entity_registry.py

"""Provide a registry to track entity IDs.

The Entity Registry keeps a registry of entities. Entities are uniquely
identified by their domain, platform and a unique id provided by that platform.

The Entity Registry will persist itself 10 seconds after a new entity is
registered. Registering a new entity while a timer is in progress resets the
timer.
"""
from __future__ import annotations

from collections import UserDict
from collections.abc import Callable, Iterable, Mapping
import logging
from typing import TYPE_CHECKING, Any, cast

import attr
import voluptuous as vol

from homeassistant.backports.enum import StrEnum
from homeassistant.const import (
    ATTR_DEVICE_CLASS,
    ATTR_FRIENDLY_NAME,
    ATTR_ICON,
    ATTR_RESTORED,
    ATTR_SUPPORTED_FEATURES,
    ATTR_UNIT_OF_MEASUREMENT,
    EVENT_HOMEASSISTANT_START,
    MAX_LENGTH_STATE_DOMAIN,
    MAX_LENGTH_STATE_ENTITY_ID,
    STATE_UNAVAILABLE,
    STATE_UNKNOWN,
)
from homeassistant.core import (
    Event,
    HomeAssistant,
    callback,
    split_entity_id,
    valid_entity_id,
)
from homeassistant.exceptions import MaxLengthExceeded
from homeassistant.loader import bind_hass
from homeassistant.util import slugify, uuid as uuid_util
from homeassistant.util.yaml import load_yaml

from . import device_registry as dr, storage
from .device_registry import EVENT_DEVICE_REGISTRY_UPDATED
from .typing import UNDEFINED, UndefinedType

if TYPE_CHECKING:
    from homeassistant.config_entries import ConfigEntry

    from .entity import EntityCategory

PATH_REGISTRY = "entity_registry.yaml"
DATA_REGISTRY = "entity_registry"
EVENT_ENTITY_REGISTRY_UPDATED = "entity_registry_updated"
SAVE_DELAY = 10
_LOGGER = logging.getLogger(__name__)

STORAGE_VERSION_MAJOR = 1
STORAGE_VERSION_MINOR = 6
STORAGE_KEY = "core.entity_registry"

# Attributes relevant to describing entity
# to external services.
ENTITY_DESCRIBING_ATTRIBUTES = {
    "capabilities",
    "device_class",
    "entity_id",
    "name",
    "original_name",
    "supported_features",
    "unit_of_measurement",
}


class RegistryEntryDisabler(StrEnum):
    """What disabled a registry entry."""

    CONFIG_ENTRY = "config_entry"
    DEVICE = "device"
    HASS = "hass"
    INTEGRATION = "integration"
    USER = "user"


class RegistryEntryHider(StrEnum):
    """What hid a registry entry."""

    INTEGRATION = "integration"
    USER = "user"


@attr.s(slots=True, frozen=True)
class RegistryEntry:
    """Entity Registry Entry."""

    entity_id: str = attr.ib()
    unique_id: str = attr.ib()
    platform: str = attr.ib()
    area_id: str | None = attr.ib(default=None)
    capabilities: Mapping[str, Any] | None = attr.ib(default=None)
    config_entry_id: str | None = attr.ib(default=None)
    device_class: str | None = attr.ib(default=None)
    device_id: str | None = attr.ib(default=None)
    domain: str = attr.ib(init=False, repr=False)
    disabled_by: RegistryEntryDisabler | None = attr.ib(default=None)
    entity_category: EntityCategory | None = attr.ib(default=None)
    hidden_by: RegistryEntryHider | None = attr.ib(default=None)
    icon: str | None = attr.ib(default=None)
    id: str = attr.ib(factory=uuid_util.random_uuid_hex)
    name: str | None = attr.ib(default=None)
    options: Mapping[str, Mapping[str, Any]] = attr.ib(
        default=None, converter=attr.converters.default_if_none(factory=dict)  # type: ignore[misc]
    )
    # As set by integration
    original_device_class: str | None = attr.ib(default=None)
    original_icon: str | None = attr.ib(default=None)
    original_name: str | None = attr.ib(default=None)
    supported_features: int = attr.ib(default=0)
    unit_of_measurement: str | None = attr.ib(default=None)

    @domain.default
    def _domain_default(self) -> str:
        """Compute domain value."""
        return split_entity_id(self.entity_id)[0]

    @property
    def disabled(self) -> bool:
        """Return if entry is disabled."""
        return self.disabled_by is not None

    @property
    def hidden(self) -> bool:
        """Return if entry is hidden."""
        return self.hidden_by is not None

    @callback
    def write_unavailable_state(self, hass: HomeAssistant) -> None:
        """Write the unavailable state to the state machine."""
        attrs: dict[str, Any] = {ATTR_RESTORED: True}

        if self.capabilities is not None:
            attrs.update(self.capabilities)

        device_class = self.device_class or self.original_device_class
        if device_class is not None:
            attrs[ATTR_DEVICE_CLASS] = device_class

        icon = self.icon or self.original_icon
        if icon is not None:
            attrs[ATTR_ICON] = icon

        name = self.name or self.original_name
        if name is not None:
            attrs[ATTR_FRIENDLY_NAME] = name

        if self.supported_features is not None:
            attrs[ATTR_SUPPORTED_FEATURES] = self.supported_features

        if self.unit_of_measurement is not None:
            attrs[ATTR_UNIT_OF_MEASUREMENT] = self.unit_of_measurement

        hass.states.async_set(self.entity_id, STATE_UNAVAILABLE, attrs)


class EntityRegistryStore(storage.Store):
    """Store entity registry data."""

    async def _async_migrate_func(
        self, old_major_version: int, old_minor_version: int, old_data: dict
    ) -> dict:
        """Migrate to the new version."""
        return await _async_migrate(old_major_version, old_minor_version, old_data)


class EntityRegistryItems(UserDict[str, "RegistryEntry"]):
    """Container for entity registry items, maps entity_id -> entry.

    Maintains two additional indexes:
    - id -> entry
    - (domain, platform, unique_id) -> entry
    """

    def __init__(self) -> None:
        """Initialize the container."""
        super().__init__()
        self._entry_ids: dict[str, RegistryEntry] = {}
        self._index: dict[tuple[str, str, str], str] = {}

    def __setitem__(self, key: str, entry: RegistryEntry) -> None:
        """Add an item."""
        if key in self:
            old_entry = self[key]
            del self._entry_ids[old_entry.id]
            del self._index[(old_entry.domain, old_entry.platform, old_entry.unique_id)]
        super().__setitem__(key, entry)
        self._entry_ids.__setitem__(entry.id, entry)
        self._index[(entry.domain, entry.platform, entry.unique_id)] = entry.entity_id

    def __delitem__(self, key: str) -> None:
        """Remove an item."""
        entry = self[key]
        self._entry_ids.__delitem__(entry.id)
        self._index.__delitem__((entry.domain, entry.platform, entry.unique_id))
        super().__delitem__(key)

    def get_entity_id(self, key: tuple[str, str, str]) -> str | None:
        """Get entity_id from (domain, platform, unique_id)."""
        return self._index.get(key)

    def get_entry(self, key: str) -> RegistryEntry | None:
        """Get entry from id."""
        return self._entry_ids.get(key)


class EntityRegistry:
    """Class to hold a registry of entities."""

    entities: EntityRegistryItems

    def __init__(self, hass: HomeAssistant) -> None:
        """Initialize the registry."""
        self.hass = hass
        self._store = EntityRegistryStore(
            hass,
            STORAGE_VERSION_MAJOR,
            STORAGE_KEY,
            atomic_writes=True,
            minor_version=STORAGE_VERSION_MINOR,
        )
        self.hass.bus.async_listen(
            EVENT_DEVICE_REGISTRY_UPDATED, self.async_device_modified
        )

    @callback
    def async_get_device_class_lookup(
        self, domain_device_classes: set[tuple[str, str | None]]
    ) -> dict[str, dict[tuple[str, str | None], str]]:
        """Return a lookup of entity ids for devices which have matching entities.

        Entities must match a set of (domain, device_class) tuples.
        The result is indexed by device_id, then by the matching (domain, device_class)
        """
        lookup: dict[str, dict[tuple[str, str | None], str]] = {}
        for entity in self.entities.values():
            if not entity.device_id:
                continue
            device_class = entity.device_class or entity.original_device_class
            domain_device_class = (entity.domain, device_class)
            if domain_device_class not in domain_device_classes:
                continue
            if entity.device_id not in lookup:
                lookup[entity.device_id] = {domain_device_class: entity.entity_id}
            else:
                lookup[entity.device_id][domain_device_class] = entity.entity_id
        return lookup

    @callback
    def async_is_registered(self, entity_id: str) -> bool:
        """Check if an entity_id is currently registered."""
        return entity_id in self.entities

    @callback
    def async_get(self, entity_id: str) -> RegistryEntry | None:
        """Get EntityEntry for an entity_id."""
        return self.entities.get(entity_id)

    @callback
    def async_get_entity_id(
        self, domain: str, platform: str, unique_id: str
    ) -> str | None:
        """Check if an entity_id is currently registered."""
        return self.entities.get_entity_id((domain, platform, unique_id))

    @callback
    def async_generate_entity_id(
        self,
        domain: str,
        suggested_object_id: str,
        known_object_ids: Iterable[str] | None = None,
    ) -> str:
        """Generate an entity ID that does not conflict.

        Conflicts checked against registered and currently existing entities.
        """
        preferred_string = f"{domain}.{slugify(suggested_object_id)}"

        if len(domain) > MAX_LENGTH_STATE_DOMAIN:
            raise MaxLengthExceeded(domain, "domain", MAX_LENGTH_STATE_DOMAIN)

        test_string = preferred_string[:MAX_LENGTH_STATE_ENTITY_ID]
        if not known_object_ids:
            known_object_ids = {}

        tries = 1
        while (
            test_string in self.entities
            or test_string in known_object_ids
            or not self.hass.states.async_available(test_string)
        ):
            tries += 1
            len_suffix = len(str(tries)) + 1
            test_string = (
                f"{preferred_string[:MAX_LENGTH_STATE_ENTITY_ID-len_suffix]}_{tries}"
            )

        return test_string

    @callback
    def async_get_or_create(
        self,
        domain: str,
        platform: str,
        unique_id: str,
        *,
        # To influence entity ID generation
        known_object_ids: Iterable[str] | None = None,
        suggested_object_id: str | None = None,
        # To disable or hide an entity if it gets created
        disabled_by: RegistryEntryDisabler | None = None,
        hidden_by: RegistryEntryHider | None = None,
        # Data that we want entry to have
        area_id: str | None = None,
        capabilities: Mapping[str, Any] | None = None,
        config_entry: ConfigEntry | None = None,
        device_id: str | None = None,
        entity_category: EntityCategory | None = None,
        original_device_class: str | None = None,
        original_icon: str | None = None,
        original_name: str | None = None,
        supported_features: int | None = None,
        unit_of_measurement: str | None = None,
    ) -> RegistryEntry:
        """Get entity. Create if it doesn't exist."""
        config_entry_id = None
        if config_entry:
            config_entry_id = config_entry.entry_id

        entity_id = self.async_get_entity_id(domain, platform, unique_id)

        if entity_id:
            return self.async_update_entity(
                entity_id,
                area_id=area_id or UNDEFINED,
                capabilities=capabilities or UNDEFINED,
                config_entry_id=config_entry_id or UNDEFINED,
                device_id=device_id or UNDEFINED,
                entity_category=entity_category or UNDEFINED,
                original_device_class=original_device_class or UNDEFINED,
                original_icon=original_icon or UNDEFINED,
                original_name=original_name or UNDEFINED,
                supported_features=supported_features or UNDEFINED,
                unit_of_measurement=unit_of_measurement or UNDEFINED,
                # When we changed our slugify algorithm, we invalidated some
                # stored entity IDs with either a __ or ending in _.
                # Fix introduced in 0.86 (Jan 23, 2019). Next line can be
                # removed when we release 1.0 or in 2020.
                new_entity_id=".".join(
                    slugify(part) for part in entity_id.split(".", 1)
                ),
            )

        entity_id = self.async_generate_entity_id(
            domain, suggested_object_id or f"{platform}_{unique_id}", known_object_ids
        )

        if disabled_by and not isinstance(disabled_by, RegistryEntryDisabler):
            raise ValueError("disabled_by must be a RegistryEntryDisabler value")

        if (
            disabled_by is None
            and config_entry
            and config_entry.pref_disable_new_entities
        ):
            disabled_by = RegistryEntryDisabler.INTEGRATION

        from .entity import EntityCategory  # pylint: disable=import-outside-toplevel

        if entity_category and not isinstance(entity_category, EntityCategory):
            raise ValueError("entity_category must be a valid EntityCategory instance")

        entry = RegistryEntry(
            area_id=area_id,
            capabilities=capabilities,
            config_entry_id=config_entry_id,
            device_id=device_id,
            disabled_by=disabled_by,
            entity_category=entity_category,
            entity_id=entity_id,
            hidden_by=hidden_by,
            original_device_class=original_device_class,
            original_icon=original_icon,
            original_name=original_name,
            platform=platform,
            supported_features=supported_features or 0,
            unique_id=unique_id,
            unit_of_measurement=unit_of_measurement,
        )
        self.entities[entity_id] = entry
        _LOGGER.info("Registered new %s.%s entity: %s", domain, platform, entity_id)
        self.async_schedule_save()

        self.hass.bus.async_fire(
            EVENT_ENTITY_REGISTRY_UPDATED, {"action": "create", "entity_id": entity_id}
        )

        return entry

    @callback
    def async_remove(self, entity_id: str) -> None:
        """Remove an entity from registry."""
        self.entities.pop(entity_id)
        self.hass.bus.async_fire(
            EVENT_ENTITY_REGISTRY_UPDATED, {"action": "remove", "entity_id": entity_id}
        )
        self.async_schedule_save()

    @callback
    def async_device_modified(self, event: Event) -> None:
        """Handle the removal or update of a device.

        Remove entities from the registry that are associated to a device when
        the device is removed.

        Disable entities in the registry that are associated to a device when
        the device is disabled.
        """
        if event.data["action"] == "remove":
            entities = async_entries_for_device(
                self, event.data["device_id"], include_disabled_entities=True
            )
            for entity in entities:
                self.async_remove(entity.entity_id)
            return

        if event.data["action"] != "update":
            # Ignore "create" action
            return

        device_registry = dr.async_get(self.hass)
        device = device_registry.async_get(event.data["device_id"])

        # The device may be deleted already if the event handling is late, do nothing
        # in that case. Entities will be removed when we get the "remove" event.
        if not device:
            return

        # Remove entities which belong to config entries no longer associated with the
        # device
        entities = async_entries_for_device(
            self, event.data["device_id"], include_disabled_entities=True
        )
        for entity in entities:
            if (
                entity.config_entry_id is not None
                and entity.config_entry_id not in device.config_entries
            ):
                self.async_remove(entity.entity_id)

        # Re-enable disabled entities if the device is no longer disabled
        if not device.disabled:
            entities = async_entries_for_device(
                self, event.data["device_id"], include_disabled_entities=True
            )
            for entity in entities:
                if entity.disabled_by is not RegistryEntryDisabler.DEVICE:
                    continue
                self.async_update_entity(entity.entity_id, disabled_by=None)
            return

        # Ignore device disabled by config entry, this is handled by
        # async_config_entry_disabled
        if device.disabled_by is dr.DeviceEntryDisabler.CONFIG_ENTRY:
            return

        # Fetch entities which are not already disabled and disable them
        entities = async_entries_for_device(self, event.data["device_id"])
        for entity in entities:
            self.async_update_entity(
                entity.entity_id, disabled_by=RegistryEntryDisabler.DEVICE
            )

    @callback
    def _async_update_entity(
        self,
        entity_id: str,
        *,
        area_id: str | None | UndefinedType = UNDEFINED,
        capabilities: Mapping[str, Any] | None | UndefinedType = UNDEFINED,
        config_entry_id: str | None | UndefinedType = UNDEFINED,
        device_class: str | None | UndefinedType = UNDEFINED,
        device_id: str | None | UndefinedType = UNDEFINED,
        disabled_by: RegistryEntryDisabler | None | UndefinedType = UNDEFINED,
        entity_category: EntityCategory | None | UndefinedType = UNDEFINED,
        hidden_by: RegistryEntryHider | None | UndefinedType = UNDEFINED,
        icon: str | None | UndefinedType = UNDEFINED,
        name: str | None | UndefinedType = UNDEFINED,
        new_entity_id: str | UndefinedType = UNDEFINED,
        new_unique_id: str | UndefinedType = UNDEFINED,
        original_device_class: str | None | UndefinedType = UNDEFINED,
        original_icon: str | None | UndefinedType = UNDEFINED,
        original_name: str | None | UndefinedType = UNDEFINED,
        supported_features: int | UndefinedType = UNDEFINED,
        unit_of_measurement: str | None | UndefinedType = UNDEFINED,
        platform: str | None | UndefinedType = UNDEFINED,
        options: Mapping[str, Mapping[str, Any]] | UndefinedType = UNDEFINED,
    ) -> RegistryEntry:
        """Private facing update properties method."""
        old = self.entities[entity_id]

        new_values: dict[str, Any] = {}  # Dict with new key/value pairs
        old_values: dict[str, Any] = {}  # Dict with old key/value pairs

        if (
            disabled_by
            and disabled_by is not UNDEFINED
            and not isinstance(disabled_by, RegistryEntryDisabler)
        ):
            raise ValueError("disabled_by must be a RegistryEntryDisabler value")

        from .entity import EntityCategory  # pylint: disable=import-outside-toplevel

        if (
            entity_category
            and entity_category is not UNDEFINED
            and not isinstance(entity_category, EntityCategory)
        ):
            raise ValueError("entity_category must be a valid EntityCategory instance")

        for attr_name, value in (
            ("area_id", area_id),
            ("capabilities", capabilities),
            ("config_entry_id", config_entry_id),
            ("device_class", device_class),
            ("device_id", device_id),
            ("disabled_by", disabled_by),
            ("entity_category", entity_category),
            ("hidden_by", hidden_by),
            ("icon", icon),
            ("name", name),
            ("original_device_class", original_device_class),
            ("original_icon", original_icon),
            ("original_name", original_name),
            ("supported_features", supported_features),
            ("unit_of_measurement", unit_of_measurement),
            ("platform", platform),
            ("options", options),
        ):
            if value is not UNDEFINED and value != getattr(old, attr_name):
                new_values[attr_name] = value
                old_values[attr_name] = getattr(old, attr_name)

        if new_entity_id is not UNDEFINED and new_entity_id != old.entity_id:
            if self.async_is_registered(new_entity_id):
                raise ValueError("Entity with this ID is already registered")

            if not valid_entity_id(new_entity_id):
                raise ValueError("Invalid entity ID")

            if split_entity_id(new_entity_id)[0] != split_entity_id(entity_id)[0]:
                raise ValueError("New entity ID should be same domain")

            self.entities.pop(entity_id)
            entity_id = new_values["entity_id"] = new_entity_id
            old_values["entity_id"] = old.entity_id

        if new_unique_id is not UNDEFINED:
            conflict_entity_id = self.async_get_entity_id(
                old.domain, old.platform, new_unique_id
            )
            if conflict_entity_id:
                raise ValueError(
                    f"Unique id '{new_unique_id}' is already in use by "
                    f"'{conflict_entity_id}'"
                )
            new_values["unique_id"] = new_unique_id
            old_values["unique_id"] = old.unique_id

        if not new_values:
            return old

        new = self.entities[entity_id] = attr.evolve(old, **new_values)

        self.async_schedule_save()

        data: dict[str, str | dict[str, Any]] = {
            "action": "update",
            "entity_id": entity_id,
            "changes": old_values,
        }

        if old.entity_id != entity_id:
            data["old_entity_id"] = old.entity_id

        self.hass.bus.async_fire(EVENT_ENTITY_REGISTRY_UPDATED, data)

        return new

    @callback
    def async_update_entity(
        self,
        entity_id: str,
        *,
        area_id: str | None | UndefinedType = UNDEFINED,
        capabilities: Mapping[str, Any] | None | UndefinedType = UNDEFINED,
        config_entry_id: str | None | UndefinedType = UNDEFINED,
        device_class: str | None | UndefinedType = UNDEFINED,
        device_id: str | None | UndefinedType = UNDEFINED,
        disabled_by: RegistryEntryDisabler | None | UndefinedType = UNDEFINED,
        entity_category: EntityCategory | None | UndefinedType = UNDEFINED,
        hidden_by: RegistryEntryHider | None | UndefinedType = UNDEFINED,
        icon: str | None | UndefinedType = UNDEFINED,
        name: str | None | UndefinedType = UNDEFINED,
        new_entity_id: str | UndefinedType = UNDEFINED,
        new_unique_id: str | UndefinedType = UNDEFINED,
        original_device_class: str | None | UndefinedType = UNDEFINED,
        original_icon: str | None | UndefinedType = UNDEFINED,
        original_name: str | None | UndefinedType = UNDEFINED,
        supported_features: int | UndefinedType = UNDEFINED,
        unit_of_measurement: str | None | UndefinedType = UNDEFINED,
    ) -> RegistryEntry:
        """Update properties of an entity."""
        return self._async_update_entity(
            entity_id,
            area_id=area_id,
            capabilities=capabilities,
            config_entry_id=config_entry_id,
            device_class=device_class,
            device_id=device_id,
            disabled_by=disabled_by,
            entity_category=entity_category,
            hidden_by=hidden_by,
            icon=icon,
            name=name,
            new_entity_id=new_entity_id,
            new_unique_id=new_unique_id,
            original_device_class=original_device_class,
            original_icon=original_icon,
            original_name=original_name,
            supported_features=supported_features,
            unit_of_measurement=unit_of_measurement,
        )

    @callback
    def async_update_entity_platform(
        self,
        entity_id: str,
        new_platform: str,
        *,
        new_config_entry_id: str | UndefinedType = UNDEFINED,
        new_unique_id: str | UndefinedType = UNDEFINED,
        new_device_id: str | None | UndefinedType = UNDEFINED,
    ) -> RegistryEntry:
        """
        Update entity platform.

        This should only be used when an entity needs to be migrated between
        integrations.
        """
        if (
            state := self.hass.states.get(entity_id)
        ) is not None and state.state != STATE_UNKNOWN:
            raise ValueError("Only entities that haven't been loaded can be migrated")

        old = self.entities[entity_id]
        if new_config_entry_id == UNDEFINED and old.config_entry_id is not None:
            raise ValueError(
                f"new_config_entry_id required because {entity_id} is already linked "
                "to a config entry"
            )

        return self._async_update_entity(
            entity_id,
            new_unique_id=new_unique_id,
            config_entry_id=new_config_entry_id,
            device_id=new_device_id,
            platform=new_platform,
        )

    @callback
    def async_update_entity_options(
        self, entity_id: str, domain: str, options: dict[str, Any]
    ) -> RegistryEntry:
        """Update entity options."""
        old = self.entities[entity_id]
        new_options: Mapping[str, Mapping[str, Any]] = {**old.options, domain: options}
        return self._async_update_entity(entity_id, options=new_options)

    async def async_load(self) -> None:
        """Load the entity registry."""
        async_setup_entity_restore(self.hass, self)

        data = await storage.async_migrator(
            self.hass,
            self.hass.config.path(PATH_REGISTRY),
            self._store,
            old_conf_load_func=load_yaml,
            old_conf_migrate_func=_async_migrate_yaml_to_json,
        )
        entities = EntityRegistryItems()

        from .entity import EntityCategory  # pylint: disable=import-outside-toplevel

        if data is not None:
            for entity in data["entities"]:
                # Some old installations can have some bad entities.
                # Filter them out as they cause errors down the line.
                # Can be removed in Jan 2021
                if not valid_entity_id(entity["entity_id"]):
                    continue

                entities[entity["entity_id"]] = RegistryEntry(
                    area_id=entity["area_id"],
                    capabilities=entity["capabilities"],
                    config_entry_id=entity["config_entry_id"],
                    device_class=entity["device_class"],
                    device_id=entity["device_id"],
                    disabled_by=RegistryEntryDisabler(entity["disabled_by"])
                    if entity["disabled_by"]
                    else None,
                    entity_category=EntityCategory(entity["entity_category"])
                    if entity["entity_category"]
                    else None,
                    entity_id=entity["entity_id"],
                    hidden_by=entity["hidden_by"],
                    icon=entity["icon"],
                    id=entity["id"],
                    name=entity["name"],
                    options=entity["options"],
                    original_device_class=entity["original_device_class"],
                    original_icon=entity["original_icon"],
                    original_name=entity["original_name"],
                    platform=entity["platform"],
                    supported_features=entity["supported_features"],
                    unique_id=entity["unique_id"],
                    unit_of_measurement=entity["unit_of_measurement"],
                )

        self.entities = entities

    @callback
    def async_schedule_save(self) -> None:
        """Schedule saving the entity registry."""
        self._store.async_delay_save(self._data_to_save, SAVE_DELAY)

    @callback
    def _data_to_save(self) -> dict[str, Any]:
        """Return data of entity registry to store in a file."""
        data: dict[str, Any] = {}

        data["entities"] = [
            {
                "area_id": entry.area_id,
                "capabilities": entry.capabilities,
                "config_entry_id": entry.config_entry_id,
                "device_class": entry.device_class,
                "device_id": entry.device_id,
                "disabled_by": entry.disabled_by,
                "entity_category": entry.entity_category,
                "entity_id": entry.entity_id,
                "hidden_by": entry.hidden_by,
                "icon": entry.icon,
                "id": entry.id,
                "name": entry.name,
                "options": entry.options,
                "original_device_class": entry.original_device_class,
                "original_icon": entry.original_icon,
                "original_name": entry.original_name,
                "platform": entry.platform,
                "supported_features": entry.supported_features,
                "unique_id": entry.unique_id,
                "unit_of_measurement": entry.unit_of_measurement,
            }
            for entry in self.entities.values()
        ]

        return data

    @callback
    def async_clear_config_entry(self, config_entry: str) -> None:
        """Clear config entry from registry entries."""
        for entity_id in [
            entity_id
            for entity_id, entry in self.entities.items()
            if config_entry == entry.config_entry_id
        ]:
            self.async_remove(entity_id)

    @callback
    def async_clear_area_id(self, area_id: str) -> None:
        """Clear area id from registry entries."""
        for entity_id, entry in self.entities.items():
            if area_id == entry.area_id:
                self.async_update_entity(entity_id, area_id=None)


@callback
def async_get(hass: HomeAssistant) -> EntityRegistry:
    """Get entity registry."""
    return cast(EntityRegistry, hass.data[DATA_REGISTRY])


async def async_load(hass: HomeAssistant) -> None:
    """Load entity registry."""
    assert DATA_REGISTRY not in hass.data
    hass.data[DATA_REGISTRY] = EntityRegistry(hass)
    await hass.data[DATA_REGISTRY].async_load()


@bind_hass
async def async_get_registry(hass: HomeAssistant) -> EntityRegistry:
    """Get entity registry.

    This is deprecated and will be removed in the future. Use async_get instead.
    """
    return async_get(hass)


@callback
def async_entries_for_device(
    registry: EntityRegistry, device_id: str, include_disabled_entities: bool = False
) -> list[RegistryEntry]:
    """Return entries that match a device."""
    return [
        entry
        for entry in registry.entities.values()
        if entry.device_id == device_id
        and (not entry.disabled_by or include_disabled_entities)
    ]


@callback
def async_entries_for_area(
    registry: EntityRegistry, area_id: str
) -> list[RegistryEntry]:
    """Return entries that match an area."""
    return [entry for entry in registry.entities.values() if entry.area_id == area_id]


@callback
def async_entries_for_config_entry(
    registry: EntityRegistry, config_entry_id: str
) -> list[RegistryEntry]:
    """Return entries that match a config entry."""
    return [
        entry
        for entry in registry.entities.values()
        if entry.config_entry_id == config_entry_id
    ]


@callback
def async_config_entry_disabled_by_changed(
    registry: EntityRegistry, config_entry: ConfigEntry
) -> None:
    """Handle a config entry being disabled or enabled.

    Disable entities in the registry that are associated with a config entry when
    the config entry is disabled, enable entities in the registry that are associated
    with a config entry when the config entry is enabled and the entities are marked
    DISABLED_CONFIG_ENTRY.
    """

    entities = async_entries_for_config_entry(registry, config_entry.entry_id)

    if not config_entry.disabled_by:
        for entity in entities:
            if entity.disabled_by is not RegistryEntryDisabler.CONFIG_ENTRY:
                continue
            registry.async_update_entity(entity.entity_id, disabled_by=None)
        return

    for entity in entities:
        if entity.disabled:
            # Entity already disabled, do not overwrite
            continue
        registry.async_update_entity(
            entity.entity_id, disabled_by=RegistryEntryDisabler.CONFIG_ENTRY
        )


async def _async_migrate(
    old_major_version: int, old_minor_version: int, data: dict
) -> dict:
    """Migrate to the new version."""
    if old_major_version == 1 and old_minor_version < 2:
        # From version 1.1
        for entity in data["entities"]:
            # Populate all keys
            entity["area_id"] = entity.get("area_id")
            entity["capabilities"] = entity.get("capabilities") or {}
            entity["config_entry_id"] = entity.get("config_entry_id")
            entity["device_class"] = entity.get("device_class")
            entity["device_id"] = entity.get("device_id")
            entity["disabled_by"] = entity.get("disabled_by")
            entity["entity_category"] = entity.get("entity_category")
            entity["icon"] = entity.get("icon")
            entity["name"] = entity.get("name")
            entity["original_icon"] = entity.get("original_icon")
            entity["original_name"] = entity.get("original_name")
            entity["platform"] = entity["platform"]
            entity["supported_features"] = entity.get("supported_features", 0)
            entity["unit_of_measurement"] = entity.get("unit_of_measurement")

    if old_major_version == 1 and old_minor_version < 3:
        # Version 1.3 adds original_device_class
        for entity in data["entities"]:
            # Move device_class to original_device_class
            entity["original_device_class"] = entity["device_class"]
            entity["device_class"] = None

    if old_major_version == 1 and old_minor_version < 4:
        # Version 1.4 adds id
        for entity in data["entities"]:
            entity["id"] = uuid_util.random_uuid_hex()

    if old_major_version == 1 and old_minor_version < 5:
        # Version 1.5 adds entity options
        for entity in data["entities"]:
            entity["options"] = {}

    if old_major_version == 1 and old_minor_version < 6:
        # Version 1.6 adds hidden_by
        for entity in data["entities"]:
            entity["hidden_by"] = None

    if old_major_version > 1:
        raise NotImplementedError
    return data


async def _async_migrate_yaml_to_json(
    entities: dict[str, Any]
) -> dict[str, list[dict[str, Any]]]:
    """Migrate the YAML config file to storage helper format."""
    entities_1_1 = {
        "entities": [
            {"entity_id": entity_id, **info} for entity_id, info in entities.items()
        ]
    }
    return await _async_migrate(1, 1, entities_1_1)


@callback
def async_setup_entity_restore(hass: HomeAssistant, registry: EntityRegistry) -> None:
    """Set up the entity restore mechanism."""

    @callback
    def cleanup_restored_states_filter(event: Event) -> bool:
        """Clean up restored states filter."""
        return bool(event.data["action"] == "remove")

    @callback
    def cleanup_restored_states(event: Event) -> None:
        """Clean up restored states."""
        state = hass.states.get(event.data["entity_id"])

        if state is None or not state.attributes.get(ATTR_RESTORED):
            return

        hass.states.async_remove(event.data["entity_id"], context=event.context)

    hass.bus.async_listen(
        EVENT_ENTITY_REGISTRY_UPDATED,
        cleanup_restored_states,
        event_filter=cleanup_restored_states_filter,
    )

    if hass.is_running:
        return

    @callback
    def _write_unavailable_states(_: Event) -> None:
        """Make sure state machine contains entry for each registered entity."""
        existing = set(hass.states.async_entity_ids())

        for entry in registry.entities.values():
            if entry.entity_id in existing or entry.disabled:
                continue

            entry.write_unavailable_state(hass)

    hass.bus.async_listen(EVENT_HOMEASSISTANT_START, _write_unavailable_states)


async def async_migrate_entries(
    hass: HomeAssistant,
    config_entry_id: str,
    entry_callback: Callable[[RegistryEntry], dict[str, Any] | None],
) -> None:
    """Migrator of unique IDs."""
    ent_reg = await async_get_registry(hass)

    for entry in ent_reg.entities.values():
        if entry.config_entry_id != config_entry_id:
            continue

        updates = entry_callback(entry)

        if updates is not None:
            ent_reg.async_update_entity(entry.entity_id, **updates)


@callback
def async_validate_entity_id(registry: EntityRegistry, entity_id_or_uuid: str) -> str:
    """Validate and resolve an entity id or UUID to an entity id.

    Raises vol.Invalid if the entity or UUID is invalid, or if the UUID is not
    associated with an entity registry item.
    """
    if valid_entity_id(entity_id_or_uuid):
        return entity_id_or_uuid
    if (entry := registry.entities.get_entry(entity_id_or_uuid)) is None:
        raise vol.Invalid(f"Unknown entity registry entry {entity_id_or_uuid}")
    return entry.entity_id


@callback
def async_resolve_entity_id(
    registry: EntityRegistry, entity_id_or_uuid: str
) -> str | None:
    """Validate and resolve an entity id or UUID to an entity id.

    Returns None if the entity or UUID is invalid, or if the UUID is not
    associated with an entity registry item.
    """
    if valid_entity_id(entity_id_or_uuid):
        return entity_id_or_uuid
    if (entry := registry.entities.get_entry(entity_id_or_uuid)) is None:
        return None
    return entry.entity_id


@callback
def async_validate_entity_ids(
    registry: EntityRegistry, entity_ids_or_uuids: list[str]
) -> list[str]:
    """Validate and resolve a list of entity ids or UUIDs to a list of entity ids.

    Returns a list with UUID resolved to entity_ids.
    Raises vol.Invalid if any item is invalid, or if any a UUID is not associated with
    an entity registry item.
    """

    return [async_validate_entity_id(registry, item) for item in entity_ids_or_uuids]