#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# 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
#
#    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.
#

"""Test for the autocomplete example."""

from __future__ import absolute_import

import unittest

from nose.plugins.attrib import attr

import apache_beam as beam
from apache_beam.examples.complete import autocomplete
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.test_utils import compute_hash
from apache_beam.testing.util import assert_that
from apache_beam.testing.util import equal_to


class AutocompleteTest(unittest.TestCase):

  WORDS = ['this', 'this', 'that', 'to', 'to', 'to']
  KINGLEAR_HASH_SUM = 268011785062540
  KINGLEAR_INPUT = 'gs://dataflow-samples/shakespeare/kinglear.txt'

  def test_top_prefixes(self):
    with TestPipeline() as p:
      words = p | beam.Create(self.WORDS)
      result = words | autocomplete.TopPerPrefix(5)
      # values must be hashable for now
      result = result | beam.Map(lambda k_vs: (k_vs[0], tuple(k_vs[1])))
      assert_that(result, equal_to(
          [
              ('t', ((3, 'to'), (2, 'this'), (1, 'that'))),
              ('to', ((3, 'to'), )),
              ('th', ((2, 'this'), (1, 'that'))),
              ('thi', ((2, 'this'), )),
              ('this', ((2, 'this'), )),
              ('tha', ((1, 'that'), )),
              ('that', ((1, 'that'), )),
          ]))

  @attr('IT')
  def test_autocomplete_it(self):
    with TestPipeline(is_integration_test=True) as p:
      words = p | beam.io.ReadFromText(self.KINGLEAR_INPUT)
      result = words | autocomplete.TopPerPrefix(10)
      # values must be hashable for now
      result = result | beam.Map(lambda k_vs: [k_vs[0],
                                               k_vs[1][0][0], k_vs[1][0][1]])
      checksum = (result
                  | beam.Map(lambda x: int(compute_hash(x)[:8], 16))
                  | beam.CombineGlobally(sum))

      assert_that(checksum, equal_to([self.KINGLEAR_HASH_SUM]))


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