"""Settings → System (#5467): Steward's own health, a verdict then each measure
now and over the day. The verdict names what is wrong, and only that."""
from datetime import datetime, timezone

import pytest
from quart import render_template, session

from steward.core import health

AT = datetime(2026, 10, 9, 12, 0, tzinfo=timezone.utc)


def _previews(**over):
    base = {m: {"now": 0.0, "at": AT, "series": [0.0, 0.0], "low": 0.0, "high": 0.0}
            for m in health.PROCESS_METRICS}
    base["db_roundtrip_ms"] = {"now": 4.0, "at": AT, "series": [3.0, 5.0], "low": 2.0, "high": 9.0}
    for m, v in over.items():
        base[m] = {**base[m], **v}
    return base


@pytest.fixture
def previews(monkeypatch):
    def use(**over):
        got = _previews(**over)

        async def fake(db, source, resource, metric, now=None):
            assert (source, resource) == ("steward", "process")
            return got[metric]
        monkeypatch.setattr("steward.alerts.service.metric_preview", fake)
    return use


async def test_a_healthy_steward_has_no_problems(previews):
    previews()
    got = await health.process_health(None)
    assert got["seen"] and got["problems"] == []
    assert [r["metric"] for r in got["rows"]] == health.PROCESS_METRICS


async def test_failures_and_gaps_are_named(previews):
    previews(ingest_failed={"now": 2.0, "high": 2.0}, unwatched_secs={"high": 420.0},
             open_fds_pct={"now": 85.0})
    problems = (await health.process_health(None))["problems"]
    assert problems[0] == "2 agent posts failed in the last minute"
    assert "wasn't watching for up to 7m" in problems[1]
    assert problems[2] == "open files at 85% of the limit"


async def test_the_page_reads_as_a_verdict_then_each_measure(app, previews):
    previews(unwatched_secs={"high": 420.0})
    got = await health.process_health(None)
    for r in got["rows"]:
        r["spark"] = ""
    async with app.test_request_context("/settings/system/"):
        session["user_role"] = "admin"
        page = " ".join((await render_template("settings/system.html", **got)).split())
    assert '<span class="tone-warn">Steward wasn\'t watching for up to 7m' in page
    assert "Database round trip" in page and "4 ms" in page and "2 ms – 9 ms" in page
    assert page.index("page-verdict") < page.index("Agent posts per minute")