import pytest
import time
import psycopg2
from multiprocessing.dummy import Pool

from helpers.cluster import ClickHouseCluster
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT

cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance('node1',
                             main_configs=['configs/config.xml', 'configs/dictionaries/postgres_dict.xml', 'configs/named_collections.xml'],
                             with_postgres=True, with_postgres_cluster=True)

postgres_dict_table_template = """
    CREATE TABLE IF NOT EXISTS {} (
    id Integer NOT NULL, key Integer NOT NULL, value Integer NOT NULL, PRIMARY KEY (id))
    """
click_dict_table_template = """
    CREATE TABLE IF NOT EXISTS `test`.`dict_table_{}` (
        `key` UInt32, `value` UInt32
    ) ENGINE = Dictionary({})
    """

def get_postgres_conn(ip, port, database=False):
    if database == True:
        conn_string = "host={} port={} dbname='clickhouse' user='postgres' password='mysecretpassword'".format(ip, port)
    else:
        conn_string = "host={} port={} user='postgres' password='mysecretpassword'".format(ip, port)

    conn = psycopg2.connect(conn_string)
    conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
    conn.autocommit = True
    return conn

def create_postgres_db(conn, name):
    cursor = conn.cursor()
    cursor.execute("CREATE DATABASE {}".format(name))

def create_postgres_table(cursor, table_name):
    cursor.execute(postgres_dict_table_template.format(table_name))

def create_and_fill_postgres_table(cursor, table_name, port, host):
    create_postgres_table(cursor, table_name)
    # Fill postgres table using clickhouse postgres table function and check
    table_func = '''postgresql('{}:{}', 'clickhouse', '{}', 'postgres', 'mysecretpassword')'''.format(host, port, table_name)
    node1.query('''INSERT INTO TABLE FUNCTION {} SELECT number, number, number from numbers(10000)
            '''.format(table_func, table_name))
    result = node1.query("SELECT count() FROM {}".format(table_func))
    assert result.rstrip() == '10000'

def create_dict(table_name, index=0):
    node1.query(click_dict_table_template.format(table_name, 'dict' + str(index)))


@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()
        node1.query("CREATE DATABASE IF NOT EXISTS test")

        postgres_conn = get_postgres_conn(ip=cluster.postgres_ip, port=cluster.postgres_port)
        print("postgres1 connected")
        create_postgres_db(postgres_conn, 'clickhouse')

        postgres_conn = get_postgres_conn(ip=cluster.postgres2_ip, port=cluster.postgres_port)
        print("postgres2 connected")
        create_postgres_db(postgres_conn, 'clickhouse')

        yield cluster

    finally:
        cluster.shutdown()


def test_load_dictionaries(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, database=True, port=started_cluster.postgres_port)
    cursor = conn.cursor()
    table_name = 'test0'
    create_and_fill_postgres_table(cursor, table_name, port=started_cluster.postgres_port, host=started_cluster.postgres_ip)
    create_dict(table_name)
    dict_name = 'dict0'

    node1.query("SYSTEM RELOAD DICTIONARY {}".format(dict_name))
    assert node1.query("SELECT count() FROM `test`.`dict_table_{}`".format(table_name)).rstrip() == '10000'
    assert node1.query("SELECT dictGetUInt32('{}', 'key', toUInt64(0))".format(dict_name)) == '0\n'
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(9999))".format(dict_name)) == '9999\n'

    cursor.execute("DROP TABLE IF EXISTS {}".format(table_name))
    node1.query("DROP TABLE IF EXISTS {}".format(table_name))
    node1.query("DROP DICTIONARY IF EXISTS {}".format(dict_name))


def test_postgres_dictionaries_custom_query_full_load(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, database=True, port=started_cluster.postgres_port)
    cursor = conn.cursor()

    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_1 (id Integer, value_1 Text);")
    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_2 (id Integer, value_2 Text);")
    cursor.execute("INSERT INTO test_table_1 VALUES (1, 'Value_1');")
    cursor.execute("INSERT INTO test_table_2 VALUES (1, 'Value_2');")

    query = node1.query
    query("""
    CREATE DICTIONARY test_dictionary_custom_query
    (
        id UInt64,
        value_1 String,
        value_2 String
    )
    PRIMARY KEY id
    LAYOUT(FLAT())
    SOURCE(PostgreSQL(
        DB 'clickhouse'
        HOST '{}'
        PORT {}
        USER 'postgres'
        PASSWORD 'mysecretpassword'
        QUERY $doc$SELECT id, value_1, value_2 FROM test_table_1 INNER JOIN test_table_2 USING (id);$doc$))
    LIFETIME(0)
    """.format(started_cluster.postgres_ip, started_cluster.postgres_port))

    result = query("SELECT id, value_1, value_2 FROM test_dictionary_custom_query")

    assert result == '1\tValue_1\tValue_2\n'

    query("DROP DICTIONARY test_dictionary_custom_query;")

    cursor.execute("DROP TABLE test_table_2;")
    cursor.execute("DROP TABLE test_table_1;")


def test_postgres_dictionaries_custom_query_partial_load_simple_key(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, database=True, port=started_cluster.postgres_port)
    cursor = conn.cursor()

    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_1 (id Integer, value_1 Text);")
    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_2 (id Integer, value_2 Text);")
    cursor.execute("INSERT INTO test_table_1 VALUES (1, 'Value_1');")
    cursor.execute("INSERT INTO test_table_2 VALUES (1, 'Value_2');")

    query = node1.query
    query("""
    CREATE DICTIONARY test_dictionary_custom_query
    (
        id UInt64,
        value_1 String,
        value_2 String
    )
    PRIMARY KEY id
    LAYOUT(DIRECT())
    SOURCE(PostgreSQL(
        DB 'clickhouse'
        HOST '{}'
        PORT {}
        USER 'postgres'
        PASSWORD 'mysecretpassword'
        QUERY $doc$SELECT id, value_1, value_2 FROM test_table_1 INNER JOIN test_table_2 USING (id) WHERE {{condition}};$doc$))
    """.format(started_cluster.postgres_ip, started_cluster.postgres_port))

    result = query("SELECT dictGet('test_dictionary_custom_query', ('value_1', 'value_2'), toUInt64(1))")

    assert result == '(\'Value_1\',\'Value_2\')\n'

    query("DROP DICTIONARY test_dictionary_custom_query;")

    cursor.execute("DROP TABLE test_table_2;")
    cursor.execute("DROP TABLE test_table_1;")


def test_postgres_dictionaries_custom_query_partial_load_complex_key(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, database=True, port=started_cluster.postgres_port)
    cursor = conn.cursor()

    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_1 (id Integer, key Text, value_1 Text);")
    cursor.execute("CREATE TABLE IF NOT EXISTS test_table_2 (id Integer, key Text, value_2 Text);")
    cursor.execute("INSERT INTO test_table_1 VALUES (1, 'Key', 'Value_1');")
    cursor.execute("INSERT INTO test_table_2 VALUES (1, 'Key', 'Value_2');")

    query = node1.query
    query("""
    CREATE DICTIONARY test_dictionary_custom_query
    (
        id UInt64,
        key String,
        value_1 String,
        value_2 String
    )
    PRIMARY KEY id, key
    LAYOUT(COMPLEX_KEY_DIRECT())
    SOURCE(PostgreSQL(
        DB 'clickhouse'
        HOST '{}'
        PORT {}
        USER 'postgres'
        PASSWORD 'mysecretpassword'
        QUERY $doc$SELECT id, key, value_1, value_2 FROM test_table_1 INNER JOIN test_table_2 USING (id, key) WHERE {{condition}};$doc$))
    """.format(started_cluster.postgres_ip, started_cluster.postgres_port))

    result = query("SELECT dictGet('test_dictionary_custom_query', ('value_1', 'value_2'), (toUInt64(1), 'Key'))")

    assert result == '(\'Value_1\',\'Value_2\')\n'

    query("DROP DICTIONARY test_dictionary_custom_query;")

    cursor.execute("DROP TABLE test_table_2;")
    cursor.execute("DROP TABLE test_table_1;")

def test_invalidate_query(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, database=True, port=started_cluster.postgres_port)
    cursor = conn.cursor()
    table_name = 'test0'
    create_and_fill_postgres_table(cursor, table_name, port=started_cluster.postgres_port, host=started_cluster.postgres_ip)

    # invalidate query: SELECT value FROM test0 WHERE id = 0
    dict_name = 'dict0'
    create_dict(table_name)
    node1.query("SYSTEM RELOAD DICTIONARY {}".format(dict_name))
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(0))".format(dict_name)) ==  "0\n"
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(1))".format(dict_name)) ==  "1\n"

    # update should happen
    cursor.execute("UPDATE {} SET value=value+1 WHERE id = 0".format(table_name))
    while True:
        result = node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(0))".format(dict_name))
        if result != '0\n':
            break
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(0))".format(dict_name)) == '1\n'

    # no update should happen
    cursor.execute("UPDATE {} SET value=value*2 WHERE id != 0".format(table_name))
    time.sleep(5)
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(0))".format(dict_name)) == '1\n'
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(1))".format(dict_name)) == '1\n'

    # update should happen
    cursor.execute("UPDATE {} SET value=value+1 WHERE id = 0".format(table_name))
    time.sleep(5)
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(0))".format(dict_name)) == '2\n'
    assert node1.query("SELECT dictGetUInt32('{}', 'value', toUInt64(1))".format(dict_name)) == '2\n'

    node1.query("DROP TABLE IF EXISTS {}".format(table_name))
    node1.query("DROP DICTIONARY IF EXISTS {}".format(dict_name))
    cursor.execute("DROP TABLE IF EXISTS {}".format(table_name))


def test_dictionary_with_replicas(started_cluster):
    conn1 = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port, database=True)
    cursor1 = conn1.cursor()
    conn2 = get_postgres_conn(ip=started_cluster.postgres2_ip, port=started_cluster.postgres_port, database=True)
    cursor2 = conn2.cursor()

    create_postgres_table(cursor1, 'test1')
    create_postgres_table(cursor2, 'test1')

    cursor1.execute('INSERT INTO test1 select i, i, i from generate_series(0, 99) as t(i);')
    cursor2.execute('INSERT INTO test1 select i, i, i from generate_series(100, 199) as t(i);')

    create_dict('test1', 1)
    result = node1.query("SELECT * FROM `test`.`dict_table_test1` ORDER BY key")

    # priority 0 - non running port
    assert node1.contains_in_log('PostgreSQLConnectionPool: Connection error*')

    # priority 1 - postgres2, table contains rows with values 100-200
    # priority 2 - postgres1, table contains rows with values 0-100
    expected = node1.query("SELECT number, number FROM numbers(100, 100)")
    assert(result == expected)

    cursor1.execute("DROP TABLE IF EXISTS test1")
    cursor2.execute("DROP TABLE IF EXISTS test1")

    node1.query("DROP TABLE IF EXISTS test1")
    node1.query("DROP DICTIONARY IF EXISTS dict1")


def test_postgres_schema(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port, database=True)
    cursor = conn.cursor()

    cursor.execute('CREATE SCHEMA test_schema')
    cursor.execute('CREATE TABLE test_schema.test_table (id integer, value integer)')
    cursor.execute('INSERT INTO test_schema.test_table SELECT i, i FROM generate_series(0, 99) as t(i)')

    node1.query('''
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(
        port 5432
        host 'postgres1'
        user  'postgres'
        password 'mysecretpassword'
        db 'clickhouse'
        table 'test_schema.test_table'))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')

    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(1))")
    assert(int(result.strip()) == 1)
    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")
    assert(int(result.strip()) == 99)
    node1.query("DROP DICTIONARY IF EXISTS postgres_dict")


def test_predefined_connection_configuration(started_cluster):
    conn = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port, database=True)
    cursor = conn.cursor()

    cursor.execute('DROP TABLE IF EXISTS test_table')
    cursor.execute('CREATE TABLE test_table (id integer, value integer)')
    cursor.execute('INSERT INTO test_table SELECT i, i FROM generate_series(0, 99) as t(i)')

    node1.query('''
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(NAME postgres1))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')
    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")
    assert(int(result.strip()) == 99)

    cursor.execute('DROP SCHEMA IF EXISTS test_schema CASCADE')
    cursor.execute('CREATE SCHEMA test_schema')
    cursor.execute('CREATE TABLE test_schema.test_table (id integer, value integer)')
    cursor.execute('INSERT INTO test_schema.test_table SELECT i, 100 FROM generate_series(0, 99) as t(i)')

    node1.query('''
    DROP DICTIONARY postgres_dict;
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(NAME postgres1 SCHEMA test_schema))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')
    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")
    assert(int(result.strip()) == 100)

    node1.query('''
    DROP DICTIONARY postgres_dict;
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(NAME postgres2))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')
    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")
    assert(int(result.strip()) == 100)

    node1.query('DROP DICTIONARY postgres_dict')
    node1.query('''
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(NAME postgres4))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')
    result = node1.query_and_get_error("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")

    node1.query('''
    DROP DICTIONARY postgres_dict;
    CREATE DICTIONARY postgres_dict (id UInt32, value UInt32)
    PRIMARY KEY id
    SOURCE(POSTGRESQL(NAME postgres1 PORT 5432))
        LIFETIME(MIN 1 MAX 2)
        LAYOUT(HASHED());
    ''')
    result = node1.query("SELECT dictGetUInt32(postgres_dict, 'value', toUInt64(99))")
    assert(int(result.strip()) == 99)


if __name__ == '__main__':
    cluster.start()
    input("Cluster created, press any key to destroy...")
    cluster.shutdown()