# -*- coding: utf-8 -*- #
# Copyright 2019 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.
"""Implements command to delete an ops agents policy."""

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

from apitools.base.py import exceptions as apitools_exceptions
from googlecloudsdk.api_lib.compute.instances.ops_agents import exceptions as ops_agents_exceptions
from googlecloudsdk.api_lib.compute.instances.ops_agents.validators import guest_policy_validator
from googlecloudsdk.api_lib.compute.os_config import utils as osconfig_api_utils
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.compute.instances.ops_agents.policies import parser_utils
from googlecloudsdk.command_lib.compute.os_config import utils as osconfig_command_utils
from googlecloudsdk.core import log
from googlecloudsdk.core import properties


@base.ReleaseTracks(base.ReleaseTrack.ALPHA)
class Delete(base.DeleteCommand):
  """Delete a Google Cloud's operations suite agents (Ops Agents) policy.

  *{command}* deletes a policy that facilitates agent management across
  Compute Engine instances based on user specified instance filters. This policy
  installs, specifies versioning, enables autoupgrade, and removes Ops Agents.

  The command returns a response indicating whether the deletion succeeded.
  After a policy is deleted, it takes 10-15 minutes to be wiped from the
  applicable instances. Deleting a policy does not delete any existing agents
  managed by that policy, but the agents become unmanaged by any policies. To
  remove the agents from the
  instances, first update the policy to set the agent ``package-state'' to
  ``removed'', wait for the policy to take effect, then delete the policy.
  """

  detailed_help = {
      'DESCRIPTION':
          '{description}',
      'EXAMPLES':
          """\
          To delete an Ops agents policy named ``ops-agents-test-policy'' in the
          current project, run:

            $ {command} ops-agents-test-policy
          """,
  }

  @staticmethod
  def Args(parser):
    """See base class."""
    parser_utils.AddSharedArgs(parser)

  def Run(self, args):
    """See base class."""
    release_track = self.ReleaseTrack()
    client = osconfig_api_utils.GetClientInstance(
        release_track, api_version_override='v1beta')
    messages = osconfig_api_utils.GetClientMessages(
        release_track, api_version_override='v1beta')
    project = properties.VALUES.core.project.GetOrFail()
    guest_policy_uri_path = osconfig_command_utils.GetGuestPolicyUriPath(
        'projects', project, args.POLICY_ID)
    service = client.projects_guestPolicies

    get_request = messages.OsconfigProjectsGuestPoliciesGetRequest(
        name=guest_policy_uri_path)
    try:
      get_response = service.Get(get_request)
    except apitools_exceptions.HttpNotFoundError:
      raise ops_agents_exceptions.PolicyNotFoundError(
          policy_id=args.POLICY_ID)
    if not guest_policy_validator.IsOpsAgentPolicy(get_response):
      raise ops_agents_exceptions.PolicyNotFoundError(
          policy_id=args.POLICY_ID)

    delete_request = messages.OsconfigProjectsGuestPoliciesDeleteRequest(
        name=guest_policy_uri_path)
    delete_response = service.Delete(delete_request)

    log.DeletedResource(args.POLICY_ID)
    return delete_response
