# -*- encoding: utf-8 -*-

import configparser
import io
import os

from dataclasses import dataclass
from functools import partial


@dataclass(frozen=True)
class Canteen:
    """Configured OpenMensa canteen mapping."""

    key: str
    name: str
    street: str
    city: str
    id: str
    chash: str


def _get_config(filename):
    config = configparser.ConfigParser()
    path = os.path.join(os.path.dirname(__file__), filename)
    with io.open(path, encoding='utf-8') as config_file:
        config.read_file(config_file)
    return config


def _parse_canteen(config, canteen_name):
    get = partial(config.get, canteen_name)
    return Canteen(key=canteen_name,
                   name=get('name'),
                   street=get('street'),
                   city=get('city'),
                   id=get('id'),
                   chash=get('cHash'))


def read_canteen_config():
    """Read the configured canteens from file.

    :return: dictionary which maps from canteen short name to :class:`Canteen`.
    """
    config = _get_config('canteens.ini')
    return {name: _parse_canteen(config, name) for name in config.sections()}