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_in_partition_background(started_cluster):
    try:
        numbers = 100

        name = "test_mutations_in_partition"
        instance_test_mutations.query(
            f'''CREATE TABLE {name} (date Date, a UInt64, b String) ENGINE = MergeTree() ORDER BY tuple() PARTITION BY a''')
        instance_test_mutations.query(
            f'''INSERT INTO {name} SELECT '2019-07-29' AS date, number, toString(number) FROM numbers({numbers})''')

        for i in range(0, numbers, 3):
            instance_test_mutations.query(f'''ALTER TABLE {name} DELETE IN PARTITION {i} WHERE a = {i}''')

        for i in range(1, numbers, 3):
            instance_test_mutations.query(f'''ALTER TABLE {name} UPDATE b = 'changed' IN PARTITION {i} WHERE a = {i} ''')

        def count_and_changed():
            return instance_test_mutations.query(f"SELECT count(), countIf(b == 'changed') FROM {name} SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines()

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

            if count_and_changed() == ["66,33"]:
                all_done = True
                break

        print(instance_test_mutations.query(
            f"SELECT mutation_id, command, parts_to_do, is_done, latest_failed_part, latest_fail_reason, parts_to_do_names FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT TSVWithNames"))

        assert (count_and_changed(), all_done) == (["66,33"], True)
        assert instance_test_mutations.query(f"SELECT count(), sum(is_done) FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines() == ["67,67"]

    finally:
        instance_test_mutations.query(f'''DROP TABLE {name}''')


@pytest.mark.parametrize("sync", [
    ("last",),
    ("all",)
])
def test_mutations_in_partition_sync(started_cluster, sync):
    try:
        numbers = 10

        name = "test_mutations_in_partition_sync"
        instance_test_mutations.query(
            f'''CREATE TABLE {name} (date Date, a UInt64, b String) ENGINE = MergeTree() ORDER BY tuple() PARTITION BY a''')
        instance_test_mutations.query(
            f'''INSERT INTO {name} SELECT '2019-07-29' AS date, number, toString(number) FROM numbers({numbers})''')

        for i in range(0, numbers, 3):
            instance_test_mutations.query(f'''ALTER TABLE {name} DELETE IN PARTITION {i} WHERE a = {i}'''
                                          + (' SETTINGS mutations_sync = 1' if sync == 'all' else ''))

        for reverse_index, i in reversed(list(enumerate(reversed(range(1, numbers, 3))))):
            instance_test_mutations.query(f'''ALTER TABLE {name} UPDATE b = 'changed' IN PARTITION {i} WHERE a = {i}'''
                                          + (' SETTINGS mutations_sync = 1' if not reverse_index or sync == 'all' else ''))

        def count_and_changed():
            return instance_test_mutations.query(f"SELECT count(), countIf(b == 'changed') FROM {name} SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines()

        print(instance_test_mutations.query(
            f"SELECT mutation_id, command, parts_to_do, is_done, latest_failed_part, latest_fail_reason FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT TSVWithNames"))

        assert count_and_changed() == ["6,3"]
        assert instance_test_mutations.query(f"SELECT count(), sum(is_done) FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines() == ["7,7"]

    finally:
        instance_test_mutations.query(f'''DROP TABLE {name}''')


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'


def test_mutations_will_not_hang_for_non_existing_parts_sync(started_cluster):
    try:
        numbers = 100

        name = "test_mutations_will_not_hang_for_non_existing_parts_sync"
        instance_test_mutations.query(
            f"""CREATE TABLE {name} (date Date, a UInt64, b String) ENGINE = MergeTree() ORDER BY tuple() PARTITION BY a""")
        instance_test_mutations.query(
            f"""INSERT INTO {name} SELECT '2019-07-29' AS date, number, toString(number) FROM numbers({numbers})""")

        for i in range(0, numbers, 3):
            instance_test_mutations.query(f"""ALTER TABLE {name} DELETE IN PARTITION {i+1000} WHERE a = {i} SETTINGS mutations_sync = 1""")

        def count():
            return instance_test_mutations.query(f"SELECT count() FROM {name} SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines()

        print(instance_test_mutations.query(
            f"SELECT mutation_id, command, parts_to_do, is_done, latest_failed_part, latest_fail_reason, parts_to_do_names FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT TSVWithNames"))

        assert count() == [f"{numbers}"]
        assert instance_test_mutations.query(f"SELECT count(), sum(is_done) FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines() == [f"34,34"]

    finally:
        instance_test_mutations.query(f"""DROP TABLE {name}""")


def test_mutations_will_not_hang_for_non_existing_parts_async(started_cluster):
    try:
        numbers = 100

        name = "test_mutations_will_not_hang_for_non_existing_parts_async"
        instance_test_mutations.query(
            f"""CREATE TABLE {name} (date Date, a UInt64, b String) ENGINE = MergeTree() ORDER BY tuple() PARTITION BY a""")
        instance_test_mutations.query(
            f"""INSERT INTO {name} SELECT '2019-07-29' AS date, number, toString(number) FROM numbers({numbers})""")

        for i in range(0, numbers, 3):
            instance_test_mutations.query(f"""ALTER TABLE {name} DELETE IN PARTITION {i+1000} WHERE a = {i}""")

        def count():
            return instance_test_mutations.query(f"SELECT count() FROM {name} SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines()

        def count_and_sum_is_done():
            return instance_test_mutations.query(f"SELECT count(), sum(is_done) FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT CSV").splitlines()

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

            if count_and_sum_is_done() == ["34,34"]:
                all_done = True
                break

        print(instance_test_mutations.query(
            f"SELECT mutation_id, command, parts_to_do, is_done, latest_failed_part, latest_fail_reason, parts_to_do_names FROM system.mutations WHERE table = '{name}' SETTINGS force_index_by_date = 0, force_primary_key = 0 FORMAT TSVWithNames"))

        assert count() == [f"{numbers}"]
        assert count_and_sum_is_done() == ["34,34"]

    finally:
        instance_test_mutations.query(f"""DROP TABLE {name}""")