from bgenOutput import *
from bgenGeneratorGroup import GeneratorGroup

class Module(GeneratorGroup):

    def __init__(self, name, prefix = None,
             includestuff = None,
             finalstuff = None,
             initstuff = None,
             variablestuff = None,
             longname = None):
        GeneratorGroup.__init__(self, prefix or name)
        self.name = name
        if longname:
            self.longname = longname
        else:
            self.longname = name
        self.includestuff = includestuff
        self.initstuff = initstuff
        self.finalstuff = finalstuff
        self.variablestuff = variablestuff
        self.typeobjects = []

    def addobject(self, od):
        self.generators.append(od)
        self.typeobjects.append(od)
        od.setmodulename(self.longname)

    def generate(self):
        OutHeader1("Module " + self.name)
        Output("#include \"Python.h\"")
        Output()

        if self.includestuff:
            Output()
            Output("%s", self.includestuff)

        self.declareModuleVariables()

        GeneratorGroup.generate(self)

        if self.finalstuff:
            Output()
            Output("%s", self.finalstuff)

        Output()
        Output("void init%s(void)", self.name)
        OutLbrace()
        Output("PyObject *m;")
        Output("PyObject *d;")
        Output()

        if self.initstuff:
            Output("%s", self.initstuff)
            Output()

        Output("m = Py_InitModule(\"%s\", %s_methods);",
               self.name, self.prefix)
        Output("d = PyModule_GetDict(m);")
        self.createModuleVariables()
        OutRbrace()
        OutHeader1("End module " + self.name)

    def declareModuleVariables(self):
        self.errorname = self.prefix + "_Error"
        Output("static PyObject *%s;", self.errorname)

    def createModuleVariables(self):
        Output("""%s = %s;""", self.errorname, self.exceptionInitializer())
        Output("""if (%s == NULL ||""", self.errorname)
        Output("""    PyDict_SetItemString(d, "Error", %s) != 0)""",
                                                       self.errorname)
        IndentLevel()
        Output("""return;""")
        DedentLevel()
        for tp in self.typeobjects:
            tp.outputTypeObjectInitializer()
        if self.variablestuff:
            Output("%s", self.variablestuff)
            Output()

    def exceptionInitializer(self):
        return """PyErr_NewException("%s.Error", NULL, NULL)""" % self.name


def _test():
    from bgenGenerator import FunctionGenerator
    m = Module("spam", "", "#include <stdio.h>")
    g = FunctionGenerator(None, "bacon")
    m.add(g)
    m.generate()

if __name__ == "__main__":
    _test()