"""Time-series rows get time-ordered ids, so a new row lands at the right edge
of the primary-key index rather than on a random page of it (#5149)."""
import uuid

from steward.core import ids
from steward.core.ids import time_ordered_id
from steward.models.metrics import PluginMetric


def test_the_id_is_a_version_7_uuid_string():
    raw = time_ordered_id()
    u = uuid.UUID(raw)
    assert len(raw) == 36 and str(u) == raw
    assert u.version == 7 and u.variant == uuid.RFC_4122


def test_ids_sort_by_the_millisecond_they_were_made(monkeypatch):
    made = []
    for ms in (1_791_327_000_000, 1_791_327_000_001, 1_791_327_060_000):
        monkeypatch.setattr(ids.time, "time_ns", lambda ms=ms: ms * 1_000_000)
        made.append(time_ordered_id())
    assert made == sorted(made)
    assert len({m[:13] for m in made}) == 3     # the timestamp leads the string


def test_two_ids_in_one_millisecond_differ(monkeypatch):
    monkeypatch.setattr(ids.time, "time_ns", lambda: 1_791_327_000_000 * 1_000_000)
    assert time_ordered_id() != time_ordered_id()


def test_plugin_metrics_use_it():
    # SQLAlchemy wraps a no-argument default as fn(context); call it as it would.
    made = PluginMetric.__table__.c.id.default.arg(None)
    assert uuid.UUID(made).version == 7