"""This file contains the feed class for the forums application."""

from django.contrib.syndication.views import Feed
from django.core.exceptions import ObjectDoesNotExist
from django.shortcuts import get_object_or_404
from django.utils.decorators import method_decorator
from django.views.decorators.cache import cache_page

from forums.models import Forum
from forums.models import Post
from core.functions import copyright_str


class ForumsFeed(Feed):
    """The Feed class for a specific forum"""

    ttl = '720'
    author_name = 'Brian Neal'
    author_email = 'admin@surfguitar101.com'

    @method_decorator(cache_page(15 * 60))
    def __call__(self, request, *args, **kwargs):
        return super(ForumsFeed, self).__call__(request, *args, **kwargs)

    def get_object(self, request, forum_slug):
        # only return public forums
        if forum_slug:
            forum = get_object_or_404(Forum, slug=forum_slug)
            if forum.category.groups.count() > 0:
                raise ObjectDoesNotExist
            return forum

        else:
            # return None to indicate we want a combined feed
            return None

    def title(self, obj):
        if obj is None:
            forum_name = 'Combined'
        else:
            forum_name = obj.name

        return 'SurfGuitar101.com %s Forum Feed' % forum_name

    def link(self, obj):
        if obj is None:
            bits = ''
        else:
            bits = obj.slug + '/'

        return '/feeds/forums/' + bits

    def description(self, obj):
        if obj is None:
            return "User posts to SurfGuitar101.com forums."
        return obj.description

    def feed_copyright(self):
        return copyright_str()

    def items(self, obj):
        if obj is None:
            # return a combined feed of public forum threads
            items = Post.objects.filter(
                    topic__forum__in=Forum.objects.public_forums())
        else:
            items = Post.objects.filter(topic__forum__id=obj.id)
        return items.order_by('-creation_date').select_related()[:10]

    def item_title(self, item):
        return item.topic.name

    def item_description(self, item):
        return item.html

    def item_author_name(self, item):
        return item.user.username

    def item_pubdate(self, item):
       return item.creation_date

    def item_categories(self, item):
       return (item.topic.forum.name, )