# Copyright 2018 The Kubeflow Authors
#
# 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.
"""Toy example demonstrating how to specify imagepullsecrets to access protected
container registry.
"""

import kfp.deprecated.dsl as dsl
from kfp.deprecated import compiler
from kubernetes import client as k8s_client


class GetFrequentWordOp(dsl.ContainerOp):
  """A get frequent word class representing a component in ML Pipelines.

  The class provides a nice interface to users by hiding details such as container,
  command, arguments.
  """
  def __init__(self, name, message):
    """Args:
         name: An identifier of the step which needs to be unique within a pipeline.
         message: a dsl.PipelineParam object representing an input message.
    """
    super(GetFrequentWordOp, self).__init__(
        name=name,
        image='python:3.5-jessie',
        command=['sh', '-c'],
        arguments=['python -c "from collections import Counter; '
                   'words = Counter(\'%s\'.split()); print(max(words, key=words.get))" '
                   '| tee /tmp/message.txt' % message],
        file_outputs={'word': '/tmp/message.txt'})

@dsl.pipeline(
  name='save-most-frequent',
  description='Get Most Frequent Word and Save to GCS'
)
def save_most_frequent_word(message: str):
  """A pipeline function describing the orchestration of the workflow."""

  counter = GetFrequentWordOp(
          name='get-Frequent',
          message=message)
  # Call set_image_pull_secrets after get_pipeline_conf().
  dsl.get_pipeline_conf()\
    .set_image_pull_secrets([k8s_client.V1ObjectReference(name="secretA")])

if __name__ == '__main__':
  compiler.Compiler().compile(save_most_frequent_word, __file__ + '.yaml')
