# Lint as: python3
# 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.
"""Functions for collecting GCP related environment configurations."""

import enum
from typing import List, Text, Optional
from . import utility


class Commands(enum.Enum):
  """Enum for gcloud and gsutil commands."""
  GET_APIS = 1
  GET_CONTAINER_CLUSTERS = 2
  GET_CONTAINER_IMAGES = 3
  GET_DISKS = 4
  GET_GCLOUD_DEFAULT = 5
  GET_NETWORKS = 6
  GET_QUOTAS = 7
  GET_SCOPES = 8
  GET_SERVICE_ACCOUNTS = 9
  GET_STORAGE_BUCKETS = 10
  GET_GCLOUD_VERSION = 11
  GET_AUTH_LIST = 12


_command_string = {
    Commands.GET_APIS: 'services list',
    Commands.GET_CONTAINER_CLUSTERS: 'container clusters list',
    Commands.GET_CONTAINER_IMAGES: 'container images list',
    Commands.GET_DISKS: 'compute disks list',
    Commands.GET_GCLOUD_DEFAULT: 'config list --all',
    Commands.GET_NETWORKS: 'compute networks list',
    Commands.GET_QUOTAS: 'compute regions list',
    Commands.GET_SCOPES: 'compute instances list',
    Commands.GET_SERVICE_ACCOUNTS: 'iam service-accounts list',
    Commands.GET_STORAGE_BUCKETS: 'ls',
    Commands.GET_GCLOUD_VERSION: 'version',
    Commands.GET_AUTH_LIST: 'auth list',
}


def execute_gcloud_command(
    gcloud_command_list: List[Text],
    project_id: Optional[Text] = None,
    human_readable: Optional[bool] = False) -> utility.ExecutorResponse:
  """Function for invoking gcloud command.

  Args:
    gcloud_command_list: a command string list to be past to gcloud example
      format is ['config', 'list', '--all']
    project_id: specificies the project to run the commands against if not
      provided provided will use gcloud default project if one is configured
      otherwise will return an error message.
    human_readable: If false sets parameter --format json for all calls,
      otherwie output will be in human readable format.

  Returns:
    utility.ExecutorResponse with outputs from stdout,stderr and execution code.
  """
  command_list = ['gcloud']
  command_list.extend(gcloud_command_list)
  if not human_readable:
    command_list.extend(['--format', 'json'])

  if project_id is not None:
    command_list.extend(['--project', project_id])

  return utility.ExecutorResponse().execute_command(command_list)


def execute_gsutil_command(
    gsutil_command_list: List[Text],
    project_id: Optional[Text] = None) -> utility.ExecutorResponse:
  """Function for invoking gsutil command.

  This function takes in a gsutil parameter list and returns the results as a
  list of dictionaries.
  Args:
    gsutil_command_list: a command string list to be past to gsutil example
      format is ['config', 'list', '--all']
    project_id: specific project to check the QUOTASs for,if no project id is
      provided will use gcloud default project if one is configured otherwise
      will return an erro massage.

  Returns:
    utility.ExecutorResponse with outputs from stdout,stderr and execution code.
  """
  command_list = ['gsutil']
  command_list.extend(gsutil_command_list)

  if project_id is not None:
    command_list.extend(['-p', project_id])

  return utility.ExecutorResponse().execute_command(command_list)


def get_gcp_configuration(
    configuration: Commands,
    project_id: Optional[Text] = None,
    human_readable: Optional[bool] = False) -> utility.ExecutorResponse:
  """Captures the specified environment configuration.

  Captures the environment configuration for the specified setting such as
  NETWORKSing configuration, project QUOTASs, etc.

  Args:
    configuration: Commands for specific information to be retrieved
      - APIS:  Captures a complete list of enabled APISs and their configuration
        details under the specified project.
      - CONTAINER_CLUSTERS: List all visible k8 clusters under the project.
      - CONTAINER_IMAGES: List of all container images under the project
        container repo.
      - DISKS: List of storage allocated by the project including notebook
        instances as well as k8 pds with corresponding state.
      - GCLOUD_DEFAULT:  Environment default configuration for gcloud
      - NETWORKS: List all NETWORKSs and their configuration under the project.
      - QUOTAS:  Captures a complete list of  QUOTASs for project per
        region,returns the results as a list of dictionaries.
      - SCOPES: list of SCOPESs for each compute resources in the project.
      - SERVICE_ACCOUNTS: List of all service accounts that are enabled under
        this project.
      - STORAGE_BUCKETS: list of buckets and corresponding access information.
    project_id: specific project to check the QUOTASs for,if no project id is
      provided will use gcloud default project if one is configured otherwise
      will return an error message.
    human_readable: If true all output will be in human readable form insted of
      Json.

  Returns:
    A utility.ExecutorResponse with the output results for the specified
    command.
  """
  # storage bucket call requires execute_gsutil_command
  if configuration is Commands.GET_STORAGE_BUCKETS:
    return execute_gsutil_command([_command_string[Commands.GET_STORAGE_BUCKETS]],
                                  project_id)

  # For all other cases can execute the command directly
  return execute_gcloud_command(_command_string[configuration].split(' '),
                                project_id, human_readable)