import time

import pytest
from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)

instance_test_mutations = cluster.add_instance('test_mutations_with_merge_tree', main_configs=['configs/config.xml'],
                                               user_configs=['configs/users.xml'])


@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()
        instance_test_mutations.query(
            '''CREATE TABLE test_mutations_with_ast_elements(date Date, a UInt64, b String) ENGINE = MergeTree(date, (a, date), 8192)''')
        instance_test_mutations.query(
            '''INSERT INTO test_mutations_with_ast_elements SELECT '2019-07-29' AS date, 1, toString(number) FROM numbers(1) SETTINGS force_index_by_date = 0, force_primary_key = 0''')
        yield cluster
    finally:
        cluster.shutdown()


def test_mutations_with_merge_background_task(started_cluster):
    instance_test_mutations.query('''SYSTEM STOP MERGES test_mutations_with_ast_elements''')

    ## The number of asts per query is 15
    for execution_times_for_mutation in range(100):
        instance_test_mutations.query(
            '''ALTER TABLE test_mutations_with_ast_elements DELETE WHERE 1 = 1 AND toUInt32(b) IN (1)''')

    all_done = False
    for wait_times_for_mutation in range(100):  # wait for replication 80 seconds max
        time.sleep(0.8)

        def get_done_mutations(instance):
            instance_test_mutations.query('''DETACH TABLE test_mutations_with_ast_elements''')
            instance_test_mutations.query('''ATTACH TABLE test_mutations_with_ast_elements''')
            return int(instance.query(
                "SELECT sum(is_done) FROM system.mutations WHERE table = 'test_mutations_with_ast_elements' SETTINGS force_index_by_date = 0, force_primary_key = 0").rstrip())

        if get_done_mutations(instance_test_mutations) == 100:
            all_done = True
            break

    print(instance_test_mutations.query(
        "SELECT mutation_id, command, parts_to_do, is_done FROM system.mutations WHERE table = 'test_mutations_with_ast_elements' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT TSVWithNames"))
    assert all_done


def test_mutations_with_truncate_table(started_cluster):
    instance_test_mutations.query('''SYSTEM STOP MERGES test_mutations_with_ast_elements''')

    ## The number of asts per query is 15
    for execute_number in range(100):
        instance_test_mutations.query(
            '''ALTER TABLE test_mutations_with_ast_elements DELETE WHERE 1 = 1 AND toUInt32(b) IN (1)''')

    instance_test_mutations.query("TRUNCATE TABLE test_mutations_with_ast_elements")
    assert instance_test_mutations.query(
        "SELECT COUNT() FROM system.mutations WHERE table = 'test_mutations_with_ast_elements SETTINGS force_index_by_date = 0, force_primary_key = 0'").rstrip() == '0'