Hue: Convert XY to HS color if HS not present (#13465)

* Hue: Convert XY to HS color if HS not present

* Revert change to test

* Address comments

* Lint

homeassistant/components/light/hue.py

@@ -18,6 +18,7 @@ from homeassistant.components.light import (
     FLASH_LONG, FLASH_SHORT, SUPPORT_BRIGHTNESS, SUPPORT_COLOR_TEMP,
     SUPPORT_EFFECT, SUPPORT_FLASH, SUPPORT_COLOR, SUPPORT_TRANSITION,
     Light)
+from homeassistant.util import color
 
 DEPENDENCIES = ['hue']
 SCAN_INTERVAL = timedelta(seconds=5)
@@ -235,19 +236,26 @@ class HueLight(Light):
     @property
     def hs_color(self):
         """Return the hs color value."""
-        # Don't return hue/sat if in color temperature mode
-        if self._color_mode == "ct":
+        # pylint: disable=redefined-outer-name
+        mode = self._color_mode
+
+        if mode not in ('hs', 'xy'):
+            return
+
+        source = self.light.action if self.is_group else self.light.state
+
+        hue = source.get('hue')
+        sat = source.get('sat')
+
+        # Sometimes the state will not include valid hue/sat values.
+        # Reported as issue 13434
+        if hue is not None and sat is not None:
+            return hue / 65535 * 360, sat / 255 * 100
+
+        if 'xy' not in source:
             return None
 
-        if self.is_group:
-            return (
-                self.light.action.get('hue') / 65535 * 360,
-                self.light.action.get('sat') / 255 * 100,
-            )
-        return (
-            self.light.state.get('hue') / 65535 * 360,
-            self.light.state.get('sat') / 255 * 100,
-        )
+        return color.color_xy_to_hs(*source['xy'])
 
     @property
     def color_temp(self):

tests/components/light/test_hue.py

@@ -11,6 +11,7 @@ import pytest
 
 from homeassistant.components import hue
 import homeassistant.components.light.hue as hue_light
+from homeassistant.util import color
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -623,3 +624,59 @@ def test_available():
     )
 
     assert light.available is True
+
+
+def test_hs_color():
+    """Test hs_color property."""
+    light = hue_light.HueLight(
+        light=Mock(state={
+            'colormode': 'ct',
+            'hue': 1234,
+            'sat': 123,
+        }),
+        request_bridge_update=None,
+        bridge=Mock(),
+        is_group=False,
+    )
+
+    assert light.hs_color is None
+
+    light = hue_light.HueLight(
+        light=Mock(state={
+            'colormode': 'hs',
+            'hue': 1234,
+            'sat': 123,
+        }),
+        request_bridge_update=None,
+        bridge=Mock(),
+        is_group=False,
+    )
+
+    assert light.hs_color == (1234 / 65535 * 360, 123 / 255 * 100)
+
+    light = hue_light.HueLight(
+        light=Mock(state={
+            'colormode': 'xy',
+            'hue': 1234,
+            'sat': 123,
+        }),
+        request_bridge_update=None,
+        bridge=Mock(),
+        is_group=False,
+    )
+
+    assert light.hs_color == (1234 / 65535 * 360, 123 / 255 * 100)
+
+    light = hue_light.HueLight(
+        light=Mock(state={
+            'colormode': 'xy',
+            'hue': None,
+            'sat': 123,
+            'xy': [0.4, 0.5]
+        }),
+        request_bridge_update=None,
+        bridge=Mock(),
+        is_group=False,
+    )
+
+    assert light.hs_color == color.color_xy_to_hs(0.4, 0.5)