#!/usr/bin/env python3

# Copyright 2015 The Kubernetes Authors.
#
# 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.

import os
import sys

from charmhelpers.core.hookenv import action_get
from charmhelpers.core.hookenv import action_set
from charmhelpers.core.hookenv import unit_public_ip
from charms.templating.jinja2 import render
from subprocess import call

os.environ['PATH'] += os.pathsep + os.path.join(os.sep, 'snap', 'bin')

context = {}
context['replicas'] = action_get('replicas')
context['delete'] = action_get('delete')
context['public_address'] = unit_public_ip()

if not context['replicas']:
    context['replicas'] = 3

# Declare a kubectl template when invoking kubectl
kubectl = ['kubectl', '--kubeconfig=/root/cdk/kubeconfig']

# Remove deployment if requested
if context['delete']:
    service_del = kubectl + ['delete', 'svc', 'microbot']
    service_response = call(service_del)
    deploy_del = kubectl + ['delete', 'deployment', 'microbot']
    deploy_response = call(deploy_del)
    ingress_del = kubectl + ['delete', 'ing', 'microbot-ingress']
    ingress_response = call(ingress_del)

    if ingress_response != 0:
        action_set({'microbot-ing':
                   'Failed removal of microbot ingress resource.'})
    if deploy_response != 0:
        action_set({'microbot-deployment':
                   'Failed removal of microbot deployment resource.'})
    if service_response != 0:
        action_set({'microbot-service':
                   'Failed removal of microbot service resource.'})
    sys.exit(0)

# Creation request

render('microbot-example.yaml', '/root/cdk/addons/microbot.yaml',
       context)

create_command = kubectl + ['create', '-f',
                            '/root/cdk/addons/microbot.yaml']

create_response = call(create_command)

if create_response == 0:
    action_set({'address':
               'microbot.{}.xip.io'.format(context['public_address'])})
else:
    action_set({'microbot-create': 'Failed microbot creation.'})