#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

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#  or more contributor license agreements.  See the NOTICE file
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#  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
#
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#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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#  under the License.

''' clusters.py '''
from heron.common.src.python.utils.log import Log
import heron.tools.explorer.src.python.args as args
import heron.tools.common.src.python.access.tracker_access as tracker_access


def create_parser(subparsers):
  """ create argument parser """
  parser = subparsers.add_parser(
      'clusters',
      help='Display existing clusters',
      usage="%(prog)s [options]",
      add_help=True)
  args.add_verbose(parser)
  args.add_tracker_url(parser)
  parser.set_defaults(subcommand='clusters')
  return subparsers

# pylint: disable=unused-argument,superfluous-parens
def run(command, parser, cl_args, unknown_args):
  """ run command """
  try:
    clusters = tracker_access.get_clusters()
  except:
    Log.error("Fail to connect to tracker: \'%s\'", cl_args["tracker_url"])
    return False
  print('Available clusters:')
  for cluster in clusters:
    print('  %s' % cluster)
  return True