from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True)
class Settings:
    app_name: str = "smart-deploy-agent-demo"
    app_env: str = os.getenv("APP_ENV", "demo")
    app_port: int = int(os.getenv("APP_PORT", "8000"))
    default_timezone: str = os.getenv("DEFAULT_TIMEZONE", "Asia/Shanghai")
    database_url: str = os.getenv("DATABASE_URL", "sqlite:///./data/agent_demo.db")


def get_settings() -> Settings:
    return Settings()


def ensure_runtime_directories() -> None:
    Path("data").mkdir(parents=True, exist_ok=True)