app.py

import gradio as gr
import os, time, re, json, base64, asyncio, threading, uuid, io
import numpy as np
import soundfile as sf
from pydub import AudioSegment
from openai import OpenAI
from websockets import connect
from dotenv import load_dotenv

# ============ Load Secrets ============
load_dotenv()
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
ASSISTANT_ID = os.getenv("ASSISTANT_ID")
client = OpenAI(api_key=OPENAI_API_KEY)

HEADERS = {"Authorization": f"Bearer {OPENAI_API_KEY}", "OpenAI-Beta": "realtime=v1"}
WS_URI = "wss://api.openai.com/v1/realtime?intent=transcription"
connections = {}

# ============ WebSocket Client ============
class WebSocketClient:
    def __init__(self, uri, headers, client_id):
        self.uri, self.headers, self.client_id = uri, headers, client_id
        self.websocket = None
        self.queue = asyncio.Queue(maxsize=10)
        self.transcript = ""
        self.loop = asyncio.new_event_loop()

    async def connect(self):
        try:
            self.websocket = await connect(self.uri, additional_headers=self.headers)
            with open("openai_transcription_settings.json", "r") as f:
                await self.websocket.send(f.read())
            await asyncio.gather(self.receive_messages(), self.send_audio_chunks())
        except Exception as e:
            print(f"🔴 WebSocket Connection Failed: {e}")

    def run(self):
        asyncio.set_event_loop(self.loop)
        self.loop.run_until_complete(self.connect())

    def enqueue_audio_chunk(self, sr, arr):
        if not self.queue.full():
            asyncio.run_coroutine_threadsafe(self.queue.put((sr, arr)), self.loop)

    async def send_audio_chunks(self):
        while True:
            sr, arr = await self.queue.get()
            if arr.ndim > 1:
                arr = arr.mean(axis=1)
            if np.max(np.abs(arr)) > 0:
                arr = arr / np.max(np.abs(arr))
            int16 = (arr * 32767).astype(np.int16)
            buf = io.BytesIO()
            sf.write(buf, int16, sr, format='WAV', subtype='PCM_16')
            audio = AudioSegment.from_file(buf, format="wav").set_frame_rate(24000)
            out = io.BytesIO()
            audio.export(out, format="wav")
            out.seek(0)
            await self.websocket.send(json.dumps({
                "type": "input_audio_buffer.append",
                "audio": base64.b64encode(out.read()).decode()
            }))

    async def receive_messages(self):
        async for msg in self.websocket:
            data = json.loads(msg)
            if data["type"] == "conversation.item.input_audio_transcription.delta":
                self.transcript += data["delta"]

# ============ Connection Manager ============
def create_ws():
    cid = str(uuid.uuid4())
    client = WebSocketClient(WS_URI, HEADERS, cid)
    threading.Thread(target=client.run, daemon=True).start()
    connections[cid] = client
    return cid

def send_audio(chunk, cid):
    if not cid or cid not in connections:
        return "Connecting..."
    sr, arr = chunk
    connections[cid].enqueue_audio_chunk(sr, arr)
    return connections[cid].transcript

def clear_transcript(cid):
    if cid in connections:
        connections[cid].transcript = ""
    return ""

# ============ Chat Assistant ============
def handle_chat(user_input, history, thread_id, image_url):
    if not OPENAI_API_KEY or not ASSISTANT_ID:
        return "❌ Missing secrets!", history, thread_id, image_url

    try:
        if thread_id is None:
            thread = client.beta.threads.create()
            thread_id = thread.id

        client.beta.threads.messages.create(thread_id=thread_id, role="user", content=user_input)
        run = client.beta.threads.runs.create(thread_id=thread_id, assistant_id=ASSISTANT_ID)

        while True:
            status = client.beta.threads.runs.retrieve(thread_id=thread_id, run_id=run.id)
            if status.status == "completed":
                break
            time.sleep(1)

        msgs = client.beta.threads.messages.list(thread_id=thread_id)
        for msg in reversed(msgs.data):
            if msg.role == "assistant":
                content = msg.content[0].text.value
                history.append((user_input, content))
                match = re.search(
                    r'https://raw\.githubusercontent\.com/AndrewLORTech/surgical-pathology-manual/main/[\w\-/]*\.png',
                    content
                )
                if match:
                    image_url = match.group(0)
                break

        return "", history, thread_id, image_url

    except Exception as e:
        return f"❌ {e}", history, thread_id, image_url

# ============ Auto-Send Voice Toggle ============
def maybe_send_transcript(transcript, history, thread_id, image_url, voice_only_enabled, client_id):
    if voice_only_enabled and transcript.strip():
        # Clear transcript after sending
        if client_id in connections:
            connections[client_id].transcript = ""
        return handle_chat(transcript, history, thread_id, image_url)
    return transcript, history, thread_id, image_url

# ============ Gradio UI ============
with gr.Blocks(theme=gr.themes.Soft()) as app:
    gr.Markdown("# 📄 Document AI Assistant")

    # STATES
    chat_state = gr.State([])
    thread_state = gr.State()
    image_state = gr.State()
    client_id = gr.State()
    voice_enabled = gr.State(False)
    voice_only_state = gr.State(True)

    with gr.Row(equal_height=True):
        with gr.Column(scale=1):
            image_display = gr.Image(label="🖼️ Document", type="filepath", show_download_button=False)

        with gr.Column(scale=1.4):
            chat = gr.Chatbot(label="💬 Chat", height=460)

            with gr.Row():
                user_prompt = gr.Textbox(placeholder="Ask your question...", show_label=False, scale=6)
                mic_toggle_btn = gr.Button("🎙️", scale=1)
                send_btn = gr.Button("Send", variant="primary", scale=2)

            with gr.Accordion("🎤 Voice Transcription", open=False) as voice_section:
                with gr.Row():
                    voice_input = gr.Audio(label="Mic", streaming=True)
                    voice_transcript = gr.Textbox(label="Transcript", lines=2, interactive=False)
                clear_btn = gr.Button("🧹 Clear Transcript")
                voice_only_toggle = gr.Checkbox(label="Voice-Only Mode 🎤➡️💬", value=True)

    # UI Event Bindings
    def toggle_voice(curr):
        return not curr, gr.update(visible=not curr)

    mic_toggle_btn.click(fn=toggle_voice, inputs=voice_enabled, outputs=[voice_enabled, voice_section])
    send_btn.click(fn=handle_chat,
                   inputs=[user_prompt, chat_state, thread_state, image_state],
                   outputs=[user_prompt, chat, thread_state, image_state])
    image_state.change(fn=lambda x: x, inputs=image_state, outputs=image_display)

    # Real-time audio streaming
    voice_input.stream(fn=send_audio, inputs=[voice_input, client_id], outputs=voice_transcript, stream_every=0.5)
    clear_btn.click(fn=clear_transcript, inputs=[client_id], outputs=voice_transcript)

    # Auto-send voice transcript if Voice-Only Mode is enabled
    voice_input.change(
        fn=maybe_send_transcript,
        inputs=[voice_transcript, chat_state, thread_state, image_state, voice_only_state, client_id],
        outputs=[user_prompt, chat, thread_state, image_state]
    )

    voice_only_toggle.change(fn=lambda x: x, inputs=voice_only_toggle, outputs=voice_only_state)

    # Initialize WebSocket connection
    app.load(fn=create_ws, outputs=[client_id])

app.launch()