#
# 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.
#

# pytype: skip-file

from __future__ import absolute_import

import unittest

from apache_beam import coders
from apache_beam.options.pipeline_options import StandardOptions
from apache_beam.portability.api.beam_interactive_api_pb2 import TestStreamFileHeader
from apache_beam.portability.api.beam_interactive_api_pb2 import TestStreamFileRecord
from apache_beam.portability.api.beam_runner_api_pb2 import TestStreamPayload
from apache_beam.runners.interactive.cache_manager import SafeFastPrimitivesCoder
from apache_beam.runners.interactive.caching.cacheable import CacheKey
from apache_beam.runners.interactive.caching.streaming_cache import StreamingCache
from apache_beam.runners.interactive.testing.test_cache_manager import FileRecordsBuilder
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.test_stream import TestStream
from apache_beam.testing.util import *
from apache_beam.transforms.window import TimestampedValue

# Nose automatically detects tests if they match a regex. Here, it mistakens
# these protos as tests. For more info see the Nose docs at:
# https://nose.readthedocs.io/en/latest/writing_tests.html
TestStreamPayload.__test__ = False  # type: ignore[attr-defined]
TestStreamFileHeader.__test__ = False  # type: ignore[attr-defined]
TestStreamFileRecord.__test__ = False  # type: ignore[attr-defined]


class StreamingCacheTest(unittest.TestCase):
  def setUp(self):
    pass

  def test_exists(self):
    cache = StreamingCache(cache_dir=None)
    self.assertFalse(cache.exists('my_label'))
    cache.write([TestStreamFileRecord()], 'my_label')
    self.assertTrue(cache.exists('my_label'))

  def test_empty(self):
    CACHED_PCOLLECTION_KEY = repr(CacheKey('arbitrary_key', '', '', ''))

    cache = StreamingCache(cache_dir=None)
    self.assertFalse(cache.exists(CACHED_PCOLLECTION_KEY))
    cache.write([], CACHED_PCOLLECTION_KEY)
    reader, _ = cache.read(CACHED_PCOLLECTION_KEY)

    # Assert that an empty reader returns an empty list.
    self.assertFalse([e for e in reader])

  def test_size(self):
    cache = StreamingCache(cache_dir=None)
    cache.write([TestStreamFileRecord()], 'my_label')
    coder = cache.load_pcoder('my_label')

    # Add one because of the new-line character that is also written.
    size = len(coder.encode(TestStreamFileRecord().SerializeToString())) + 1
    self.assertEqual(cache.size('my_label'), size)

  def test_clear(self):
    cache = StreamingCache(cache_dir=None)
    self.assertFalse(cache.exists('my_label'))
    cache.sink(['my_label'], is_capture=True)
    cache.write([TestStreamFileRecord()], 'my_label')
    self.assertTrue(cache.exists('my_label'))
    self.assertEqual(cache.capture_keys, set(['my_label']))
    self.assertTrue(cache.clear('my_label'))
    self.assertFalse(cache.exists('my_label'))
    self.assertFalse(cache.capture_keys)

  def test_single_reader(self):
    """Tests that we expect to see all the correctly emitted TestStreamPayloads.
    """
    CACHED_PCOLLECTION_KEY = repr(CacheKey('arbitrary_key', '', '', ''))

    values = (FileRecordsBuilder(tag=CACHED_PCOLLECTION_KEY)
              .add_element(element=0, event_time_secs=0)
              .advance_processing_time(1)
              .add_element(element=1, event_time_secs=1)
              .advance_processing_time(1)
              .add_element(element=2, event_time_secs=2)
              .build()) # yapf: disable

    cache = StreamingCache(cache_dir=None)
    cache.write(values, CACHED_PCOLLECTION_KEY)

    reader, _ = cache.read(CACHED_PCOLLECTION_KEY)
    coder = coders.FastPrimitivesCoder()
    events = list(reader)

    # Units here are in microseconds.
    expected = [
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(0), timestamp=0)
                ],
                tag=CACHED_PCOLLECTION_KEY)),
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(1), timestamp=1 * 10**6)
                ],
                tag=CACHED_PCOLLECTION_KEY)),
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(2), timestamp=2 * 10**6)
                ],
                tag=CACHED_PCOLLECTION_KEY)),
    ]
    self.assertSequenceEqual(events, expected)

  def test_multiple_readers(self):
    """Tests that the service advances the clock with multiple outputs.
    """

    CACHED_LETTERS = repr(CacheKey('letters', '', '', ''))
    CACHED_NUMBERS = repr(CacheKey('numbers', '', '', ''))
    CACHED_LATE = repr(CacheKey('late', '', '', ''))

    letters = (FileRecordsBuilder(CACHED_LETTERS)
               .advance_processing_time(1)
               .advance_watermark(watermark_secs=0)
               .add_element(element='a', event_time_secs=0)
               .advance_processing_time(10)
               .advance_watermark(watermark_secs=10)
               .add_element(element='b', event_time_secs=10)
               .build()) # yapf: disable

    numbers = (FileRecordsBuilder(CACHED_NUMBERS)
               .advance_processing_time(2)
               .add_element(element=1, event_time_secs=0)
               .advance_processing_time(1)
               .add_element(element=2, event_time_secs=0)
               .advance_processing_time(1)
               .add_element(element=2, event_time_secs=0)
               .build()) # yapf: disable

    late = (FileRecordsBuilder(CACHED_LATE)
            .advance_processing_time(101)
            .add_element(element='late', event_time_secs=0)
            .build()) # yapf: disable

    cache = StreamingCache(cache_dir=None)
    cache.write(letters, CACHED_LETTERS)
    cache.write(numbers, CACHED_NUMBERS)
    cache.write(late, CACHED_LATE)

    reader = cache.read_multiple([[CACHED_LETTERS], [CACHED_NUMBERS],
                                  [CACHED_LATE]])
    coder = coders.FastPrimitivesCoder()
    events = list(reader)

    # Units here are in microseconds.
    expected = [
        # Advances clock from 0 to 1
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=0, tag=CACHED_LETTERS)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('a'), timestamp=0)
                ],
                tag=CACHED_LETTERS)),

        # Advances clock from 1 to 2
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(1), timestamp=0)
                ],
                tag=CACHED_NUMBERS)),

        # Advances clock from 2 to 3
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(2), timestamp=0)
                ],
                tag=CACHED_NUMBERS)),

        # Advances clock from 3 to 4
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode(2), timestamp=0)
                ],
                tag=CACHED_NUMBERS)),

        # Advances clock from 4 to 11
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=7 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=10 * 10**6, tag=CACHED_LETTERS)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('b'), timestamp=10 * 10**6)
                ],
                tag=CACHED_LETTERS)),

        # Advances clock from 11 to 101
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=90 * 10**6)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('late'), timestamp=0)
                ],
                tag=CACHED_LATE)),
    ]

    self.assertSequenceEqual(events, expected)

  def test_read_and_write(self):
    """An integration test between the Sink and Source.

    This ensures that the sink and source speak the same language in terms of
    coders, protos, order, and units.
    """
    CACHED_RECORDS = repr(CacheKey('records', '', '', ''))

    # Units here are in seconds.
    test_stream = (
        TestStream(output_tags=(CACHED_RECORDS))
                   .advance_watermark_to(0, tag=CACHED_RECORDS)
                   .advance_processing_time(5)
                   .add_elements(['a', 'b', 'c'], tag=CACHED_RECORDS)
                   .advance_watermark_to(10, tag=CACHED_RECORDS)
                   .advance_processing_time(1)
                   .add_elements(
                       [
                           TimestampedValue('1', 15),
                           TimestampedValue('2', 15),
                           TimestampedValue('3', 15)
                       ],
                       tag=CACHED_RECORDS)) # yapf: disable

    coder = SafeFastPrimitivesCoder()
    cache = StreamingCache(cache_dir=None, sample_resolution_sec=1.0)

    # Assert that there are no capture keys at first.
    self.assertEqual(cache.capture_keys, set())

    options = StandardOptions(streaming=True)
    with TestPipeline(options=options) as p:
      records = (p | test_stream)[CACHED_RECORDS]

      # pylint: disable=expression-not-assigned
      records | cache.sink([CACHED_RECORDS], is_capture=True)

    reader, _ = cache.read(CACHED_RECORDS)
    actual_events = list(reader)

    # Assert that the capture keys are forwarded correctly.
    self.assertEqual(cache.capture_keys, set([CACHED_RECORDS]))

    # Units here are in microseconds.
    expected_events = [
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=5 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=0, tag=CACHED_RECORDS)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('a'), timestamp=0),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('b'), timestamp=0),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('c'), timestamp=0),
                ],
                tag=CACHED_RECORDS)),
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=10 * 10**6, tag=CACHED_RECORDS)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('1'), timestamp=15 *
                        10**6),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('2'), timestamp=15 *
                        10**6),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('3'), timestamp=15 *
                        10**6),
                ],
                tag=CACHED_RECORDS)),
    ]
    self.assertEqual(actual_events, expected_events)

  def test_read_and_write_multiple_outputs(self):
    """An integration test between the Sink and Source with multiple outputs.

    This tests the funcionatlity that the StreamingCache reads from multiple
    files and combines them into a single sorted output.
    """
    LETTERS_TAG = repr(CacheKey('letters', '', '', ''))
    NUMBERS_TAG = repr(CacheKey('numbers', '', '', ''))

    # Units here are in seconds.
    test_stream = (TestStream()
                   .advance_watermark_to(0, tag=LETTERS_TAG)
                   .advance_processing_time(5)
                   .add_elements(['a', 'b', 'c'], tag=LETTERS_TAG)
                   .advance_watermark_to(10, tag=NUMBERS_TAG)
                   .advance_processing_time(1)
                   .add_elements(
                       [
                           TimestampedValue('1', 15),
                           TimestampedValue('2', 15),
                           TimestampedValue('3', 15)
                       ],
                       tag=NUMBERS_TAG)) # yapf: disable

    cache = StreamingCache(cache_dir=None, sample_resolution_sec=1.0)

    coder = SafeFastPrimitivesCoder()

    options = StandardOptions(streaming=True)
    with TestPipeline(options=options) as p:
      # pylint: disable=expression-not-assigned
      events = p | test_stream
      events[LETTERS_TAG] | 'Letters sink' >> cache.sink([LETTERS_TAG])
      events[NUMBERS_TAG] | 'Numbers sink' >> cache.sink([NUMBERS_TAG])

    reader = cache.read_multiple([[LETTERS_TAG], [NUMBERS_TAG]])
    actual_events = list(reader)

    # Units here are in microseconds.
    expected_events = [
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=5 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=0, tag=LETTERS_TAG)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('a'), timestamp=0),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('b'), timestamp=0),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('c'), timestamp=0),
                ],
                tag=LETTERS_TAG)),
        TestStreamPayload.Event(
            processing_time_event=TestStreamPayload.Event.AdvanceProcessingTime(
                advance_duration=1 * 10**6)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=10 * 10**6, tag=NUMBERS_TAG)),
        TestStreamPayload.Event(
            watermark_event=TestStreamPayload.Event.AdvanceWatermark(
                new_watermark=0, tag=LETTERS_TAG)),
        TestStreamPayload.Event(
            element_event=TestStreamPayload.Event.AddElements(
                elements=[
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('1'), timestamp=15 *
                        10**6),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('2'), timestamp=15 *
                        10**6),
                    TestStreamPayload.TimestampedElement(
                        encoded_element=coder.encode('3'), timestamp=15 *
                        10**6),
                ],
                tag=NUMBERS_TAG)),
    ]

    self.assertListEqual(actual_events, expected_events)


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