option ( PYTHON_BINDINGS "Build python bindings via swig" ON )

if ( PYTHON_BINDINGS )
  find_package ( SWIG )
  find_package ( PythonLibs )
  find_package ( PythonInterp )
endif ()

if ( SWIG_FOUND AND PYTHONLIBS_FOUND AND PYTHONINTERP_FOUND )
  include ( UseSWIG )
  include_directories ( BEFORE ${CMAKE_SOURCE_DIR}/src )
  include_directories ( ${PYTHON_INCLUDE_DIRS} )
  link_directories ( ${CMAKE_CURRENT_BINARY_DIR}/../src )

  swig_add_module ( ftdi1 python ftdi1.i )
  swig_link_libraries ( ftdi1 ftdi1 )

  # do not link python modules on debian
  # http://www.debian.org/doc/packaging-manuals/python-policy/ch-module_packages.html
  if ( NOT UNIX OR ( UNIX AND NOT EXISTS "/etc/debian_version" ) )
    swig_link_libraries ( ftdi1 ${PYTHON_LIBRARIES} )
  endif ()

  execute_process ( COMMAND ${PYTHON_EXECUTABLE} -c "import sys; print( '%d.%d' % ( sys.version_info[0], sys.version_info[1] ) )"
                    OUTPUT_VARIABLE PYTHON_VERSION
                    OUTPUT_STRIP_TRAILING_WHITESPACE )

  set ( SITEPACKAGE lib${LIB_SUFFIX}/python${PYTHON_VERSION}/site-packages )

  INSTALL ( FILES ${CMAKE_CURRENT_BINARY_DIR}/_ftdi1.so DESTINATION ${SITEPACKAGE} )
  INSTALL ( FILES ${CMAKE_CURRENT_BINARY_DIR}/ftdi1.py DESTINATION ${SITEPACKAGE} )

  if ( DOCUMENTATION AND DOXYGEN_FOUND )

      set(CMAKE_SWIG_FLAGS -DDOXYGEN=${DOXYGEN_FOUND})

      # Run doxygen to only generate the xml
      add_custom_command ( OUTPUT ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
          COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/doc
          COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_BINARY_DIR}/Doxyfile.xml
          WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
          DEPENDS ${c_headers};${c_sources};${cpp_sources};${cpp_headers}
      )

      # generate .i from doxygen .xml
      add_custom_command ( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i
          COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/doxy2swig.py -n
              ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
              ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i
          DEPENDS ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
      )
      add_custom_target ( doc_i DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i )
      add_dependencies( ${SWIG_MODULE_ftdi1_REAL_NAME} doc_i )

  endif ()
  
  set ( LIBFTDI_PYTHON_MODULE_PATH ${CMAKE_INSTALL_PREFIX}/${SITEPACKAGE} )
  set ( LIBFTDI_PYTHON_MODULE_PATH ${LIBFTDI_PYTHON_MODULE_PATH} PARENT_SCOPE ) # for ftdiconfig.cmake
  message(STATUS "Building python bindings via swig. Will be installed under ${LIBFTDI_PYTHON_MODULE_PATH}")

  add_subdirectory ( examples )
else ()
  message(STATUS "Not building python bindings")
endif ()