from django.contrib.syndication.views import Feed

from django.utils.feedgenerator import Rss201rev2Feed 

from conservancy.apps.news.models import PressRelease

from conservancy.apps.blog.models import Entry as BlogEntry

from django.conf import settings

from datetime import datetime

import itertools

import operator

class ConservancyFeedBase(Feed):

    def copyright_holder(self): return "Software Freedom Conservancy"

    def license_no_html(self): return "Licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License."

    def item_copyright(self, item):

        year = 2008

        for attr in ('pub_date', 'date_created', 'date_last_modified'):

            if hasattr(item, attr):

                if hasattr(getattr(item, attr), 'year'):

                    year = getattr(getattr(item, attr), 'year')

                    break

        return 'Copyright (C) %d, %s.  %s' % (year, self.copyright_holder(), self.license_no_html())

    def item_extra_kwargs(self, item):

        year = 2008

        for attr in ('pub_date', 'date_created', 'date_last_modified'):

            if hasattr(item, attr):

        def OR_filter(field_name, subfield_name, objs):

            from django.db.models import Q

            return reduce(lambda x, y: x | y,

                          [Q(**{'%s__%s' % (field_name, subfield_name): x})

                           for x in objs])

        queryset = BlogEntry.objects.filter(pub_date__lte=datetime.now())

        if 'author' in GET:

            authors = GET.getlist('author')

            queryset = queryset.filter(OR_filter('author', 'username', authors))

        if 'tag' in GET:

            tags = GET.getlist('tag')

            queryset = queryset.filter(OR_filter('tags', 'slug', tags))

        return queryset.order_by('-pub_date')[:10]

def view(request):

    """Listing of all available feeds

    """

    feeds = (PressReleaseFeed, BlogFeed, OmnibusFeed)