#  Copyright (C) 2008       Bradley M. Kuhn <bkuhn@ebb.org>
#  Copyright (C) 2006, 2007 Software Freedom Law Center, Inc.
#
# This software's license gives you freedom; you can copy, convey,
# propogate, redistribute and/or modify this program under the terms of
# the GNU Affero General Public License (AGPL) as published by the Free
# Software Foundation (FSF), either version 3 of the License, or (at your
# option) any later version of the AGPL published by the FSF.
#
# 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 Affero
# General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program in a file in the toplevel directory called
# "AGPLv3".  If not, see <http://www.gnu.org/licenses/>.
#
from datetime import datetime
from functools import reduce
from operator import or_

from django.shortcuts import get_object_or_404, render

from .models import Cast, CastTag, Podcast


def podcasts(request):
    podcasts = Podcast.objects.all()
    return render(request, 'podjango/podcasts.html', {'podcasts': podcasts})


def OR_filter(field_name, objs):
    from django.db.models import Q
    return reduce(or_,
                  [Q(**{field_name: x.id}) for x in objs])


def last_name(person):
    return person.formal_name.rpartition(' ')[2]


def custom_index(request, podcast_slug, *args, **kwargs):
    """Cast list view that allows scrolling and also shows an index by
    year.
    """

    podcast = get_object_or_404(Podcast, slug=podcast_slug)
    kwargs = kwargs.copy()
    kwargs['extra_context'] = kwargs.get('extra_context', {}).copy()
    extra_context = kwargs['extra_context']

    date_field = kwargs['date_field']
    del kwargs['date_field']

    if not kwargs.get('allow_future', False):
        queryset = Cast.objects.filter(
            podcast=podcast,
            **{'%s__lte' % date_field: datetime.now()},
        )

    tags = []
    if 'tag' in request.GET:
        tags = [get_object_or_404(CastTag, slug=tag)
                for tag in request.GET.getlist('tag')]
        extra_context['tags'] = tags
        queryset = queryset.filter(OR_filter('tags', tags), podcast=podcast)

    if tags:
        query_string = '&'.join('tag=%s' % t.slug for t in tags)
        extra_context['query_string'] = query_string

    else:
        date_list = queryset.dates(date_field, 'year')
        extra_context['date_list'] = date_list

    return render(request, 'podjango/cast_list.html', {'podcast': podcast,
                                                       'object_list': queryset,
                                                       'tags': tags})