#  -------------------------------------------------------------------------
#  Author: Roberto Cavada <cavada@irst.itc.it>
#
#  Copyright (C) 2006 by Roberto Cavada
#
#  pygtkmvc is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 2 of the License, or (at your option) any later version.
#
#  pygtkmvc is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#  Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this library; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
#
#  For more information on pygtkmvc see <http://pygtkmvc.sourceforge.net>
#  or email to the author Roberto Cavada <cavada@irst.itc.it>.
#  Please report bugs to <cavada@irst.itc.it>.
#  -------------------------------------------------------------------------


import new


# ----------------------------------------------------------------------
class ObsWrapperBase (object):
    def __init__(self):
        self.__prop_name = None
        self.__gtkmvc_model = None
        return

    def __set_model__(self, model, prop_name):
        self.__prop_name = prop_name
        self.__gtkmvc_model = model
        return

    def __get_prop_name__(self): return self.__prop_name
    def __get_model__(self): return self.__gtkmvc_model

    def _notify_method_before(self, instance, name, args, kwargs):
        self.__get_model__().notify_method_before_change(self.__prop_name,
                                                         instance, 
                                                         name, args, kwargs)
        return

    def _notify_method_after(self, instance, name, res_val, args, kwargs):
        self.__get_model__().notify_method_after_change(self.__prop_name,
                                                        instance, 
                                                        name, res_val, args, kwargs)
        return
    
    pass
    

# ----------------------------------------------------------------------
class ObsWrapper (ObsWrapperBase):

    def __init__(self, obj, method_names):
        ObsWrapperBase.__init__(self)
        
        self._obj = obj
        self.__doc__ = obj.__doc__

        for name in method_names:
            if hasattr(self._obj, name) and not hasattr(self, name):
                src = self.__get_wrapper_code(name)
                exec src
                
                code = eval("%s.func_code" % name)
                func = new.function(code, globals())
                meth = new.instancemethod(func, self, type(self).__name__)
                setattr(self, name, meth)
                pass
            pass

        return

    def __get_wrapper_code(self, name):
        return """def %(name)s(self, *args, **kwargs):
 self._notify_method_before(self._obj, "%(name)s", args, kwargs)
 res = self._obj.%(name)s(*args, **kwargs)
 self._notify_method_after(self._obj, "%(name)s", res, args, kwargs)
 return res""" % {'name' : name}

    # For all fall backs
    def __getattr__(self, name): return self._obj.__getattr__(name)
    def __repr__(self): return self._obj.__repr__()
    def __str__(self): return self._obj.__str__()
    
    pass #end of class


# ----------------------------------------------------------------------
class ObsSeqWrapper (ObsWrapper):
    def __init__(self, obj, method_names):
        ObsWrapper.__init__(self, obj, method_names)
        return

    def __setitem__(self, key, val):
        
        self._notify_method_before(self._obj, "__setitem__", (key,val), {})
        res = self._obj.__setitem__(key, val)
        self._notify_method_after(self._obj, res, "__setitem__", (key,val), {})
        return res

    def __delitem__(self, key):
        self._notify_method_before(self._obj, "__delitem__", (key,), {})
        res = self._obj.__delitem__(key)
        self._notify_method_after(self._obj, res, "__delitem__", (key,), {})
        return res


    def __getitem__(self, key):
        return self._obj.__getitem__(key)

    pass #end of class


# ----------------------------------------------------------------------
class ObsMapWrapper (ObsSeqWrapper):
    def __init__(self, m):
        methods = ("clear", "pop", "popitem", "update",
                   "setdefault")
        ObsSeqWrapper.__init__(self, m, methods)
        return
    pass #end of class


# ----------------------------------------------------------------------
class ObsListWrapper (ObsSeqWrapper):
    def __init__(self, l):
        methods = ("append", "extend", "insert",
                   "pop", "remove", "reverse", "sort")
        ObsSeqWrapper.__init__(self, l, methods)
        return
    pass #end of class



# ----------------------------------------------------------------------
class ObsUserClassWrapper (ObsWrapper):
    def __init__(self, user_class_instance, obs_method_names):
        ObsWrapper.__init__(self, user_class_instance, obs_method_names)
        return
    pass #end of class