"""
Utility functions for the LangGraph project.
"""

from langchain_openai import ChatOpenAI
from typing import Dict, Any

def get_llm() -> ChatOpenAI:
    """
    Returns a configured OpenAI LLM instance.
    """
    # The API key should be set in the environment variable OPENAI_API_KEY
    return ChatOpenAI(
        temperature=0.7,
        model_name="gpt-3.5-turbo",
    )

def format_state(state: Dict[str, Any]) -> str:
    """
    Formats the state dictionary into a string for display.
    """
    return "\n".join(f"{k}: {v}" for k, v in state.items())