# -*- coding: utf-8 -*- #
# Copyright 2016 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,
# 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.

"""Util functions for DM commands."""

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

import base64
import binascii
import io

from googlecloudsdk.calliope import exceptions as calliope_exceptions
from googlecloudsdk.core import log
from googlecloudsdk.core.resource import resource_printer
from googlecloudsdk.core.util import http_encoding


def PrintFingerprint(fingerprint):
  """Prints the fingerprint for user reference."""

  log.status.Print('The fingerprint of the deployment is %s'
                   % (base64.urlsafe_b64encode(fingerprint)))


def DecodeFingerprint(fingerprint):
  """Returns the base64 url decoded fingerprint."""
  try:
    decoded_fingerprint = base64.urlsafe_b64decode(
        http_encoding.Encode(fingerprint))
  except (TypeError, binascii.Error):
    raise calliope_exceptions.InvalidArgumentException(
        '--fingerprint', 'fingerprint cannot be decoded.')
  return decoded_fingerprint


def CredentialFrom(message, principal):
  """Translates a dict of credential data into a message object.

  Args:
    message: The API message to use.
    principal: A string contains service account data.
  Returns:
    An ServiceAccount message object derived from credential_string.
  Raises:
    InvalidArgumentException: principal string unexpected format.
  """
  if principal == 'PROJECT_DEFAULT':
    return message.Credential(useProjectDefault=True)
  if principal.startswith('serviceAccount:'):
    service_account = message.ServiceAccount(
        email=principal[len('serviceAccount:'):])
    return message.Credential(serviceAccount=service_account)
  raise calliope_exceptions.InvalidArgumentException(
      '--credential',
      'credential must start with serviceAccount: or use PROJECT_DEFAULT.')


def RenderMessageAsYaml(message):
  """Returns a ready-to-print string representation for the provided message.

  Args:
    message: message object

  Returns:
    A ready-to-print string representation of the message.
  """
  output_message = io.StringIO()
  resource_printer.Print(message, 'yaml', out=output_message)
  return output_message.getvalue()


def LogOperationStatus(operation, operation_description):
  """Log operation warnings if there is any."""
  if operation.warnings:
    log.warning(
        '{0} operation {1} completed with warnings:\n{2}'.format(
            operation_description, operation.name,
            RenderMessageAsYaml(operation.warnings)))

  else:
    log.status.Print('{0} operation {1} completed successfully.'.format(
        operation_description, operation.name))
