#
# Copyright 2019 Google LLC
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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 google.auth
import google_auth_httplib2
import googleapiclient.discovery
from googleapiclient.errors import HttpError
import googleapiclient.http

USER_AGENT = "cloud-solutions/gce-automated-ad-join-v2"

class Project(object):
    def __init__(self, project_id):
        credentials, _ = google.auth.default()
        
        auth_http = google_auth_httplib2.AuthorizedHttp(credentials)
        googleapiclient .http.set_user_agent(auth_http, USER_AGENT)

        self.__project_id = project_id
        self.__gce_client = googleapiclient.discovery.build('compute', 'v1', http=auth_http)

    def get_zones(self):
        page_token = None
        zones = []

        while True:
            result = self.__gce_client.zones().list(
                project=self.__project_id,
                pageToken=page_token).execute()
            zones += [item["name"] for item in result["items"]]

            if not page_token:
                break

        return zones

    def get_instance(self, name, zone):
        try:
            computer = self.__gce_client.instances().get(
                project=self.__project_id,
                zone=zone,
                instance=name).execute()
            return computer
        except HttpError as e:
            # Ignore 404 (Not Found) and return without result. Report all other errors
            if e.resp.status == 404:
                return
            raise

    def get_managed_instance_group(self, group_name, zone, region):
        try:
            if zone:
                result = self.__gce_client.instanceGroupManagers().get(
                    project=self.__project_id,
                    zone=zone,
                    instanceGroupManager=group_name).execute()
            else:
                result = self.__gce_client.regionInstanceGroupManagers().get(
                    project=self.__project_id,
                    region=region,
                    instanceGroupManager=group_name).execute()
            return result
        except HttpError as e:
            # Ignore 404 (Not Found) and return without result. Report all other errors
            if e.resp.status == 404:
                return
            raise