import time
import pytest
import os

from helpers.cluster import ClickHouseCluster


cluster = ClickHouseCluster(__file__)
node = cluster.add_instance('node', config_dir="configs")

SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
CONFIG_PATH = os.path.join(SCRIPT_DIR, './_instances/node/configs/config.xml')


@pytest.fixture(scope="module")
def start_cluster():
    try:
        cluster.start()
        node.query("CREATE TABLE test(date Date, id UInt32) ENGINE = MergeTree() PARTITION BY date ORDER BY id")
        yield cluster
    finally:
        cluster.shutdown()


def test_reload_max_table_size_to_drop(start_cluster):
    node.query("INSERT INTO test VALUES (now(), 0)")

    time.sleep(5)  # wait for data part commit

    drop = node.get_query_request("DROP TABLE test")
    out, err = drop.get_answer_and_error()
    assert out == ""
    assert err != ""

    config = open(CONFIG_PATH, 'r')
    config_lines = config.readlines()
    config.close()
    config_lines = map(lambda line: line.replace("<max_table_size_to_drop>1", "<max_table_size_to_drop>1000000"),
                       config_lines)
    config = open(CONFIG_PATH, 'w')
    config.writelines(config_lines)
    config.close()

    node.query("SYSTEM RELOAD CONFIG")

    drop = node.get_query_request("DROP TABLE test")
    out, err = drop.get_answer_and_error()
    assert out == ""
    assert err == ""