"""Reading the kept syslog lines (#6000): the filter read from a page's
arguments, severity by name or number, and which sources a host's or a
device's page shows."""
from types import SimpleNamespace as NS

import pytest
from werkzeug.datastructures import MultiDict

from plugins.syslog.service import DEFAULT_RANGE, line_filter, severity_level, sources_for


def test_a_severity_reads_by_name_alias_or_number():
    assert severity_level("err") == 3 and severity_level("error") == 3 and severity_level("3") == 3
    assert severity_level("Warning") == 4 and severity_level("warn") == 4
    assert severity_level("") is None and severity_level(None) is None
    with pytest.raises(ValueError, match="0-7"):
        severity_level("loud")


def test_a_page_filter_drops_what_does_not_read():
    f = line_filter(MultiDict({"severity": "loud", "range": "9y", "q": "  nfsd  ", "app": "kernel"}))
    assert (f.severity, f.range, f.text, f.app) == (None, DEFAULT_RANGE, "nfsd", "kernel")
    assert f.args() == {"q": "nfsd", "app": "kernel"}
    assert line_filter(MultiDict({"severity": "4", "range": "7d"})).args() == {"severity": "4", "range": "7d"}


def _src(sid, state="accepted", host_id=None, address="10.0.0.5"):
    return NS(id=sid, state=state, host_id=host_id, address=address)


def test_a_page_shows_sources_bound_to_its_host_or_unbound_at_its_address():
    sources = [_src("bound", host_id="h1", address="10.9.9.9"), _src("by-address"),
               _src("elsewhere", host_id="h2"), _src("offered", state="offered"),
               _src("other", address="10.0.0.6")]
    assert [s.id for s in sources_for(sources, "h1", "10.0.0.5")] == ["bound", "by-address"]
    # An SNMP device bound to no host matches by its address alone.
    assert [s.id for s in sources_for(sources, None, "10.0.0.5")] == ["by-address"]
    assert sources_for(sources, None, None) == []