# 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 diagnostic information on Kubernetes cluster."""

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


class Commands(enum.Enum):
  """Enum for kubernetes commands."""
  GET_CONFIGURED_CONTEXT = 1
  GET_PODS = 2
  GET_PVCS = 3
  GET_PVS = 4
  GET_SECRETS = 5
  GET_SERVICES = 6
  GET_KUBECTL_VERSION = 7
  GET_CONFIG_MAPS = 8


_command_string = {
    Commands.GET_CONFIGURED_CONTEXT: 'config view',
    Commands.GET_PODS: 'get pods',
    Commands.GET_PVCS: 'get pvc',
    Commands.GET_PVS: 'get pv',
    Commands.GET_SECRETS: 'get secrets',
    Commands.GET_SERVICES: 'get services',
    Commands.GET_KUBECTL_VERSION: 'version',
    Commands.GET_CONFIG_MAPS: 'get configmaps',
}


def execute_kubectl_command(
    kubectl_command_list: List[Text],
    human_readable: bool = False) -> utility.ExecutorResponse:
  """Invokes  the kubectl command.

  Args:
    kubectl_command_list: a command string list to be past to kubectl example
      format is ['config', 'view']
    human_readable: If false sets parameter -o 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 = ['kubectl']
  command_list.extend(kubectl_command_list)
  if not human_readable:
    command_list.extend(['-o', 'json'])

  return utility.ExecutorResponse().execute_command(command_list)


def get_kubectl_configuration(
    configuration: Commands,
    kubernetes_context: Text = None,
    namespace: Text = None,
    human_readable: bool = False) -> utility.ExecutorResponse:
  """Captures the specified environment configuration.

  Captures the environment state for the specified setting such as current
  context, active pods, etc and returns it in as a dictionary format. if no
  context is specified the system will use the current_context or error out of
  none is specified.

  Args:
    configuration:
      - K8_CONFIGURED_CONTEXT: returns all k8 configuration available in the
        current env including current_context.
      - PODS: returns all pods and their status details.
      - PVCS: returns all PersistentVolumeClaim and their status details.
      - SECRETS: returns all accessible k8 secrests.
      - PVS: returns all PersistentVolume and their status details.
      - SERVICES: returns all services and their status details.
    kubernetes_context: Context to use to retrieve cluster specific commands, if
      set to None calls will rely on current_context configured.
    namespace: default name space to be used for the commaand, if not specifeid
      --all-namespaces will be used.
    human_readable: If true all output will be in human readable form insted of
      Json.

  Returns:
    A list of dictionaries matching gcloud / gsutil output for the specified
    configuration,or an error message if any occurs during execution.
  """

  if configuration in (Commands.GET_CONFIGURED_CONTEXT,
                       Commands.GET_KUBECTL_VERSION):
    return execute_kubectl_command((_command_string[configuration]).split(' '),
                                   human_readable)

  execution_command = _command_string[configuration].split(' ')
  if kubernetes_context:
    execution_command.extend(['--context', kubernetes_context])
  if namespace:
    execution_command.extend(['--namespace', namespace])
  else:
    execution_command.extend(['--all-namespaces'])

  return execute_kubectl_command(execution_command, human_readable)


def _get_kfp_runtime() -> Text:
  """Captures the current version of kpf in k8 cluster.

  Returns:
    Returns the run-time version of kfp in as a string.
  """
  # TODO(chavoshi) needs to be implemented.
  raise NotImplementedError