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

# ------------------ Authentication ------------------
VALID_USERS = {
    "andrew@lortechnologies.com": "Pass.123",
    "asherS@schlagergroup.com.au": "Pass.123",
    "daniel@schlagergroup.com.au": "Pass.123",
    "admin@schlagergroup.com.au": "Pass.123",
}

def login():
    st.title("🔐 Login Required")
    email = st.text_input("Email")
    password = st.text_input("Password", type="password")
    if st.button("Login"):
        if VALID_USERS.get(email) == password:
            st.session_state.authenticated = True
            st.rerun()
        else:
            st.error("❌ Incorrect email or password.")

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

if not st.session_state.authenticated:
    login()
    st.stop()

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

# ------------------ Load API Key ------------------
OPENAI_API_KEY = os.environ.get("OPENAI_API_KEY")
if not OPENAI_API_KEY:
    st.error("❌ Missing OPENAI_API_KEY environment variable.")
    st.stop()

client = OpenAI(api_key=OPENAI_API_KEY)

# ------------------ Tabs ------------------
tab1, tab2 = st.tabs(["📑 Contract", "📁 Technical"])

# ------------------ Contract Tab ------------------
with tab1:
    ASSISTANT_ID = "asst_KsQRedoJUnEeStzfox1o06lO"

    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

    with st.sidebar:
        st.header("ℹ️ Contract Tools")
        if st.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.pending_prompt = None
            st.rerun()

        show_image = st.toggle("📑 Show Page Image", value=True)
        keyword = st.text_input("Search by Keyword", placeholder="e.g. defects, WHS, delay")
        if st.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 = st.selectbox("📄 Jump to Section", section_options)
        if section != section_options[0]:
            st.session_state.pending_prompt = f"Summarize or list key points from section: {section}"

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

    chat_col, image_col = st.columns([2, 1])
    with chat_col:
        st.markdown("### 🧠 Ask a Document-Specific Question")
        user_input = st.chat_input("Example: What is the defects liability period?")
        if user_input:
            st.session_state.messages.append({"role": "user", "content": user_input})
        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=ASSISTANT_ID
                )

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

                if status.status == "completed":
                    messages = client.beta.threads.messages.list(thread_id=st.session_state.thread_id)
                    for m in reversed(messages.data):
                        if m.role == "assistant":
                            reply = m.content[0].text.value
                            st.session_state.messages.append({"role": "assistant", "content": reply})
                            match = re.search(r'Document Reference:\s*(.*?),\s*Page\s*(\d+)', reply)
                            if match:
                                doc, page = match.group(1).strip(), int(match.group(2))
                                folder = quote(doc)
                                img_url = f"https://raw.githubusercontent.com/AndrewLORTech/c2ozschlaegerforrestdale/main/{folder}/{folder}_page_{page:04d}.png"
                                st.session_state.image_url = img_url
                                st.session_state.image_updated = True
                            break
                else:
                    st.error("❌ Assistant failed.")
                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:
            try:
                r = requests.get(st.session_state.image_url)
                r.raise_for_status()
                img = Image.open(BytesIO(r.content))
                st.image(img, caption="📄 OCR Page Image", use_container_width=True)
            except Exception as e:
                st.error(f"🖼️ Image failed: {e}")

# ------------------ Technical Tab ------------------
with tab2:
    ASSISTANT_ID = "asst_DjvuWBc7tCvMbAhY7n1em4BZ"
    if "tech_messages" not in st.session_state:
        st.session_state.tech_messages = []
    if "tech_thread_id" not in st.session_state:
        st.session_state.tech_thread_id = None
    if "tech_results" not in st.session_state:
        st.session_state.tech_results = []
    st.session_state.tech_lightbox = None

    tech_input = st.chat_input("Ask about plans, drawings or components")
    if tech_input:
        st.session_state.tech_messages.append({"role": "user", "content": tech_input})

    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=ASSISTANT_ID
            )

            with st.spinner("🔍 Searching technical drawings..."):
                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":
                messages = client.beta.threads.messages.list(thread_id=st.session_state.tech_thread_id)
                for msg in reversed(messages.data):
                    if msg.role == "assistant":
                        content = msg.content[0].text.value
                        st.session_state.tech_messages.append({"role": "assistant", "content": content})
                        try:
                            st.session_state.tech_results = json.loads(content.strip("`json "))
                        except:
                            st.session_state.tech_results = []
                        break
        except Exception as e:
            st.error(f"❌ Technical Assistant Error: {e}")

    with st.expander("🔧 Options (Filter + Pagination)", expanded=False):
        disciplines = sorted(set(d.get("discipline", "") for d in st.session_state.tech_results))
        selected = st.selectbox("🌍 Filter by discipline", ["All"] + disciplines)
        page_size = 8
        page = st.number_input("Page", min_value=1, step=1, value=1)

    if st.session_state.tech_results:
        st.subheader("📂 Results")
        results = [r for r in st.session_state.tech_results if selected == "All" or r.get("discipline") == selected]
        paged = results[(page - 1) * page_size : page * page_size]
        cols = st.columns(4)
        for i, item in enumerate(paged):
            with cols[i % 4]:
                st.markdown(f"**📁 {item['drawing_number']} ({item['discipline']})**")
                st.caption(item.get("summary", ""))

                image_urls = item.get("images", [])
                if not image_urls:
                    st.warning("⚠️ No image available.")
                else:
                    url = image_urls[0]
                    st.caption(f"🔗 Image URL: {url}")
                    try:
                        st.image(url, caption=f"{item['drawing_number']} - Page 1", use_container_width=True)
                    except Exception as e:
                        st.error(f"❌ Could not load image: {e}")

                    if st.button("🖼️ View Drawing Details", key=f"thumb_{i}"):
                        st.session_state.tech_lightbox = url

        if st.session_state.tech_lightbox:
            st.image(st.session_state.tech_lightbox, caption="🔍 Enlarged Drawing Preview", use_container_width=True)
            if st.button("❌ Close Preview"):
                st.session_state.tech_lightbox = None
                st.rerun()
    else:
        for msg in st.session_state.tech_messages:
            with st.chat_message(msg["role"]):
                st.markdown(msg["content"], unsafe_allow_html=True)