app.py

import streamlit as st
import os
import time
import re
import requests
from PIL import Image
from io import BytesIO
from urllib.parse import quote
from openai import OpenAI

# ------------------ App Configuration ------------------
st.set_page_config(page_title="Schlaeger Forrestdale DocAIA", layout="wide", initial_sidebar_state="collapsed")
st.title("📄 Schlaeger Forrestdale Document Assistant")
st.caption("Explore City of Armadale construction documents using AI + OCR 🧠")

# ------------------ Load API Key and Assistant IDs ------------------
OPENAI_API_KEY = os.environ.get("OPENAI_API_KEY")
CONTRACT_ASSISTANT_ID = os.environ.get("ASSISTANT_ID")  # Contract assistant
TECH_ASSISTANT_ID = "asst_DjvuWBc7tCvMbAhY7n1em4BZ"       # Technical drawings assistant

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

client = OpenAI(api_key=OPENAI_API_KEY)

# ------------------ Tabs ------------------
tab1, tab2 = st.tabs(["📄 Contract Assistant", "📐 Technical Drawings Assistant"])

# ------------------ Tab 1: Contract Assistant ------------------
with tab1:
    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 "pending_prompt" not in st.session_state:
        st.session_state.pending_prompt = None

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

    st.sidebar.subheader("📘 Document Tools")
    keyword = st.sidebar.text_input("Search by Keyword", placeholder="e.g. defects, WHS, delay")
    if st.sidebar.button("🔎 Search Keyword") and keyword:
        st.session_state.pending_prompt = 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. Specifications",
        "6. WHS Policies",
        "7. Penalties and Delays",
        "8. Dispute Resolution",
        "9. Principal Obligations"
    ]
    section_select = st.sidebar.selectbox("📄 Jump to Section", section_options)
    if section_select != section_options[0]:
        st.session_state.pending_prompt = f"Summarize or list key points from section: {section_select}"

    actions = [
        "Select an action...",
        "List all contractual obligations",
        "Summarize payment terms",
        "List WHS responsibilities",
        "Find delay-related penalties",
        "Extract dispute resolution steps"
    ]
    action_select = st.sidebar.selectbox("⚙️ Common Contract Queries", actions)
    if action_select != actions[0]:
        st.session_state.pending_prompt = action_select

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

    with chat_col:
        st.markdown("### 🧠 Ask a Document-Specific Question")
        user_prompt = st.chat_input("Example: What is the defects liability period?")

        if user_prompt:
            st.session_state.messages.append({"role": "user", "content": user_prompt})
        elif st.session_state.pending_prompt:
            st.session_state.messages.append({"role": "user", "content": st.session_state.pending_prompt})
            st.session_state.pending_prompt = None

        if st.session_state.messages and st.session_state.messages[-1]["role"] == "user":
            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=st.session_state.messages[-1]["content"]
                )

                run = client.beta.threads.runs.create(
                    thread_id=st.session_state.thread_id,
                    assistant_id=CONTRACT_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_reply = message.content[0].text.value
                            st.session_state.messages.append({"role": "assistant", "content": assistant_reply})

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

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

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

    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}")

# ------------------ Tab 2: Technical Drawing Assistant ------------------
with tab2:
    if "tech_messages" not in st.session_state:
        st.session_state.tech_messages = []
        st.session_state.tech_thread_id = None

    st.markdown("### 🏗️ Ask a Question About Drawings or Diagrams")
    tech_prompt = st.chat_input("Example: Show me all architectural drawings")

    if tech_prompt:
        st.session_state.tech_messages.append({"role": "user", "content": tech_prompt})

    if st.session_state.tech_messages and st.session_state.tech_messages[-1]["role"] == "user":
        try:
            if st.session_state.tech_thread_id is None:
                thread = client.beta.threads.create()
                st.session_state.tech_thread_id = thread.id

            client.beta.threads.messages.create(
                thread_id=st.session_state.tech_thread_id,
                role="user",
                content=st.session_state.tech_messages[-1]["content"]
            )

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

            with st.spinner("🔍 Querying Technical Drawing Assistant..."):
                while True:
                    run_status = client.beta.threads.runs.retrieve(
                        thread_id=st.session_state.tech_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.tech_thread_id)
                for message in reversed(messages.data):
                    if message.role == "assistant":
                        reply = message.content[0].text.value
                        st.session_state.tech_messages.append({"role": "assistant", "content": reply})
                        break

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

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