Axis use entity description light platform (#113602)

* Axis use entity description in light platform

* Clean up some old code

* Update homeassistant/components/axis/light.py

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

---------

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/components/axis/light.py

@@ -1,75 +1,114 @@
 """Support for Axis lights."""
 
+from collections.abc import Callable, Iterable
+from dataclasses import dataclass
+from functools import partial
 from typing import Any
 
 from axis.models.event import Event, EventOperation, EventTopic
 
-from homeassistant.components.light import ATTR_BRIGHTNESS, ColorMode, LightEntity
+from homeassistant.components.light import (
+    ATTR_BRIGHTNESS,
+    ColorMode,
+    LightEntity,
+    LightEntityDescription,
+)
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
-from .entity import AxisEventEntity
+from .entity import TOPIC_TO_EVENT_TYPE, AxisEventEntity
 from .hub import AxisHub
 
 
+@callback
+def light_name_fn(hub: AxisHub, event: Event) -> str:
+    """Provide Axis light entity name."""
+    event_type = TOPIC_TO_EVENT_TYPE[event.topic_base]
+    light_id = f"led{event.id}"
+    light_type = hub.api.vapix.light_control[light_id].light_type
+    return f"{light_type} {event_type} {event.id}"
+
+
+@dataclass(frozen=True, kw_only=True)
+class AxisLightDescription(LightEntityDescription):
+    """Axis light entity description."""
+
+    event_topic: EventTopic
+    """Event topic that provides state updates."""
+    name_fn: Callable[[AxisHub, Event], str]
+    """Function providing the corresponding name to the event ID."""
+    supported_fn: Callable[[AxisHub, Event], bool]
+    """Function validating if event is supported."""
+
+
+ENTITY_DESCRIPTIONS = (
+    AxisLightDescription(
+        key="Light state control",
+        event_topic=EventTopic.LIGHT_STATUS,
+        name_fn=light_name_fn,
+        supported_fn=lambda hub, event: len(hub.api.vapix.light_control) > 0,
+    ),
+)
+
+
 async def async_setup_entry(
     hass: HomeAssistant,
     config_entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
 ) -> None:
-    """Set up a Axis light."""
+    """Set up the Axis light platform."""
     hub = AxisHub.get_hub(hass, config_entry)
 
-    if hub.api.vapix.light_control is None or len(hub.api.vapix.light_control) == 0:
-        return
-
     @callback
-    def async_create_entity(event: Event) -> None:
-        """Create Axis light entity."""
-        async_add_entities([AxisLight(event, hub)])
+    def register_platform(descriptions: Iterable[AxisLightDescription]) -> None:
+        """Register entity platform to create entities on event initialized signal."""
 
-    hub.api.event.subscribe(
-        async_create_entity,
-        topic_filter=EventTopic.LIGHT_STATUS,
-        operation_filter=EventOperation.INITIALIZED,
-    )
+        @callback
+        def create_entity(description: AxisLightDescription, event: Event) -> None:
+            """Create Axis entity."""
+            if description.supported_fn(hub, event):
+                async_add_entities([AxisLight(hub, description, event)])
+
+        for description in descriptions:
+            hub.api.event.subscribe(
+                partial(create_entity, description),
+                topic_filter=description.event_topic,
+                operation_filter=EventOperation.INITIALIZED,
+            )
+
+    register_platform(ENTITY_DESCRIPTIONS)
 
 
 class AxisLight(AxisEventEntity, LightEntity):
-    """Representation of a light Axis event."""
+    """Representation of an Axis light."""
 
     _attr_should_poll = True
+    _attr_color_mode = ColorMode.BRIGHTNESS
+    _attr_supported_color_modes = {ColorMode.BRIGHTNESS}
 
-    def __init__(self, event: Event, hub: AxisHub) -> None:
+    def __init__(
+        self, hub: AxisHub, description: AxisLightDescription, event: Event
+    ) -> None:
         """Initialize the Axis light."""
         super().__init__(event, hub)
-
-        self._light_id = f"led{event.id}"
-
-        self.current_intensity = 0
-        self.max_intensity = 0
-
-        light_type = hub.api.vapix.light_control[self._light_id].light_type
-        self._attr_name = f"{light_type} {self._event_type} {event.id}"
+        self.entity_description = description
+        self._attr_name = description.name_fn(hub, event)
         self._attr_is_on = event.is_tripped
 
-        self._attr_supported_color_modes = {ColorMode.BRIGHTNESS}
-        self._attr_color_mode = ColorMode.BRIGHTNESS
+        self._light_id = f"led{event.id}"
+        self.current_intensity = 0
+        self.max_intensity = 0
 
     async def async_added_to_hass(self) -> None:
         """Subscribe lights events."""
         await super().async_added_to_hass()
-
-        current_intensity = (
+        self.current_intensity = (
             await self.hub.api.vapix.light_control.get_current_intensity(self._light_id)
         )
-        self.current_intensity = current_intensity
-
-        max_intensity = await self.hub.api.vapix.light_control.get_valid_intensity(
-            self._light_id
-        )
-        self.max_intensity = max_intensity.high
+        self.max_intensity = (
+            await self.hub.api.vapix.light_control.get_valid_intensity(self._light_id)
+        ).high
 
     @callback
     def async_event_callback(self, event: Event) -> None:
@@ -100,7 +139,6 @@ class AxisLight(AxisEventEntity, LightEntity):
 
     async def async_update(self) -> None:
         """Update brightness."""
-        current_intensity = (
+        self.current_intensity = (
             await self.hub.api.vapix.light_control.get_current_intensity(self._light_id)
         )
-        self.current_intensity = current_intensity