from pydantic_settings import BaseSettings
from functools import lru_cache
from pathlib import Path

# 项目根目录（backend/ 的上级目录）
PROJECT_ROOT = Path(__file__).parent.parent
ENV_FILE = PROJECT_ROOT / ".env"


class Settings(BaseSettings):
    database_url: str = "sqlite+aiosqlite:///./certcenter.db"
    secret_key: str = "change-me-to-a-random-string"
    admin_username: str = "admin"
    admin_password: str = "admin123"
    cert_dir: str = "/srv/certs"
    base_url: str = "https://cert.example.com"

    class Config:
        env_file = str(ENV_FILE)
        env_file_encoding = "utf-8"


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