Update chatbot_logic.py

chatbot_logic.py

@@ -1,22 +1,28 @@
 from langchain_community.vectorstores import Chroma
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.llms import HuggingFaceHub 
-from langchain_huggingface import HuggingFaceEndpoint
 from langchain.chains import RetrievalQA
 from knowledge_base import load_vectorstore
+
+from dotenv import load_dotenv  # 👈 load environment variables
 import os
 
-# Load vectorstore with meal plan embeddings
+# === Load secret token from environment ===
+load_dotenv()
+hf_token = os.getenv("HUGGINGFACEHUB_API_TOKEN")
+
+# === Load vectorstore with meal plan embeddings ===
 db = load_vectorstore()
 retriever = db.as_retriever()
 
-# Load LLM (HuggingFace Inference API)
+# === Load LLM (HuggingFace Inference API) ===
 llm = HuggingFaceHub(
     repo_id="mistralai/Mistral-7B-Instruct-v0.1",
+    huggingfacehub_api_token=hf_token,  # 👈 pass token here
     model_kwargs={"temperature": 0.3, "max_new_tokens": 512}
 )
 
-# Build Retrieval QA Chain
+# === Build Retrieval QA Chain ===
 qa_chain = RetrievalQA.from_chain_type(
     llm=llm,
     retriever=retriever,