#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2002-2006  Donald N. Allingham
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id$

#-------------------------------------------------------------------------
#
# Standard Python modules
#
#-------------------------------------------------------------------------
from ....const import GRAMPS_LOCALE as glocale
_ = glocale.translation.gettext

#-------------------------------------------------------------------------
#
# GRAMPS modules
#
#-------------------------------------------------------------------------
from .. import Rule

#-------------------------------------------------------------------------
#
# IsLessThanNthGenerationDescendantOf
#
#-------------------------------------------------------------------------
class IsLessThanNthGenerationDescendantOf(Rule):
    """Rule that checks for a person that is a descendant of a specified person
    not more than N generations away"""

    labels      = [ _('ID:'), _('Number of generations:') ]
    name        = _('Descendants of <person> not more than '
                    '<N> generations away')
    category    = _('Descendant filters')
    description = _("Matches people that are descendants of a "
                    "specified person not more than N generations away")

    def prepare(self,db):
        self.db = db
        self.map = set()
        try:
            root_person = db.get_person_from_gramps_id(self.list[0])
            self.init_list(root_person, 0)
        except:
            pass

    def reset(self):
        self.map.clear()

    def apply(self, db, person):
        return person.handle in self.map

    def init_list(self,person,gen):
        if not person:
            return
        if gen:
            self.map.add(person.handle)
            if gen >= int(self.list[1]):
                return

        for fam_id in person.get_family_handle_list():
            fam = self.db.get_family_from_handle(fam_id)
            if fam:
                for child_ref in fam.get_child_ref_list():
                    self.init_list(
                        self.db.get_person_from_handle(child_ref.ref), gen+1)
