#
# 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
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# 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
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"""Unit test for Bigquery verifier"""

# pytype: skip-file

from __future__ import absolute_import

import logging
import unittest

import mock
import pytest
from hamcrest import assert_that as hc_assert_that

from apache_beam.io.gcp import bigquery_tools
from apache_beam.io.gcp.tests import bigquery_matcher as bq_verifier
from apache_beam.testing.test_utils import patch_retry

# Protect against environments where bigquery library is not available.
# pylint: disable=wrong-import-order, wrong-import-position
try:
  from google.cloud import bigquery
  from google.cloud.exceptions import NotFound
except ImportError:
  bigquery = None
  NotFound = None
# pylint: enable=wrong-import-order, wrong-import-position


@unittest.skipIf(bigquery is None, 'Bigquery dependencies are not installed.')
@mock.patch.object(bigquery, 'Client')
class BigqueryMatcherTest(unittest.TestCase):
  def setUp(self):
    self._mock_result = mock.Mock()
    patch_retry(self, bq_verifier)

  def test_bigquery_matcher_success(self, mock_bigquery):
    mock_query_result = [mock.Mock(), mock.Mock(), mock.Mock()]
    mock_query_result[0].values.return_value = []
    mock_query_result[1].values.return_value = None
    mock_query_result[2].values.return_value = None

    mock_query = mock_bigquery.return_value.query
    mock_query.return_value.result.return_value = mock_query_result

    matcher = bq_verifier.BigqueryMatcher(
        'mock_project',
        'mock_query',
        '59f9d6bdee30d67ea73b8aded121c3a0280f9cd8')
    hc_assert_that(self._mock_result, matcher)
    self.assertEqual(1, mock_query.call_count)

  def test_bigquery_matcher_success_streaming_retry(self, mock_bigquery):
    # Simulate case where a streaming insert takes time to process, such that
    # the first query result is incomplete (empty).
    empty_query_result = []
    mock_query_result = [mock.Mock(), mock.Mock(), mock.Mock()]
    mock_query_result[0].values.return_value = []
    mock_query_result[1].values.return_value = None
    mock_query_result[2].values.return_value = None

    mock_query = mock_bigquery.return_value.query
    mock_query.return_value.result.side_effect = [
        empty_query_result, mock_query_result
    ]

    matcher = bq_verifier.BigqueryMatcher(
        'mock_project',
        'mock_query',
        '59f9d6bdee30d67ea73b8aded121c3a0280f9cd8',
        timeout_secs=5,
    )
    hc_assert_that(self._mock_result, matcher)
    self.assertEqual(2, mock_query.call_count)

  def test_bigquery_matcher_query_error_retry(self, mock_bigquery):
    mock_query = mock_bigquery.return_value.query
    mock_query.side_effect = NotFound('table not found')

    matcher = bq_verifier.BigqueryMatcher(
        'mock_project', 'mock_query', 'mock_checksum')
    with self.assertRaises(NotFound):
      hc_assert_that(self._mock_result, matcher)
    self.assertEqual(bq_verifier.MAX_RETRIES + 1, mock_query.call_count)

  def test_bigquery_matcher_query_error_checksum(self, mock_bigquery):
    empty_query_result = []

    mock_query = mock_bigquery.return_value.query
    mock_query.return_value.result.return_value = empty_query_result

    matcher = bq_verifier.BigqueryMatcher(
        'mock_project',
        'mock_query',
        '59f9d6bdee30d67ea73b8aded121c3a0280f9cd8',
    )
    with self.assertRaisesRegex(AssertionError, r'Expected checksum'):
      hc_assert_that(self._mock_result, matcher)
    self.assertEqual(1, mock_query.call_count)


@unittest.skipIf(bigquery is None, 'Bigquery dependencies are not installed.')
@mock.patch.object(bigquery_tools, 'BigQueryWrapper')
class BigqueryTableMatcherTest(unittest.TestCase):
  def setUp(self):
    self._mock_result = mock.Mock()
    patch_retry(self, bq_verifier)

  def test_bigquery_table_matcher_success(self, mock_bigquery):
    mock_query_result = mock.Mock(
        partitioning='a lot of partitioning', clustering={'column': 'FRIENDS'})

    mock_bigquery.return_value.get_table.return_value = mock_query_result

    matcher = bq_verifier.BigQueryTableMatcher(
        'mock_project',
        'mock_dataset',
        'mock_table',
        {
            'partitioning': 'a lot of partitioning',
            'clustering': {
                'column': 'FRIENDS'
            }
        })
    hc_assert_that(self._mock_result, matcher)

  def test_bigquery_table_matcher_query_error_retry(self, mock_bigquery):
    mock_query = mock_bigquery.return_value.get_table
    mock_query.side_effect = ValueError('table not found')

    matcher = bq_verifier.BigQueryTableMatcher(
        'mock_project',
        'mock_dataset',
        'mock_table',
        {
            'partitioning': 'a lot of partitioning',
            'clustering': {
                'column': 'FRIENDS'
            }
        })

    with self.assertRaises(ValueError):
      hc_assert_that(self._mock_result, matcher)
    self.assertEqual(bq_verifier.MAX_RETRIES + 1, mock_query.call_count)


@pytest.mark.no_xdist  # xdist somehow makes the test do real requests.
@unittest.skipIf(bigquery is None, 'Bigquery dependencies are not installed.')
@mock.patch.object(
    bq_verifier.BigqueryFullResultStreamingMatcher, '_query_with_retry')
class BigqueryFullResultStreamingMatcher(unittest.TestCase):
  def setUp(self):
    self.timeout = 0.01

  def test__get_query_result_timeout(self, mock__query_with_retry):
    mock__query_with_retry.side_effect = lambda: []
    matcher = bq_verifier.BigqueryFullResultStreamingMatcher(
        'some-project', 'some-query', [1, 2, 3], timeout=self.timeout)
    with self.assertRaises(TimeoutError):  # noqa: F821
      matcher._get_query_result()


if __name__ == '__main__':
  logging.getLogger().setLevel(logging.INFO)
  unittest.main()
