import json
import logging

from dataclasses import dataclass, field
from spectrometer import config_dir
from pathlib import Path


@dataclass
class Config:
    config_path: Path

    _json: dict = field(default_factory=dict)
    _l: logging.Logger = None

    def __post_init__(self):
        self._l = logging.getLogger(__name__).getChild(self.__class__.__name__)

    def load(self) -> bool:
        self.config_path = self.config_path.expanduser()

        self._l.info(f"Carregando configuração de {self.config_path}")

        try:
            with self.config_path.open("r") as f:
                self._json = json.load(f)

            for k, v in self._json.items():
                setattr(self, k, v)
        except FileNotFoundError:
            self._l.exception("Arquivo de configuração não existe")
            raise RuntimeError()  # TODO: Usar exception customizada
        except json.JSONDecodeError:
            self._l.exception("Configuração inválida")
            raise RuntimeError()  # TODO: Usar exception customizada

        return True


_configs = {}


def get_config(name: str) -> Config:
    global _configs

    if name in _configs:
        return _configs[name]

    _configs[name] = Config(config_path=config_dir / name)
    _configs[name].load()
    return _configs[name]