from mercuriusmesh.simulator import DeterministicSimulator
from mercuriusmesh.adapters import ToyVenueAdapter
from mercuriusmesh.contracts import OrderEvent


def test_deterministic_replay():
    sim = DeterministicSimulator()
    a = ToyVenueAdapter("V1", initial_bid=100.0, initial_ask=100.5)
    b = ToyVenueAdapter("V2", initial_bid=99.8, initial_ask=100.3)
    sim.add_adapter(a)
    sim.add_adapter(b)

    o1 = OrderEvent(order_id="o1", venue_id="V1", asset="TEST/USD", side="buy", price=None, size=1)
    o2 = OrderEvent(order_id="o2", venue_id="V2", asset="TEST/USD", side="sell", price=None, size=2)

    sim.submit_order(o1)
    sim.submit_order(o2)

    # snapshot state
    s1 = sim.compute_shared_signals()

    # replay and compare
    sim.replay()
    s2 = sim.compute_shared_signals()

    assert s1.mid_price == s2.mid_price
    assert s1.liquidity == s2.liquidity