# Copyright 2020 kubeflow.org
#
# 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.

from typing import Dict, Union
from kfp import dsl, components
from kfp_tekton.tekton import AddOnGroup
from kfp_tekton.compiler import TektonCompiler


class Coder:
    def empty(self):
        return ""


TektonCompiler._get_unique_id_code = Coder.empty

GCS_DOWNLOAD_STR = """
name: gcs-download
description: download file from GCS
inputs:
  - {name: url, type: String}
outputs:
  - {name: data, type: String}
implementation:
  container:
    image: google/cloud-sdk:279.0.0
    command:
    - sh
    - -c
    - gsutil cat $0 | tee $1
    - {inputValue: url}
    - {outputPath: data}
"""

gcs_download_op = components.load_component_from_text(GCS_DOWNLOAD_STR)

ECHO_STR = """
name: echo
description: print out message
inputs:
  - {name: text, type: String}
implementation:
  container:
    image: library/bash:4.4.23
    command:
    - sh
    - -c
    - echo "$0"
    - {inputValue: text}
"""

echo_op = components.load_component_from_text(ECHO_STR)


class Exception(AddOnGroup):
  """Exception Handler"""

  def __init__(self, params: Dict[str, Union[dsl.PipelineParam, str, int]] = {}):
    super().__init__(kind='Exception',
        api_version='custom.tekton.dev/v1alpha1',
        params=params,
        is_finally=True)


@dsl.pipeline(
    name='addon-sample',
    description='Addon sample for exception handing'
)
def addon_example(url: str = 'gs://ml-pipeline-playground/shakespeare1.txt'):
    """A sample pipeline showing exit handler."""

    echo_op('echo task!')

    with Exception():
        download_task = gcs_download_op(url)
        echo_op(download_task.outputs['data'])


if __name__ == '__main__':
    from kfp_tekton.compiler import TektonCompiler
    TektonCompiler().compile(addon_example,
                             __file__.replace('.py', '.yaml'))