app/app.py

"""
Sentinel Arbitrage Engine - v14.0 FINAL (Socket.IO Multi-Asset)

The definitive version, combining a robust multi-asset detection engine
with a high-performance Socket.IO backend for guaranteed, real-time
signal delivery and a professional UI.
"""
import asyncio
import os
from contextlib import asynccontextmanager
import json
import time
from datetime import datetime, timezone

import httpx
import socketio
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from .price_fetcher import PriceFetcher
from .arbitrage_analyzer import ArbitrageAnalyzer

OPPORTUNITY_THRESHOLD = 0.0015

# --- Socket.IO Server Setup ---
sio = socketio.AsyncServer(async_mode='asgi', cors_allowed_origins='*')
socket_app = socketio.ASGIApp(sio)

@asynccontextmanager
async def lifespan(app: FastAPI):
    print("🚀 Initializing Sentinel Arbitrage Engine v14.0...")
    async with httpx.AsyncClient() as client:
        app.state.price_fetcher = PriceFetcher(client)
        app.state.arbitrage_analyzer = ArbitrageAnalyzer(client)
        
        arbitrage_task = asyncio.create_task(
            run_arbitrage_detector(app.state.price_fetcher, app.state.arbitrage_analyzer)
        )
        
        print("✅ Engine is online and hunting for opportunities.")
        yield
        
        print("⏳ Shutting down engine...")
        arbitrage_task.cancel()
        try: await arbitrage_task
        except asyncio.CancelledError: print("Engine shut down gracefully.")

async def run_arbitrage_detector(price_fetcher, analyzer):
    last_opportunity_time = 0
    while True:
        try:
            await price_fetcher.update_prices_async()
            all_prices = price_fetcher.get_all_prices()
            
            for asset, prices in all_prices.items():
                pyth_price = prices.get("pyth")
                chainlink_price = prices.get("chainlink_agg")
                
                if pyth_price and chainlink_price and pyth_price > 0:
                    spread = abs(pyth_price - chainlink_price) / chainlink_price
                    if spread > OPPORTUNITY_THRESHOLD:
                        current_time = time.time()
                        if current_time - last_opportunity_time > 20: # Throttle Gemini calls
                            last_opportunity_time = current_time
                            opportunity = {
                                "asset": asset, "pyth_price": pyth_price,
                                "chainlink_price": chainlink_price, "spread_pct": spread * 100
                            }
                            print(f"⚡️ Dislocation for {asset}: {opportunity['spread_pct']:.3f}%")
                            briefing = await analyzer.get_alpha_briefing(asset, opportunity)
                            if briefing:
                                signal = {**opportunity, **briefing, "timestamp": datetime.now(timezone.utc).isoformat()}
                                await sio.emit('new_signal', signal)
                                print(f"✅ Signal Emitted for {asset}: {signal['strategy']}")
        except Exception as e:
            print(f"❌ ERROR in engine loop: {e}")

        await asyncio.sleep(15)

# --- FastAPI App & Socket.IO Setup ---
app = FastAPI(lifespan=lifespan)

@sio.event
async def connect(sid, environ):
    print(f"✅ Client connected: {sid}")

@sio.event
async def disconnect(sid):
    print(f"🔥 Client disconnected: {sid}")

app.mount('/socket.io', socket_app)
app.mount("/", StaticFiles(directory="static", html=True), name="static")