import pytest

from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)

node1 = cluster.add_instance("node1", with_zookeeper=True)
node2 = cluster.add_instance("node2", with_zookeeper=True)


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

        yield cluster

    finally:
        cluster.shutdown()


def corrupt_data_part_on_disk(node, table, part_name):
    part_path = node.query(
        "SELECT path FROM system.parts WHERE table = '{}' and name = '{}'".format(
            table, part_name
        )
    ).strip()
    node.exec_in_container(
        [
            "bash",
            "-c",
            "cd {p} && ls *.bin | head -n 1 | xargs -I{{}} sh -c 'echo \"1\" >> $1' -- {{}}".format(
                p=part_path
            ),
        ],
        privileged=True,
    )


def remove_checksums_on_disk(node, table, part_name):
    part_path = node.query(
        "SELECT path FROM system.parts WHERE table = '{}' and name = '{}'".format(
            table, part_name
        )
    ).strip()
    node.exec_in_container(
        ["bash", "-c", "rm -r {p}/checksums.txt".format(p=part_path)], privileged=True
    )


def remove_part_from_disk(node, table, part_name):
    part_path = node.query(
        "SELECT path FROM system.parts WHERE table = '{}' and name = '{}'".format(
            table, part_name
        )
    ).strip()
    if not part_path:
        raise Exception("Part " + part_name + "doesn't exist")
    node.exec_in_container(
        ["bash", "-c", "rm -r {p}/*".format(p=part_path)], privileged=True
    )


def test_check_normal_table_corruption(started_cluster):
    node1.query("DROP TABLE IF EXISTS non_replicated_mt")

    node1.query(
        """
        CREATE TABLE non_replicated_mt(date Date, id UInt32, value Int32)
        ENGINE = MergeTree() PARTITION BY toYYYYMM(date) ORDER BY id
        SETTINGS min_bytes_for_wide_part=0;
    """
    )

    node1.query(
        "INSERT INTO non_replicated_mt VALUES (toDate('2019-02-01'), 1, 10), (toDate('2019-02-01'), 2, 12)"
    )
    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt PARTITION 201902",
            settings={"check_query_single_value_result": 0},
        )
        == "201902_1_1_0\t1\t\n"
    )

    remove_checksums_on_disk(node1, "non_replicated_mt", "201902_1_1_0")

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt",
            settings={"check_query_single_value_result": 0},
        ).strip()
        == "201902_1_1_0\t1\tChecksums recounted and written to disk."
    )

    assert node1.query("SELECT COUNT() FROM non_replicated_mt") == "2\n"

    remove_checksums_on_disk(node1, "non_replicated_mt", "201902_1_1_0")

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt PARTITION 201902",
            settings={"check_query_single_value_result": 0},
        ).strip()
        == "201902_1_1_0\t1\tChecksums recounted and written to disk."
    )

    assert node1.query("SELECT COUNT() FROM non_replicated_mt") == "2\n"

    corrupt_data_part_on_disk(node1, "non_replicated_mt", "201902_1_1_0")

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt",
            settings={"check_query_single_value_result": 0},
        ).strip()
        == "201902_1_1_0\t0\tCannot read all data. Bytes read: 2. Bytes expected: 25."
    )

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt",
            settings={"check_query_single_value_result": 0},
        ).strip()
        == "201902_1_1_0\t0\tCannot read all data. Bytes read: 2. Bytes expected: 25."
    )

    node1.query(
        "INSERT INTO non_replicated_mt VALUES (toDate('2019-01-01'), 1, 10), (toDate('2019-01-01'), 2, 12)"
    )

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt PARTITION 201901",
            settings={"check_query_single_value_result": 0},
        )
        == "201901_2_2_0\t1\t\n"
    )

    corrupt_data_part_on_disk(node1, "non_replicated_mt", "201901_2_2_0")

    remove_checksums_on_disk(node1, "non_replicated_mt", "201901_2_2_0")

    assert (
        node1.query(
            "CHECK TABLE non_replicated_mt PARTITION 201901",
            settings={"check_query_single_value_result": 0},
        )
        == "201901_2_2_0\t0\tCheck of part finished with error: \\'Cannot read all data. Bytes read: 2. Bytes expected: 25.\\'\n"
    )


def test_check_replicated_table_simple(started_cluster):
    for node in [node1, node2]:
        node.query("DROP TABLE IF EXISTS replicated_mt")

        node.query(
            """
        CREATE TABLE replicated_mt(date Date, id UInt32, value Int32)
        ENGINE = ReplicatedMergeTree('/clickhouse/tables/replicated_mt', '{replica}') PARTITION BY toYYYYMM(date) ORDER BY id;
            """.format(
                replica=node.name
            )
        )

    node1.query(
        "INSERT INTO replicated_mt VALUES (toDate('2019-02-01'), 1, 10), (toDate('2019-02-01'), 2, 12)"
    )
    node2.query("SYSTEM SYNC REPLICA replicated_mt")

    assert node1.query("SELECT count() from replicated_mt") == "2\n"
    assert node2.query("SELECT count() from replicated_mt") == "2\n"

    assert (
        node1.query(
            "CHECK TABLE replicated_mt", settings={"check_query_single_value_result": 0}
        )
        == "201902_0_0_0\t1\t\n"
    )
    assert (
        node2.query(
            "CHECK TABLE replicated_mt", settings={"check_query_single_value_result": 0}
        )
        == "201902_0_0_0\t1\t\n"
    )

    node2.query(
        "INSERT INTO replicated_mt VALUES (toDate('2019-01-02'), 3, 10), (toDate('2019-01-02'), 4, 12)"
    )
    node1.query("SYSTEM SYNC REPLICA replicated_mt")
    assert node1.query("SELECT count() from replicated_mt") == "4\n"
    assert node2.query("SELECT count() from replicated_mt") == "4\n"

    assert (
        node1.query(
            "CHECK TABLE replicated_mt PARTITION 201901",
            settings={"check_query_single_value_result": 0},
        )
        == "201901_0_0_0\t1\t\n"
    )
    assert (
        node2.query(
            "CHECK TABLE replicated_mt PARTITION 201901",
            settings={"check_query_single_value_result": 0},
        )
        == "201901_0_0_0\t1\t\n"
    )


def test_check_replicated_table_corruption(started_cluster):
    for node in [node1, node2]:
        node.query_with_retry("DROP TABLE IF EXISTS replicated_mt_1")

        node.query_with_retry(
            """
        CREATE TABLE replicated_mt_1(date Date, id UInt32, value Int32)
        ENGINE = ReplicatedMergeTree('/clickhouse/tables/replicated_mt_1', '{replica}') PARTITION BY toYYYYMM(date) ORDER BY id;
            """.format(
                replica=node.name
            )
        )

    node1.query(
        "INSERT INTO replicated_mt_1 VALUES (toDate('2019-02-01'), 1, 10), (toDate('2019-02-01'), 2, 12)"
    )
    node1.query(
        "INSERT INTO replicated_mt_1 VALUES (toDate('2019-01-02'), 3, 10), (toDate('2019-01-02'), 4, 12)"
    )
    node2.query("SYSTEM SYNC REPLICA replicated_mt_1")

    assert node1.query("SELECT count() from replicated_mt_1") == "4\n"
    assert node2.query("SELECT count() from replicated_mt_1") == "4\n"

    part_name = node1.query_with_retry(
        "SELECT name from system.parts where table = 'replicated_mt_1' and partition_id = '201901' and active = 1"
    ).strip()

    corrupt_data_part_on_disk(node1, "replicated_mt_1", part_name)
    assert node1.query(
        "CHECK TABLE replicated_mt_1 PARTITION 201901",
        settings={"check_query_single_value_result": 0},
    ) == "{p}\t0\tPart {p} looks broken. Removing it and will try to fetch.\n".format(
        p=part_name
    )

    node1.query_with_retry("SYSTEM SYNC REPLICA replicated_mt_1")
    assert node1.query(
        "CHECK TABLE replicated_mt_1 PARTITION 201901",
        settings={"check_query_single_value_result": 0},
    ) == "{}\t1\t\n".format(part_name)
    assert node1.query("SELECT count() from replicated_mt_1") == "4\n"

    remove_part_from_disk(node2, "replicated_mt_1", part_name)
    assert node2.query(
        "CHECK TABLE replicated_mt_1 PARTITION 201901",
        settings={"check_query_single_value_result": 0},
    ) == "{p}\t0\tPart {p} looks broken. Removing it and will try to fetch.\n".format(
        p=part_name
    )

    node1.query("SYSTEM SYNC REPLICA replicated_mt_1")
    assert node1.query(
        "CHECK TABLE replicated_mt_1 PARTITION 201901",
        settings={"check_query_single_value_result": 0},
    ) == "{}\t1\t\n".format(part_name)
    assert node1.query("SELECT count() from replicated_mt_1") == "4\n"