from os import getenv
from dataclasses import dataclass


@dataclass
class Config:
    """
    Notifier config dataclass.

    * `api_token`: telegram api token.
    * `param bot_owner`: telegram id of bot owner.
    """
    api_token: str
    bot_owner: int


class ConfigError(Exception):
    pass


_api_token = getenv('LTLNOTIFIER_API_TOKEN')
# Check api token
if not _api_token:
    raise ConfigError('virtual environment LTLNOTIFIER_API_TOKEN not set.')
if len(_api_token) != 45 or _api_token[9] or not _api_token[:9].isdigit():
    raise ConfigError('virtual environment LTLNOTIFIER_API_TOKEN incorrect.')

_bot_owner = getenv('LTLNOTIFIER_BOT_OWNER')
# Check bot owner
if not _bot_owner:
    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER not set.')
try:
    if len(_bot_owner) != 9:
        raise ValueError
    _bot_owner = int(_bot_owner)
except ValueError:
    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER incorrect.')

config = Config(api_token=_api_token, bot_owner=_bot_owner)

__all__ = ['Config', 'config']