"""Golden verae-meta-git/1 ids shared with node-red-contrib-verae."""

from verae_mcp_timestamping_server.metadata_history import append_metadata

HEAD_1 = "161ff3344ba776ae7201b73914c0e7500116ac9dde02e1967a761b7089c41fa7"
HEAD_2 = "c606e41ccbf4c0f9f653b21759df83ecda25262621075db3a153b592270fd918"


def test_append_matches_node_reference():
    first = append_metadata(
        None,
        {"title": "deed", "tags": ["a"]},
        restamp=False,
        at="2026-10-11T01:00:00.000Z",
        message="stamp",
    )
    assert first["head"] == HEAD_1
    second = append_metadata(
        first,
        {"title": "deed-2", "tags": ["b"], "place": "office"},
        restamp=True,
        at="2026-10-11T02:00:00.000Z",
        message="correct the title",
    )
    assert second["head"] == HEAD_2
    assert second["snapshot"] == {"title": "deed-2", "tags": ["a", "b"], "place": "office"}
    assert second["commits"][1]["parent"] == HEAD_1
    assert "removed" not in second["commits"][1]["changes"]


def test_blank_restamp_keeps_snapshot():
    nxt = append_metadata(
        {"title": "deed", "note": "keep", "tags": ["a"]},
        {"title": "", "note": None, "tags": []},
        restamp=True,
        at="2026-10-11T01:47:00.000Z",
        prior_at="2026-10-11T01:00:00.000Z",
    )
    assert nxt["snapshot"]["title"] == "deed"
    assert nxt["snapshot"]["note"] == "keep"
    assert nxt["snapshot"]["tags"] == ["a"]
    assert len(nxt["commits"]) == 2


def test_omit_when_empty():
    assert append_metadata(None, None, restamp=False, at="2026-10-11T01:00:00.000Z") is None
    assert append_metadata(None, {}, restamp=False, at="2026-10-11T01:00:00.000Z") is None


def test_history_document_is_not_rewritten_by_append_of_itself():
    first = append_metadata(
        None,
        {"title": "deed", "tags": ["a"]},
        restamp=False,
        at="2026-10-11T01:00:00.000Z",
        message="stamp",
    )
    assert first["schema"] == "verae-meta-git/1"
    assert first["commits"][0]["parent"] is None