"""The dashboard SNMP widget (#5255): a verdict, devices that stopped answering
first, status in words, and key readings with their units."""
from datetime import datetime, timedelta, timezone

import pytest

from plugins.snmp.routes import key_readings, snmp_reading
from tests._templates import render_plugin_template


@pytest.mark.parametrize("label, value, says", [
    ("uptime_centisecs", 105_120_000, ("uptime", "12d 4h")),
    ("battery_charge_pct", 99.6, ("battery charge", "100%")),
    ("input_voltage_dV", 1203, ("input voltage", "120.3 V")),
    ("if1_in_octets", 1536, ("if1 in", "1.5 KiB total")),
    ("battery_status", 2, ("battery status", "2")),
    ("temperature", 41.25, ("temperature", "41.25")),
])
def test_a_reading_reads_with_its_unit(label, value, says):
    assert snmp_reading(label, value) == says


def test_key_readings_prefer_gauges_to_counters_in_config_order():
    oids = [{"oid": "a", "label": "if1_in_octets"}, {"oid": "b", "label": "uptime_centisecs"},
            {"oid": "c", "label": "if1_out_octets"}, {"oid": "1.2.3"}]
    readings = {"if1_in_octets": 10, "uptime_centisecs": 6000, "if1_out_octets": 20, "1.2.3": 7}
    assert [n for n, _ in key_readings(oids, readings)] == ["uptime", "1.2.3"]
    assert [n for n, _ in key_readings(oids[:1] + oids[2:3], readings)] == ["if1 in", "if1 out"]
    assert key_readings(oids, {}) == []


def _dev(name, reach, minutes_ago=None, key=()):
    at = datetime.now(timezone.utc) - timedelta(minutes=minutes_ago) if minutes_ago is not None else None
    return {"name": name, "reach": reach, "at": at, "readings": {}, "key": list(key)}


async def test_a_silent_device_leads_with_since_when(app):
    devices = [_dev("ups", "stale", 14, [("battery charge", "100%")]), _dev("printer", "pending"),
               _dev("switch", "up", 1, [("uptime", "12d 4h")])]
    async with app.test_request_context("/plugins/snmp/widget"):
        page = await render_plugin_template(app, "snmp", "snmp/widget.html", devices=devices, more=0,
                                            counts={"stale": 1, "pending": 1, "up": 1}, total=3)
    page = " ".join(page.split())
    assert "ups: no reply since" in page and ">14m ago<" in page
    assert page.count("<th>Device</th>") == 1
    assert page.index('title="ups"') < page.index('title="printer"') < page.index('title="switch"')
    assert "no data yet" in page and "uptime</span> 12d 4h" in page
    assert "detail →" not in page and "&#9675;" not in page


async def test_all_answering_says_so(app):
    async with app.test_request_context("/plugins/snmp/widget"):
        page = await render_plugin_template(app, "snmp", "snmp/widget.html",
                                            devices=[_dev("switch", "up", 1)], more=0,
                                            counts={"stale": 0, "pending": 0, "up": 1}, total=1)
    assert "All 1 device answering." in page and "—" in page