from datetime import datetime, time

from django.contrib.syndication.views import Feed
from django.http import Http404

from .models import BlogPage, BlogIndexPage
from django.utils.feedgenerator import Atom1Feed


class RssBlogFeed(Feed):
    title = "Konstantin's Blog Feed"
    description = "A blog on independent software development, Swift, Elixir and more..."

    def link(self):
        root = BlogIndexPage.objects.live().public().first()
        if not root:
            raise Http404
        return root.full_url

    def items(self):
        return BlogPage.objects.live().public().order_by("-first_published_at")

    def item_title(self, item):
        return item.title

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

    def item_link(self, item):
        return item.full_url

    def item_pubdate(self, item):
        return datetime.combine(item.date, time())

    def item_author_name(self, item):
        author = item.authors.first()
        if not author:
            return None

        return author.name


class AtomBlogFeed(RssBlogFeed):
    feed_type = Atom1Feed
    subtitle = RssBlogFeed.description