#!/usr/bin/env python3
import pytest
from helpers.cluster import ClickHouseCluster
from kazoo.client import KazooClient, KazooState
from kazoo.security import ACL, make_digest_acl, make_acl
from kazoo.exceptions import AuthFailedError, InvalidACLError, NoAuthError, KazooException
import os

cluster = ClickHouseCluster(__file__)

node = cluster.add_instance('node', main_configs=['configs/keeper_config.xml', 'configs/logs_conf.xml'], stay_alive=True)

def start_zookeeper():
    node.exec_in_container(['bash', '-c', '/opt/zookeeper/bin/zkServer.sh start'])

def stop_zookeeper():
    node.exec_in_container(['bash', '-c', '/opt/zookeeper/bin/zkServer.sh stop'])

def clear_zookeeper():
    node.exec_in_container(['bash', '-c', 'rm -fr /zookeeper/*'])

def restart_and_clear_zookeeper():
    stop_zookeeper()
    clear_zookeeper()
    start_zookeeper()

def clear_clickhouse_data():
    node.exec_in_container(['bash', '-c', 'rm -fr /var/lib/clickhouse/coordination/logs/* /var/lib/clickhouse/coordination/snapshots/*'])

def convert_zookeeper_data():
    cmd = '/usr/bin/clickhouse keeper-converter --zookeeper-logs-dir /zookeeper/version-2/ --zookeeper-snapshots-dir  /zookeeper/version-2/ --output-dir /var/lib/clickhouse/coordination/snapshots'
    node.exec_in_container(['bash', '-c', cmd])

def stop_clickhouse():
    node.stop_clickhouse()

def start_clickhouse():
    node.start_clickhouse()

def copy_zookeeper_data():
    stop_zookeeper()
    stop_clickhouse()
    clear_clickhouse_data()
    convert_zookeeper_data()
    print(node.exec_in_container)
    start_zookeeper()
    start_clickhouse()

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

        yield cluster

    finally:
        cluster.shutdown()

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

def get_genuine_zk(timeout=30.0):
    _genuine_zk_instance = KazooClient(hosts=cluster.get_instance_ip('node') + ":2181", timeout=timeout)
    _genuine_zk_instance.start()
    return _genuine_zk_instance

def compare_stats(stat1, stat2, path):
    assert stat1.czxid == stat2.czxid, "path " + path + " cxzids not equal for stats: " + str(stat1.czxid) + " != " + str(stat2.zxid)
    assert stat1.mzxid == stat2.mzxid, "path " + path + " mxzids not equal for stats: " + str(stat1.mzxid) + " != " + str(stat2.mzxid)
    assert stat1.version == stat2.version, "path " + path + " versions not equal for stats: " + str(stat1.version) + " != " + str(stat2.version)
    assert stat1.cversion == stat2.cversion, "path " + path + " cversions not equal for stats: " + str(stat1.cversion) + " != " + str(stat2.cversion)
    assert stat1.aversion == stat2.aversion, "path " + path + " aversions not equal for stats: " + str(stat1.aversion) + " != " + str(stat2.aversion)
    assert stat1.ephemeralOwner == stat2.ephemeralOwner,"path " + path + " ephemeralOwners not equal for stats: " + str(stat1.ephemeralOwner) + " != " + str(stat2.ephemeralOwner)
    assert stat1.dataLength == stat2.dataLength , "path " + path + " ephemeralOwners not equal for stats: " + str(stat1.dataLength) + " != " + str(stat2.dataLength)
    assert stat1.numChildren == stat2.numChildren, "path " + path + " numChildren not equal for stats: " + str(stat1.numChildren) + " != " + str(stat2.numChildren)
    assert stat1.pzxid == stat2.pzxid, "path " + path + " pzxid not equal for stats: " + str(stat1.pzxid) + " != " + str(stat2.pzxid)

def compare_states(zk1, zk2, path="/"):
    data1, stat1 = zk1.get(path)
    data2, stat2 = zk2.get(path)
    print("Left Stat", stat1)
    print("Right Stat", stat2)
    assert data1 == data2, "Data not equal on path " + str(path)
    # both paths have strange stats
    if path not in ("/", "/zookeeper"):
        compare_stats(stat1, stat2, path)

    first_children = list(sorted(zk1.get_children(path)))
    second_children = list(sorted(zk2.get_children(path)))
    print("Got children left", first_children)
    print("Got children rigth", second_children)
    assert first_children == second_children, "Childrens are not equal on path " + path

    for children in first_children:
        print("Checking child", os.path.join(path, children))
        compare_states(zk1, zk2, os.path.join(path, children))

def test_smoke(started_cluster):
    restart_and_clear_zookeeper()

    genuine_connection = get_genuine_zk()
    genuine_connection.create("/test", b"data")

    assert genuine_connection.get("/test")[0] == b"data"

    copy_zookeeper_data()

    genuine_connection = get_genuine_zk()
    fake_connection = get_fake_zk()

    compare_states(genuine_connection, fake_connection)

def get_bytes(s):
    return s.encode()

def test_simple_crud_requests(started_cluster):
    restart_and_clear_zookeeper()

    genuine_connection = get_genuine_zk()
    for i in range(100):
        genuine_connection.create("/test_create" + str(i), get_bytes("data" + str(i)))

    # some set queries
    for i in range(10):
        for j in range(i + 1):
            genuine_connection.set("/test_create" + str(i), get_bytes("value" + str(j)))

    for i in range(10, 20):
        genuine_connection.delete("/test_create" + str(i))

    path = "/test_create_deep"
    for i in range(10):
        genuine_connection.create(path, get_bytes("data" + str(i)))
        path = os.path.join(path, str(i))


    genuine_connection.create("/test_sequential", b"")
    for i in range(10):
        genuine_connection.create("/test_sequential/" + "a" * i + "-", get_bytes("dataX" + str(i)), sequence=True)

    genuine_connection.create("/test_ephemeral", b"")
    for i in range(10):
        genuine_connection.create("/test_ephemeral/" + str(i), get_bytes("dataX" + str(i)), ephemeral=True)

    copy_zookeeper_data()

    genuine_connection = get_genuine_zk()
    fake_connection = get_fake_zk()

    compare_states(genuine_connection, fake_connection)

    # especially ensure that counters are the same
    genuine_connection.create("/test_sequential/" + "a" * 10 + "-", get_bytes("dataX" + str(i)), sequence=True)
    fake_connection.create("/test_sequential/" + "a" * 10 + "-", get_bytes("dataX" + str(i)), sequence=True)

    first_children = list(sorted(genuine_connection.get_children("/test_sequential")))
    second_children = list(sorted(fake_connection.get_children("/test_sequential")))
    assert first_children == second_children, "Childrens are not equal on path " + path


def test_multi_and_failed_requests(started_cluster):
    restart_and_clear_zookeeper()

    genuine_connection = get_genuine_zk()
    genuine_connection.create('/test_multitransactions')
    for i in range(10):
        t = genuine_connection.transaction()
        t.create('/test_multitransactions/freddy' + str(i), get_bytes('data' + str(i)))
        t.create('/test_multitransactions/fred' + str(i), get_bytes('value' + str(i)), ephemeral=True)
        t.create('/test_multitransactions/smith' + str(i), get_bytes('entity' + str(i)), sequence=True)
        t.set_data('/test_multitransactions', get_bytes("somedata" + str(i)))
        t.commit()

    with pytest.raises(Exception):
        genuine_connection.set('/test_multitransactions/freddy0', get_bytes('mustfail' + str(i)), version=1)

    t = genuine_connection.transaction()

    t.create('/test_bad_transaction', get_bytes('data' + str(1)))
    t.check('/test_multitransactions', version=32)
    t.create('/test_bad_transaction1', get_bytes('data' + str(2)))
    # should fail
    t.commit()

    assert genuine_connection.exists('/test_bad_transaction') is None
    assert genuine_connection.exists('/test_bad_transaction1') is None

    t = genuine_connection.transaction()
    t.create('/test_bad_transaction2', get_bytes('data' + str(1)))
    t.delete('/test_multitransactions/freddy0', version=5)

    # should fail
    t.commit()
    assert genuine_connection.exists('/test_bad_transaction2') is None
    assert genuine_connection.exists('/test_multitransactions/freddy0') is not None

    copy_zookeeper_data()

    genuine_connection = get_genuine_zk()
    fake_connection = get_fake_zk()

    compare_states(genuine_connection, fake_connection)


def test_acls(started_cluster):
    restart_and_clear_zookeeper()
    genuine_connection = get_genuine_zk()
    genuine_connection.add_auth('digest', 'user1:password1')
    genuine_connection.add_auth('digest', 'user2:password2')
    genuine_connection.add_auth('digest', 'user3:password3')

    genuine_connection.create("/test_multi_all_acl", b"data", acl=[make_acl("auth", "", all=True)])

    other_connection = get_genuine_zk()
    other_connection.add_auth('digest', 'user1:password1')
    other_connection.set("/test_multi_all_acl", b"X")
    assert other_connection.get("/test_multi_all_acl")[0] == b"X"

    yet_other_auth_connection = get_genuine_zk()
    yet_other_auth_connection.add_auth('digest', 'user2:password2')

    yet_other_auth_connection.set("/test_multi_all_acl", b"Y")

    copy_zookeeper_data()

    genuine_connection = get_genuine_zk()
    genuine_connection.add_auth('digest', 'user1:password1')
    genuine_connection.add_auth('digest', 'user2:password2')
    genuine_connection.add_auth('digest', 'user3:password3')

    fake_connection = get_fake_zk()
    fake_connection.add_auth('digest', 'user1:password1')
    fake_connection.add_auth('digest', 'user2:password2')
    fake_connection.add_auth('digest', 'user3:password3')

    compare_states(genuine_connection, fake_connection)