from __future__ import absolute_import
from __future__ import print_function

from argparse import ArgumentParser, RawTextHelpFormatter
from typing import Any
from django.conf import settings
from django.core.management.base import BaseCommand
from django.db import ProgrammingError
from confirmation.models import generate_realm_creation_url
from zerver.models import Realm
import sys

class Command(BaseCommand):
    help = """
    Outputs a randomly generated, 1-time-use link for Organization creation.
    Whoever visits the link can create a new organization on this server, regardless of whether
    settings.OPEN_REALM_CREATION is enabled. The link would expire automatically after
    settings.REALM_CREATION_LINK_VALIDITY_DAYS.

    Usage: ./manage.py generate_realm_creation_link """

    # Fix support for multi-line usage
    def create_parser(self, *args, **kwargs):
        # type: (*Any, **Any) -> ArgumentParser
        parser = super(Command, self).create_parser(*args, **kwargs)
        parser.formatter_class = RawTextHelpFormatter
        return parser

    def handle(self, *args, **options):
        # type: (*Any, **Any) -> None
        try:
            # first check if the db has been initalized
            Realm.objects.first()
        except ProgrammingError:
            print("The Zulip database does not appear to exist. Have you run initialize-database?")
            sys.exit(1)

        url = generate_realm_creation_url()
        self.stdout.write(
            "\033[1;92mPlease visit the following secure single-use link to register your ")
        self.stdout.write("new Zulip organization:\033[0m")
        self.stdout.write("")
        self.stdout.write("    \033[1;92m%s\033[0m" % (url,))
        self.stdout.write("")