# coding=utf-8
#
# Licensed to the Apache Software Foundation (ASF) under one or more
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# The ASF licenses this file to You 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
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#    http://www.apache.org/licenses/LICENSE-2.0
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# pytype: skip-file
# pylint:disable=line-too-long

# beam-playground:
#   name: CombineValuesSideInputsSingleton
#   description: Demonstration of CombineValue transform usage with side inputs from a singleton.
#   multifile: false
#   default_example: false
#   context_line: 39
#   categories:
#     - Core Transforms
#   complexity: BASIC
#   tags:
#     - transforms
#     - pairs
#     - combine


def combinevalues_side_inputs_singleton(test=None):
  # [START combinevalues_side_inputs_singleton]
  import apache_beam as beam

  with beam.Pipeline() as pipeline:
    max_value = pipeline | 'Create max_value' >> beam.Create([8])

    saturated_total = (
        pipeline
        | 'Create plant counts' >> beam.Create([
            ('🥕', [3, 2]),
            ('🍆', [1]),
            ('🍅', [4, 5, 3]),
        ])
        | 'Saturated sum' >> beam.CombineValues(
            lambda values,
            max_value: min(sum(values), max_value),
            max_value=beam.pvalue.AsSingleton(max_value))
        | beam.Map(print))
    # [END combinevalues_side_inputs_singleton]
    if test:
      test(saturated_total)


if __name__ == '__main__':
  combinevalues_side_inputs_singleton()
