"""
Configuration file handling

Takes care of parsing the configuration file if it exists.
"""

import pathlib

import pydantic
import yaml


class Config(pydantic.BaseModel):
    domain_aliases: dict[str, str] = pydantic.Field(default=dict())


def get_configuration(*, path: str | pathlib.Path | None = None) -> Config:
    """Reads and parses the configuration file at <path> if provided, otherwise defaults to ~/.config/frg.yaml"""
    if not path:
        path = pathlib.Path.home().joinpath(".config", "frg.yaml")

    config_path = pathlib.Path(path)

    if not config_path.exists():
        raise FileNotFoundError("Configuration not found at %s", str(path))

    with open(config_path, "r", encoding="utf8") as config_file:
        return Config(**yaml.safe_load(config_file))