import json
import pathlib

class configurator_exception(Exception):
    pass

class configurator:
    def __init__(self, config_path: pathlib.Path | None) -> None: 
        if config_path is None:
            config_path = self.default_path

        if not config_path.is_file() or not config_path.exists():
            raise configurator_exception(
                "Config file \"" \
                + str(config_path) \
                + "\" not exists."
            )

        with config_path.open() as handler:
            try:
                self.__storage = json.loads(handler.read())

            except Exception as error:
                raise configurator_exception(
                    "Config file is not correct. Error: \"" 
                    + str(error) 
                    + "\"."
                ) 

    @staticmethod
    def default_path() -> pathlib.Path:
        return pathlib.Path("./config.json")

    def get(self, key: str) -> any:
        result = self.__storage

        for count in key.split("."):
            count = count.strip()

            if len(count) == 0:
                raise configurator_exception("Empty slot in key.")

            if not count in result:
                raise configurator_exception(
                    "\"" \
                    + count \
                    + "\" not exists in configuration storage."
                )

            result = result[count]
    @

        return result