text: """Configure select in a device through MQTT topic."""
  from __future__ import annotations
  
  import functools
  import logging
  
  import voluptuous as vol
  
  from homeassistant.components import select
  from homeassistant.components.select import SelectEntity
  from homeassistant.config_entries import ConfigEntry
  from homeassistant.const import CONF_NAME, CONF_OPTIMISTIC, CONF_VALUE_TEMPLATE
  from homeassistant.core import HomeAssistant, callback
  from homeassistant.helpers import config_validation as cv
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.reload import async_setup_reload_service
  from homeassistant.helpers.restore_state import RestoreEntity
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  from . import PLATFORMS, MqttCommandTemplate, MqttValueTemplate, subscription
  from .. import mqtt
  from .const import (
      CONF_COMMAND_TOPIC,
      CONF_ENCODING,
      CONF_QOS,
      CONF_RETAIN,
      CONF_STATE_TOPIC,
      DOMAIN,
  )
  from .debug_info import log_messages
  from .mixins import MQTT_ENTITY_COMMON_SCHEMA, MqttEntity, async_setup_entry_helper
  
  CONF_COMMAND_TEMPLATE = "command_template"
  
  _LOGGER = logging.getLogger(__name__)
  
  CONF_OPTIONS = "options"
  
  DEFAULT_NAME = "MQTT Select"
  DEFAULT_OPTIMISTIC = False
  
  MQTT_SELECT_ATTRIBUTES_BLOCKED = frozenset(
      {
          select.ATTR_OPTIONS,
      }
  )
  
  
  _PLATFORM_SCHEMA_BASE = mqtt.MQTT_RW_PLATFORM_SCHEMA.extend(
      {
          vol.Optional(CONF_COMMAND_TEMPLATE): cv.template,
          vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
          vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
          vol.Required(CONF_OPTIONS): cv.ensure_list,
          vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
      },
  ).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)
  
  PLATFORM_SCHEMA = vol.All(_PLATFORM_SCHEMA_BASE)
  
  DISCOVERY_SCHEMA = vol.All(_PLATFORM_SCHEMA_BASE.extend({}, extra=vol.REMOVE_EXTRA))
  
  
  async def async_setup_platform(
      hass: HomeAssistant,
      config: ConfigType,
      async_add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Set up MQTT select through configuration.yaml."""
      await async_setup_reload_service(hass, DOMAIN, PLATFORMS)
      await _async_setup_entity(hass, async_add_entities, config)
  
  
  async def async_setup_entry(
      hass: HomeAssistant,
      config_entry: ConfigEntry,
      async_add_entities: AddEntitiesCallback,
  ) -> None:
      """Set up MQTT select dynamically through MQTT discovery."""
      setup = functools.partial(
          _async_setup_entity, hass, async_add_entities, config_entry=config_entry
      )
      await async_setup_entry_helper(hass, select.DOMAIN, setup, DISCOVERY_SCHEMA)
  
  
  async def _async_setup_entity(
      hass, async_add_entities, config, config_entry=None, discovery_data=None
  ):
      """Set up the MQTT select."""
      async_add_entities([MqttSelect(hass, config, config_entry, discovery_data)])
  
  
  class MqttSelect(MqttEntity, SelectEntity, RestoreEntity):
      """representation of an MQTT select."""
  
      _entity_id_format = select.ENTITY_ID_FORMAT
  
      _attributes_extra_blocked = MQTT_SELECT_ATTRIBUTES_BLOCKED
  
      def __init__(self, hass, config, config_entry, discovery_data):
          """Initialize the MQTT select."""
          self._config = config
          self._optimistic = False
          self._sub_state = None
  
          self._attr_current_option = None
  
          SelectEntity.__init__(self)
          MqttEntity.__init__(self, hass, config, config_entry, discovery_data)
  
      @staticmethod
      def config_schema():
          """Return the config schema."""
          return DISCOVERY_SCHEMA
  
      def _setup_from_config(self, config):
          """(Re)Setup the entity."""
          self._optimistic = config[CONF_OPTIMISTIC]
          self._attr_options = config[CONF_OPTIONS]
  
          self._templates = {
              CONF_COMMAND_TEMPLATE: MqttCommandTemplate(
                  config.get(CONF_COMMAND_TEMPLATE), entity=self
              ).async_render,
              CONF_VALUE_TEMPLATE: MqttValueTemplate(
                  config.get(CONF_VALUE_TEMPLATE),
                  entity=self,
              ).async_render_with_possible_json_value,
          }
  
      async def _subscribe_topics(self):
          """(Re)Subscribe to topics."""
  
          @callback
          @log_messages(self.hass, self.entity_id)
          def message_received(msg):
              """Handle new MQTT messages."""
              payload = self._templates[CONF_VALUE_TEMPLATE](msg.payload)
  
              if payload.lower() == "none":
                  payload = None
  
              if payload is not None and payload not in self.options:
                  _LOGGER.error(
                      "Invalid option for %s: '%s' (valid options: %s)",
                      self.entity_id,
                      payload,
                      self.options,
                  )
                  return
  
              self._attr_current_option = payload
              self.async_write_ha_state()
  
          if self._config.get(CONF_STATE_TOPIC) is None:
              # Force into optimistic mode.
              self._optimistic = True
          else:
              self._sub_state = await subscription.async_subscribe_topics(
                  self.hass,
                  self._sub_state,
                  {
                      "state_topic": {
                          "topic": self._config.get(CONF_STATE_TOPIC),
                          "msg_callback": message_received,
                          "qos": self._config[CONF_QOS],
                          "encoding": self._config[CONF_ENCODING] or None,
                      }
                  },
              )
  
          if self._optimistic and (last_state := await self.async_get_last_state()):
              self._attr_current_option = last_state.state
  
      async def async_select_option(self, option: str) -> None:
          """Update the current value."""
          payload = self._templates[CONF_COMMAND_TEMPLATE](option)
          if self._optimistic:
              self._attr_current_option = option
              self.async_write_ha_state()
  
          await mqtt.async_publish(
              self.hass,
              self._config[CONF_COMMAND_TOPIC],
              payload,
              self._config[CONF_QOS],
              self._config[CONF_RETAIN],
              self._config[CONF_ENCODING],
          )
  
      @property
      def assumed_state(self):
          """Return true if we do optimistic updates."""
          return self._optimistic
  