#!-------------------------------------------------------------------------------------------------!
#!   CP2K: A general program to perform molecular dynamics simulations                             !
#!   Copyright 2000-2026 CP2K developers group <https://cp2k.org>                                  !
#!                                                                                                 !
#!   SPDX-License-Identifier: GPL-2.0-or-later                                                     !
#!-------------------------------------------------------------------------------------------------!

# Copyright (c) 2022- ETH Zurich
#
# authors : Mathieu Taillefumier

include(FindPackageHandleStandardArgs)
include(CheckSymbolExists)
include(cp2k_utils)

find_package(PkgConfig REQUIRED)

cp2k_set_default_paths(LIBVDWXC "LibVDWXC")

pkg_search_module(CP2K_LIBVDWXC libvdwxc>=${LibVDWXC_FIND_VERSION})

if(NOT CP2K_LIBVDWXC_FOUND)
  cp2k_find_libraries(LIBVDWXC "vdwxc")
endif()

if(NOT DEFINED CP2K_LIBVDWXC_INCLUDE_DIRS)
  cp2k_include_dirs(LIBVDWXC "vdwxc.h;vdwxc_mpi.h")
endif()

# try linking in C (C++ fails because vdwxc_mpi.h includes mpi.h inside extern
# "C"{...})
set(CMAKE_REQUIRED_LIBRARIES "${CP2K_LIBVDWXC_LINK_LIBRARIES}")
check_symbol_exists(vdwxc_init_mpi "${CP2K_LIBVDWXC_INCLUDE_DIRS}/vdwxc_mpi.h"
                    HAVE_LIBVDW_WITH_MPI)

find_package_handle_standard_args(
  LibVDWXC DEFAULT_MSG CP2K_LIBVDWXC_LINK_LIBRARIES CP2K_LIBVDWXC_INCLUDE_DIRS)

if(LibVDWXC_FOUND AND NOT TARGET cp2k::libvdwxc::libvdwxc)
  add_library(cp2k::libvdwxc::libvdwxc INTERFACE IMPORTED)
  set_target_properties(
    cp2k::libvdwxc::libvdwxc
    PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${CP2K_LIBVDWXC_INCLUDE_DIRS}"
               INTERFACE_LINK_LIBRARIES "${CP2K_LIBVDWXC_LINK_LIBRARIES}")
endif()

mark_as_advanced(CP2K_LIBVDWXC_INCLUDE_DIRS CP2K_LIBVDWXC_LINK_LIBRARIES
                 CP2K_LIBVDWXC_FOUND)