"""The alert ledger: what the manager remembers across a restart."""

import pytest
from sqlalchemy import delete
from sqlmodel import Session

from fluksio.core.db import engine
from fluksio.flow.alert_ledger import AlertLedger
from fluksio.models import AlertSent


@pytest.fixture(autouse=True)
def _empty(db: Session):  # noqa: ARG001 - the schema has to exist first
    with Session(engine) as session:
        session.exec(delete(AlertSent))
        session.commit()
    yield


def test_a_sent_alert_comes_back_and_old_ones_are_pruned():
    ledger = AlertLedger()
    ledger.add("node_error:house.calc", 100.0, keep_since=0.0)
    ledger.add("node_health:house.mqtt", 5000.0, keep_since=1000.0)

    assert ledger.load(since=0.0) == [("node_health:house.mqtt", 5000.0)]
    assert ledger.load(since=6000.0) == []