import os
import sys
import time
import logging
import pytest

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))

from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)
node = cluster.add_instance('node', stay_alive=True, main_configs=['config/dictionaries_config.xml'])


def copy_file_to_container(local_path, dist_path, container_id):
    os.system("docker cp {local} {cont_id}:{dist}".format(local=local_path, cont_id=container_id, dist=dist_path))


config = '''<yandex>
    <dictionaries_config>/etc/clickhouse-server/dictionaries/{dictionaries_config}</dictionaries_config>
</yandex>'''


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

        copy_file_to_container(os.path.join(SCRIPT_DIR, 'dictionaries/.'), '/etc/clickhouse-server/dictionaries', node.docker_id)

        node.query("CREATE TABLE dictionary_values (id UInt64, value_1 String, value_2 String) ENGINE=TinyLog;")
        node.query("INSERT INTO dictionary_values VALUES (0, 'Value_1', 'Value_2')")

        node.restart_clickhouse()

        yield cluster

    finally:
        cluster.shutdown()


def change_config(dictionaries_config):
    node.replace_config("/etc/clickhouse-server/config.d/dictionaries_config.xml", config.format(dictionaries_config=dictionaries_config))
    node.query("SYSTEM RELOAD CONFIG;")


def test(started_cluster):
    # Set config with the path to the first dictionary.
    change_config("dictionary_config.xml")

    time.sleep(10)

    assert node.query("SELECT dictGet('test_dictionary_1', 'value_1', toUInt64(0));") == 'Value_1\n'

    # Change path to the second dictionary in config.
    change_config("dictionary_config2.xml")

    time.sleep(10)

    # Check that the new dictionary is loaded.
    assert node.query("SELECT dictGet('test_dictionary_2', 'value_2', toUInt64(0));") == 'Value_2\n'

    # Check that the previous dictionary was unloaded.
    node.query_and_get_error("SELECT dictGet('test_dictionary_1', 'value', toUInt64(0));")