#!/usr/bin/env python3

import pytest
from helpers.cluster import ClickHouseCluster
import os
from kazoo.client import KazooClient, KazooState

cluster = ClickHouseCluster(__file__)
CONFIG_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'configs')

node1 = cluster.add_instance('node1', main_configs=['configs/enable_keeper1.xml'], stay_alive=True)
node2 = cluster.add_instance('node2', main_configs=['configs/enable_keeper2.xml'], stay_alive=True)
node3 = cluster.add_instance('node3', main_configs=['configs/enable_keeper3.xml'], stay_alive=True)

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

        yield cluster

    finally:
        cluster.shutdown()


def get_fake_zk(node, timeout=30.0):
    _fake_zk_instance = KazooClient(hosts=cluster.get_instance_ip(node.name) + ":9181", timeout=timeout)
    _fake_zk_instance.start()
    return _fake_zk_instance


def test_nodes_remove(started_cluster):
    zk_conn = get_fake_zk(node1)

    for i in range(100):
        zk_conn.create("/test_two_" + str(i), b"somedata")

    zk_conn2 = get_fake_zk(node2)
    zk_conn2.sync("/test_two_0")

    zk_conn3 = get_fake_zk(node3)
    zk_conn3.sync("/test_two_0")

    for i in range(100):
        assert zk_conn2.exists("test_two_" + str(i)) is not None
        assert zk_conn3.exists("test_two_" + str(i)) is not None

    node2.copy_file_to_container(os.path.join(CONFIG_DIR, "enable_keeper_two_nodes_2.xml"), "/etc/clickhouse-server/config.d/enable_keeper2.xml")
    node1.copy_file_to_container(os.path.join(CONFIG_DIR, "enable_keeper_two_nodes_1.xml"), "/etc/clickhouse-server/config.d/enable_keeper1.xml")

    node1.query("SYSTEM RELOAD CONFIG")
    node2.query("SYSTEM RELOAD CONFIG")

    zk_conn2 = get_fake_zk(node2)

    for i in range(100):
        assert zk_conn2.exists("test_two_" + str(i)) is not None
        zk_conn2.create("/test_two_" + str(100 + i), b"otherdata")

    zk_conn = get_fake_zk(node1)
    zk_conn.sync("/test_two_0")

    for i in range(100):
        assert zk_conn.exists("test_two_" + str(i)) is not None
        assert zk_conn.exists("test_two_" + str(100 + i)) is not None

    with pytest.raises(Exception):
        zk_conn3 = get_fake_zk(node3)
        zk_conn3.sync("/test_two_0")

    node3.stop_clickhouse()

    node1.copy_file_to_container(os.path.join(CONFIG_DIR, "enable_single_keeper1.xml"), "/etc/clickhouse-server/config.d/enable_keeper1.xml")

    node1.query("SYSTEM RELOAD CONFIG")
    zk_conn = get_fake_zk(node1)
    zk_conn.sync("/test_two_0")

    for i in range(100):
        assert zk_conn.exists("test_two_" + str(i)) is not None
        assert zk_conn.exists("test_two_" + str(100 + i)) is not None

    with pytest.raises(Exception):
        zk_conn2 = get_fake_zk(node2)
        zk_conn2.sync("/test_two_0")

    node2.stop_clickhouse()