# -*- coding: utf-8 -*- #
# Copyright 2014 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.
"""Command for deleting snapshots."""

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

from googlecloudsdk.api_lib.compute import base_classes
from googlecloudsdk.api_lib.compute import utils
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.compute import flags as compute_flags
from googlecloudsdk.command_lib.compute import scope as compute_scope
from googlecloudsdk.command_lib.compute.snapshots import flags

REGIONAL_SNAPSHOT_COLLECTION = 'compute.regionSnapshots'
DELETE = 'Delete'

DETAILED_HELP = {
    'EXAMPLES':
        """\
        To delete Compute Engine snapshots with the names 'snapshot-1'
        and 'snapshot-2', run:

          $ {command} snapshot-1 snapshot-2

        To list all snapshots that were created before a specific date, use
        the --filter flag with the `{parent_command} list` command.

          $ {parent_command} list --filter="creationTimestamp<'2017-01-01'"

        For more information on how to use --filter with the list command,
        run $ gcloud topic filters.
        """,
}


def _GAArgs(parser):
  """A helper function to build args for GA API version."""
  Delete.SnapshotArg = flags.MakeSnapshotArg(plural=True)
  Delete.SnapshotArg.AddArgument(parser, operation_type='delete')


def _BetaArgs(parser):
  """A helper function to build args for Beta API version."""
  Delete.SnapshotArg = flags.MakeSnapshotArgForRegionalSnapshots(plural=True)
  Delete.SnapshotArg.AddArgument(parser, operation_type='delete')


def _AlphaArgs(parser):
  """A helper function to build args for Alpha API version."""
  Delete.SnapshotArg = flags.MakeSnapshotArgForRegionalSnapshots(plural=True)
  Delete.SnapshotArg.AddArgument(parser, operation_type='delete')


@base.ReleaseTracks(base.ReleaseTrack.GA)
@base.UniverseCompatible
class Delete(base.DeleteCommand):
  """Delete Compute Engine snapshots.

  *{command}* deletes one or more Compute Engine snapshots.
  """

  detailed_help = DETAILED_HELP

  @staticmethod
  def Args(parser):
    _GAArgs(parser)

  def Run(self, args):
    return self._Run(args)

  def _Run(self, args, support_region=False):
    holder = base_classes.ComputeApiHolder(self.ReleaseTrack())
    client = holder.client

    snapshot_refs = Delete.SnapshotArg.ResolveAsResource(
        args,
        holder.resources,
        scope_lister=compute_flags.GetDefaultScopeLister(client),
        default_scope=compute_scope.ScopeEnum.GLOBAL,
    )

    utils.PromptForDeletion(snapshot_refs)
    requests = []
    for snapshot_ref in snapshot_refs:
      if (
          support_region
          and snapshot_ref.Collection() == REGIONAL_SNAPSHOT_COLLECTION
      ):
        requests.append((
            client.apitools_client.regionSnapshots,
            DELETE,
            client.messages.ComputeRegionSnapshotsDeleteRequest(
                project=snapshot_ref.project,
                snapshot=snapshot_ref.snapshot,
                region=snapshot_ref.region,
            ),
        ))
      else:
        requests.append((
            client.apitools_client.snapshots,
            DELETE,
            client.messages.ComputeSnapshotsDeleteRequest(
                project=snapshot_ref.project, snapshot=snapshot_ref.snapshot
            ),
        ))

    return client.MakeRequests(requests)


@base.ReleaseTracks(base.ReleaseTrack.BETA)
class DeleteBeta(Delete):
  """Delete Compute Engine snapshots."""

  @staticmethod
  def Args(parser):
    _BetaArgs(parser)

  def Run(self, args):
    return self._Run(
        args,
        support_region=True,
    )


@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class DeleteAlpha(Delete):
  """Delete Compute Engine snapshots."""

  @staticmethod
  def Args(parser):
    _AlphaArgs(parser)

  def Run(self, args):
    return self._Run(
        args,
        support_region=True,
    )