# ***************************************************************************
# *   Copyright (c) 2017 Markus Hovorka <m.hovorka@live.de>                 *
# *   Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org>              *
# *                                                                         *
# *   This file is part of the FreeCAD CAx development system.              *
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# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
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# *   GNU Library General Public License for more details.                  *
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__title__ = "FreeCAD FEM base python object"
__author__ = "Markus Hovorka, Bernd Hahnebach"
__url__ = "https://www.freecad.org"

## @package base_fempythonobject
#  \ingroup FEM
#  \brief base object for FEM Python Features


class BaseFemPythonObject:

    BaseType = "Fem::BaseFemPythonObject"

    def __init__(self, obj):
        # self.Object = obj  # keep a ref to the DocObj for nonGui usage
        obj.Proxy = self  # link between App::DocumentObject to this object

    # they are needed, see:
    # https://forum.freecad.org/viewtopic.php?f=18&t=44021
    # https://forum.freecad.org/viewtopic.php?f=18&t=44009
    def dumps(self):
        return None

    def loads(self, state):
        return None


class _PropHelper:
    """
    Helper class to manage property data inside proxy objects.
    Initialization keywords are the same used with PropertyContainer
    to add dynamics properties plus "value" for the initial value.
    """

    def __init__(self, **kwds):
        self.value = kwds.pop("value")
        self.info = kwds
        self.name = kwds["name"]

    def add_to_object(self, obj):
        obj.addProperty(**self.info)
        obj.setPropertyStatus(self.name, "LockDynamic")
        setattr(obj, self.name, self.value)

    def handle_change_type(self, obj, old_type, convert_old_value=lambda x: x):
        if obj.getTypeIdOfProperty(self.name) == old_type:
            new_value = convert_old_value(obj.getPropertyByName(self.name))
            obj.setPropertyStatus(self.name, "-LockDynamic")
            obj.removeProperty(self.name)
            self.add_to_object(obj)
            setattr(obj, self.name, new_value)
