import sys

from oauthlib.oauth2 import LegacyApplicationClient, OAuth2Error
from requests_oauthlib import OAuth2Session

from apiclient.config import get_cfg


def get_legacy_token(env):
    cfg = get_cfg(env)

    client = LegacyApplicationClient(client_id=cfg['client_id'])
    oauth = OAuth2Session(client=client)

    try:
        token = oauth.fetch_token(
            token_url=cfg['token_url'],
            username=cfg['login'],
            password=cfg['password'],
            client_id=cfg['client_id'],
            client_secret=cfg['client_secret'],
            audience=cfg['audience'],
            scope=cfg['scopes']
        )
    except OAuth2Error as e:
        print("OAuth2 Error: ", str(e), file=sys.stderr)
        sys.exit(e.status_code)

    return token