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import os

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from POULibrary import POULibrary

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from PythonFileCTNMixin import PythonFileCTNMixin

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class PythonLibrary(POULibrary):

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    def GetLibraryPath(self):

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        return os.path.join(os.path.split(__file__)[0], "pous.xml") 

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    def Generate_C(self, buildpath, varlist, IECCFLAGS):

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        plc_python_filepath = os.path.join(os.path.split(__file__)[0], "plc_python.c")

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        plc_python_file = open(plc_python_filepath, 'r')

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        plc_python_code = plc_python_file.read()

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        plc_python_file.close()

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        python_eval_fb_list = []

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        for v in varlist:

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            if v["vartype"] == "FB" and v["type"] in ["PYTHON_EVAL","PYTHON_POLL"]:

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                python_eval_fb_list.append(v)

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        python_eval_fb_count = max(1, len(python_eval_fb_list))

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        # prepare python code

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        plc_python_code = plc_python_code % { "python_eval_fb_count": python_eval_fb_count }

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        Gen_Pythonfile_path = os.path.join(buildpath, "py_ext.c")

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        pythonfile = open(Gen_Pythonfile_path,'w')

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        pythonfile.write(plc_python_code)

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        pythonfile.close()

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        return (["py_ext"], [(Gen_Pythonfile_path, IECCFLAGS)], True), ""

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class PythonFile(PythonFileCTNMixin):

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    def CTNGenerate_C(self, buildpath, locations):

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        current_location = self.GetCurrentLocation()

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        # define a unique name for the generated C file

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        location_str = "_".join(map(lambda x:str(x), current_location))

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        runtimefile_path = os.path.join(buildpath, "runtime_%s.py"%location_str)

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        runtimefile = open(runtimefile_path, 'w')

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        runtimefile.write(self.GetPythonCode())

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        runtimefile.close()

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        return [], "", False, ("runtime_%s.py"%location_str, file(runtimefile_path,"rb"))

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