app.py

import streamlit as st
from openai import OpenAI
import time
import datetime
import os

# Securely get credentials from Hugging Face secrets
generated_user = os.getenv("User")
generated_password = os.getenv("Password")
openai_key = os.getenv("openai_key")

# Streamlit app configuration
st.set_page_config(page_title="Carfind.co.za AI Assistant")
st.title("Carfind.co.za AI Assistant")
st.caption("Chat with Carfind.co.za and find your next car fast")

# Initialize authentication state
if "authenticated" not in st.session_state:
    st.session_state.authenticated = False

# Login screen
if not st.session_state.authenticated:
    st.subheader("Login")
    username = st.text_input("Username")
    password = st.text_input("Password", type="password")

    # Auto-login once both fields are filled
    if username and password:
        if username == generated_user and password == generated_password:
            st.session_state.authenticated = True
            st.success("Login successful! Redirecting...")
            time.sleep(1)
            st.rerun()
        else:
            st.error("Incorrect username or password. Please try again.")

# Main chat interface
else:
    st.divider()

    # Display chat history
    if "messages" not in st.session_state:
        st.session_state["messages"] = []

    for message in st.session_state.messages:
        role = message["role"]
        content = message["content"]
        st.chat_message(role).write(content)

    # Add Clear Chat button next to input field
    clear_col, input_col = st.columns([1, 8])
    with clear_col:
        if st.button("🧹 Clear Chat"):
            st.session_state.messages = []
            st.success("Chat history cleared.")

    with input_col:
        user_input = st.chat_input("Type your message here...")

    # Check for OpenAI key
    if openai_key:
        client = OpenAI(api_key=openai_key)
        ASSISTANT_ID = "asst_5gQR21fOsmHil11FGBzEArA7"

        # Save chat transcript (backend only)
        def save_transcript(messages):
            with open("chat_logs.txt", "a") as log:
                log.write(f"\n--- New Chat ({datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')}) ---\n")
                for msg in messages:
                    log.write(f"{msg['role'].capitalize()}: {msg['content']}\n")
                log.write("--- End Chat ---\n")

        # Handle user input and keep sticky experience
        if user_input:
            st.session_state.messages.append({"role": "user", "content": user_input})
            st.chat_message("user").write(user_input)

            try:
                # Start OpenAI chat thread
                thread = client.beta.threads.create()
                thread_id = thread.id

                # Send user message
                client.beta.threads.messages.create(
                    thread_id=thread_id,
                    role="user",
                    content=user_input
                )

                # Trigger assistant response
                run = client.beta.threads.runs.create(
                    thread_id=thread_id,
                    assistant_id=ASSISTANT_ID
                )

                # Wait for assistant completion
                while True:
                    run_status = client.beta.threads.runs.retrieve(
                        thread_id=thread_id,
                        run_id=run.id
                    )
                    if run_status.status == "completed":
                        break
                    time.sleep(1)

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

                # Display and store the assistant’s response
                st.chat_message("assistant").write(assistant_message)
                st.session_state.messages.append({"role": "assistant", "content": assistant_message})

                # Save chat log
                save_transcript(st.session_state.messages)

            except Exception as e:
                st.error(f"An error occurred: {str(e)}")
    else:
        st.error("OpenAI key not found. Please ensure it is set as a Hugging Face secret.")