from django.contrib.auth.models import UserManager
from django.utils.timezone import now as timezone_now
from zerver.models import UserProfile, Recipient, Subscription, Realm, Stream
import base64
import ujson
import os
import string

from typing import Optional, Text

def random_api_key():
    # type: () -> Text
    choices = string.ascii_letters + string.digits
    altchars = ''.join([choices[ord(os.urandom(1)) % 62] for _ in range(2)]).encode("utf-8")
    return base64.b64encode(os.urandom(24), altchars=altchars).decode("utf-8")

# 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_type, full_name,
                        short_name, bot_owner, is_mirror_dummy, tos_version,
                        timezone, tutorial_status=UserProfile.TUTORIAL_WAITING,
                        enter_sends=False):
    # type: (Realm, Text, Optional[Text], bool, Optional[int], Text, Text, Optional[UserProfile], bool, Text, Optional[Text], Optional[Text], bool) -> UserProfile
    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=bool(bot_type), bot_type=bot_type,
                               bot_owner=bot_owner, is_mirror_dummy=is_mirror_dummy,
                               tos_version=tos_version, timezone=timezone,
                               tutorial_status=tutorial_status,
                               enter_sends=enter_sends,
                               onboarding_steps=ujson.dumps([]),
                               default_language=realm.default_language)

    if bot_type 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, is_realm_admin=False, bot_type=None, bot_owner=None, tos_version=None,
                timezone="", 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_id=None):
    # type: (Text, Optional[Text], Realm, Text, Text, bool, bool, Optional[int], Optional[UserProfile], Optional[Text], Text, Text, bool, Optional[Stream], Optional[Stream], Optional[bool], Optional[int]) -> UserProfile
    user_profile = create_user_profile(realm, email, password, active, bot_type,
                                       full_name, short_name, bot_owner,
                                       is_mirror_dummy, tos_version, timezone)
    user_profile.is_realm_admin = is_realm_admin
    user_profile.avatar_source = avatar_source
    user_profile.timezone = timezone
    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

    if user_profile_id is not None:
        user_profile.id = user_profile_id

    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