"""
应用配置管理
使用 pydantic-settings 从环境变量读取配置
"""
from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """应用配置"""
    DATABASE_URL: str = "mysql+pymysql://root:password@localhost:3306/yuzong"
    SECRET_KEY: str = "your-secret-key-change-this"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 1440
    UPLOAD_DIR: str = "uploads"

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"


@lru_cache()
def get_settings() -> Settings:
    """获取配置单例"""
    return Settings()


settings = get_settings()