text: """
  Support for local control of entities by emulating the Phillips Hue bridge.
  
  For more details about this component, please refer to the documentation at
  https://home-assistant.io/components/emulated_hue/
  """
  import asyncio
  import logging
  
  import voluptuous as vol
  
  from homeassistant import util
  from homeassistant.const import (
      EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP,
  )
  from homeassistant.components.http import HomeAssistantWSGI
  import homeassistant.helpers.config_validation as cv
  from .hue_api import (
      HueUsernameView, HueAllLightsStateView, HueOneLightStateView,
      HueOneLightChangeView)
  from .upnp import DescriptionXmlView, UPNPResponderThread
  
  DOMAIN = 'emulated_hue'
  
  _LOGGER = logging.getLogger(__name__)
  
  CONF_HOST_IP = 'host_ip'
  CONF_LISTEN_PORT = 'listen_port'
  CONF_OFF_MAPS_TO_ON_DOMAINS = 'off_maps_to_on_domains'
  CONF_EXPOSE_BY_DEFAULT = 'expose_by_default'
  CONF_EXPOSED_DOMAINS = 'exposed_domains'
  CONF_TYPE = 'type'
  
  TYPE_ALEXA = 'alexa'
  TYPE_GOOGLE = 'google_home'
  
  DEFAULT_LISTEN_PORT = 8300
  DEFAULT_OFF_MAPS_TO_ON_DOMAINS = ['script', 'scene']
  DEFAULT_EXPOSE_BY_DEFAULT = True
  DEFAULT_EXPOSED_DOMAINS = [
      'switch', 'light', 'group', 'input_boolean', 'media_player', 'fan'
  ]
  DEFAULT_TYPE = TYPE_ALEXA
  
  CONFIG_SCHEMA = vol.Schema({
      DOMAIN: vol.Schema({
          vol.Optional(CONF_HOST_IP): cv.string,
          vol.Optional(CONF_LISTEN_PORT, default=DEFAULT_LISTEN_PORT):
              vol.All(vol.Coerce(int), vol.Range(min=1, max=65535)),
          vol.Optional(CONF_OFF_MAPS_TO_ON_DOMAINS): cv.ensure_list,
          vol.Optional(CONF_EXPOSE_BY_DEFAULT): cv.boolean,
          vol.Optional(CONF_EXPOSED_DOMAINS): cv.ensure_list,
          vol.Optional(CONF_TYPE, default=DEFAULT_TYPE):
              vol.Any(TYPE_ALEXA, TYPE_GOOGLE)
      })
  }, extra=vol.ALLOW_EXTRA)
  
  ATTR_EMULATED_HUE = 'emulated_hue'
  
  
  def setup(hass, yaml_config):
      """Activate the emulated_hue component."""
      config = Config(yaml_config.get(DOMAIN, {}))
  
      server = HomeAssistantWSGI(
          hass,
          development=False,
          server_host=config.host_ip_addr,
          server_port=config.listen_port,
          api_password=None,
          ssl_certificate=None,
          ssl_key=None,
          cors_origins=None,
          use_x_forwarded_for=False,
          trusted_networks=[],
          login_threshold=0,
          is_ban_enabled=False
      )
  
      server.register_view(DescriptionXmlView(config))
      server.register_view(HueUsernameView)
      server.register_view(HueAllLightsStateView(config))
      server.register_view(HueOneLightStateView(config))
      server.register_view(HueOneLightChangeView(config))
  
      upnp_listener = UPNPResponderThread(
          config.host_ip_addr, config.listen_port)
  
      @asyncio.coroutine
      def stop_emulated_hue_bridge(event):
          """Stop the emulated hue bridge."""
          upnp_listener.stop()
          yield from server.stop()
  
      @asyncio.coroutine
      def start_emulated_hue_bridge(event):
          """Start the emulated hue bridge."""
          upnp_listener.start()
          yield from server.start()
          hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP,
                                     stop_emulated_hue_bridge)
  
      hass.bus.listen_once(EVENT_HOMEASSISTANT_START, start_emulated_hue_bridge)
  
      return True
  
  
  class Config(object):
      """Holds configuration variables for the emulated hue bridge."""
  
      def __init__(self, conf):
          """Initialize the instance."""
          self.type = conf.get(CONF_TYPE)
          self.numbers = {}
          self.cached_states = {}
  
          # Get the IP address that will be passed to the Echo during discovery
          self.host_ip_addr = conf.get(CONF_HOST_IP)
          if self.host_ip_addr is None:
              self.host_ip_addr = util.get_local_ip()
              _LOGGER.warning(
                  "Listen IP address not specified, auto-detected address is %s",
                  self.host_ip_addr)
  
          # Get the port that the Hue bridge will listen on
          self.listen_port = conf.get(CONF_LISTEN_PORT)
          if not isinstance(self.listen_port, int):
              self.listen_port = DEFAULT_LISTEN_PORT
              _LOGGER.warning(
                  "Listen port not specified, defaulting to %s",
                  self.listen_port)
  
          if self.type == TYPE_GOOGLE and self.listen_port != 80:
              _LOGGER.warning('When targetting Google Home, listening port has '
                              'to be port 80')
  
          # Get domains that cause both "on" and "off" commands to map to "on"
          # This is primarily useful for things like scenes or scripts, which
          # don't really have a concept of being off
          self.off_maps_to_on_domains = conf.get(CONF_OFF_MAPS_TO_ON_DOMAINS)
          if not isinstance(self.off_maps_to_on_domains, list):
              self.off_maps_to_on_domains = DEFAULT_OFF_MAPS_TO_ON_DOMAINS
  
          # Get whether or not entities should be exposed by default, or if only
          # explicitly marked ones will be exposed
          self.expose_by_default = conf.get(
              CONF_EXPOSE_BY_DEFAULT, DEFAULT_EXPOSE_BY_DEFAULT)
  
          # Get domains that are exposed by default when expose_by_default is
          # True
          self.exposed_domains = conf.get(
              CONF_EXPOSED_DOMAINS, DEFAULT_EXPOSED_DOMAINS)
  
      def entity_id_to_number(self, entity_id):
          """Get a unique number for the entity id."""
          if self.type == TYPE_ALEXA:
              return entity_id
  
          # Google Home
          for number, ent_id in self.numbers.items():
              if entity_id == ent_id:
                  return number
  
          number = str(len(self.numbers) + 1)
          self.numbers[number] = entity_id
          return number
  
      def number_to_entity_id(self, number):
          """Convert unique number to entity id."""
          if self.type == TYPE_ALEXA:
              return number
  
          # Google Home
          assert isinstance(number, str)
          return self.numbers.get(number)
  
      def is_entity_exposed(self, entity):
          """Determine if an entity should be exposed on the emulated bridge.
  
          Async friendly.
          """
          if entity.attributes.get('view') is not None:
              # Ignore entities that are views
              return False
  
          domain = entity.domain.lower()
          explicit_expose = entity.attributes.get(ATTR_EMULATED_HUE, None)
  
          domain_exposed_by_default = \
              self.expose_by_default and domain in self.exposed_domains
  
          # Expose an entity if the entity's domain is exposed by default and
          # the configuration doesn't explicitly exclude it from being
          # exposed, or if the entity is explicitly exposed
          is_default_exposed = \
              domain_exposed_by_default and explicit_expose is not False
  
          return is_default_exposed or explicit_expose
  