#
# @file CMakeLists.txt
#
# @brief Principal CMake configuration file for the fft library
#
# @copyright
# Copyright (©) 2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
# SPC (Swiss Plasma Center)
#
# SPClibs is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# SPClibs is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
# @authors
# (in alphabetical order)
# @author Nicolas Richart <nicolas.richart@epfl.ch>
# @author Trach-Minh Tran <trach-minh.tran@epfl.ch>
#
project(fft)

find_package(FFTW REQUIRED)
set(fft_w $ENV{fft_w})

set(SRCS
  fft_fftw.F90
)

set(EXAMPLES tfft.f90)

add_library(fft STATIC ${SRCS})

target_include_directories(fft
  PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
          ${FFTW_INCLUDES}
  INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
            ${FFTW_INCLUDES}
  )

if (${fft_w} MATCHES "fft_w2")
  target_compile_options(fft PRIVATE "-Dfft_w2")
else()
  target_compile_options(fft PRIVATE "-Dfft_w3")
endif()

target_link_libraries(fft PUBLIC ${FFTW_LIBRARY} ${MPI_Fortran_LIBRARIES})
#
set_property(TARGET fft
  PROPERTY PUBLIC_HEADER ${CMAKE_CURRENT_BINARY_DIR}/modules/fft.mod)

add_executable(tfft tfft.f90)
target_link_libraries(tfft fft ${MPI_Fortran_LIBRARIES})

#add_test(tfft ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} 1
#  ${CMAKE_CURRENT_BINARY_DIR}/tfft < ${fft_SOURCE_DIR}/in)

install(TARGETS fft
  EXPORT ${BSPLINES_EXPORT_TARGETS}
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
)