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"""Unit tests for the transform.external classes."""

from __future__ import absolute_import

import dataclasses
import typing
import unittest

import apache_beam as beam
from apache_beam import typehints
from apache_beam.portability.api.external_transforms_pb2 import ExternalConfigurationPayload
from apache_beam.transforms.external_test import PayloadBase


def get_payload(cls):
  payload = ExternalConfigurationPayload()
  payload.ParseFromString(cls._payload)
  return payload


class ExternalDataclassesPayloadTest(PayloadBase, unittest.TestCase):

  def get_payload_from_typing_hints(self, values):

    @dataclasses.dataclass
    class DataclassTransform(beam.ExternalTransform):
      URN = 'beam:external:fakeurn:v1'

      integer_example: int
      string_example: str
      list_of_strings: typing.List[str]
      optional_kv: typing.Optional[typing.Tuple[str, float]] = None
      optional_integer: typing.Optional[int] = None
      expansion_service: dataclasses.InitVar[typing.Optional[str]] = None

    return get_payload(DataclassTransform(**values))

  def get_payload_from_beam_typehints(self, values):

    @dataclasses.dataclass
    class DataclassTransform(beam.ExternalTransform):
      URN = 'beam:external:fakeurn:v1'

      integer_example: int
      string_example: str
      list_of_strings: typehints.List[str]
      optional_kv: typehints.Optional[typehints.KV[str, float]] = None
      optional_integer: typehints.Optional[int] = None
      expansion_service: dataclasses.InitVar[typehints.Optional[str]] = None

    return get_payload(DataclassTransform(**values))

if __name__ == '__main__':
  unittest.main()