import pytest
import re

from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)
node = cluster.add_instance(
    "node", with_zookeeper=False, main_configs=["configs/log.xml"]
)

config = """<clickhouse>
    <logger>
        <level>debug</level>
        <log>/var/log/clickhouse-server/clickhouse-server.log</log>
    </logger>
</clickhouse>"""


@pytest.fixture(scope="module")
def start_cluster():
    try:
        cluster.start()
        yield cluster

    finally:
        cluster.shutdown()


def get_log(node):
    return node.exec_in_container(
        ["bash", "-c", "cat /var/log/clickhouse-server/clickhouse-server.log"]
    )


def check_it_will_work_slowly(node, log):
    it_will_work_slowly = "It will work slowly"
    if node.is_built_with_sanitizer() or node.is_debug_build():
        # message still in logs
        re.search(f"<Warning>.*{it_will_work_slowly}", log)
    # but not in system.warnings
    query = f"SELECT count() FROM system.warnings WHERE message ILIKE '%{it_will_work_slowly}%'"
    assert 0 == int(node.query(query).strip())


def test_log_levels_update(start_cluster):
    # Make sure that there are enough log messages for the test
    for _ in range(5):
        node.query("SELECT 1")

    log = get_log(node)
    assert re.search("(<Trace>|<Debug>)", log)

    check_it_will_work_slowly(node, log)

    node.replace_config("/etc/clickhouse-server/config.d/log.xml", config)
    node.query("SYSTEM RELOAD CONFIG;")
    node.exec_in_container(
        ["bash", "-c", "> /var/log/clickhouse-server/clickhouse-server.log"]
    )

    for _ in range(5):
        node.query("SELECT 1")

    log = get_log(node)
    assert len(log) > 0
    assert not re.search("<Trace>", log)