# Copyright 2016 Red Hat, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import print_function

import uuid

from tripleoclient.exceptions import InvalidConfiguration
from tripleoclient.workflows import base


def delete_node(clients, **workflow_input):

    workflow_client = clients.workflow_engine
    tripleoclients = clients.tripleoclient
    queue_name = workflow_input['queue_name']

    execution = base.start_workflow(
        workflow_client,
        'tripleo.scale.v1.delete_node',
        workflow_input=workflow_input
    )

    with tripleoclients.messaging_websocket(queue_name) as ws:
        rtn_message = ws.wait_for_message(execution.id)
        if rtn_message['status'] != "SUCCESS":
            raise InvalidConfiguration(rtn_message['message'])


def scale_down(clients, plan_name, nodes, timeout=None):
    """Deletes overcloud nodes from a heat stack.

    :param clients: openstack clients
    :param plan_name: name of the container holding the plan data
    :param nodes: list of node id's to remove from the stack
    :param timeout: timeout for stack update operation
    """

    workflow_input = {
        "container": plan_name,
        "nodes": nodes,
        "queue_name": str(uuid.uuid4()),
    }

    if timeout is not None:
        workflow_input['timeout'] = timeout

    delete_node(clients, **workflow_input)