"""Offer API to configure Home Assistant auth."""
import voluptuous as vol

from homeassistant.core import callback
from homeassistant.components import websocket_api
from homeassistant.components.websocket_api.decorators import require_owner


WS_TYPE_LIST = 'config/auth/list'
SCHEMA_WS_LIST = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend({
    vol.Required('type'): WS_TYPE_LIST,
})

WS_TYPE_DELETE = 'config/auth/delete'
SCHEMA_WS_DELETE = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend({
    vol.Required('type'): WS_TYPE_DELETE,
    vol.Required('user_id'): str,
})

WS_TYPE_CREATE = 'config/auth/create'
SCHEMA_WS_CREATE = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend({
    vol.Required('type'): WS_TYPE_CREATE,
    vol.Required('name'): str,
})


async def async_setup(hass):
    """Enable the Home Assistant views."""
    hass.components.websocket_api.async_register_command(
        WS_TYPE_LIST, websocket_list,
        SCHEMA_WS_LIST
    )
    hass.components.websocket_api.async_register_command(
        WS_TYPE_DELETE, websocket_delete,
        SCHEMA_WS_DELETE
    )
    hass.components.websocket_api.async_register_command(
        WS_TYPE_CREATE, websocket_create,
        SCHEMA_WS_CREATE
    )
    return True


@callback
@require_owner
def websocket_list(hass, connection, msg):
    """Return a list of users."""
    async def send_users():
        """Send users."""
        result = [_user_info(u) for u in await hass.auth.async_get_users()]

        connection.send_message(
            websocket_api.result_message(msg['id'], result))

    hass.async_add_job(send_users())


@callback
@require_owner
def websocket_delete(hass, connection, msg):
    """Delete a user."""
    async def delete_user():
        """Delete user."""
        if msg['user_id'] == connection.user.id:
            connection.send_message(websocket_api.error_message(
                msg['id'], 'no_delete_self',
                'Unable to delete your own account'))
            return

        user = await hass.auth.async_get_user(msg['user_id'])

        if not user:
            connection.send_message(websocket_api.error_message(
                msg['id'], 'not_found', 'User not found'))
            return

        await hass.auth.async_remove_user(user)

        connection.send_message(
            websocket_api.result_message(msg['id']))

    hass.async_add_job(delete_user())


@callback
@require_owner
def websocket_create(hass, connection, msg):
    """Create a user."""
    async def create_user():
        """Create a user."""
        user = await hass.auth.async_create_user(msg['name'])

        connection.send_message(
            websocket_api.result_message(msg['id'], {
                'user': _user_info(user)
            }))

    hass.async_add_job(create_user())


def _user_info(user):
    """Format a user."""
    return {
        'id': user.id,
        'name': user.name,
        'is_owner': user.is_owner,
        'is_active': user.is_active,
        'system_generated': user.system_generated,
        'credentials': [
            {
                'type': c.auth_provider_type,
            } for c in user.credentials
        ]
    }