from transformers import pipeline
from langchain.embeddings import HuggingFaceEmbeddings
from langchain.llms import HuggingFaceHub
from langchain.chains import RetrievalQA

class RAGAgent:
    def __init__(self, vectorstore):
        self.retriever = vectorstore.as_retriever()
        self.qa = RetrievalQA.from_chain_type(
            llm=HuggingFaceHub(repo_id="google/flan-t5-base", model_kwargs={"temperature": 0}),
            retriever=self.retriever
        )

    def answer(self, query):
        try:
            return self.qa.run(query)
        except Exception as e:
            return f"Error: {str(e)}"