"""HTTP views to interact with the entity registry."""
import voluptuous as vol

from homeassistant import config_entries
from homeassistant.components import websocket_api
from homeassistant.components.websocket_api.const import ERR_NOT_FOUND
from homeassistant.components.websocket_api.decorators import require_admin
from homeassistant.core import callback
from homeassistant.helpers import (
    config_validation as cv,
    device_registry as dr,
    entity_registry as er,
)


async def async_setup(hass):
    """Enable the Entity Registry views."""
    websocket_api.async_register_command(hass, websocket_list_entities)
    websocket_api.async_register_command(hass, websocket_get_entity)
    websocket_api.async_register_command(hass, websocket_update_entity)
    websocket_api.async_register_command(hass, websocket_remove_entity)
    return True


@websocket_api.websocket_command({vol.Required("type"): "config/entity_registry/list"})
@callback
def websocket_list_entities(hass, connection, msg):
    """Handle list registry entries command."""
    registry = er.async_get(hass)
    connection.send_message(
        websocket_api.result_message(
            msg["id"], [_entry_dict(entry) for entry in registry.entities.values()]
        )
    )


@websocket_api.websocket_command(
    {
        vol.Required("type"): "config/entity_registry/get",
        vol.Required("entity_id"): cv.entity_id,
    }
)
@callback
def websocket_get_entity(hass, connection, msg):
    """Handle get entity registry entry command.

    Async friendly.
    """
    registry = er.async_get(hass)

    if (entry := registry.entities.get(msg["entity_id"])) is None:
        connection.send_message(
            websocket_api.error_message(msg["id"], ERR_NOT_FOUND, "Entity not found")
        )
        return

    connection.send_message(
        websocket_api.result_message(msg["id"], _entry_ext_dict(entry))
    )


@require_admin
@websocket_api.websocket_command(
    {
        vol.Required("type"): "config/entity_registry/update",
        vol.Required("entity_id"): cv.entity_id,
        # If passed in, we update value. Passing None will remove old value.
        vol.Optional("area_id"): vol.Any(str, None),
        vol.Optional("device_class"): vol.Any(str, None),
        vol.Optional("icon"): vol.Any(str, None),
        vol.Optional("name"): vol.Any(str, None),
        vol.Optional("new_entity_id"): str,
        # We only allow setting disabled_by user via API.
        vol.Optional("disabled_by"): vol.Any(
            None,
            vol.All(
                vol.Coerce(er.RegistryEntryDisabler),
                er.RegistryEntryDisabler.USER.value,
            ),
        ),
        # We only allow setting hidden_by user via API.
        vol.Optional("hidden_by"): vol.Any(
            None,
            vol.All(
                vol.Coerce(er.RegistryEntryHider),
                er.RegistryEntryHider.USER.value,
            ),
        ),
        vol.Inclusive("options_domain", "entity_option"): str,
        vol.Inclusive("options", "entity_option"): vol.Any(None, dict),
    }
)
@callback
def websocket_update_entity(hass, connection, msg):
    """Handle update entity websocket command.

    Async friendly.
    """
    registry = er.async_get(hass)

    entity_id = msg["entity_id"]
    if not (entity_entry := registry.async_get(entity_id)):
        connection.send_message(
            websocket_api.error_message(msg["id"], ERR_NOT_FOUND, "Entity not found")
        )
        return

    changes = {}

    for key in ("area_id", "device_class", "disabled_by", "hidden_by", "icon", "name"):
        if key in msg:
            changes[key] = msg[key]

    if "new_entity_id" in msg and msg["new_entity_id"] != entity_id:
        changes["new_entity_id"] = msg["new_entity_id"]
        if hass.states.get(msg["new_entity_id"]) is not None:
            connection.send_message(
                websocket_api.error_message(
                    msg["id"],
                    "invalid_info",
                    "Entity with this ID is already registered",
                )
            )
            return

    if "disabled_by" in msg and msg["disabled_by"] is None:
        # Don't allow enabling an entity of a disabled device
        if entity_entry.device_id:
            device_registry = dr.async_get(hass)
            device = device_registry.async_get(entity_entry.device_id)
            if device.disabled:
                connection.send_message(
                    websocket_api.error_message(
                        msg["id"], "invalid_info", "Device is disabled"
                    )
                )
                return

    try:
        if changes:
            entity_entry = registry.async_update_entity(entity_id, **changes)
    except ValueError as err:
        connection.send_message(
            websocket_api.error_message(msg["id"], "invalid_info", str(err))
        )
        return

    if "new_entity_id" in msg:
        entity_id = msg["new_entity_id"]

    try:
        if "options_domain" in msg:
            entity_entry = registry.async_update_entity_options(
                entity_id, msg["options_domain"], msg["options"]
            )
    except ValueError as err:
        connection.send_message(
            websocket_api.error_message(msg["id"], "invalid_info", str(err))
        )
        return

    result = {"entity_entry": _entry_ext_dict(entity_entry)}
    if "disabled_by" in changes and changes["disabled_by"] is None:
        # Enabling an entity requires a config entry reload, or HA restart
        config_entry = hass.config_entries.async_get_entry(entity_entry.config_entry_id)
        if config_entry and not config_entry.supports_unload:
            result["require_restart"] = True
        else:
            result["reload_delay"] = config_entries.RELOAD_AFTER_UPDATE_DELAY
    connection.send_result(msg["id"], result)


@require_admin
@websocket_api.websocket_command(
    {
        vol.Required("type"): "config/entity_registry/remove",
        vol.Required("entity_id"): cv.entity_id,
    }
)
@callback
def websocket_remove_entity(hass, connection, msg):
    """Handle remove entity websocket command.

    Async friendly.
    """
    registry = er.async_get(hass)

    if msg["entity_id"] not in registry.entities:
        connection.send_message(
            websocket_api.error_message(msg["id"], ERR_NOT_FOUND, "Entity not found")
        )
        return

    registry.async_remove(msg["entity_id"])
    connection.send_message(websocket_api.result_message(msg["id"]))


@callback
def _entry_dict(entry):
    """Convert entry to API format."""
    return {
        "area_id": entry.area_id,
        "config_entry_id": entry.config_entry_id,
        "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,
        "name": entry.name,
        "platform": entry.platform,
    }


@callback
def _entry_ext_dict(entry):
    """Convert entry to API format."""
    data = _entry_dict(entry)
    data["capabilities"] = entry.capabilities
    data["device_class"] = entry.device_class
    data["options"] = entry.options
    data["original_device_class"] = entry.original_device_class
    data["original_icon"] = entry.original_icon
    data["original_name"] = entry.original_name
    data["unique_id"] = entry.unique_id
    return data