from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.auth.models import UserManager
from django.utils import timezone
from zephyr.models import UserProfile
import base64
import hashlib

# create_user_hack is the same as Django's User.objects.create_user,
# except that we don't save to the database so it can used in
# bulk_creates
def create_user_hack(username, password, email, active):
    now = timezone.now()
    email = UserManager.normalize_email(email)
    user = User(username=username, email=email,
                is_staff=False, is_active=active, is_superuser=False,
                last_login=now, date_joined=now)

    if active:
        user.set_password(password)
    else:
        user.set_unusable_password()
    return user

def create_user_base(email, password, active=True):
    # NB: the result of Base32 + truncation is not a valid Base32 encoding.
    # It's just a unique alphanumeric string.
    # Use base32 instead of base64 so we don't have to worry about mixed case.
    # Django imposes a limit of 30 characters on usernames.
    email_hash = hashlib.sha256(settings.HASH_SALT + email).digest()
    username = base64.b32encode(email_hash)[:30]
    return create_user_hack(username, password, email, active)

def create_user(email, password, realm, full_name, short_name,
                active=True):
    user = create_user_base(email=email, password=password,
                            active=active)
    user.save()
    return UserProfile.create(user, realm, full_name, short_name)