##############################################################################
#
#    OSIS stands for Open Student Information System. It's an application
#    designed to manage the core business of higher education institutions,
#    such as universities, faculties, institutes and professional schools.
#    The core business involves the administration of students, teachers,
#    courses, programs and so on.
#
#    Copyright (C) 2015-2018 Université catholique de Louvain (http://www.uclouvain.be)
#
#    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 3 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.
#
#    A copy of this license - GNU General Public License - is available
#    at the root of the source code of this program.  If not,
#    see http://www.gnu.org/licenses/.
#
##############################################################################
from django.db import models
from osis_common.models.serializable_model import SerializableModel, SerializableModelAdmin


class OfferAdmin(SerializableModelAdmin):
    list_display = ('id', 'title', 'changed')
    search_fields = ['title']


class Offer(SerializableModel):
    external_id = models.CharField(max_length=100, blank=True, null=True, db_index=True)
    changed = models.DateTimeField(null=True, auto_now=True)
    title = models.CharField(max_length=255)

    def __str__(self):
        return "{} {}".format(self.id, self.title)

    class Meta:
        permissions = (
            ("can_access_offer", "Can access offer"),
            ("can_access_catalog", "Can access catalog"),
        )


def find_by_id(offer_id):
    try:
        return Offer.objects.get(pk=offer_id)
    except Offer.DoesNotExist:
        return None
