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("Explore technical construction documents via AI with OCR references")

# ------------------ 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
if "search_history" not in st.session_state:
    st.session_state.search_history = []
if "run_in_progress" not in st.session_state:
    st.session_state.run_in_progress = False

# ------------------ Sidebar (Left Utility Panel) ------------------
st.sidebar.header("ℹ️ Information")
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.session_state.search_history = []
    st.session_state.run_in_progress = False
    st.rerun()

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

st.sidebar.markdown("### 🔍 Navigate or Query Document")
keyword = st.sidebar.text_input("Jump to clause keyword or term", placeholder="e.g. defects, payment, WHS")
if st.sidebar.button("🔎 Search Keyword") and keyword:
    st.session_state.search_history.append(keyword)
    if not st.session_state.run_in_progress:
        st.session_state.messages.append({"role": "user", "content": f"Find clauses or references related to: {keyword}"})

section_options = [
    "Select a section...",
    "1. Formal Instrument of Contract",
    "2. Offer and Acceptance",
    "3. Key Personnel",
    "4. Contract Pricing",
    "5. Contract Specifications",
    "6. WHS Policies",
    "7. Penalties and Delays",
    "8. Dispute Resolution",
    "9. Principal Obligations"
]
selected_section = st.sidebar.selectbox("📄 Browse Sections", section_options)
if selected_section and selected_section != section_options[0]:
    st.session_state.messages.append({"role": "user", "content": f"Summarize or list key points from section: {selected_section}"})

actions = [
    "Select an action...",
    "List all contractual obligations",
    "Summarize payment terms",
    "List WHS responsibilities",
    "Find delay-related penalties",
    "Extract dispute resolution steps"
]
selected_action = st.sidebar.selectbox("⚙️ Common Actions", actions)
if selected_action and selected_action != actions[0]:
    st.session_state.messages.append({"role": "user", "content": selected_action})

if st.session_state.search_history:
    st.sidebar.markdown("---")
    st.sidebar.markdown("#### 🔁 Recent Searches")
    for term in reversed(st.session_state.search_history[-5:]):
        st.sidebar.markdown(f"- {term}")

if show_image and st.session_state.image_url:
    st.sidebar.markdown("---")
    st.sidebar.markdown("#### 🖼️ Page Image (Toggle)")
    try:
        response = requests.get(st.session_state.image_url)
        response.raise_for_status()
        img = Image.open(BytesIO(response.content))
        st.sidebar.image(img, caption="OCR Page", use_container_width=True)
    except Exception as e:
        st.sidebar.error(f"❗ Failed to load image: {e}")

# ------------------ Center Panel: Chat ------------------
st.markdown("### 🧠 Ask a Document-Specific Question")
prompt = st.chat_input("Example: What is the defects liability period?")

for msg in st.session_state.messages:
    with st.chat_message(msg["role"]):
        st.markdown(msg["content"], unsafe_allow_html=True)

if prompt and not st.session_state.run_in_progress:
    st.session_state.messages.append({"role": "user", "content": prompt})
    st.session_state.run_in_progress = True

    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("🤖 Parsing and responding with referenced content..."):
            while True:
                run_status = client.beta.threads.runs.retrieve(thread_id=st.session_state.thread_id, run_id=run.id)
                if run_status.status in ("completed", "failed", "cancelled"):
                    break
                time.sleep(1)

        if run_status.status != "completed":
            st.error(f"⚠️ Assistant failed: {run_status.status}")
        else:
            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.session_state.run_in_progress = False
        st.rerun()
    except Exception as e:
        st.session_state.run_in_progress = False
        st.error(f"❌ Error: {e}")