from datetime import datetime, timedelta
import FeedEntry

class Feed(object):
    @staticmethod
    def all(session):
        return session.query(Feed).order_by(Feed.title).all()
    
    def __init__(self, title, rss_url):
        self.title = title
        self.rss_url = rss_url
        # default: update every 60 minutes
        self.update_interval = 60
        self.incrementNextUpdateDate()
        self.auto_load_entry_link = False

    def __repr__(self):
        return "<Feed (%d) %s>" % (self.pk, self.title)

    def userPresentableString(self):
        return self.title
    
    def entriesSortedByUpdateDate(self, hideReadEntries=False):
        sortedEntries = list(self.entries)
        sortedEntries.sort(FeedEntry.compareByUpdateDate)
        if hideReadEntries:
            return self._filterReadEntries(sortedEntries)
        return sortedEntries

    def _filterReadEntries(self, entries):
        retValue = []
        for entry in entries:
            if not entry.read:
                retValue.append(entry)
        return retValue

    def incrementNextUpdateDate(self):
        delta = timedelta(minutes=self.update_interval)
        self.next_update = datetime.now() + delta

    def markAllEntriesRead(self):
        for entry in self.entries:
            entry.markRead()