from datetime import datetime

from idea151_aidmesh_federated_privacy.core import DeltaSyncEngine


def test_delta_sync_engine_basic():
    engine = DeltaSyncEngine(contract_id="c-42")
    delta1 = {"action": "allocate", "lp": "lp-1", "amount": 10}
    d1 = engine.create_delta(delta1, author="org-a")
    assert d1.contract_id == "c-42"
    # replay from 0 should include delta1
    replay = engine.replay_from(0)
    assert len(replay) == 1
    assert replay[0].delta["action"] == "allocate"

    delta2 = {"action": "route", "lp": "lp-2", "distance": 20}
    d2 = engine.create_delta(delta2, author="org-b")
    assert engine.log[-1].author == "org-b"
    assert len(engine.log) == 2