from __future__ import annotations

import pytest

from datetime import datetime

from idea151_aidmesh_federated_privacy import models


def test_models_to_dict_and_immutability():
    lp = models.LocalProblem(
        id="lp-1",
        domain="shelter",
        assets={"tents": 100},
        objectives=["max_coverage"],
        constraints={"max_deploy": 50},
    )

    sd = models.SharedSignals(
        forecast={"demand": 120}, capacity_proxies={"depotA": 80}, privacy_budget=1.0, version=1
    )

    now = datetime.utcnow()
    pd = models.PlanDelta(
        delta={"alloc": {"depotA": 40}},
        timestamp=now,
        author="planner-1",
        contract_id="c-123",
        signature="sig",
    )

    al = models.AuditLog(entry="created", signer="alice", timestamp=now, contract_id="c-123", version=1)

    # to_dict should produce serializable dicts and timestamp should be ISO string
    assert lp.to_dict()["id"] == "lp-1"
    assert sd.to_dict()["version"] == 1
    assert isinstance(pd.to_dict()["timestamp"], str) and "T" in pd.to_dict()["timestamp"]
    assert isinstance(al.to_dict()["timestamp"], str) and "T" in al.to_dict()["timestamp"]

    # dataclasses are frozen: setting an attribute should raise
    with pytest.raises(Exception):
        lp.id = "other"