# -*- coding: utf-8 -*- #
# Copyright 2021 Google Inc. 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,
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"""Command to remove an IAM policy binding on a Data Fusion instance."""

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

from googlecloudsdk.api_lib.data_fusion import datafusion as df
from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.data_fusion import data_fusion_iam_util
from googlecloudsdk.command_lib.data_fusion import resource_args
from googlecloudsdk.command_lib.iam import iam_util


class RemoveIamPolicyBinding(base.Command):
  r"""Removes an IAM policy binding to a Cloud Data Fusion instance.

  ## EXAMPLES

  To set someone@example.com to have `roles/datafusion.admin` permission for
  instance `my-instance` in project `my-project`, location in `my-location`,
  run:

  $ {command} my-instance --location=my-location \
    --member=user:someone@example.com --role=roles/datafusion.admin

  To run the same command for a specific namespace on the instance, run:

  $ {command} my-instance --location=my-location \
    --member=user:someone@example.com --role=roles/datafusion.admin \
    --namespace=my-namespace
  """

  @staticmethod
  def Args(parser):
    resource_args.AddInstanceResourceArg(parser,
                                         'Instance to remove IAM binding.')
    base.URI_FLAG.RemoveFromParser(parser)

    iam_util.AddArgsForRemoveIamPolicyBinding(parser)
    parser.add_argument(
        '--namespace',
        help='CDAP Namespace whose IAM policy we wish to remove. '
        'For example: `--namespace=my-namespace`.')

  def Run(self, args):
    datafusion = df.Datafusion()
    instance_ref = args.CONCEPTS.instance.Parse()

    if not args.namespace:
      get_request = datafusion.messages.DatafusionProjectsLocationsInstancesGetIamPolicyRequest(
          resource=instance_ref.RelativeName())
      iam_policy = datafusion.client.projects_locations_instances.GetIamPolicy(
          get_request)
    else:
      get_request = datafusion.messages.DatafusionProjectsLocationsInstancesNamespacesGetIamPolicyRequest(
          resource='%s/namespaces/%s' %
          (instance_ref.RelativeName(), args.namespace))
      iam_policy = datafusion.client.projects_locations_instances_namespaces.GetIamPolicy(
          get_request)

    iam_util.RemoveBindingFromIamPolicy(iam_policy, args.member, args.role)
    results = data_fusion_iam_util.DoSetIamPolicy(instance_ref, args.namespace,
                                                  iam_policy,
                                                  datafusion.messages,
                                                  datafusion.client)
    return results