app.py

import streamlit as st
from dotenv import load_dotenv
import os
from langchain_openai import ChatOpenAI

# Load environment variables
load_dotenv("apiroute.env")
api_key = os.getenv("OPENAI_API_KEY")
api_base = os.getenv("OPENAI_API_BASE")

# Ensure they exist
if not api_key or not api_base:
    st.error("❌ Missing API credentials in apiroute.env.")
    st.stop()

# Set for LangChain/OpenAI use
os.environ["OPENAI_API_KEY"] = api_key
os.environ["OPENAI_API_BASE"] = api_base

# Initialize LLM
llm = ChatOpenAI(model_name="google/gemma-3n-e2b-it:free", temperature=0.7)

# Streamlit setup
st.set_page_config(page_title="Chatbot", layout="centered")
st.title("💬 Chat with LLM")


if "history" not in st.session_state:
    st.session_state.history = []


for sender, msg in st.session_state.history:
    st.markdown(f"**{sender}:** {msg}")

user_input = st.text_input("Type your message and press Enter", key="input")


if user_input:
    st.session_state.history.append(("You", user_input))
    response = llm.invoke(user_input)
    st.session_state.history.append(("Bot", response.content))
    st.experimental_rerun()  # force UI refresh