"""
app/config.py - 应用配置管理
"""

from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """应用配置"""

    # API 配置
    api_key: str
    model: str = "gemini-3.1-flash"
    base_url: str = "https://generativelanguage.googleapis.com/v1beta/openai/"

    # FastAPI 配置
    fastapi_host: str = "0.0.0.0"
    fastapi_port: int = 8000
    fastapi_debug: bool = True

    # LangGraph 配置
    langgraph_debug: bool = False

    # 项目信息
    project_name: str = "AI Agent Project"
    project_version: str = "0.1.0"

    class Config:
        env_file = ".env"
        case_sensitive = False


@lru_cache()
def get_settings() -> Settings:
    """获取应用配置的单例"""
    return Settings()