"""Toy Data Feed Adapter for ArbSphere MVP.

Simulates a venue data feed producing LocalArbProblem and SharedSignals.
In a real deployment this would subscribe to market data across venues.
"""

from __future__ import annotations

import time
from typing import Optional

from arbsphere.primitives import LocalArbProblem, SharedSignals


def synth_local_arb_problem() -> LocalArbProblem:
    return LocalArbProblem(
        venue_id="VENUE-A",
        asset_pair=["AAPL", "MSFT"],
        target_mispricing=0.25,
        liquidity_budget=1_000_000.0,
        latency_budget_ms=5,
    )


def synth_shared_signals() -> SharedSignals:
    return SharedSignals(
        version=1,
        price_delta=0.12,
        cross_venue_correlations={"VENUE-A|VENUE-B": 0.85},
        available_borrow_liquidity=500_000.0,
    )


def stream_once() -> tuple[LocalArbProblem, SharedSignals | None]:  # pragma: no cover - integration helper
    lp = synth_local_arb_problem()
    ss = synth_shared_signals()
    return lp, ss