from __future__ import absolute_import

from django.contrib.auth.models import UserManager
from django.utils import timezone
from zerver.models import UserProfile, Recipient, Subscription
import base64
import ujson
import os
import string

def random_api_key():
    choices = string.ascii_letters + string.digits
    altchars = ''.join([choices[ord(os.urandom(1)) % 62] for _ in range(2)])
    return base64.b64encode(os.urandom(24), altchars=altchars)

# create_user_profile is based on Django's User.objects.create_user,
# except that we don't save to the database so it can used in
# bulk_creates
#
# Only use this for bulk_create -- for normal usage one should use
# create_user (below) which will also make the Subscription and
# Recipient objects
def create_user_profile(realm, email, password, active, bot, full_name,
                        short_name, bot_owner, is_mirror_dummy):
    now = timezone.now()
    email = UserManager.normalize_email(email)
    user_profile = UserProfile(email=email, is_staff=False, is_active=active,
                               full_name=full_name, short_name=short_name,
                               last_login=now, date_joined=now, realm=realm,
                               pointer=-1, is_bot=bot, bot_owner=bot_owner,
                               is_mirror_dummy=is_mirror_dummy,
                               onboarding_steps=ujson.dumps([]))

    if bot or not active:
        password = None

    user_profile.set_password(password)

    user_profile.api_key = random_api_key()
    return user_profile

def create_user(email, password, realm, full_name, short_name,
                active=True, bot=False, bot_owner=None,
                avatar_source=UserProfile.AVATAR_FROM_GRAVATAR,
                is_mirror_dummy=False, default_sending_stream=None,
                default_events_register_stream=None,
                default_all_public_streams=None):
    user_profile = create_user_profile(realm, email, password, active, bot,
                                       full_name, short_name, bot_owner,
                                       is_mirror_dummy)

    user_profile.avatar_source = avatar_source
    user_profile.default_sending_stream = default_sending_stream
    user_profile.default_events_register_stream = default_events_register_stream
    # Allow the ORM default to be used if not provided
    if default_all_public_streams is not None:
        user_profile.default_all_public_streams = default_all_public_streams

    user_profile.save()
    recipient = Recipient.objects.create(type_id=user_profile.id,
                                         type=Recipient.PERSONAL)
    Subscription.objects.create(user_profile=user_profile, recipient=recipient)
    return user_profile