from __future__ import absolute_import
from __future__ import print_function

from argparse import ArgumentParser, RawTextHelpFormatter
from typing import Any, Dict, Text

from django.core.management.base import BaseCommand, CommandParser

from zerver.models import get_realm
from zerver.lib.actions import set_default_streams

from optparse import make_option
import sys

class Command(BaseCommand):
    help = """Set default streams for a realm

Users created under this realm will start out with these streams. This
command is not additive: if you re-run it on a realm with a different
set of default streams, those will be the new complete set of default
streams.

For example:

./manage.py set_default_streams --realm=foo --streams=foo,bar,baz
./manage.py set_default_streams --realm=foo --streams="foo,bar,baz with space"
./manage.py set_default_streams --realm=foo --streams=
"""

    # 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 add_arguments(self, parser):
        # type: (ArgumentParser) -> None
        parser.add_argument('-r', '--realm',
                            dest='string_id',
                            type=str,
                            help='The subdomain or string_id of the existing realm to which to '
                                 'attach default streams.')

        parser.add_argument('-s', '--streams',
                            dest='streams',
                            type=str,
                            help='A comma-separated list of stream names.')

    def handle(self, **options):
        # type: (**str) -> None
        if options["string_id"] is None or options["streams"] is None:
            print("Please provide both a subdomain name or string_id and a default \
set of streams (which can be empty, with `--streams=`).", file=sys.stderr)
            exit(1)

        stream_dict = {
            stream.strip(): {"description": stream.strip(), "invite_only": False}
            for stream in options["streams"].split(",")
        }  # type: Dict[Text, Dict[Text, Any]]
        realm = get_realm(options["string_id"])
        set_default_streams(realm, stream_dict)