# This test is a subset of the 01223_dist_on_dist.
# (just in case, with real separate instances).

from __future__ import print_function

import sys
import time
import itertools
import timeit
import logging

import pytest

from helpers.uclient import client, prompt, end_of_block
from helpers.cluster import ClickHouseCluster
from helpers.network import PartitionManager
from helpers.test_tools import TSV

cluster = ClickHouseCluster(__file__)

NODES = {'node' + str(i): cluster.add_instance(
    'node' + str(i),
    main_configs=['configs/remote_servers.xml'],
    user_configs=['configs/set_distributed_defaults.xml'],
) for i in (1, 2)}

CREATE_TABLES_SQL = '''
DROP TABLE IF EXISTS lv_over_base_table;
DROP TABLE IF EXISTS distributed_table;
DROP TABLE IF EXISTS base_table;

SET allow_experimental_live_view = 1;

CREATE TABLE
    base_table(
        node String,
        key Int32,
        value Int32
    )
ENGINE = Memory;

CREATE LIVE VIEW lv_over_base_table AS SELECT * FROM base_table;

CREATE TABLE
    distributed_table
AS base_table
ENGINE = Distributed(test_cluster, default, base_table, rand());
'''

INSERT_SQL_TEMPLATE = "INSERT INTO base_table VALUES ('{node_id}', {key}, {value})"

@pytest.fixture(scope="function")
def started_cluster():
    try:
        cluster.start()
        for node_index, (node_name, node) in enumerate(NODES.items()):
            node.query(CREATE_TABLES_SQL)
            for i in range(0, 2):
                sql = INSERT_SQL_TEMPLATE.format(node_id=node_name, key=i, value=i + (node_index * 10))
                node.query(sql)
        yield cluster

    finally:
        cluster.shutdown()


@pytest.mark.parametrize("node", NODES.values()[:1])
@pytest.mark.parametrize("source", ["lv_over_distributed_table"])
class TestLiveViewOverDistributedSuite:
    def test_distributed_over_live_view_sum(self, started_cluster, node, source):
        log = sys.stdout
        node0, node1 = NODES.values()

        with client(name="client1> ", log=log, command=" ".join(node0.client.command)) as client1, \
                client(name="client2> ", log=log, command=" ".join(node1.client.command)) as client2:
            client1.expect(prompt)
            client2.expect(prompt)

            client1.send("DROP TABLE IF EXISTS distributed_over_lv")
            client1.expect(prompt)
            client1.send("CREATE TABLE distributed_over_lv AS lv_over_base_table ENGINE = Distributed(test_cluster, default, lv_over_base_table)")
            client1.expect(prompt)

            client1.send("SELECT sum(value) FROM distributed_over_lv")
            client1.expect(r"22" + end_of_block)
            client1.expect(prompt)

            client2.send("INSERT INTO distributed_table VALUES ('node1', 2, 2)")
            client2.expect(prompt)
            
            time.sleep(2)

            client1.send("SELECT sum(value) FROM distributed_over_lv")
            client1.expect(r"24" + end_of_block)
            client1.expect(prompt)

            client2.send("INSERT INTO distributed_table VALUES ('node1', 3, 3), ('node1', 4, 4)")
            client2.expect(prompt)

            time.sleep(2)

            client1.send("SELECT sum(value) FROM distributed_over_lv")
            client1.expect(r"31" + end_of_block)
            client1.expect(prompt)