# Copyright 2017 AT&T Intellectual Property.  All other 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 promenade.control.base import BaseResource
from promenade.builder import Builder
from promenade.config import Configuration
from promenade import logging
import falcon
import kubernetes
import random

LOG = logging.getLogger(__name__)


class JoinScriptsResource(BaseResource):
    """
    Lists the versions supported by this API
    """

    def on_get(self, req, resp):
        design_ref = req.get_param('design_ref', required=True)
        ip = req.get_param('ip', required=True)
        hostname = req.get_param('hostname', required=True)

        dynamic_labels = _get_param_list(req, 'labels.dynamic')
        static_labels = _get_param_list(req, 'labels.static')

        join_ip = _get_join_ip()

        config = Configuration.from_design_ref(design_ref)
        node_document = {
            'schema': 'promenade/KubernetesNode/v1',
            'metadata': {
                'name': hostname,
                'schema': 'metadata/Document/v1',
                'layeringDefinition': {
                    'abstract': False,
                    'layer': 'site'
                },
            },
            'data': {
                'hostname': hostname,
                'ip': ip,
                'join_ip': join_ip,
                'labels': {
                    'dynamic': dynamic_labels,
                    'static': static_labels,
                },
            },
        }
        config.append(node_document)

        builder = Builder(config)
        script = builder.build_node_script(hostname)

        resp.body = script
        resp.content_type = 'text/x-shellscript'
        resp.status = falcon.HTTP_200


def _get_join_ip():
    # TODO(mark-burnett): Handle errors
    kubernetes.config.load_incluster_config()
    client = kubernetes.client.CoreV1Api()
    response = client.list_node(label_selector='kubernetes-apiserver=enabled')

    # Ignore bandit false positive: B311:blacklist
    # The choice of which master to join to is a load-balancing concern, not a
    # security concern.
    return random.choice(list(map(_extract_ip, response.items)))  # nosec


def _extract_ip(item):
    for address in item.status.addresses:
        if address.type == 'InternalIP':
            return address.address


def _get_param_list(req, name):
    values = req.get_param_as_list(name)
    if values:
        return values
    else:
        return []