class Feed(PolymorphicModel):
    active = models.BooleanField(default=True)
    feed_code = models.CharField(max_length=60)
    feed_delay = models.SmallIntegerField(default=0, validators=[MinValueValidator(-4)])
    feed_description = models.CharField(max_length=255, blank=True)
    feed_name = models.CharField(max_length=60)
    feed_type = models.ForeignKey(FeedType)
    partner = models.ForeignKey(Partner)

    # Schedule Settings
    schedule_type = models.CharField(max_length=1, choices=SCHEDULE_TYPE_CHOICES)
    # this is stored as minute of the day (so 6:30am is 390)
    time_of_day = models.IntegerField("Time", blank=True, null=True, choices=TIME_OF_DAY_CHOICES)

    class Meta:
        verbose_name_plural = 'Feeds'
        abstract = True

    def __unicode__(self):
        return u'%s' % self.feed_name

    def date_is_within_embargo(self, content_date):
        """
        Pass in a date (possibly an Issue publication date, and get a Boolean
        back indicating whether or not this feed is allowed to have the content.

        If the Content's date + feed_delay < today, return True
        """
        today = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)

        # Compute the most recent possible date, based on this feed's delay
        latest_valid_date = content_date + timedelta(days=int(self.feed_delay))

        # Return whether the requested date is before the latest valid date
        if latest_valid_date < today:
            return True

        return False

    def deliver(self):
        raise NotImplementedError('This must be implemented')


class KirkusHostedFTPFeed(Feed):
    username = models.CharField(max_length=24, unique=True)
    password = models.CharField(max_length=64)

    def deliver(self):
        pass


class EmailFeed(Feed):
    email_list = models.TextField(blank=True)

    def deliver(self):
        pass


class ExternalFTPFeed(Feed):
    remote_server_name = models.CharField(max_length=100, blank=True)
    remote_username = models.CharField(max_length=30, blank=True)
    remote_password = models.CharField(max_length=30, blank=True)
    remote_path = models.CharField(max_length=200, blank=True)

    def deliver(self):
        pass