from contextlib import contextmanager

## sudo -H pip install PyMySQL
import pymysql.cursors
import pytest
from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)

node1 = cluster.add_instance('node1', main_configs=['configs/remote_servers.xml'], with_mysql=True)
create_table_sql_template = """
    CREATE TABLE `clickhouse`.`{}` (
    `id` int(11) NOT NULL,
    `name` varchar(50) NOT NULL,
    `age` int  NOT NULL default 0,
    `money` int NOT NULL default 0,
    `source` enum('IP','URL') DEFAULT 'IP',
    PRIMARY KEY (`id`)) ENGINE=InnoDB;
    """


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

        conn = get_mysql_conn()
        ## create mysql db and table
        create_mysql_db(conn, 'clickhouse')
        yield cluster

    finally:
        cluster.shutdown()


def test_many_connections(started_cluster):
    table_name = 'test_many_connections'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)

    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse');
'''.format(table_name, table_name))

    node1.query("INSERT INTO {} (id, name) SELECT number, concat('name_', toString(number)) from numbers(10) ".format(table_name))

    query = "SELECT count() FROM ("
    for i in range (24):
        query += "SELECT id FROM {t} UNION ALL "
    query += "SELECT id FROM {t})"

    assert node1.query(query.format(t=table_name)) == '250\n'
    conn.close()

def test_insert_select(started_cluster):
    table_name = 'test_insert_select'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)

    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse');
'''.format(table_name, table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    assert node1.query("SELECT count() FROM {}".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT sum(money) FROM {}".format(table_name)).rstrip() == '30000'
    conn.close()


def test_replace_select(started_cluster):
    table_name = 'test_replace_select'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)

    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse', 1);
'''.format(table_name, table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    assert node1.query("SELECT count() FROM {}".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT sum(money) FROM {}".format(table_name)).rstrip() == '30000'
    conn.close()


def test_insert_on_duplicate_select(started_cluster):
    table_name = 'test_insert_on_duplicate_select'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)

    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse', 0, 'update money = money + values(money)');
'''.format(table_name, table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    assert node1.query("SELECT count() FROM {}".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT sum(money) FROM {}".format(table_name)).rstrip() == '60000'
    conn.close()


def test_where(started_cluster):
    table_name = 'test_where'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)
    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse');
'''.format(table_name, table_name))
    node1.query(
        "INSERT INTO {}(id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000) ".format(
            table_name))
    assert node1.query("SELECT count() FROM {} WHERE name LIKE '%name_%'".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT count() FROM {} WHERE name NOT LIKE '%tmp_%'".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT count() FROM {} WHERE money IN (1, 2, 3)".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT count() FROM {} WHERE money IN (1, 2, 4, 5, 6)".format(table_name)).rstrip() == '0'
    assert node1.query(
        "SELECT count() FROM {} WHERE money NOT IN (1, 2, 4, 5, 6)".format(table_name)).rstrip() == '10000'
    assert node1.query(
        "SELECT count() FROM {} WHERE name LIKE concat('name_', toString(1))".format(table_name)).rstrip() == '1'
    conn.close()


def test_table_function(started_cluster):
    conn = get_mysql_conn()
    create_mysql_table(conn, 'table_function')
    table_function = "mysql('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse')".format('table_function')
    assert node1.query("SELECT count() FROM {}".format(table_function)).rstrip() == '0'
    node1.query(
        "INSERT INTO {} (id, name, money) select number, concat('name_', toString(number)), 3 from numbers(10000)".format(
            'TABLE FUNCTION ' + table_function))
    assert node1.query("SELECT count() FROM {}".format(table_function)).rstrip() == '10000'
    assert node1.query("SELECT sum(c) FROM ("
                       "SELECT count() as c FROM {} WHERE id % 3 == 0"
                       " UNION ALL SELECT count() as c FROM {} WHERE id % 3 == 1"
                       " UNION ALL SELECT count() as c FROM {} WHERE id % 3 == 2)".format(table_function,
                                                                                          table_function,
                                                                                          table_function)).rstrip() == '10000'
    assert node1.query("SELECT sum(`money`) FROM {}".format(table_function)).rstrip() == '30000'
    node1.query("INSERT INTO {} (id, name, age, money) SELECT id + 100000, name, age, money FROM {}".format(
        'TABLE FUNCTION ' + table_function, table_function))
    assert node1.query("SELECT sum(`money`) FROM {}".format(table_function)).rstrip() == '60000'
    conn.close()


def test_enum_type(started_cluster):
    table_name = 'test_enum_type'
    conn = get_mysql_conn()
    create_mysql_table(conn, table_name)
    node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32, source Enum8('IP' = 1, 'URL' = 2)) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse', 1);
'''.format(table_name, table_name))
    node1.query("INSERT INTO {} (id, name, age, money, source) VALUES (1, 'name', 0, 0, 'URL')".format(table_name))
    assert node1.query("SELECT source FROM {} LIMIT 1".format(table_name)).rstrip() == 'URL'
    conn.close()


def get_mysql_conn():
    conn = pymysql.connect(user='root', password='clickhouse', host='127.0.0.1', port=3308)
    return conn


def create_mysql_db(conn, name):
    with conn.cursor() as cursor:
        cursor.execute(
            "CREATE DATABASE {} DEFAULT CHARACTER SET 'utf8'".format(name))


def create_mysql_table(conn, tableName):
    with conn.cursor() as cursor:
        cursor.execute(create_table_sql_template.format(tableName))


if __name__ == '__main__':
    with contextmanager(started_cluster)() as cluster:
        for name, instance in list(cluster.instances.items()):
            print(name, instance.ip_address)
        input("Cluster created, press any key to destroy...")