from django.contrib.syndication.views import Feed, FeedDoesNotExist
from wiki.models import ChangeSet, Article
from django.utils.feedgenerator import Atom1Feed, Rss201rev2Feed

# Validated through http://validator.w3.org/feed/


class RssHistoryFeed(Feed):

    feed_type = Rss201rev2Feed
    title = 'History for all articles'
    description = 'Recent changes in wiki'
    link = '/wiki/feeds/rss/'
    title_template = 'wiki/feeds/history_title.html'
    description_template = 'wiki/feeds/history_description.html'

    def items(self):
        return ChangeSet.objects.order_by('-modified')[:30]

    def item_pubdate(self, item):
        """Return the item's pubdate.
    
        It's this modified date
    
        """
        return item.modified

# Validated through http://validator.w3.org/feed/


class AtomHistoryFeed(RssHistoryFeed):

    feed_type = Atom1Feed
    subtitle = 'Recent changes in wiki'
    link = '/wiki/feeds/atom/'

    def item_updateddate(self, item):
        return item.modified

# Validated through http://validator.w3.org/feed/


class RssArticleHistoryFeed(Feed):
    feed_type = Rss201rev2Feed
    title_template = u'wiki/feeds/history_title.html'
    description_template = u'wiki/feeds/history_description.html'

    def get_object(self, request, *args, **kwargs):
        return Article.objects.get(title=kwargs['title'])

    def title(self, item):
        return 'History for: %s ' % item.title

    def link(self, item):
        if not item:
            raise FeedDoesNotExist
        return item.get_absolute_url()

    def description(self, item):
        return 'Recent changes in %s' % item.title

    def items(self, item):
        return ChangeSet.objects.filter(article__id__exact=item.id).order_by('-modified')[:30]

    def item_pubdate(self, item):
        """Returns the modified date."""
        return item.modified

# Validated through http://validator.w3.org/feed/


class AtomArticleHistoryFeed(RssArticleHistoryFeed):
    feed_type = Atom1Feed

    def subtitle(self, item):
        return 'Recent changes in %s' % item.title

    def item_updateddate(self, item):
        return item.modified