IF (RBDL_USE_PYTHON_2)
  FIND_PROGRAM ( PYTHON "python2" )
  SET (Python_ADDITIONAL_VERSIONS 2.7)
  INCLUDE ( FindNumPy2 )
  MESSAGE(STATUS ${PYTHON_NUMPY_2_INCLUDE_DIR})
  SET( PYTHON_BIN python2)
ELSE(RBDL_USE_PYTHON_2)
  FIND_PROGRAM ( PYTHON "python3" )
  SET (Python_ADDITIONAL_VERSIONS 3.7)
  INCLUDE ( FindNumPy3 )
  MESSAGE(STATUS ${PYTHON_NUMPY_3_INCLUDE_DIR})
  SET( PYTHON_BIN python3)
ENDIF (RBDL_USE_PYTHON_2)

INCLUDE ( UseCython )


FILE( COPY "crbdl.pxd" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")

CONFIGURE_FILE (
  ${CMAKE_CURRENT_SOURCE_DIR}/setup.py.cmake
  ${CMAKE_CURRENT_BINARY_DIR}/setup.py
  )

# Process the rbdl-wrapper.pyx to generate rbdl.pyx BEFORE build time
# else cython_add_module will complain on configuration
EXECUTE_PROCESS ( 
  OUTPUT_VARIABLE WRAPPERGEN_OUT
  COMMAND ${PYTHON_BIN} 
  ${CMAKE_CURRENT_SOURCE_DIR}/wrappergen.py
  ${CMAKE_CURRENT_SOURCE_DIR}/rbdl-wrapper.pyx 
  ${CMAKE_CURRENT_BINARY_DIR}/rbdl.pyx
)
MESSAGE (STATUS ${WRAPPERGEN_OUT})


# Enable C++11 (or C++0x for older compilers)
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
elseif(COMPILER_SUPPORTS_CXX0X)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
else()
        message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()

# If the pyx file is a C++ file, we should specify that here.
set_source_files_properties( ${CMAKE_CURRENT_BINARY_DIR}/rbdl.pyx PROPERTIES CYTHON_IS_CXX TRUE )

# Multi-file cython modules do not appear to be working at the moment.
# NOTE there is some directory property problem in UseCython when build
#      from CMAKE_CURRENT_BINARY_DIR
cython_add_module( rbdl-python ${CMAKE_CURRENT_BINARY_DIR}/rbdl.pyx )

#SET_TARGET_PROPERTIES ( rbdl-python PROPERTIES PREFIX "")
SET_TARGET_PROPERTIES ( rbdl-python PROPERTIES OUTPUT_NAME "rbdl")

IF (RBDL_USE_PYTHON_2)
  INCLUDE_DIRECTORIES (
    ${PROJECT_SOURCE_DIR}/include
    ${PROJECT_SOURCE_DIR}/python
    ${PROJECT_SOURCE_DIR}
    ${PYTHON_NUMPY_2_INCLUDE_DIR}
  )
ELSE(RBDL_USE_PYTHON_2)
  INCLUDE_DIRECTORIES (
    ${PROJECT_SOURCE_DIR}/include
    ${PROJECT_SOURCE_DIR}/python
    ${PROJECT_SOURCE_DIR}
    ${PYTHON_NUMPY_3_INCLUDE_DIR}
  )
ENDIF (RBDL_USE_PYTHON_2)

TARGET_LINK_LIBRARIES (rbdl-python rbdl )

IF (RBDL_BUILD_ADDON_LUAMODEL)
  TARGET_LINK_LIBRARIES (rbdl-python rbdl_luamodel )
ENDIF()

IF (RBDL_BUILD_ADDON_URDFREADER)
  TARGET_LINK_LIBRARIES (rbdl-python rbdl_urdfreader )
ENDIF()

INSTALL ( CODE "EXECUTE_PROCESS(WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR} COMMAND ${PYTHON_BIN} setup.py install)")