# work around wrong python detection script of cmake (happens with old python versions)
if(PYTHON_EXECUTABLE)
    execute_process(COMMAND "${PYTHON_EXECUTABLE}" --version
                    ERROR_VARIABLE _VERSION
                    RESULT_VARIABLE _PYTHON_VERSION_RESULT
                    OUTPUT_QUIET
                    ERROR_STRIP_TRAILING_WHITESPACE)
    if(_PYTHON_VERSION_RESULT)
        execute_process(COMMAND "${PYTHON_EXECUTABLE}" -V
                        ERROR_VARIABLE _VERSION
                        RESULT_VARIABLE _PYTHON_VERSION_RESULT
                        OUTPUT_QUIET
                        ERROR_STRIP_TRAILING_WHITESPACE)
    endif(_PYTHON_VERSION_RESULT)
    if(NOT _PYTHON_VERSION_RESULT AND _VERSION MATCHES "^Python [0-9]+\\.[0-9]+.*")
        string(REPLACE "Python " "" PYTHON_VERSION_STRING "${_VERSION}")
        string(REGEX REPLACE "^([0-9]+)\\.[0-9]+.*" "\\1" PYTHON_VERSION_MAJOR "${PYTHON_VERSION_STRING}")
        string(REGEX REPLACE "^[0-9]+\\.([0-9])+.*" "\\1" PYTHON_VERSION_MINOR "${PYTHON_VERSION_STRING}")
        if(PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+.*")
            string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" PYTHON_VERSION_PATCH "${PYTHON_VERSION_STRING}")
        endif()
    endif()
endif(PYTHON_EXECUTABLE)

if(PYTHON_EXECUTABLE AND NOT PYTHON_VERSION_STRING VERSION_LESS "2.5" )
	#run python to create the wrapper
		add_custom_command(
			OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/tigl3wrapper.py
			DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/make_tigl_python.py ${PROJECT_SOURCE_DIR}/src/api/tigl.h
			WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
			COMMAND ${PYTHON_EXECUTABLE}
			ARGS ${CMAKE_CURRENT_SOURCE_DIR}/make_tigl_python.py
		)

		add_custom_target(tiglPython ALL
			COMMENT "Create python interface for tigl" VERBATIM 
			DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/tigl3wrapper.py
		)
		
		install(FILES ${CMAKE_CURRENT_BINARY_DIR}/tigl3wrapper.py
				DESTINATION ${PYTHON_SITE_PACKAGES}/tigl3
				COMPONENT interfaces)
else()
    message(ERROR "Python could not be found or the python installation is too old ( < 2.5). Python bindings can not be build!")
endif()