import json

from nova_plan.contracts import CaCContract, CaCRegistry, sign_ca_contract, crdt_merge_deltas, PlanDelta


def test_cac_contract_signing_and_serialization():
    c = CaCContract(contract_id="cac-001", version=1, content={"name": "NovaPlan", "purpose": "MVP"})
    signed = sign_ca_contract(c, key="topsecret")
    assert signed.signature is not None
    s = signed.to_json()
    # Ensure JSON can be parsed back without error
    parsed = json.loads(s)
    assert parsed.get("contract_id") == "cac-001"


def test_crdt_merge_deltas_basic():
    d1 = PlanDelta(agent_id="a1", delta={"x": 1.0}, timestamp=1.0)
    d2 = PlanDelta(agent_id="a2", delta={"y": 2.0}, timestamp=2.0)
    merged = crdt_merge_deltas(d1, d2)
    assert isinstance(merged, PlanDelta)
    assert "x" in merged.delta and "y" in merged.delta
    assert merged.timestamp == 2.0


def test_cac_registry_store_and_retrieve():
    c = CaCContract(contract_id="cac-002", version=1, content={"foo": "bar"})
    CaCRegistry.register(c)
    retrieved = CaCRegistry.get("cac-002")
    assert retrieved is c