from pydantic_settings import BaseSettings
from functools import lru_cache
import os


class Settings(BaseSettings):
    APP_NAME: str = "TianpuEMS"
    DEBUG: bool = True
    API_V1_PREFIX: str = "/api/v1"

    DATABASE_URL: str = "sqlite+aiosqlite:///./tianpu_ems.db"
    DATABASE_URL_LOCAL: str = ""
    DATABASE_URL_SYNC: str = "sqlite:///./tianpu_ems.db"
    REDIS_URL: str = "redis://localhost:6379/0"

    SECRET_KEY: str = "tianpu-ems-secret-key-change-in-production-2026"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 480

    class Config:
        env_file = ".env"
        extra = "ignore"


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