from __future__ import annotations

import os
from dataclasses import dataclass


@dataclass(frozen=True, slots=True)
class Settings:
    flex_auth_base_url: str | None
    flex_auth_timeout_seconds: float
    host: str
    port: int
    database_path: str | None = None

    @classmethod
    def from_env(cls) -> "Settings":
        return cls(
            flex_auth_base_url=os.getenv("TENANT_ENGINE_FLEX_AUTH_URL") or None,
            flex_auth_timeout_seconds=float(os.getenv("TENANT_ENGINE_FLEX_AUTH_TIMEOUT_SECONDS", "3")),
            host=os.getenv("TENANT_ENGINE_HOST", "127.0.0.1"),
            port=int(os.getenv("TENANT_ENGINE_HTTP_PORT", "8090")),
            database_path=os.getenv("TENANT_ENGINE_DATABASE_PATH") or None,
        )