from argparse import Namespace
from typing import Any, Final

from mdrsclient.commands.base import BaseCommand
from mdrsclient.config import ConfigFile
from mdrsclient.connection import MDRSConnection
from mdrsclient.exceptions import MissingConfigurationException


class WhoamiCommand(BaseCommand):
    ANONYMOUS_USERNAME: Final[str] = "(Anonymous)"

    @classmethod
    def register(cls, parsers: Any) -> None:
        whoami_parser = parsers.add_parser("whoami", help="show current user name")
        whoami_parser.add_argument("remote", help="label of remote host")
        whoami_parser.set_defaults(func=cls.func)

    @classmethod
    def func(cls, args: Namespace) -> None:
        remote = str(args.remote)
        cls.whoami(remote)

    @classmethod
    def whoami(cls, remote: str) -> None:
        from mdrsclient.client import MdrsClient

        remote_host = MdrsClient.parse_remote_host(remote)
        client = MdrsClient.from_remote(remote_host)
        if client.connection.token is not None and client.connection.token.is_expired:
            client.logout()
        try:
            user = client.whoami()
            username = user.username if user is not None else cls.ANONYMOUS_USERNAME
        except Exception:
            username = cls.ANONYMOUS_USERNAME
        print(username)