app.py

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

# Get environment variables
generated_user = os.getenv("User")
generated_password = os.getenv("Password")
openai_key = os.getenv("openai_key")
assistant_id = os.getenv("ASSISTANT_ID")

# Load or create transcript file
transcript_file = "transcripts.xlsx"
if not os.path.exists(transcript_file):
    df = pd.DataFrame(columns=["timestamp", "thread_id", "role", "message"])
    df.to_excel(transcript_file, index=False)

# Function to append to transcript
def append_to_transcript(thread_id, role, message):
    df_existing = pd.read_excel(transcript_file)
    new_entry = pd.DataFrame({
        "timestamp": [datetime.now().strftime("%Y-%m-%d %H:%M:%S")],
        "thread_id": [thread_id],
        "role": [role],
        "message": [message]
    })
    updated_df = pd.concat([df_existing, new_entry], ignore_index=True)
    updated_df.to_excel(transcript_file, index=False)

# Streamlit UI setup
st.set_page_config(page_title="Carfind.co.za AI Assistant", layout="wide")
st.markdown("<h1 style='text-align: center;'>🚗 Carfind.co.za AI Assistant</h1>", unsafe_allow_html=True)
st.caption("Chat with Carfind.co.za and find your next car fast")

st.markdown("""
    <style>
    .stChatMessage { max-width: 85%; border-radius: 12px; padding: 8px; }
    .stChatMessage[data-testid="stChatMessage-user"] { background: #f0f0f0; color: #000000; }
    .stChatMessage[data-testid="stChatMessage-assistant"] { background: #D6E9FE; color: #000000; }
    </style>
""", unsafe_allow_html=True)

if "authenticated" not in st.session_state:
    st.session_state.authenticated = False

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

    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.")
else:
    st.divider()

    if "thread_id" not in st.session_state:
        st.session_state["thread_id"] = None

    input_col, clear_col = st.columns([8, 1])
    with input_col:
        user_input = st.text_input("Type your message here...", key="chat_input")

    with clear_col:
        if st.button("🗑️", help="Clear Chat"):
            st.session_state["thread_id"] = None
            st.success("Chat cleared.")
            st.rerun()

    if openai_key and assistant_id:
        client = OpenAI(api_key=openai_key)

        if user_input:
            # Create thread if not exists
            if not st.session_state["thread_id"]:
                thread = client.beta.threads.create()
                st.session_state["thread_id"] = thread.id

            # Add user message
            client.beta.threads.messages.create(
                thread_id=st.session_state["thread_id"], role="user", content=user_input
            )
            append_to_transcript(st.session_state["thread_id"], "user", user_input)

            try:
                with st.spinner("Thinking and typing... 💭"):
                    run = client.beta.threads.runs.create(
                        thread_id=st.session_state["thread_id"], assistant_id=assistant_id
                    )
                    while True:
                        run_status = client.beta.threads.runs.retrieve(
                            thread_id=st.session_state["thread_id"], run_id=run.id
                        )
                        if run_status.status == "completed":
                            break
                        time.sleep(1)

                # Get full conversation
                messages_response = client.beta.threads.messages.list(
                    thread_id=st.session_state["thread_id"]
                )

                assistant_icon_html = "<img src='https://www.carfind.co.za/images/Carfind-Icon.svg' width='22' style='vertical-align:middle;'/>"

                # Display newest-first
                messages_sorted = sorted(messages_response.data, key=lambda x: x.created_at, reverse=True)
                for msg in messages_sorted:
                    if msg.role == "user":
                        st.markdown(
                            f"<div style='background-color:#f0f0f0; color:#000000; padding:10px; border-radius:8px; margin:5px 0;'>"
                            f"👤 <strong>You:</strong> {msg.content[0].text.value}"
                            f"</div>", 
                            unsafe_allow_html=True
                        )
                    else:
                        response_text = msg.content[0].text.value
                        append_to_transcript(st.session_state["thread_id"], "assistant", response_text)
                        st.markdown(
                            f"<div style='background-color:#D6E9FE; color:#000000; padding:10px; border-radius:8px; margin:5px 0;'>"
                            f"{assistant_icon_html} <strong>Carfind Assistant:</strong> {response_text}"
                            f"</div>", 
                            unsafe_allow_html=True
                        )

                # Scroll to top automatically
                st.markdown("""
                    <script>
                        window.scrollTo(0, 0);
                    </script>
                """, unsafe_allow_html=True)

            except Exception as e:
                st.error(f"An error occurred: {str(e)}")
    else:
        st.error("⚠️ OpenAI key or Assistant ID not found. Please ensure both are set as Hugging Face secrets.")