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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.
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#    http://www.apache.org/licenses/LICENSE-2.0
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"""Set IAM Policy."""

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

from googlecloudsdk.calliope import base
from googlecloudsdk.command_lib.iap import util as iap_util


class SetIamPolicy(base.Command):
  """Set the IAM policy for an IAP IAM resource.

  This command replaces the existing IAM policy for an IAP IAM resource, given
  a file encoded in JSON or YAML that contains the IAM policy. If the given
  policy file specifies an "etag" value, then the replacement will succeed only
  if the policy already in place matches that etag. (An etag obtained via
  $ {parent_command} get-iam-policy will prevent the replacement if
  the policy for the resource has been subsequently updated.) A policy
  file that does not contain an etag value will replace any existing policy for
  the resource.
  """
  detailed_help = {
      'EXAMPLES':
          """\
          To set the IAM policy for the web accesses to the IAP protected
          resources within the active project,
          run:

            $ {command} POLICY_FILE

          To set the IAM policy for the web accesses to the IAP protected
          resources within a project, run:

            $ {command} POLICY_FILE --project=PROJECT_ID

          To set the IAM policy for the web accesses to the IAP protected
          resources within an App Engine application, run:

            $ {command} POLICY_FILE --resource-type=app-engine

          To set the IAM policy for the web accesses to the IAP protected
          resources within an App Engine service, run:

            $ {command} POLICY_FILE --resource-type=app-engine
                --service=SERVICE_ID

          To set the IAM policy for the web accesses to the IAP protected
          resources within an App Engine service version, run:

            $ {command} POLICY_FILE --resource-type=app-engine
                --service=SERVICE_ID --version=VERSION

          To set the IAM policy for the web accesses to the IAP protected
          resources within all backend services, run:

            $ {command} POLICY_FILE --resource-type=backend-services

          To set the IAM policy for the web accesses to the IAP protected
          resources within a backend service, run:

            $ {command} POLICY_FILE --resource-type=backend-services
                --service=SERVICE_ID
  """,
  }

  @staticmethod
  def Args(parser):
    """Register flags for this command.

    Args:
      parser: An argparse.ArgumentParser-like object. It is mocked out in order
          to capture some information, but behaves like an ArgumentParser.
    """
    iap_util.AddIapIamResourceArgs(parser)
    iap_util.AddIAMPolicyFileArg(parser)
    base.URI_FLAG.RemoveFromParser(parser)

  def Run(self, args):
    """This is what gets called when the user runs this command.

    Args:
      args: an argparse namespace. All the arguments that were provided to this
        command invocation.

    Returns:
      The specified function with its description and configured filter.
    """
    iap_iam_ref = iap_util.ParseIapIamResource(self.ReleaseTrack(), args)
    return iap_iam_ref.SetIamPolicy(args.policy_file)
