#!/usr/bin/env python
# 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.
"""Sample command-line program to list Cloud Dataproc clusters in a region.

Example usage:
python list_clusters.py --project_id=my-project-id --region=global

"""
import argparse

from google.cloud import dataproc_v1
from google.cloud.dataproc_v1.gapic.transports import (
    cluster_controller_grpc_transport)


# [START dataproc_list_clusters]
def list_clusters(dataproc, project, region):
    """List the details of clusters in the region."""
    for cluster in dataproc.list_clusters(project, region):
        print(('{} - {}'.format(cluster.cluster_name,
                                cluster.status.State.Name(
                                    cluster.status.state))))
# [END dataproc_list_clusters]


def main(project_id, region):

    if region == 'global':
        # Use the default gRPC global endpoints.
        dataproc_cluster_client = dataproc_v1.ClusterControllerClient()
    else:
        # Use a regional gRPC endpoint. See:
        # https://cloud.google.com/dataproc/docs/concepts/regional-endpoints
        client_transport = (
            cluster_controller_grpc_transport.ClusterControllerGrpcTransport(
                address='{}-dataproc.googleapis.com:443'.format(region)))
        dataproc_cluster_client = dataproc_v1.ClusterControllerClient(
            client_transport)

    list_clusters(dataproc_cluster_client, project_id, region)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=(
            argparse.RawDescriptionHelpFormatter))
    parser.add_argument(
        '--project_id', help='Project ID to access.', required=True)
    parser.add_argument(
        '--region', help='Region of clusters to list.', required=True)

    args = parser.parse_args()
    main(args.project_id, args.region)