from __future__ import annotations


def test_change_set_state_machine_separates_canonical_and_projection_completion():
    from app.core.knowledge.publish import ChangeSetStateMachine

    machine = ChangeSetStateMachine()
    state = "pending"
    for target in (
        "diffed",
        "building",
        "validating",
        "canonical_active",
        "projecting",
        "complete",
    ):
        state = machine.transition(state, target)
    assert state == "complete"


def test_change_set_cannot_activate_when_impact_was_truncated():
    import pytest

    from app.core.knowledge.publish import ChangeSetStateMachine

    machine = ChangeSetStateMachine()
    with pytest.raises(ValueError, match="truncated"):
        machine.transition("validating", "canonical_active", impact_truncated=True)


def test_change_set_rejects_invalid_transition():
    import pytest

    from app.core.knowledge.publish import ChangeSetStateMachine

    with pytest.raises(ValueError, match="invalid knowledge change-set transition"):
        ChangeSetStateMachine().transition("pending", "complete")