# -*- coding: utf-8 -*- #
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#
# 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
#
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"""Command for adding an element to an existing named set of a Compute Engine router."""

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

from googlecloudsdk.api_lib.compute import base_classes
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.compute import flags as compute_flags
from googlecloudsdk.command_lib.compute.routers import flags


@base.Hidden
@base.UniverseCompatible
@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class AddNamedSetElement(base.UpdateCommand):
  """Adds an element to an existing named set of a Compute Engine router."""

  ROUTER_ARG = None

  @classmethod
  def Args(cls, parser):
    AddNamedSetElement.ROUTER_ARG = flags.RouterArgument()
    AddNamedSetElement.ROUTER_ARG.AddArgument(parser, operation_type='update')
    parser.add_argument(
        '--set-name',
        help="""Name of the set.""",
        required=True,
    )
    parser.add_argument(
        '--new-set-element',
        help="""CEL expression for the element.""",
        required=True,
    )

  def Run(self, args):
    holder = base_classes.ComputeApiHolder(self.ReleaseTrack())
    client = holder.client
    messages = holder.client.messages
    service = holder.client.apitools_client.routers

    router_ref = AddNamedSetElement.ROUTER_ARG.ResolveAsResource(
        args,
        holder.resources,
        scope_lister=compute_flags.GetDefaultScopeLister(client),
    )
    named_set = service.GetNamedSet(
        messages.ComputeRoutersGetNamedSetRequest(
            **router_ref.AsDict(), namedSet=args.set_name
        )
    ).resource
    new_element = messages.Expr(expression=args.new_set_element)
    named_set.elements.append(new_element)
    request = (
        service,
        'PatchNamedSet',
        messages.ComputeRoutersPatchNamedSetRequest(
            **router_ref.AsDict(),
            namedSet=named_set,
        ),
    )
    return client.MakeRequests([request])[0]