from os import getenv
from dataclasses import dataclass


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

    * `base_url`: url of domain
    * `port`: server port (default **3001**)
    * `teletoken`: telegram api token.
    * `bot_owner`: telegram id of bot owner.
    """
    base_url: str
    port: int
    teletoken: str
    bot_owner: int


class ConfigError(Exception):
    pass


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

_bot_owner = getenv('LTLNOTIFIER_BOT_OWNER')
print(_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.')

_base_url = getenv('LTLNOTIFIER_BASE_URL')
# Check base url
if not _base_url:
    raise ConfigError('virtual environment LTLNOTIFIER_BASE_URL not set')

_port = getenv('LTLNOTIFIER_PORT', default='')
_port = int(_port) if _port.isdigit() else 3001

config = Config(teletoken=_teletoken,
                port=_port,
                bot_owner=_bot_owner,
                base_url=_base_url)

__all__ = ('Config', 'config')