"""The supplies dashboard card must not report "nothing low" when it cannot see.

_get_low_supplies_data returned the same empty result for three different
situations - Zabbix not configured, Zabbix unreachable, and every cartridge
full - so the dashboard displayed "Low Supplies 0 / Critical 0" while the
monitoring was dead. That is not a missing feature; it is a wrong statement, and
it reads as reassurance.

These pin the three cases apart.
"""
from unittest.mock import patch

import pytest

from shopdb.api import db
from shopdb.core.models import Setting


def _call(client, auth_headers):
    response = client.get('/api/printers/dashboard/supplies', headers=auth_headers)
    assert response.status_code == 200
    return response.get_json()['data']


class FakeService:
    def __init__(self, configured, reachable):
        self.isconfigured = configured
        self.isreachable = reachable


@pytest.fixture(autouse=True)
def _clear_cache(app):
    from shopdb.extensions import cache
    cache.delete('printers_low_supplies')
    yield
    cache.delete('printers_low_supplies')


def test_unreachable_says_so_rather_than_reporting_zero(client, auth_headers):
    """Configured and unanswerable: the cartridges are NOT known to be fine."""
    with patch('plugins.printers.api.asset_routes.ZabbixService',
               return_value=FakeService(configured=True, reachable=False)):
        data = _call(client, auth_headers)

    assert data['rows'] == []
    assert data['unavailable'] == 'Supply monitoring is not reachable'


def test_unconfigured_stays_quiet(client, auth_headers):
    """The site did not ask for supply monitoring.

    A permanent "not configured" line would be a card reporting nothing wrong
    every day, which is how a board teaches people to stop reading it. It has
    nothing to say, so it says nothing and the card hides.
    """
    with patch('plugins.printers.api.asset_routes.ZabbixService',
               return_value=FakeService(configured=False, reachable=False)):
        data = _call(client, auth_headers)

    assert data['rows'] == []
    assert data.get('unavailable') is None


def test_reachable_with_nothing_low_is_not_flagged_as_blind(client, auth_headers):
    """Zabbix answered and every cartridge is fine. That is a real zero."""
    with patch('plugins.printers.api.asset_routes._get_low_supplies_data',
               return_value={'printers': [],
                             'summary': {'total_checked': 3, 'low': 0, 'critical': 0}}):
        data = _call(client, auth_headers)

    assert data['rows'] == []
    assert data.get('unavailable') is None


def test_the_envelope_carries_rows_so_the_card_can_still_render(client, auth_headers):
    """The response became an envelope to carry the reason; rows must survive."""
    printer = {
        'printerid': 1, 'assetnumber': 'PRN-1', 'printername': 'Front office',
        'location': 'Bay 3', 'mapx': None, 'mapy': None, 'levelid': None,
        'supplies': [{'name': 'Black', 'remaining': 2, 'status': 'critical'}],
    }
    with patch('plugins.printers.api.asset_routes._get_low_supplies_data',
               return_value={'printers': [printer],
                             'summary': {'total_checked': 1, 'low': 1, 'critical': 1}}):
        data = _call(client, auth_headers)

    assert data.get('unavailable') is None
    assert len(data['rows']) == 1
    assert data['rows'][0]['printername'] == 'Front office'
    assert data['rows'][0]['iscritical'] is True