"""
Provide RSS and Atom feeds for Pulse.
"""
from django.contrib.syndication.views import Feed
from django.utils.feedgenerator import Atom1Feed

from pulseapi import settings
from pulseapi.entries.models import Entry


# The creator(s) name can be found in the `EntryCreator` class from the `creators` models.
def get_entry_creators(entry):
    # Since `creators` is an optional field and can be empty, we return the publisher name instead.
    entry_creators = entry.related_entry_creators.all()
    if len(entry_creators) >= 1:
        return ', '.join(
            entry_creator.profile.name
            for entry_creator in entry_creators
        )
    else:
        return entry.published_by.name


# Generic class for RSS feeds
class RSSFeedFromPulse(Feed):
    def item_author_name(self, entry):
        return get_entry_creators(entry)

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

    def item_pubdate(self, entry):
        return entry.created

    def item_description(self, entry):
        return entry.description

    def item_enclosure_url(self, entry):
        if entry.thumbnail:
            if settings.USE_S3:
                return entry.thumbnail.url
            # Provide an absolute URL for local dev purposes
            else:
                return settings.ALLOWED_HOSTS[0] + ':8000' + entry.thumbnail.url

    def item_enclosure_length(self, entry):
        return ''

    def item_enclosure_mime_type(self, entry):
        return 'image/jpeg'

    def item_link(self, entry):
        return entry.frontend_entry_url()

    def item_categories(self, entry):
        return list(entry.tags.values_list('name', flat=True)) + list(entry.issues.values_list('name', flat=True))


# RSS feed for latest entries
class RSSFeedLatestFromPulse(RSSFeedFromPulse):
    title = 'Latest from Mozilla Pulse'
    link = '{frontend_url}/latest'.format(frontend_url=settings.PULSE_FRONTEND_HOSTNAME)
    description = 'Subscribe to get the latest entries from Mozilla Pulse.'

    def items(self):
        return Entry.objects.public().with_related().order_by('-created')[:20]


# RSS feed for featured entries
class RSSFeedFeaturedFromPulse(RSSFeedFromPulse):
    title = 'Latest from Mozilla Pulse'
    link = '{frontend_url}/featured'.format(frontend_url=settings.PULSE_FRONTEND_HOSTNAME)
    description = 'Subscribe to get the latest featured entries from Mozilla Pulse.'

    def items(self):
        return Entry.objects.filter(featured=True).order_by('-created')[:20]


# Atom feed for latest entries
class AtomFeedLatestFromPulse(RSSFeedLatestFromPulse):
    feed_type = Atom1Feed
    subtitle = RSSFeedLatestFromPulse.description


# Atom feed for featured entries
class AtomFeedFeaturedFromPulse(RSSFeedFeaturedFromPulse):
    feed_type = Atom1Feed
    subtitle = RSSFeedLatestFromPulse.description