from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True, slots=True)
class Settings:
    environment: str
    debug: bool
    data_directory: Path

    @classmethod
    def from_environment(cls) -> Settings:
        environment = os.getenv("APP_ENV", "development").strip().lower()
        data_directory = Path(os.getenv("APP_DATA_DIR", "data")).resolve()
        return cls(
            environment=environment,
            debug=environment == "development",
            data_directory=data_directory,
        )