import uuid

import pytest

from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)

node1 = cluster.add_instance(
    "node1",
    main_configs=["configs/remote_servers.xml", "configs/merge_tree_uuids.xml"],
    with_zookeeper=True,
)

node2 = cluster.add_instance(
    "node2",
    main_configs=[
        "configs/remote_servers.xml",
        "configs/merge_tree_uuids.xml",
        "configs/merge_tree_in_memory.xml",
    ],
    with_zookeeper=True,
)


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


def test_part_uuid(started_cluster):
    uuid_zero = uuid.UUID(bytes=b"\x00" * 16)

    for ix, n in enumerate([node1, node2]):
        n.query(
            """
        CREATE TABLE t(key UInt64, value UInt64)
        ENGINE ReplicatedMergeTree('/clickhouse/tables/t', '{}')
        ORDER BY tuple()
        """.format(
                ix
            )
        )

    # Test insert assigns uuid to part.
    node1.query("INSERT INTO t VALUES (1, 1)")

    uuids = set()
    for node in [node1, node2]:
        node.query("SYSTEM SYNC REPLICA t")
        part_initial_uuid = uuid.UUID(
            node.query(
                "SELECT uuid FROM system.parts WHERE table = 't' AND active ORDER BY name"
            ).strip()
        )
        uuids.add(part_initial_uuid)
        assert uuid_zero != part_initial_uuid
    assert len(uuids) == 1, "expect the same uuid on all the replicas"

    # Test detach / attach.
    node1.query(
        "ALTER TABLE t DETACH PARTITION tuple(); ALTER TABLE t ATTACH PARTITION tuple()"
    )

    for node in [node1, node2]:
        node.query("SYSTEM SYNC REPLICA t")
        part_reattach_uuid = uuid.UUID(
            node.query(
                "SELECT uuid FROM system.parts WHERE table = 't' AND active ORDER BY name"
            ).strip()
        )
        assert part_initial_uuid == part_reattach_uuid

    # Test mutation assigns new non-zero uuids.
    node1.query(
        "ALTER TABLE t UPDATE value = 1 WHERE key = 1 SETTINGS mutations_sync = 2"
    )
    part_mutate_uuid = uuid.UUID(
        node1.query(
            "SELECT uuid FROM system.parts WHERE table = 't' AND active ORDER BY name"
        ).strip()
    )
    assert part_mutate_uuid not in [uuid_zero, part_initial_uuid]

    node2.query("SYSTEM SYNC REPLICA t")
    assert part_mutate_uuid == uuid.UUID(
        node2.query(
            "SELECT uuid FROM system.parts WHERE table = 't' AND active ORDER BY name"
        ).strip()
    )

    # Test merge assigns new non-zero uuids.
    node2.query("INSERT INTO t VALUES (1, 1)")
    node2.query("OPTIMIZE TABLE t FINAL")

    uuids = set()
    for node in [node1, node2]:
        node.query("SYSTEM SYNC REPLICA t")
        part_merge_uuid = uuid.UUID(
            node.query(
                "SELECT uuid FROM system.parts WHERE table = 't' AND active ORDER BY name"
            ).strip()
        )
        uuids.add(part_merge_uuid)
        assert part_mutate_uuid not in [uuid_zero, part_merge_uuid]
    assert len(uuids) == 1, "expect the same uuid on all the replicas"