from __future__ import annotations

import dataclasses
import os.path
import typing

import yaml


@dataclasses.dataclass
class Config:
    controllers: typing.List[str]
    secret: str
    venue_info_url: typing.Optional[str]
    session_timeout: int  # in seconds
    debug: bool

    @staticmethod
    def load(filename: typing.Optional[str]=None) -> 'Config':
        if filename is None:
            for name in ('capport.yaml', '/etc/capport.yaml'):
                if os.path.exists(name):
                    return Config.load(name)
            raise RuntimeError("Missing config file")
        with open(filename) as f:
            data = yaml.safe_load(f)
        controllers = list(map(str, data['controllers']))
        return Config(
            controllers=controllers,
            secret=str(data['secret']),
            venue_info_url=str(data.get('venue-info-url')),
            session_timeout=data.get('session-timeout', 3600),
            debug=data.get('debug', False)
        )