Mark UniFi power cycle button as unavailable if PoE is not enabled on…

… port (#122035)

homeassistant/components/unifi/button.py

@@ -8,7 +8,7 @@
 from collections.abc import Callable, Coroutine
 from dataclasses import dataclass
 import secrets
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 import aiounifi
 from aiounifi.interfaces.api_handlers import ItemEvent
@@ -44,6 +44,17 @@
     async_wlan_device_info_fn,
 )
 
+if TYPE_CHECKING:
+    from .hub import UnifiHub
+
+
+@callback
+def async_port_power_cycle_available_fn(hub: UnifiHub, obj_id: str) -> bool:
+    """Check if port allows power cycle action."""
+    if not async_device_available_fn(hub, obj_id):
+        return False
+    return bool(hub.api.ports[obj_id].poe_enable)
+
 
 async def async_restart_device_control_fn(
     api: aiounifi.Controller, obj_id: str
@@ -96,7 +107,7 @@ class UnifiButtonEntityDescription(
         entity_category=EntityCategory.CONFIG,
         device_class=ButtonDeviceClass.RESTART,
         api_handler_fn=lambda api: api.ports,
-        available_fn=async_device_available_fn,
+        available_fn=async_port_power_cycle_available_fn,
         control_fn=async_power_cycle_port_control_fn,
         device_info_fn=async_device_device_info_fn,
         name_fn=lambda port: f"{port.name} Power Cycle",

tests/components/unifi/test_button.py

@@ -1,9 +1,11 @@
 """UniFi Network button platform tests."""
 
+from copy import deepcopy
 from datetime import timedelta
 from typing import Any
 from unittest.mock import patch
 
+from aiounifi.models.message import MessageKey
 import pytest
 
 from homeassistant.components.button import DOMAIN as BUTTON_DOMAIN, ButtonDeviceClass
@@ -319,3 +321,33 @@ async def test_wlan_button_entities(
         request_data,
         call,
     )
+
+
+@pytest.mark.parametrize("device_payload", [DEVICE_POWER_CYCLE_POE])
+@pytest.mark.usefixtures("config_entry_setup")
+async def test_power_cycle_availability(
+    hass: HomeAssistant,
+    mock_websocket_message,
+    device_payload: dict[str, Any],
+) -> None:
+    """Verify that disabling PoE marks entity as unavailable."""
+    entity_id = "button.switch_port_1_power_cycle"
+
+    assert hass.states.get(entity_id).state != STATE_UNAVAILABLE
+
+    # PoE disabled
+
+    device_1 = deepcopy(device_payload[0])
+    device_1["port_table"][0]["poe_enable"] = False
+    mock_websocket_message(message=MessageKey.DEVICE, data=device_1)
+    await hass.async_block_till_done()
+
+    assert hass.states.get(entity_id).state == STATE_UNAVAILABLE
+
+    # PoE enabled
+    device_1 = deepcopy(device_payload[0])
+    device_1["port_table"][0]["poe_enable"] = True
+    mock_websocket_message(message=MessageKey.DEVICE, data=device_1)
+    await hass.async_block_till_done()
+
+    assert hass.states.get(entity_id).state != STATE_UNAVAILABLE