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() -> 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: Realm, email: Text, password: Optional[Text],
                        active: bool, bot_type: Optional[int], full_name: Text,
                        short_name: Text, bot_owner: Optional[UserProfile],
                        is_mirror_dummy: bool, tos_version: Optional[Text],
                        timezone: Optional[Text],
                        tutorial_status: Optional[Text] = UserProfile.TUTORIAL_WAITING,
                        enter_sends: bool = False) -> 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: Text, password: Optional[Text], realm: Realm,
                full_name: Text, short_name: Text, active: bool = True,
                is_realm_admin: bool = False, bot_type: Optional[int] = None,
                bot_owner: Optional[UserProfile] = None,
                tos_version: Optional[Text] = None, timezone: Text = "",
                avatar_source: Text = UserProfile.AVATAR_FROM_GRAVATAR,
                is_mirror_dummy: bool = False,
                default_sending_stream: Optional[Stream] = None,
                default_events_register_stream: Optional[Stream] = None,
                default_all_public_streams: Optional[bool] = None,
                user_profile_id: Optional[int] = None) -> 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