from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


BASE_DIR = Path(__file__).resolve().parent.parent


@dataclass(frozen=True)
class Settings:
    app_name: str = os.getenv("APP_NAME", "激光材料数据平台")
    secret: str = os.getenv("APP_SECRET", "dev-only-change-this-secret")
    database_url: str = os.getenv("DATABASE_URL", f"sqlite:///{BASE_DIR / 'data' / 'laser_data.db'}")
    admin_username: str = os.getenv("ADMIN_USERNAME", "admin")
    admin_password: str = os.getenv("ADMIN_PASSWORD", "Admin@123456")
    session_hours: int = int(os.getenv("SESSION_HOURS", "12"))
    backup_keep_days: int = int(os.getenv("BACKUP_KEEP_DAYS", "30"))
    backup_dir: Path = BASE_DIR / "backups"


settings = Settings()
for directory in (BASE_DIR / "data", settings.backup_dir):
    directory.mkdir(parents=True, exist_ok=True)