cmake_minimum_required (VERSION 3.1)
project (Particles)
cmake_policy(VERSION 3.3)

set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")

################################################################
# libpart
################################################################

add_library(part SHARED
  compute_boundary.cc
  compute_verlet_integration.cc
  particle.cc
  planet.cc
  compute_gravity.cc
  csv_reader.cc
  particles_factory_interface.cc
  planets_factory.cc
  compute_contact.cc
  compute_kinetic_energy.cc
  csv_writer.cc
  system.cc
  compute_energy.cc
  compute_potential_energy.cc
  ping_pong_ball.cc
  material_point.cc
  system_evolution.cc
  ping_pong_balls_factory.cc
  compute_interaction.cc
  compute_temperature.cc
  material_points_factory.cc
  )

################################################################
# FFTW
################################################################

option(USE_FFTW "Use fftw library" ON)

if(USE_FFTW)
  add_definitions(-DUSE_FFTW)

  set(FFTW_LIBRARY_PATH CACHE PATH /usr/local/include/) # "library where to search libfftw3"
  find_library(FFTW_LIBRARIES fftw3 ${FFTW_LIBRARY_PATH} /usr/lib/x86_64-linux-gnu/)

  set(FFTW_INCLUDE_PATH CACHE PATH /usr/local/include) # "path where to search fftw include files"
  find_path(FFTW_INCLUDES fftw3.h ${FFTW_INCLUDE_PATH} /usr/include/)

  include_directories(${FFTW_INCLUDES})

  #find_package(FFTW)
  target_link_libraries(part ${FFTW_LIBRARIES})
endif(USE_FFTW)

################################################################
# Particles executable
################################################################

add_executable(particles main.cc)
target_link_libraries(particles part)

################################################################
# Google test
################################################################

add_subdirectory(googletest)

add_executable(test_kepler test_kepler.cc)
target_link_libraries(test_kepler part gtest_main gtest pthread)

if(USE_FFTW)
add_executable(test_fft test_fft.cc)
target_link_libraries(test_fft part gtest_main gtest ${FFTW_LIBRARIES} pthread)
endif(USE_FFTW)

################################################################
# Doxygen
################################################################

# find_package(Doxygen)
# if (DOXYGEN_FOUND)
#
# # to set other options, read: https://cmake.org/cmake/help/v3.9/module/FindDoxygen.html
# doxygen_add_docs(
#     doxygen
#     ${PROJECT_SOURCE_DIR}
#     COMMENT "Generate html pages"
# )
# add_custom_target(doc DEPENDS doxygen)
# endif(DOXYGEN_FOUND)

################################################################
# Pybind
################################################################

option (USE_PYTHON "Use pybind library" ON)

if (USE_PYTHON)
#find_package(pybind11 REQUIRED)
add_subdirectory(pybind11)

add_library(pypart MODULE pypart.cc)
target_link_libraries(pypart PRIVATE pybind11::module part)
set_target_properties(pypart PROPERTIES
  PREFIX "${PYTHON_MODULE_PREFIX}"
  SUFFIX "${PYTHON_MODULE_EXTENSION}"
  )

file(
  COPY ${CMAKE_CURRENT_SOURCE_DIR}/main.py
  DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/
  )

endif(USE_PYTHON)