from django.db.models import Manager
from django.db.models.query import QuerySet


class NoteQuerySet(QuerySet):

    def _ordered_by_field(self, field, reverse=False):
        return self.order_by('%s%s' % ("-" if reverse else "", field))

    def by_date(self, reverse=False):
        return self._ordered_by_field('created_date', reverse=reverse)

    def by_time(self, reverse=False):
        return self._ordered_by_field('created_time', reverse=reverse)


class NoteManager(Manager):

    def get_queryset(self):
        return NoteQuerySet(self.model)

    get_query_set = get_queryset

    def by_date(self, **kwargs):
        return self.get_queryset().by_date(**kwargs)

    def by_time(self, **kwargs):
        return self.get_queryset().by_time(**kwargs)