import streamlit as st
import asyncio
import edge_tts
import time
import os
import uuid
import re
import html
import firebase_admin
from firebase_admin import credentials, firestore
from openai import OpenAI

# ---- Firebase setup ----
if not firebase_admin._apps:
    cred = credentials.Certificate("firebase-service-account.json")
    firebase_admin.initialize_app(cred)
db = firestore.client()

# ---- OpenAI setup ----
openai_key = os.getenv("openai_key")
assistant_id = os.getenv("assistant_id")
client = OpenAI(api_key=openai_key)

VOICE_OPTIONS = {
    "Jenny (US, Female)": "en-US-JennyNeural",
    "Aria (US, Female)": "en-US-AriaNeural",
    "Ryan (UK, Male)": "en-GB-RyanNeural",
    "Natasha (AU, Female)": "en-AU-NatashaNeural",
    "William (AU, Male)": "en-AU-WilliamNeural",
    "Libby (UK, Female)": "en-GB-LibbyNeural",
    "Leah (SA, Female)": "en-ZA-LeahNeural",
    "Luke (SA, Male)": "en-ZA-LukeNeural"
}

st.set_page_config(page_title="C2 Group AI Assistant", layout="wide")

# --- State setup
if "user_id" not in st.session_state:
    st.session_state["user_id"] = str(uuid.uuid4())
user_id = st.session_state["user_id"]

if "mute_voice" not in st.session_state:
    st.session_state["mute_voice"] = False
if "last_tts_text" not in st.session_state:
    st.session_state["last_tts_text"] = ""
if "last_audio_path" not in st.session_state:
    st.session_state["last_audio_path"] = ""
if "selected_voice" not in st.session_state:
    st.session_state["selected_voice"] = "Jenny (US, Female)"

# --- CSS ---
st.markdown("""
    <style>
    .block-container {padding-top: 1rem;}
    header {visibility: hidden;}
    .logo-mini {
        width: 75px !important;
        margin: 0 auto 0.25em auto;
        display: block;
    }
    .lor-brand-bar {
        width: 100vw;
        text-align: center;
        background: none;
        margin-bottom: 0.5em;
        margin-top: 0.1em;
        position: relative;
    }
    .clear-chat-btn-top {
        position: absolute;
        top: 10px;
        right: 50px;
        font-size: 1.4em;
        color: #ccc;
        background: none;
        border: none;
        cursor: pointer;
        z-index: 1000;
        transition: color 0.2s ease;
    }
    .clear-chat-btn-top:hover {
        color: #fff;
    }
    .stChatMessage { max-width: 85%; border-radius: 12px; padding: 8px; margin-bottom: 10px; }
    .stChatMessage[data-testid="stChatMessage-user"] { background: #f0f0f0; color: #000000; }
    .stChatMessage[data-testid="stChatMessage-assistant"] { background: #e3f2fd; color: #000000; }
    .chat-history-wrapper {
        margin-top: 0.5em;
        padding-bottom: 9em;
        min-height: 60vh;
    }
    .input-bottom-bar {
        position: fixed;
        bottom: 3.5em;
        width: 100%;
        background: #191b22;
        padding: 0.5em 0.6em;
        border-top: 1px solid #22232c;
        z-index: 999;
    }
    </style>
""", unsafe_allow_html=True)

# --- Top Branding + clear button ---
st.markdown("""
<div class="lor-brand-bar">
    <img src="https://i0.wp.com/c2group.co.za/wp-content/uploads/2022/10/cropped-1_C2-Group-Technologies-Logo-2-1.png?w=1024&ssl=1" class="logo-mini" />
    <div style="font-size: 13px; color: #888;">Powered by C2 Group</div>
    <button class="clear-chat-btn-top" onclick="window.location.href='?clear=1'">🗑️</button>
</div>
""", unsafe_allow_html=True)

# --- Sidebar: voice settings ---
with st.sidebar:
    st.markdown("### Voice Settings & Controls")
    selected_voice = st.selectbox(
        "Select assistant voice", list(VOICE_OPTIONS.keys()),
        index=list(VOICE_OPTIONS.keys()).index(st.session_state["selected_voice"])
    )
    st.session_state["selected_voice"] = selected_voice

    last_audio = st.session_state.get("last_audio_path")
    mute_voice = st.session_state.get("mute_voice", False)
    if last_audio and os.path.exists(last_audio):
        st.audio(last_audio, format="audio/mp3", autoplay=not mute_voice)
        if st.button("🔁 Replay Voice"):
            st.audio(last_audio, format="audio/mp3", autoplay=True)
    if not mute_voice:
        if st.button("🔇 Mute Voice"):
            st.session_state["mute_voice"] = True
            st.rerun()
    else:
        if st.button("🔊 Unmute Voice"):
            st.session_state["mute_voice"] = False
            st.rerun()

# --- Firestore helpers ---
def get_or_create_thread_id():
    doc_ref = db.collection("users").document(user_id)
    doc = doc_ref.get()
    if doc.exists:
        return doc.to_dict()["thread_id"]
    else:
        thread = client.beta.threads.create()
        doc_ref.set({"thread_id": thread.id, "created_at": firestore.SERVER_TIMESTAMP})
        return thread.id

def save_message(role, content):
    db.collection("users").document(user_id).collection("messages").add({
        "role": role,
        "content": content,
        "timestamp": firestore.SERVER_TIMESTAMP
    })

def clear_chat_history():
    user_doc_ref = db.collection("users").document(user_id)
    for msg in user_doc_ref.collection("messages").stream():
        msg.reference.delete()
    user_doc_ref.delete()
    st.session_state.clear()
    st.rerun()

def display_chat_history():
    messages = db.collection("users").document(user_id).collection("messages").order_by("timestamp").stream()
    assistant_icon_html = "<img src='https://img.freepik.com/free-vector/graident-ai-robot-vectorart_78370-4114.jpg?semt=ais_hybrid&w=740' width='22' style='vertical-align:middle; border-radius:50%;'/>"

    chat_msgs = []
    for msg in list(messages)[::-1]:
        data = msg.to_dict()
        if data["role"] == "user":
            chat_msgs.append(
                f"<div class='stChatMessage' data-testid='stChatMessage-user'>👤 <strong>You:</strong> {data['content']}</div>"
            )
        else:
            chat_msgs.append(
                f"<div class='stChatMessage' data-testid='stChatMessage-assistant'>{assistant_icon_html} <strong>C2 Assistant:</strong> {data['content']}</div>"
            )
    st.markdown('<div class="chat-history-wrapper">' + "".join(chat_msgs) + '</div>', unsafe_allow_html=True)
    st.markdown('<div id="chat-top-anchor"></div>', unsafe_allow_html=True)

# --- TTS sanitization ---
def sanitize_for_tts(text):
    text = html.unescape(text)
    text = re.sub(r'[^\x00-\x7F]+', ' ', text)
    text = re.sub(r'\[([^\]]+)\]\([^\)]+\)', r'\1', text)
    text = re.sub(r'(\*\*|__)(.*?)\1', r'\2', text)
    text = re.sub(r'(\*|_)(.*?)\1', r'\2', text)
    text = re.sub(r'^#{1,6}\s+', '', text, flags=re.MULTILINE)
    text = re.sub(r'^\s*[-*+]\s+', ' • ', text, flags=re.MULTILINE)
    text = re.sub(r'^\s*\d+\.\s+', ' • ', text, flags=re.MULTILINE)
    text = re.sub(r'[!?]{2,}', '.', text)
    text = re.sub(r'\.{3,}', '.', text)
    text = re.sub(r'\n{2,}', '. ', text)
    text = re.sub(r'\s+', ' ', text).strip()
    return text

# --- Edge TTS synth ---
async def edge_tts_synthesize(text, voice, user_id):
    out_path = f"output_{user_id}.mp3"
    communicate = edge_tts.Communicate(text, voice)
    await communicate.save(out_path)
    return out_path

def synthesize_voice(text, voice_key, user_id):
    voice = VOICE_OPTIONS[voice_key]
    out_path = f"output_{user_id}.mp3"
    if st.session_state["last_tts_text"] != text or not os.path.exists(out_path) or st.session_state.get("last_voice") != voice:
        with st.spinner(f"Generating voice ({voice_key})..."):
            asyncio.run(edge_tts_synthesize(text, voice, user_id))
        st.session_state["last_tts_text"] = text
        st.session_state["last_audio_path"] = out_path
        st.session_state["last_voice"] = voice
    return out_path

# --- CHAT DISPLAY ---
display_chat_history()

# --- Bottom chat input ---
with st.container():
    st.markdown('<div class="input-bottom-bar">', unsafe_allow_html=True)
    user_input = st.chat_input("Type your message here...")
    st.markdown('</div>', unsafe_allow_html=True)

# --- JS auto-scroll ---
st.markdown("""
<script>
window.onload = function() {
    var anchor = document.getElementById("chat-top-anchor");
    if(anchor){ anchor.scrollIntoView({ behavior: "smooth", block: "start" }); }
};
</script>
""", unsafe_allow_html=True)

# --- Handle clear button ---
if st.query_params.get("clear") == "1":
    clear_chat_history()

# --- Handle user input ---
if user_input:
    thread_id = get_or_create_thread_id()
    client.beta.threads.messages.create(thread_id=thread_id, role="user", content=user_input)
    save_message("user", user_input)
    with st.spinner("Thinking and typing... 💭"):
        run = client.beta.threads.runs.create(thread_id=thread_id, assistant_id=assistant_id)
        while True:
            run_status = client.beta.threads.runs.retrieve(thread_id=thread_id, run_id=run.id)
            if run_status.status == "completed":
                break
            time.sleep(1)
    messages_response = client.beta.threads.messages.list(thread_id=thread_id)
    latest_response = sorted(messages_response.data, key=lambda x: x.created_at)[-1]
    assistant_message = latest_response.content[0].text.value
    save_message("assistant", assistant_message)

    mute_voice = st.session_state.get("mute_voice", False)
    audio_path = None
    if not mute_voice and assistant_message.strip():
        clean_text = sanitize_for_tts(assistant_message)
        audio_path = synthesize_voice(clean_text, st.session_state["selected_voice"], user_id)
        st.session_state["last_audio_path"] = audio_path

    time.sleep(0.2)
    st.rerun()