import logging
from argparse import ArgumentParser
from typing import Any, List, Optional

from django.db import connection

from zerver.lib.fix_unreads import fix
from zerver.lib.management import CommandError, ZulipBaseCommand
from zerver.models import Realm, UserProfile

logging.getLogger('zulip.fix_unreads').setLevel(logging.INFO)

class Command(ZulipBaseCommand):
    help = """Fix problems related to unread counts."""

    def add_arguments(self, parser: ArgumentParser) -> None:
        parser.add_argument('emails',
                            metavar='<emails>',
                            nargs='*',
                            help='email address to spelunk')
        parser.add_argument('--all',
                            action='store_true',
                            help='fix all users in specified realm')
        self.add_realm_args(parser)

    def fix_all_users(self, realm: Realm) -> None:
        user_profiles = list(UserProfile.objects.filter(
            realm=realm,
            is_bot=False,
        ))
        for user_profile in user_profiles:
            fix(user_profile)
            connection.commit()

    def fix_emails(self, realm: Optional[Realm], emails: List[str]) -> None:

        for email in emails:
            try:
                user_profile = self.get_user(email, realm)
            except CommandError:
                print(f"e-mail {email} doesn't exist in the realm {realm}, skipping")
                return

            fix(user_profile)
            connection.commit()

    def handle(self, *args: Any, **options: Any) -> None:
        realm = self.get_realm(options)

        if options['all']:
            if realm is None:
                raise CommandError('You must specify a realm if you choose the --all option.')

            self.fix_all_users(realm)
            return

        self.fix_emails(realm, options['emails'])