app.py

# 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 = uri
        self.headers = headers
        self.client_id = 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"]

# WebSocket 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.strip()

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

def handle_chat(user_input, thread_id):
    if not OPENAI_API_KEY or not ASSISTANT_ID:
        return "❌ Missing secrets!", thread_id, "", None

    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
                match = re.search(
                    r'https://raw\.githubusercontent\.com/AndrewLORTech/surgical-pathology-manual/main/[\w\-/]*\.png',
                    content
                )
                image_url = match.group(0) if match else None
                response = f"### ❓ Question\n{user_input}\n\n---\n\n### 💡 Answer\n{content}"
                return response, thread_id, image_url

        return "No response from assistant.", thread_id, None

    except Exception as e:
        return f"❌ {e}", thread_id, None

def feed_transcript(transcript, thread_id, cid):
    if not transcript.strip():
        return gr.update(), thread_id, None
    if cid in connections:
        connections[cid].transcript = ""
    return handle_chat(transcript, thread_id,)

# ============ Gradio UI ============

with gr.Blocks(theme=gr.themes.Soft()) as app:
    gr.HTML("""
    <style>
    body {
        font-family: 'Inter', sans-serif;
        background-color: #f9f9fb;
    }
    .big-btn {
        font-size: 16px;
        padding: 12px 20px;
        border-radius: 12px;
        width: 100%;
        background-color: #4f46e5;
        color: white;
        border: none;
    }
    .voice-area {
        padding-top: 16px;
        margin-top: 16px;
        border-top: 1px solid #ddd;
    }
    </style>
    """)

    thread_state = gr.State()
    client_id = gr.State()

    with gr.Row(equal_height=True):
        with gr.Column(scale=1):
            user_input = gr.Textbox(placeholder="Ask your question...", label="Prompt")
            submit_btn = gr.Button("🚀 Ask", variant="primary")
            result_md = gr.Markdown()
            image_output = gr.Image(label="🖼️ Preview", type="filepath", show_download_button=False)

            with gr.Column(elem_classes="voice-area"):
                gr.Markdown("🎙️ Real-time Voice Input")
                voice_input = gr.Audio(label="Tap to Speak", streaming=True, type="numpy")
                transcript_box = gr.Textbox(label="Transcript", lines=2, interactive=False)

                voice_submit_btn = gr.Button("Send Voice", elem_classes="big-btn")
                clear_transcript_btn = gr.Button("🧹 Clear Transcript", elem_classes="big-btn")

        with gr.Column(scale=1.4):
            gr.Markdown("### ⏱️ Assistant Response")
            result_area = gr.Markdown()

    # Bindings
    submit_btn.click(fn=handle_chat,
                     inputs=[user_input, thread_state],
                     outputs=[result_area, thread_state, image_output])

    voice_input.stream(fn=send_audio,
                       inputs=[voice_input, client_id],
                       outputs=transcript_box,
                       stream_every=0.5)

    voice_submit_btn.click(fn=feed_transcript,
                           inputs=[transcript_box, thread_state, client_id],
                           outputs=[result_area, thread_state, image_output])

    clear_transcript_btn.click(fn=clear_transcript_only,
                               inputs=[client_id],
                               outputs=transcript_box)

    app.load(fn=create_ws, outputs=[client_id])

app.launch()