# copyright 2017 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# copyright 2014-2016 UNLISH S.A.S. (Montpellier, FRANCE), all rights reserved.

#

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb 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 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""Contains predicates used in Pyramid views.

"""

from cubicweb._exceptions import UnknownEid

class MatchIsEIDPredicate(object):

    """A predicate that match if a given eid exist in the database.

    """

    def __init__(self, matchname, config):

        self.matchname = matchname

    def text(self):

        return 'match_is_eid = %s' % self.matchname

    phash = text

    def __call__(self, info, request):

        try:

            eid = int(info['match'][self.matchname])

        except ValueError:

            return False

        try:

            request.cw_cnx.entity_from_eid(eid)

        except UnknownEid:

            return False

        return True

class MatchIsETypeAndEIDPredicate(object):

    """A predicate that match if a given eid exist in the database and if the

    etype of the entity same as the one given in the URL

    """

    def __init__(self, matchnames, config):

        self.match_etype, self.match_eid = matchnames

    def text(self):

        return f"match_is_etype_and_eid = {self.match_etype}/{self.match_eid}"

    phash = text

    def __call__(self, info, request):

        try:

            eid = int(info['match'][self.match_eid])

        except ValueError:

            return False

        try:

            entity = request.cw_cnx.entity_from_eid(eid)

        except UnknownEid:

            return False

        etype = info['match'][self.match_etype]

        return entity.__regid__.lower() == etype.lower()

def includeme(config):

    config.add_route_predicate('match_is_eid', MatchIsEIDPredicate)

    config.add_route_predicate('match_is_etype_and_eid', MatchIsETypeAndEIDPredicate)