app.py

import streamlit as st
from openai import OpenAI

st.set_page_config(page_title="Streamlit + OpenAI Assistant")

st.title("Basic Chatbot with Streamlit and OpenAI Assistant")
st.caption("Features text streaming using OpenAI Assistants API")

# Text input to enter OpenAI API key
with st.sidebar:
    OPENAI_API_KEY = st.text_input("Enter your OpenAI API Key", type="password")

# Initialize OpenAI client
if OPENAI_API_KEY:
    client = OpenAI(api_key=OPENAI_API_KEY)
else:
    st.error("Please enter your OpenAI API key to continue.")
    st.stop()

ASSISTANT_ID = "asst_rd9h8PfYuOmHbkvOF3RTmVfn"

# Streamlit session state
if "messages" not in st.session_state:
    st.session_state["messages"] = []

# Display all chat messages from session state
for message in st.session_state.messages:
    st.chat_message(message["role"]).write(message["content"])

# User input
if prompt := st.chat_input():
    st.session_state.messages.append({"role": "user", "content": prompt})
    st.chat_message("user").write(prompt)

    # Send message to OpenAI Assistant
    try:
        thread = client.beta.threads.create()
        thread_id = thread.id
        client.beta.threads.messages.create(
            thread_id=thread_id,
            role="user",
            content=prompt
        )
        
        run = client.beta.threads.runs.create(
            thread_id=thread_id,
            assistant_id=ASSISTANT_ID
        )

        while True:
            run_status = client.beta.threads.runs.retrieve(thread_id=thread_id, run_id=run.id)
            if run_status.status == "completed":
                break

        messages = client.beta.threads.messages.list(thread_id=thread_id)
        assistant_message = messages.data[0].content[0].text.value

        st.chat_message("assistant").write(assistant_message)
        st.session_state.messages.append({"role": "assistant", "content": assistant_message})

    except Exception as e:
        st.error(f"Error: {str(e)}")