from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """应用配置，从环境变量 / .env 文件加载"""

    DATABASE_URL: str = "sqlite+aiosqlite:///./the_great_war.db"
    JWT_SECRET: str = "dev-secret-key-change-in-production"
    JWT_ALGORITHM: str = "HS256"
    JWT_EXPIRE_MINUTES: int = 1440  # 24 hours
    SERVER_HOST: str = "0.0.0.0"
    SERVER_PORT: int = 8080

    model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}


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