app.py

# app.py
import os
import openai
import streamlit as st

# Load OpenAI API key from Hugging Face Secrets
openai.api_key = os.getenv("OPENAI_API_KEY")

# Set Streamlit page config
st.set_page_config(page_title="OpenAI Chatbot", layout="centered")

st.title("💬 OpenAI Chatbot")
st.markdown("Talk with GPT-4 using OpenAI API.")

# Initialize chat history
if "messages" not in st.session_state:
    st.session_state.messages = [
        {"role": "system", "content": "You are a helpful assistant."}
    ]

# Display previous messages
for msg in st.session_state.messages[1:]:
    if msg["role"] == "user":
        st.chat_message("user").markdown(msg["content"])
    elif msg["role"] == "assistant":
        st.chat_message("assistant").markdown(msg["content"])

# Chat input
if prompt := st.chat_input("Say something..."):
    st.chat_message("user").markdown(prompt)
    st.session_state.messages.append({"role": "user", "content": prompt})

    try:
        # Get response from OpenAI
        response = openai.ChatCompletion.create(
            model="gpt-4",  # or "gpt-3.5-turbo"
            messages=st.session_state.messages,
            temperature=0.7,
        )
        reply = response.choices[0].message["content"]
        st.chat_message("assistant").markdown(reply)
        st.session_state.messages.append({"role": "assistant", "content": reply})
    except Exception as e:
        error_msg = f"❌ Error: {str(e)}"
        st.chat_message("assistant").markdown(error_msg)