import getpass
from argparse import Namespace, _SubParsersAction

from mdrsclient.api import UserApi
from mdrsclient.commands.base import BaseCommand
from mdrsclient.commands.utils import parse_remote_host
from mdrsclient.config import ConfigFile
from mdrsclient.connection import MDRSConnection
from mdrsclient.exceptions import MissingConfigurationException


class UserCommand(BaseCommand):
    @staticmethod
    def register(top_level_subparsers: _SubParsersAction) -> None:
        # login
        login_parser = top_level_subparsers.add_parser("login", help="login to remote host")
        login_parser.add_argument("remote", help="Label of remote host")
        login_parser.set_defaults(func=UserCommand.login)
        # logout
        logout_parser = top_level_subparsers.add_parser("logout", help="logout from remote host")
        logout_parser.add_argument("remote", help="Label of remote host")
        logout_parser.set_defaults(func=UserCommand.logout)
        # whoami
        whoami_parser = top_level_subparsers.add_parser("whoami", help="show current user name")
        whoami_parser.add_argument("remote", help="Label of remote host")
        whoami_parser.set_defaults(func=UserCommand.whoami)

    @staticmethod
    def login(args: Namespace) -> None:
        remote = parse_remote_host(args.remote)
        config = ConfigFile(remote)
        if config.url is None:
            raise MissingConfigurationException(f"Remote host `{remote}` is not found.")
        connection = MDRSConnection(config.remote, config.url)
        username = input("Username: ").strip()
        password = getpass.getpass("Password: ").strip()
        user_api = UserApi(connection)
        (user, token) = user_api.auth(username, password)
        connection.user = user
        connection.token = token

    @staticmethod
    def logout(args: Namespace) -> None:
        remote = parse_remote_host(args.remote)
        config = ConfigFile(remote)
        if config.url is None:
            raise MissingConfigurationException(f"Remote host `{remote}` is not found.")
        connection = MDRSConnection(config.remote, config.url)
        connection.logout()

    @staticmethod
    def whoami(args: Namespace) -> None:
        remote = parse_remote_host(args.remote)
        config = ConfigFile(remote)
        if config.url is None:
            raise MissingConfigurationException(f"Remote host `{remote}` is not found.")
        connection = MDRSConnection(config.remote, config.url)
        if connection.token is not None and connection.token.is_expired:
            connection.logout()
        username = connection.user.username if connection.user is not None else "(Anonymous)"
        print(username)