfaces to be FOUND by setting these
#
#  NETCDF_CXX         - require the C++ interface and link the C++ library
#  NETCDF_F77         - require the F77 interface and link the fortran library
#  NETCDF_F90         - require the F90 interface and link the fortran library
#
# The following are not for general use and are included in
# NETCDF_LIBRARIES if the corresponding option above is set.
#
#  NETCDF_LIBRARIES_C    - Just the C interface
#  NETCDF_LIBRARIES_CXX  - C++ interface, if available
#  NETCDF_LIBRARIES_F77  - Fortran 77 interface, if available
#  NETCDF_LIBRARIES_F90  - Fortran 90 interface, if available
#
# Normal usage would be:
#  set (NETCDF_ROOT ${CUSTOM_PATH})
#  set (NETCDF_F90 "YES")
#  find_package (NetCDF REQUIRED)
#  target_link_libraries (uses_f90_interface ${NETCDF_LIBRARIES})
#  target_link_libraries (only_uses_c_interface ${NETCDF_LIBRARIES_C})

# If already in cache, be silent
if (NETCDF_INCLUDES AND NETCDF_LIBRARIES)
  set (NETCDF_FIND_QUIETLY TRUE)
endif (NETCDF_INCLUDES AND NETCDF_LIBRARIES)

find_path (NETCDF_INCLUDES netcdf.h
           HINTS ${NETCDF_ROOT}
                 ${NETCDF_DIR}
                 $ENV{NETCDF_DIR}
                 ${CMAKE_INSTALL_PREFIX}
                 /usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}/netcdf/mpi
            PATH_SUFFIXES include)

find_library (NETCDF_LIBRARIES_C NAMES netcdf
              HINTS ${NETCDF_ROOT}
                    ${NETCDF_DIR}
                    $ENV{NETCDF_DIR}
                    ${CMAKE_INSTALL_PREFIX}
                    /usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}/netcdf/mpi
              PATH_SUFFIXES lib lib64)
mark_as_advanced(NETCDF_LIBRARIES_C)

set (NetCDF_has_interfaces "YES") # will be set to NO if we're missing any interfaces
set (NetCDF_libs "${NETCDF_LIBRARIES_C}")

get_filename_component (NETCDF_LIBRARY_DIRS "${NETCDF_LIBRARIES_C}" PATH)
mark_as_advanced(NETCDF_LIBRARY_DIRS)

macro (NetCDF_check_interface lang header libs)
  if (NETCDF_${lang})
    find_path (NETCDF_INCLUDES_${lang} NAMES ${header}
      HINTS "${NETCDF_INCLUDES}" NO_DEFAULT_PATH)
    find_library (NETCDF_LIBRARIES_${lang} NAMES ${libs}
      HINTS "${NETCDF_LIBRARY_DIRS}" NO_DEFAULT_PATH)
    mark_as_advanced (NETCDF_INCLUDES_${lang} NETCDF_LIBRARIES_${lang})
    if (NETCDF_INCLUDES_${lang} AND NETCDF_LIBRARIES_${lang})
      list (INSERT NetCDF_libs 0 ${NETCDF_LIBRARIES_${lang}}) # prepend so that -lnetcdf is last
    else (NETCDF_INCLUDES_${lang} AND NETCDF_LIBRARIES_${lang})
      set (NetCDF_has_interfaces "NO")
      message (STATUS "Failed to find NetCDF interface for ${lang}")
    endif (NETCDF_INCLUDES_${lang} AND NETCDF_LIBRARIES_${lang})
  endif (NETCDF_${lang})
endmacro (NetCDF_check_interface)

NetCDF_check_interface (CXX netcdfcpp.h netcdf_c++)
NetCDF_check_interface (F77 netcdf.inc  netcdff)
NetCDF_check_interface (F90 netcdf.mod  netcdff)

set (NETCDF_LIBRARIES ${NetCDF_libs})

# handle the QUIETLY and REQUIRED arguments and set NETCDF_FOUND to TRUE if
# all listed variables are TRUE
include (FindPackageHandleStandardArgs)
find_package_handle_standard_args (NetCDF DEFAULT_MSG NETCDF_LIBRARIES NETCDF_INCLUDES NetCDF_has_interfaces)

mark_as_advanced (NETCDF_LIBRARIES NETCDF_INCLUDES)