"""Starter adapter: Venue A (simulated FIX/WebSocket/REST feed)."""
from __future__ import annotations

from datetime import datetime, timedelta
from typing import Dict
from mercurymesh.contracts import MarketSignal


class VenueAAdapter:
    name = "venue-a"

    def __init__(self) -> None:
        self._start = datetime.utcnow()

    def extract_signal(self) -> MarketSignal:
        now = datetime.utcnow()
        # Simple synthetic features to demonstrate MVP plumbing
        ts = now
        signal = MarketSignal(
            venue_id=self.name,
            symbol="ABC",
            timestamp=ts,
            features={
                "liquidity_proxy": max(0.0, (ts - self._start).total_seconds()),
                "order_flow_intensity": 0.5,
                "volatility_proxy": 0.1 + (ts.second % 5) * 0.01,
            },
        )
        return signal