# -*- 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.
"""Utility methods for the compute node templates commands."""

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

from apitools.base.py import encoding
from googlecloudsdk.command_lib.compute.sole_tenancy.node_templates import flags
from googlecloudsdk.command_lib.util.apis import arg_utils
import six


def _ParseNodeAffinityLabels(affinity_labels, messages):
  affinity_labels_class = messages.NodeTemplate.NodeAffinityLabelsValue
  return encoding.DictToAdditionalPropertyMessage(
      affinity_labels, affinity_labels_class, sort_items=True)


def CreateNodeTemplate(node_template_ref,
                       args,
                       project,
                       region,
                       messages,
                       resource_parser,
                       enable_disk=False,
                       enable_accelerator=False):
  """Creates a Node Template message from args."""
  node_affinity_labels = None
  if args.node_affinity_labels:
    node_affinity_labels = _ParseNodeAffinityLabels(args.node_affinity_labels,
                                                    messages)

  node_type_flexbility = None
  if args.IsSpecified('node_requirements'):
    node_type_flexbility = messages.NodeTemplateNodeTypeFlexibility(
        cpus=six.text_type(args.node_requirements.get('vCPU', 'any')),
        # local SSD is unique because the user may omit the local SSD constraint
        # entirely to include the possibility of node types with no local SSD.
        # "any" corresponds to "greater than zero".
        localSsd=args.node_requirements.get('localSSD', None),
        memory=args.node_requirements.get('memory', 'any'))

  node_template = messages.NodeTemplate(
      name=node_template_ref.Name(),
      description=args.description,
      nodeAffinityLabels=node_affinity_labels,
      nodeType=args.node_type,
      nodeTypeFlexibility=node_type_flexbility)

  if enable_disk:
    if args.IsSpecified('disk'):
      local_disk = messages.LocalDisk(
          diskCount=args.disk.get('count'),
          diskSizeGb=args.disk.get('size'),
          diskType=args.disk.get('type'))
      node_template.disks = [local_disk]

  if args.IsSpecified('cpu_overcommit_type'):
    overcommit_type = arg_utils.ChoiceToEnum(
        args.cpu_overcommit_type,
        messages.NodeTemplate.CpuOvercommitTypeValueValuesEnum)
    node_template.cpuOvercommitType = overcommit_type

  if enable_accelerator:
    node_template.accelerators = GetAccelerators(args, messages,
                                                 resource_parser, project,
                                                 region)

  server_binding_flag = flags.GetServerBindingMapperFlag(messages)
  server_binding = messages.ServerBinding(
      type=server_binding_flag.GetEnumForChoice(args.server_binding))
  node_template.serverBinding = server_binding

  return node_template


def GetAccelerators(args, messages, resource_parser, project, region):
  """Returns list of messages with accelerators for the instance."""
  if args.accelerator:
    accelerator_type_name = args.accelerator['type']
    accelerator_type = ParseAcceleratorType(
        accelerator_type_name, resource_parser, project, region)
    # Accelerator count is default to 1.
    accelerator_count = int(args.accelerator.get('count', 1))
    return CreateAcceleratorConfigMessages(messages, accelerator_type,
                                           accelerator_count)
  return []


def CreateAcceleratorConfigMessages(msgs, accelerator_type, accelerator_count):
  """Returns a list of accelerator config messages.

  Args:
    msgs: tracked GCE API messages.
    accelerator_type: reference to the accelerator type.
    accelerator_count: number of accelerators to attach to the VM.

  Returns:
    a list of accelerator config message that specifies the type and number of
    accelerators to attach to an instance.
  """

  accelerator_config = msgs.AcceleratorConfig(
      acceleratorType=accelerator_type, acceleratorCount=accelerator_count)
  return [accelerator_config]


def ParseAcceleratorType(accelerator_type_name, resource_parser, project,
                         region):
  collection = 'compute.regionAcceleratorTypes'
  params = {'project': project, 'region': region}
  accelerator_type = resource_parser.Parse(
      accelerator_type_name, collection=collection, params=params).SelfLink()
  return accelerator_type
