"""Utils for emencia.django.newsletter"""
from django.template import Context, Template
import random
from datetime import datetime
try:
    from hashlib import sha1
except ImportError:
    from django.utils.hashcompat import sha_constructor as sha1




def render_string(template_string, context={}):
    """Shortcut for render a template string with a context"""
    t = Template(template_string)
    c = Context(context)
    return t.render(c)


def make_activation_code():
    """ Generate a unique activation code. """
    random_string = str(random.random())
    random_digest = sha1(random_string).hexdigest()[:5]
    time_string = str(datetime.now().microsecond)

    combined_string = random_digest + time_string

    return sha1(combined_string).hexdigest()