"""Unit tests for mapping config-defined SNMP devices onto a Steward host."""
from plugins.snmp.routes import _devices_for_host

_CFG = [
    {"name": "core-switch", "host": "192.168.1.1"},
    {"name": "ups", "host": "192.168.1.10"},
    {"name": "by-name", "host": "edge-router"},
    "not-a-dict",                     # tolerated, skipped
    {"name": "no-host"},              # no host → never matches
]


def test_matches_by_address():
    out = _devices_for_host(_CFG, "192.168.1.1", "somehost")
    assert [d["name"] for d in out] == ["core-switch"]


def test_matches_by_name_case_insensitive():
    out = _devices_for_host(_CFG, "10.0.0.9", "Edge-Router")
    assert [d["name"] for d in out] == ["by-name"]


def test_no_match_returns_empty():
    assert _devices_for_host(_CFG, "10.0.0.1", "nope") == []


def test_blank_address_and_name_match_nothing():
    # A host with no address/name must not match a device with a blank host.
    assert _devices_for_host(_CFG, "", None) == []


def test_implicit_match_unaffected_when_host_id_passed():
    # Passing the new host_id arg must not break the legacy implicit match.
    out = _devices_for_host(_CFG, "192.168.1.1", "somehost", host_id="h-1")
    assert [d["name"] for d in out] == ["core-switch"]


# ── Explicit binding ─────────────────────────────────────────────────────────

def test_explicit_host_id_matches_exact_uuid():
    cfg = [{"name": "sw", "host": "10.0.0.5", "host_id": "uuid-abc"}]
    out = _devices_for_host(cfg, "10.0.0.9", "other", host_id="uuid-abc")
    assert [d["name"] for d in out] == ["sw"]


def test_explicit_steward_host_matches_by_name_or_address():
    cfg = [{"name": "pdu", "host": "10.0.0.5", "steward_host": "Switch01"}]
    # Bind hits the Host's name despite a different poll target / address.
    by_name = _devices_for_host(cfg, "10.0.0.9", "switch01", host_id="h9")
    by_addr = _devices_for_host(cfg, "switch01", "whatever", host_id="h9")
    assert [d["name"] for d in by_name] == ["pdu"]
    assert [d["name"] for d in by_addr] == ["pdu"]


def test_explicit_binding_is_exclusive():
    # Device polls 192.168.1.1 but is explicitly bound to host A by name.
    cfg = [{"name": "sw", "host": "192.168.1.1", "steward_host": "hostA"}]
    # Host B *would* match implicitly by the poll target — but must NOT,
    # because the explicit binding takes over and points only at host A.
    hostB = _devices_for_host(cfg, "192.168.1.1", "hostB", host_id="b")
    hostA = _devices_for_host(cfg, "10.0.0.2", "hostA", host_id="a")
    assert hostB == []
    assert [d["name"] for d in hostA] == ["sw"]


def test_explicit_host_id_wrong_uuid_does_not_match():
    cfg = [{"name": "sw", "host": "10.0.0.5", "host_id": "uuid-abc"}]
    out = _devices_for_host(cfg, "10.0.0.5", "sw", host_id="uuid-zzz")
    assert out == []