import os
import yaml
from pathlib import Path
from dataclasses import dataclass

from jinja2 import BaseLoader, Environment


def render_env_template(raw_config: str) -> dict:
    template = Environment(loader=BaseLoader).from_string(raw_config)
    conf = template.render(**os.environ)
    return yaml.safe_load(conf)


@dataclass
class Config:
    db_path: Path

    matrix_homeserver_url: str
    matrix_full_bot_id: str
    matrix_bot_password: str

    telegram_bot_token: str

    matrix_owner_id: str

    @classmethod
    def from_dict(config_class, dict):
        return config_class(**dict)

    @classmethod
    def from_yaml_config(config_class, path: Path):
        with open(path) as raw:
            return config_class.from_dict(render_env_template(raw.read()))