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import pytest
from copy import deepcopy

from tests.common.environ import ImpalaTestClusterProperties
from tests.common.impala_test_suite import ImpalaTestSuite
from tests.common.skip import SkipIfNotHdfsMinicluster
from tests.common.test_dimensions import (create_exec_option_dimension_from_dict,
    create_parquet_dimension)

IMPALA_TEST_CLUSTER_PROPERTIES = ImpalaTestClusterProperties.get_instance()

# Test with denial of reservations at varying frequency.
# Always test with the minimal amount of spilling and running with the absolute minimum
# memory requirement.
CORE_DEBUG_ACTION_DIMS = [None,
  '-1:OPEN:SET_DENY_RESERVATION_PROBABILITY@1.0']

# Test with different frequency of denial on exhaustive to try and exercise more
# interesting code paths.
EXHAUSTIVE_DEBUG_ACTION_DIMS = [
  '-1:OPEN:SET_DENY_RESERVATION_PROBABILITY@0.1',
  '-1:OPEN:SET_DENY_RESERVATION_PROBABILITY@0.5',
  '-1:OPEN:SET_DENY_RESERVATION_PROBABILITY@0.9']


@pytest.mark.xfail(IMPALA_TEST_CLUSTER_PROPERTIES.is_remote_cluster(),
                   reason='Queries may not spill on larger clusters')
class TestSpillingDebugActionDimensions(ImpalaTestSuite):
  @classmethod
  def get_workload(self):
    return 'functional-query'

  @classmethod
  def add_test_dimensions(cls):
    super(TestSpillingDebugActionDimensions, cls).add_test_dimensions()
    cls.ImpalaTestMatrix.clear_constraints()
    cls.ImpalaTestMatrix.add_dimension(create_parquet_dimension('tpch'))
    debug_action_dims = CORE_DEBUG_ACTION_DIMS
    if cls.exploration_strategy() == 'exhaustive':
      debug_action_dims = CORE_DEBUG_ACTION_DIMS + EXHAUSTIVE_DEBUG_ACTION_DIMS
    # Tests are calibrated so that they can execute and spill with this page size.
    cls.ImpalaTestMatrix.add_dimension(
        create_exec_option_dimension_from_dict({'default_spillable_buffer_size' : ['256k'],
          'debug_action' : debug_action_dims}))

  def test_spilling(self, vector):
    self.run_test_case('QueryTest/spilling', vector)

  def test_spilling_aggs(self, vector):
    self.run_test_case('QueryTest/spilling-aggs', vector)

  def test_spilling_large_rows(self, vector, unique_database):
    """Test that we can process large rows in spilling operators, with or without
       spilling to disk"""
    self.run_test_case('QueryTest/spilling-large-rows', vector, unique_database)

  def test_spilling_naaj(self, vector):
    """Test spilling null-aware anti-joins"""
    self.run_test_case('QueryTest/spilling-naaj', vector)

  @SkipIfNotHdfsMinicluster.tuned_for_minicluster
  def test_spilling_regression_exhaustive(self, vector):
    """Regression tests for spilling. mem_limits tuned for 3-node minicluster."""
    if self.exploration_strategy() != 'exhaustive':
      pytest.skip("only run large sorts on exhaustive")
    self.run_test_case('QueryTest/spilling-regression-exhaustive', vector)
    new_vector = deepcopy(vector)
    del new_vector.get_value('exec_option')['default_spillable_buffer_size']
    self.run_test_case(
        'QueryTest/spilling-regression-exhaustive-no-default-buffer-size', new_vector)


@pytest.mark.xfail(IMPALA_TEST_CLUSTER_PROPERTIES.is_remote_cluster(),
                   reason='Queries may not spill on larger clusters')
class TestSpillingNoDebugActionDimensions(ImpalaTestSuite):
  """Spilling tests to which we don't want to apply the debug_action dimension."""
  @classmethod
  def get_workload(self):
    return 'functional-query'

  @classmethod
  def add_test_dimensions(cls):
    super(TestSpillingNoDebugActionDimensions, cls).add_test_dimensions()
    cls.ImpalaTestMatrix.clear_constraints()
    cls.ImpalaTestMatrix.add_dimension(create_parquet_dimension('tpch'))
    # Tests are calibrated so that they can execute and spill with this page size.
    cls.ImpalaTestMatrix.add_dimension(
        create_exec_option_dimension_from_dict({'default_spillable_buffer_size' : ['256k']}))

  def test_spilling_naaj_no_deny_reservation(self, vector):
    """
    Null-aware anti-join tests that depend on getting more than the minimum reservation
    and therefore will not reliably pass with the deny reservation debug action enabled.
    """
    self.run_test_case('QueryTest/spilling-naaj-no-deny-reservation', vector)

  def test_spilling_query_options(self, vector):
    """Test that spilling-related query options work end-to-end. These tests rely on
      setting debug_action to alternative values via query options."""
    self.run_test_case('QueryTest/spilling-query-options', vector)

  def test_spilling_no_debug_action(self, vector):
    """Spilling tests that will not succeed if run with an arbitrary debug action.
       These tests either run with no debug action set or set their own debug action."""
    self.run_test_case('QueryTest/spilling-no-debug-action', vector)