import os
from POULibrary import POULibrary
from PythonFileCTNMixin import PythonFileCTNMixin

class PythonLibrary(POULibrary):
    def GetLibraryPath(self):
        return os.path.join(os.path.split(__file__)[0], "pous.xml") 

    def Generate_C(self, buildpath, varlist, IECCFLAGS):
        
        plc_python_filepath = os.path.join(os.path.split(__file__)[0], "plc_python.c")
        plc_python_file = open(plc_python_filepath, 'r')
        plc_python_code = plc_python_file.read()
        plc_python_file.close()
        python_eval_fb_list = []
        for v in varlist:
            if v["vartype"] == "FB" and v["type"] in ["PYTHON_EVAL","PYTHON_POLL"]:
                python_eval_fb_list.append(v)
        python_eval_fb_count = max(1, len(python_eval_fb_list))
        
        # prepare python code
        plc_python_code = plc_python_code % { "python_eval_fb_count": python_eval_fb_count }
        
        Gen_Pythonfile_path = os.path.join(buildpath, "py_ext.c")
        pythonfile = open(Gen_Pythonfile_path,'w')
        pythonfile.write(plc_python_code)
        pythonfile.close()
        
        return (["py_ext"], [(Gen_Pythonfile_path, IECCFLAGS)], True), ""

class PythonFile(PythonFileCTNMixin):
    
    def GetIconName(self):
        return "Pyfile"
    
    def CTNGenerate_C(self, buildpath, locations):
        current_location = self.GetCurrentLocation()
        # define a unique name for the generated C file
        location_str = "_".join(map(lambda x:str(x), current_location))
        
        sections_code = self.GetSectionsCode()
        
        text = "## Code generated by Beremiz python mixin confnode\n\n"
        
        # Adding variables
        text += "## User variables reference\n"
        text += sections_code["variables"]
        text += "\n"
        
        # Adding user global variables and routines
        text += "## User internal user variables and routines\n"
        text += sections_code["globals"]
        text += "\n"
        
        # Adding Beremiz python runtime functions
        text += "## Beremiz python runtime functions\n"
        for section in self.SECTIONS_NAMES:
            if section != "globals":
                code_object = getattr(self.CodeFile, section)
                text += "def _runtime_%s_%s():\n" % (location_str, section)
                section_code = sections_code.get(section)
                if section_code:
                    text += section_code
                else:
                    text += "    pass\n\n"
        
        runtimefile_path = os.path.join(buildpath, "runtime_%s.py"%location_str)
        runtimefile = open(runtimefile_path, 'w')
        runtimefile.write(text)
        runtimefile.close()
        
        return [], "", False, ("runtime_%s.py"%location_str, file(runtimefile_path,"rb"))