app.py

import streamlit as st
import os
import time
import re
import requests
from PIL import Image
from io import BytesIO
from openai import OpenAI

# ------------------ App Configuration ------------------
st.set_page_config(page_title="Schlaeger Forrestdale DocAIA", layout="wide")
st.title("📄 Schlaeger Forrestdale Document Assistant")
st.caption("Chat with construction documents using OCR-based AI")

# ------------------ Load API Key and Assistant ID ------------------
OPENAI_API_KEY = os.environ.get("OPENAI_API_KEY")
ASSISTANT_ID = os.environ.get("ASSISTANT_ID")

if not OPENAI_API_KEY or not ASSISTANT_ID:
    st.error("❌ Missing secrets. Please set both OPENAI_API_KEY and ASSISTANT_ID in Hugging Face Space secrets.")
    st.stop()

client = OpenAI(api_key=OPENAI_API_KEY)

# ------------------ Session State Initialization ------------------
if "messages" not in st.session_state:
    st.session_state.messages = []
if "thread_id" not in st.session_state:
    st.session_state.thread_id = None
if "image_url" not in st.session_state:
    st.session_state.image_url = None
if "image_updated" not in st.session_state:
    st.session_state.image_updated = False

# ------------------ Sidebar ------------------
st.sidebar.header("⚙️ Settings")
if st.sidebar.button("🧹 Clear Chat"):
    st.session_state.messages = []
    st.session_state.thread_id = None
    st.session_state.image_url = None
    st.session_state.image_updated = False
    st.rerun()

show_image = st.sidebar.toggle("📑 Show Page Image", value=True)

# ------------------ Layout ------------------
image_col, chat_col = st.columns([1, 2])

# ------------------ Image Viewer ------------------
with image_col:
    if show_image and st.session_state.image_url:
        with st.spinner("Loading document preview..."):
            try:
                response = requests.get(st.session_state.image_url)
                response.raise_for_status()
                img = Image.open(BytesIO(response.content))
                st.image(img, caption="📄 OCR Page Image", use_container_width=True)
                st.session_state.image_updated = False
            except Exception as e:
                st.error(f"❗ Failed to load image: {e}")

# ------------------ Chat Interface ------------------
with chat_col:
    st.markdown("### 🧠 Ask a Question or Choose Below")
    prompt = st.chat_input("What would you like to ask about the construction documents?")

    # Quick Action Buttons
    st.markdown("#### ⚡ Quick Prompts")
    quick_cols = st.columns(3)
    with quick_cols[0]:
        if st.button("🔍 Summary Mode"):
            prompt = "Summarize this section."
    with quick_cols[1]:
        if st.button("📘 FAQ Mode"):
            prompt = "Generate FAQs from this section."
    with quick_cols[2]:
        if st.button("🧾 Compliance Info"):
            prompt = "What are the safety and compliance measures?"

    # Display Message History
    for msg in st.session_state.messages:
        with st.chat_message(msg["role"]):
            st.markdown(msg["content"])

    if prompt:
        st.session_state.messages.append({"role": "user", "content": prompt})
        try:
            if st.session_state.thread_id is None:
                thread = client.beta.threads.create()
                st.session_state.thread_id = thread.id

            client.beta.threads.messages.create(thread_id=st.session_state.thread_id, role="user", content=prompt)

            run = client.beta.threads.runs.create(thread_id=st.session_state.thread_id, assistant_id=ASSISTANT_ID)

            with st.spinner("🤖 Processing your query..."):
                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)

            messages = client.beta.threads.messages.list(thread_id=st.session_state.thread_id)
            for message in reversed(messages.data):
                if message.role == "assistant":
                    assistant_message = message.content[0].text.value
                    st.session_state.messages.append({"role": "assistant", "content": assistant_message})
                    break

            match = re.search(r'Document Reference:\s+(.+?),\s+Page\s+(\d+)', assistant_message)
            if match:
                doc_name = match.group(1).strip()
                page = int(match.group(2))
                page_str = f"{page:04d}"
                image_url = f"https://raw.githubusercontent.com/AndrewLORTech/c2ozschlaegerforrestdale/main/{doc_name}/{doc_name}_page_{page_str}.png"
                st.session_state.image_url = image_url
                st.session_state.image_updated = True

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