# Sketch - A Python-based interactive drawing program
# Copyright (C) 1998, 1999, 2000, 2002 by Bernhard Herzog
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library 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

from types import ListType

from Sketch import _
from Sketch.const import SCRIPT_UNDO, SCRIPT_GET, SCRIPT_OBJECT, \
     SCRIPT_OBJECTLIST, SelectSet
from Sketch.warn import warn, USER

class UndoMethodWrapper:

    def __init__(self, method, document):
	self.method = method
	self.document = document

    def __call__(self, *args, **kw):
	self.document.AddUndo(apply(self.method, args, kw))

class ObjectMethodWrapper:

    def __init__(self, method, document):
	self.method = method
	self.document = document

    def __call__(self, *args, **kw):
	return ObjectWrapper(apply(self.method, args, kw), self.document)

class ObjectListMethodWrapper:

    def __init__(self, method, document):
	self.method = method
	self.document = document

    def __call__(self, *args, **kw):
	objects = apply(self.method, args, kw)
	return map(ObjectWrapper, objects, (self.document,) * len(objects))


# special methods (__*__) which can be called safely
safe_special_methods = {
    "__eq__": 1,
    "__lt__": 1,
    "__gt__": 1,
    "__cmp__": 1,
    "__repr__": 1,
    "__str__": 1,
    "__coerce__": 1,
    }
    
class Wrapper:

    def __init__(self, object, document):
	self._object = object
	self._document = document

    def __getattr__(self, attr):
        try:
            access = self._object.script_access[attr]
        except KeyError:
            if not safe_special_methods.get(attr):
                warn(USER,'Cant access attribute %s of %s in safe user script',
                     attr, self._object)
            raise AttributeError, attr
	if access == SCRIPT_UNDO:
	    return UndoMethodWrapper(getattr(self._object, attr),
				     self._document)
	elif access == SCRIPT_GET:
	    return getattr(self._object, attr)
	elif access == SCRIPT_OBJECT:
	    return ObjectMethodWrapper(getattr(self._object, attr),
				       self._document)
	elif access == SCRIPT_OBJECTLIST:
	    return ObjectListMethodWrapper(getattr(self._object, attr),
					   self._document)
	else:
	    raise AttributeError, attr

    def __cmp__(self, other):
        return cmp(self._object, strip_wrapper(other))

def strip_wrapper(wrapped):
    if isinstance(wrapped, Wrapper):
        return wrapped._object
    else:
        return object


class DocumentWrapper(Wrapper):

    def __init__(self, document):
	Wrapper.__init__(self, document, document)

    def SelectObject(self, objects, mode = SelectSet):
	if type(objects) == ListType:
	    objects = map(strip_wrapper, objects)
	else:
	    objects = strip_wrapper(objects)
	self._document.SelectObject(objects, mode)

    def DeselectObject(self, object):
        self._document.DeselectObject(strip_wrapper(object))

    def Insert(self, object, undo_text = _("Create Object")):
        self._document(strip_wrapper(object), undo_text)

                


#

ObjectWrapper = Wrapper