# -*- coding: utf-8 -*- #
# Copyright 2018 Google LLC. All 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.
"""Flags for the `compute sole-tenancy` related commands."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from apitools.base.py import encoding
from googlecloudsdk.core import exceptions
from googlecloudsdk.core import yaml


class Error(exceptions.Error):
  """Exceptions for the sole tenancy util module."""


class NodeAffinityFileParseError(Error):
  """Exception for invalid node affinity file format."""


def GetSchedulingNodeAffinityListFromArgs(args, messages):
  """Returns a list of ScheduleNodeAffinity messages populated from args."""
  operator_enum = messages.SchedulingNodeAffinity.OperatorValueValuesEnum

  node_affinities = []
  if args.IsSpecified('node_affinity_file'):
    affinities_yaml = yaml.load(args.node_affinity_file)
    if not affinities_yaml:  # Catch empty files/lists.
      raise NodeAffinityFileParseError(
          'No node affinity labels specified. You must specify at least one '
          'label to create a sole tenancy instance.')
    for affinity in affinities_yaml:
      if not affinity:  # Catches None and empty dicts
        raise NodeAffinityFileParseError('Empty list item in JSON/YAML file.')
      try:
        node_affinity = encoding.PyValueToMessage(
            messages.SchedulingNodeAffinity, affinity)
      except Exception as e:  # pylint: disable=broad-except
        raise NodeAffinityFileParseError(e)
      if not node_affinity.key:
        raise NodeAffinityFileParseError(
            'A key must be specified for every node affinity label.')
      if node_affinity.all_unrecognized_fields():
        raise NodeAffinityFileParseError(
            'Key [{0}] has invalid field formats for: {1}'.format(
                node_affinity.key, node_affinity.all_unrecognized_fields()))

      node_affinities.append(node_affinity)
  if args.IsSpecified('node_group'):
    node_affinities.append(
        messages.SchedulingNodeAffinity(
            key='compute.googleapis.com/node-group-name',
            operator=operator_enum.IN,
            values=[args.node_group]))
  if args.IsSpecified('node'):
    node_affinities.append(
        messages.SchedulingNodeAffinity(
            key='compute.googleapis.com/node-name',
            operator=operator_enum.IN,
            values=[args.node]))
  return node_affinities
