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from __future__ import absolute_import, division, print_function
import datetime

from tests.common.impala_test_suite import ImpalaTestSuite
from tests.util.iceberg_util import parse_timestamp, get_snapshots


class IcebergTestSuite(ImpalaTestSuite):

  @classmethod
  def execute_query_ts(cls, impalad_client, query):
    """Executes the given query then returns the time when it finished."""
    impalad_client.execute(query)
    return datetime.datetime.now()

  @classmethod
  def expect_num_snapshots_from(cls, impalad_client, tbl_name, ts, expected_result_size):
    """Executes DESCRIBE HISTORY <tbl> FROM through the given client. Verifies if the
       result snapshots are newer than the provided timestamp and checks the expected
       number of results."""
    snapshots = get_snapshots(impalad_client, tbl_name, ts_start=ts,
        expected_result_size=expected_result_size)
    for snapshot in snapshots:
      assert snapshot.get_creation_time() >= ts

  def expect_results_between(cls, impalad_client, tbl_name, ts_start, ts_end,
      expected_result_size):
    snapshots = get_snapshots(impalad_client, tbl_name, ts_start=ts_start,
        ts_end=ts_end, expected_result_size=expected_result_size)
    for snapshot in snapshots:
      assert snapshot.get_creation_time() >= ts_start
      assert snapshot.get_creation_time() <= ts_end

  @classmethod
  def impala_now(cls, impalad_client):
    now_data = impalad_client.execute("select now()")
    now_data_ts_dt = parse_timestamp(now_data.data[0])
    return now_data_ts_dt