import yaml
from flask import Config as BaseConfig

from .defaults import DefaultConfig


class Config(BaseConfig):
    """
    Custom config class for the Flask application.
    """

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Set app-specific default values
        self.from_object(DefaultConfig)

    def from_yaml(self, filename: str, *, silent: bool = False) -> bool:
        """
        Update config from a YAML file.
        """
        return self.from_file(filename, load=yaml.safe_load, silent=silent)

    # Properties for type safe access to config values

    @property
    def sqlalchemy_database_uri(self) -> str:
        return self.get('SQLALCHEMY_DATABASE_URI')

    @property
    def sqlalchemy_echo(self) -> bool:
        return bool(self.get('SQLALCHEMY_ECHO'))