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# Tests for column lineage.
# TODO: add verification for more fields.

import json
import logging
import os
import pytest
import shutil
import stat
import tempfile
import time

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite

LOG = logging.getLogger(__name__)

class TestLineage(CustomClusterTestSuite):

  lineage_log_dir = tempfile.mkdtemp();

  query = """
      select count(*) from functional.alltypes
      """

  @classmethod
  def setup_class(cls):
    super(TestLineage, cls).setup_class()

  @classmethod
  def teardown_class(cls):
    shutil.rmtree(cls.lineage_log_dir);

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args("--lineage_event_log_dir=%s" % lineage_log_dir)
  def test_start_end_timestamp(self, vector):
    """Test that 'timestamp' and 'endTime' in the lineage graph are populated with valid
       UNIX times."""
    LOG.info("lineage_event_log_dir is " + self.lineage_log_dir)
    before_time = int(time.time())
    self.execute_query_expect_success(self.client, self.query)
    after_time = int(time.time())
    LOG.info("before_time " + str(before_time) + " after_time " + str(after_time))

    # Stop the cluster in order to flush the lineage log files.
    self._stop_impala_cluster()

    for log_filename in os.listdir(self.lineage_log_dir):
      log_path = os.path.join(self.lineage_log_dir, log_filename)
      # Only the coordinator's log file will be populated.
      if os.path.getsize(log_path) > 0:
        LOG.info("examining file: " + log_path)
        with open(log_path) as log_file:
          lineage_json = json.load(log_file)
          timestamp = int(lineage_json["timestamp"])
          end_time = int(lineage_json["endTime"])
          assert before_time <= timestamp
          assert timestamp <= end_time
          assert end_time <= after_time
      else:
        LOG.info("empty file: " + log_path)