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

from homeassistant.core import callback
from homeassistant.helpers.entity_registry import async_get_registry
from homeassistant.components import websocket_api
from homeassistant.components.websocket_api.const import ERR_NOT_FOUND
from homeassistant.components.websocket_api.decorators import (
    async_response,
    require_admin,
)
from homeassistant.helpers import config_validation as cv

WS_TYPE_LIST = "config/entity_registry/list"
SCHEMA_WS_LIST = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
    {vol.Required("type"): WS_TYPE_LIST}
)

WS_TYPE_GET = "config/entity_registry/get"
SCHEMA_WS_GET = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
    {vol.Required("type"): WS_TYPE_GET, vol.Required("entity_id"): cv.entity_id}
)

WS_TYPE_UPDATE = "config/entity_registry/update"
SCHEMA_WS_UPDATE = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
    {
        vol.Required("type"): WS_TYPE_UPDATE,
        vol.Required("entity_id"): cv.entity_id,
        # If passed in, we update value. Passing None will remove old value.
        vol.Optional("name"): vol.Any(str, None),
        vol.Optional("new_entity_id"): str,
    }
)

WS_TYPE_REMOVE = "config/entity_registry/remove"
SCHEMA_WS_REMOVE = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend(
    {vol.Required("type"): WS_TYPE_REMOVE, vol.Required("entity_id"): cv.entity_id}
)


async def async_setup(hass):
    """Enable the Entity Registry views."""
    hass.components.websocket_api.async_register_command(
        WS_TYPE_LIST, websocket_list_entities, SCHEMA_WS_LIST
    )
    hass.components.websocket_api.async_register_command(
        WS_TYPE_GET, websocket_get_entity, SCHEMA_WS_GET
    )
    hass.components.websocket_api.async_register_command(
        WS_TYPE_UPDATE, websocket_update_entity, SCHEMA_WS_UPDATE
    )
    hass.components.websocket_api.async_register_command(
        WS_TYPE_REMOVE, websocket_remove_entity, SCHEMA_WS_REMOVE
    )
    return True


@async_response
async def websocket_list_entities(hass, connection, msg):
    """Handle list registry entries command.

    Async friendly.
    """
    registry = await async_get_registry(hass)
    connection.send_message(
        websocket_api.result_message(
            msg["id"], [_entry_dict(entry) for entry in registry.entities.values()]
        )
    )


@async_response
async def websocket_get_entity(hass, connection, msg):
    """Handle get entity registry entry command.

    Async friendly.
    """
    registry = await async_get_registry(hass)
    entry = registry.entities.get(msg["entity_id"])

    if entry 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_dict(entry)))


@require_admin
@async_response
async def websocket_update_entity(hass, connection, msg):
    """Handle update entity websocket command.

    Async friendly.
    """
    registry = await async_get_registry(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

    changes = {}

    if "name" in msg:
        changes["name"] = msg["name"]

    if "new_entity_id" in msg and msg["new_entity_id"] != msg["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 is already registered"
                )
            )
            return

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


@require_admin
@async_response
async def websocket_remove_entity(hass, connection, msg):
    """Handle remove entity websocket command.

    Async friendly.
    """
    registry = await async_get_registry(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 {
        "config_entry_id": entry.config_entry_id,
        "device_id": entry.device_id,
        "disabled_by": entry.disabled_by,
        "entity_id": entry.entity_id,
        "name": entry.name,
        "platform": entry.platform,
    }
