text: """Support for lights through the SmartThings cloud API."""
  import asyncio
  
  from homeassistant.components.light import (
      ATTR_BRIGHTNESS, ATTR_COLOR_TEMP, ATTR_HS_COLOR, ATTR_TRANSITION,
      SUPPORT_BRIGHTNESS, SUPPORT_COLOR, SUPPORT_COLOR_TEMP, SUPPORT_TRANSITION,
      Light)
  import homeassistant.util.color as color_util
  
  from . import SmartThingsEntity
  from .const import DATA_BROKERS, DOMAIN
  
  DEPENDENCIES = ['smartthings']
  
  
  async def async_setup_platform(
          hass, config, async_add_entities, discovery_info=None):
      """Platform uses config entry setup."""
      pass
  
  
  async def async_setup_entry(hass, config_entry, async_add_entities):
      """Add lights for a config entry."""
      broker = hass.data[DOMAIN][DATA_BROKERS][config_entry.entry_id]
      async_add_entities(
          [SmartThingsLight(device) for device in broker.devices.values()
           if is_light(device)], True)
  
  
  def is_light(device):
      """Determine if the device should be represented as a light."""
      from pysmartthings import Capability
  
      # Must be able to be turned on/off.
      if Capability.switch not in device.capabilities:
          return False
      # Not a fan (which might also have switch_level)
      if Capability.fan_speed in device.capabilities:
          return False
      # Must have one of these
      light_capabilities = [
          Capability.color_control,
          Capability.color_temperature,
          Capability.switch_level
      ]
      if any(capability in device.capabilities
             for capability in light_capabilities):
          return True
      return False
  
  
  def convert_scale(value, value_scale, target_scale, round_digits=4):
      """Convert a value to a different scale."""
      return round(value * target_scale / value_scale, round_digits)
  
  
  class SmartThingsLight(SmartThingsEntity, Light):
      """Define a SmartThings Light."""
  
      def __init__(self, device):
          """Initialize a SmartThingsLight."""
          super().__init__(device)
          self._brightness = None
          self._color_temp = None
          self._hs_color = None
          self._supported_features = self._determine_features()
  
      def _determine_features(self):
          """Get features supported by the device."""
          from pysmartthings.device import Capability
  
          features = 0
          # Brightness and transition
          if Capability.switch_level in self._device.capabilities:
              features |= \
                  SUPPORT_BRIGHTNESS | SUPPORT_TRANSITION
          # Color Temperature
          if Capability.color_temperature in self._device.capabilities:
              features |= SUPPORT_COLOR_TEMP
          # Color
          if Capability.color_control in self._device.capabilities:
              features |= SUPPORT_COLOR
  
          return features
  
      async def async_turn_on(self, **kwargs) -> None:
          """Turn the light on."""
          tasks = []
          # Color temperature
          if self._supported_features & SUPPORT_COLOR_TEMP \
             and ATTR_COLOR_TEMP in kwargs:
              tasks.append(self.async_set_color_temp(
                  kwargs[ATTR_COLOR_TEMP]))
          # Color
          if self._supported_features & SUPPORT_COLOR \
             and ATTR_HS_COLOR in kwargs:
              tasks.append(self.async_set_color(
                  kwargs[ATTR_HS_COLOR]))
          if tasks:
              # Set temp/color first
              await asyncio.gather(*tasks)
  
          # Switch/brightness/transition
          if self._supported_features & SUPPORT_BRIGHTNESS \
             and ATTR_BRIGHTNESS in kwargs:
              await self.async_set_level(
                  kwargs[ATTR_BRIGHTNESS],
                  kwargs.get(ATTR_TRANSITION, 0))
          else:
              await self._device.switch_on(set_status=True)
  
          # State is set optimistically in the commands above, therefore update
          # the entity state ahead of receiving the confirming push updates
          self.async_schedule_update_ha_state(True)
  
      async def async_turn_off(self, **kwargs) -> None:
          """Turn the light off."""
          # Switch/transition
          if self._supported_features & SUPPORT_TRANSITION \
                  and ATTR_TRANSITION in kwargs:
              await self.async_set_level(0, int(kwargs[ATTR_TRANSITION]))
          else:
              await self._device.switch_off(set_status=True)
  
          # State is set optimistically in the commands above, therefore update
          # the entity state ahead of receiving the confirming push updates
          self.async_schedule_update_ha_state(True)
  
      async def async_update(self):
          """Update entity attributes when the device status has changed."""
          # Brightness and transition
          if self._supported_features & SUPPORT_BRIGHTNESS:
              self._brightness = convert_scale(
                  self._device.status.level, 100, 255)
          # Color Temperature
          if self._supported_features & SUPPORT_COLOR_TEMP:
              self._color_temp = color_util.color_temperature_kelvin_to_mired(
                  self._device.status.color_temperature)
          # Color
          if self._supported_features & SUPPORT_COLOR:
              self._hs_color = (
                  convert_scale(self._device.status.hue, 100, 360),
                  self._device.status.saturation
              )
  
      async def async_set_color(self, hs_color):
          """Set the color of the device."""
          hue = convert_scale(float(hs_color[0]), 360, 100)
          hue = max(min(hue, 100.0), 0.0)
          saturation = max(min(float(hs_color[1]), 100.0), 0.0)
          await self._device.set_color(
              hue, saturation, set_status=True)
  
      async def async_set_color_temp(self, value: float):
          """Set the color temperature of the device."""
          kelvin = color_util.color_temperature_mired_to_kelvin(value)
          kelvin = max(min(kelvin, 30000.0), 1.0)
          await self._device.set_color_temperature(
              kelvin, set_status=True)
  
      async def async_set_level(self, brightness: int, transition: int):
          """Set the brightness of the light over transition."""
          level = int(convert_scale(brightness, 255, 100, 0))
          # Due to rounding, set level to 1 (one) so we don't inadvertently
          # turn off the light when a low brightness is set.
          level = 1 if level == 0 and brightness > 0 else level
          level = max(min(level, 100), 0)
          duration = int(transition)
          await self._device.set_level(level, duration, set_status=True)
  
      @property
      def brightness(self):
          """Return the brightness of this light between 0..255."""
          return self._brightness
  
      @property
      def color_temp(self):
          """Return the CT color value in mireds."""
          return self._color_temp
  
      @property
      def hs_color(self):
          """Return the hue and saturation color value [float, float]."""
          return self._hs_color
  
      @property
      def is_on(self) -> bool:
          """Return true if light is on."""
          return self._device.status.switch
  
      @property
      def max_mireds(self):
          """Return the warmest color_temp that this light supports."""
          # SmartThings does not expose this attribute, instead it's
          # implemented within each device-type handler.  This value is the
          # lowest kelvin found supported across 20+ handlers.
          return 500  # 2000K
  
      @property
      def min_mireds(self):
          """Return the coldest color_temp that this light supports."""
          # SmartThings does not expose this attribute, instead it's
          # implemented within each device-type handler.  This value is the
          # highest kelvin found supported across 20+ handlers.
          return 111  # 9000K
  
      @property
      def supported_features(self) -> int:
          """Flag supported features."""
          return self._supported_features
  