from __future__ import annotations

import os

from dotenv import load_dotenv
from langchain_google_genai import ChatGoogleGenerativeAI

load_dotenv()


def build_llm(model_name: str, temperature: float) -> ChatGoogleGenerativeAI:
    api_key = os.getenv("GEMINI_API_KEY")
    if not api_key:
        raise ValueError("GEMINI_API_KEY is not set in the environment.")
    return ChatGoogleGenerativeAI(
        model=model_name,
        google_api_key=api_key,
        temperature=temperature,
    )