Make Light and Fan a common module interface (#911)

kasa/smart/modules/brightness.py

@@ -2,16 +2,10 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
-
 from ...feature import Feature
 from ..smartmodule import SmartModule
 
-if TYPE_CHECKING:
-    from ..smartdevice import SmartDevice
-
-
-BRIGHTNESS_MIN = 1
+BRIGHTNESS_MIN = 0
 BRIGHTNESS_MAX = 100
 
 
@@ -20,8 +14,11 @@ class Brightness(SmartModule):
 
     REQUIRED_COMPONENT = "brightness"
 
-    def __init__(self, device: SmartDevice, module: str):
-        super().__init__(device, module)
+    def _initialize_features(self):
+        """Initialize features."""
+        super()._initialize_features()
+
+        device = self._device
         self._add_feature(
             Feature(
                 device,
@@ -47,8 +44,11 @@ class Brightness(SmartModule):
         """Return current brightness."""
         return self.data["brightness"]
 
-    async def set_brightness(self, brightness: int):
-        """Set the brightness."""
+    async def set_brightness(self, brightness: int, *, transition: int | None = None):
+        """Set the brightness. A brightness value of 0 will turn off the light.
+
+        Note, transition is not supported and will be ignored.
+        """
         if not isinstance(brightness, int) or not (
             BRIGHTNESS_MIN <= brightness <= BRIGHTNESS_MAX
         ):
@@ -57,6 +57,8 @@ class Brightness(SmartModule):
                 f"(valid range: {BRIGHTNESS_MIN}-{BRIGHTNESS_MAX}%)"
             )
 
+        if brightness == 0:
+            return await self._device.turn_off()
         return await self.call("set_device_info", {"brightness": brightness})
 
     async def _check_supported(self):