import logging
import os
import os.path as p
import time

import pytest

from helpers.cluster import ClickHouseCluster, run_and_check

cluster = ClickHouseCluster(__file__)

instance = cluster.add_instance(
    "instance",
    dictionaries=["configs/dictionaries/dict1.xml"],
    main_configs=["configs/config.d/config.xml"],
    stay_alive=True,
    # WA for the problem with zombie processes inside the docker container.
    # This is important here because we are checking that there are no zombie processes
    # after craches inside the library bridge.
    # https://forums.docker.com/t/what-the-latest-with-the-zombie-process-reaping-problem/50758/2
    use_docker_init_flag=True,
)


def create_dict_simple(ch_instance):
    ch_instance.query("DROP DICTIONARY IF EXISTS lib_dict_c")
    ch_instance.query(
        """
        CREATE DICTIONARY lib_dict_c (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key SOURCE(library(PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so'))
        LAYOUT(CACHE(
        SIZE_IN_CELLS 10000000
        BLOCK_SIZE 4096
        FILE_SIZE 16777216
        READ_BUFFER_SIZE 1048576
        MAX_STORED_KEYS 1048576))
        LIFETIME(2) ;
    """
    )


def check_no_zombie_processes(instance):
    res = instance.exec_in_container(
        ["bash", "-c", "ps ax -ostat,pid | grep -e '[zZ]' | wc -l"], user="root"
    )
    assert res == "0\n"


@pytest.fixture(scope="module")
def ch_cluster():
    try:
        cluster.start()
        instance.query("CREATE DATABASE test")
        container_lib_path = (
            "/etc/clickhouse-server/config.d/dictionarites_lib/dict_lib.cpp"
        )

        instance.copy_file_to_container(
            os.path.join(
                os.path.dirname(os.path.realpath(__file__)), "configs/dict_lib.cpp"
            ),
            "/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.cpp",
        )

        instance.query("SYSTEM RELOAD CONFIG")

        instance.exec_in_container(
            [
                "bash",
                "-c",
                "/usr/bin/g++ -shared -o /etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so -fPIC /etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.cpp",
            ],
            user="root",
        )

        instance.exec_in_container(
            [
                "bash",
                "-c",
                "/usr/bin/g++ -shared -o /dict_lib_copy.so -fPIC /etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.cpp",
            ],
            user="root",
        )
        instance.exec_in_container(
            [
                "bash",
                "-c",
                "ln -s /dict_lib_copy.so /etc/clickhouse-server/config.d/dictionaries_lib/dict_lib_symlink.so",
            ]
        )

        yield cluster

    finally:
        cluster.shutdown()


@pytest.fixture(autouse=True)
def setup_teardown():
    yield  # run test


def test_load_all(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    instance.query("DROP DICTIONARY IF EXISTS lib_dict")
    instance.query(
        """
        CREATE DICTIONARY lib_dict (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key
        SOURCE(library(
            PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so'
            SETTINGS (test_type test_simple)))
        LAYOUT(HASHED())
        LIFETIME (MIN 0 MAX 10)
    """
    )

    result = instance.query("SELECT * FROM lib_dict ORDER BY key")
    expected = (
        "0\t10\t20\t30\n"
        + "1\t11\t21\t31\n"
        + "2\t12\t22\t32\n"
        + "3\t13\t23\t33\n"
        + "4\t14\t24\t34\n"
        + "5\t15\t25\t35\n"
        + "6\t16\t26\t36\n"
        + "7\t17\t27\t37\n"
        + "8\t18\t28\t38\n"
        + "9\t19\t29\t39\n"
    )
    instance.query("SYSTEM RELOAD DICTIONARY dict1")
    instance.query("DROP DICTIONARY lib_dict")
    assert result == expected

    instance.query(
        """
        CREATE TABLE IF NOT EXISTS `dict1_table` (
             key UInt64, value1 UInt64, value2 UInt64, value3 UInt64
        ) ENGINE = Dictionary(dict1)
        """
    )

    result = instance.query("SELECT * FROM dict1_table ORDER BY key")
    assert result == expected


def test_load_ids(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    instance.query("DROP DICTIONARY IF EXISTS lib_dict_c")
    instance.query(
        """
        CREATE DICTIONARY lib_dict_c (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key SOURCE(library(PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so'))
        LAYOUT(CACHE(
        SIZE_IN_CELLS 10000000
        BLOCK_SIZE 4096
        FILE_SIZE 16777216
        READ_BUFFER_SIZE 1048576
        MAX_STORED_KEYS 1048576))
        LIFETIME(2) ;
    """
    )

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(0));""")
    assert result.strip() == "100"

    # Just check bridge is ok with a large vector of random ids
    instance.query(
        """select number, dictGet(lib_dict_c, 'value1', toUInt64(rand())) from numbers(1000);"""
    )

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"
    instance.query("DROP DICTIONARY lib_dict_c")


def test_load_keys(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    instance.query("DROP DICTIONARY IF EXISTS lib_dict_ckc")
    instance.query(
        """
        CREATE DICTIONARY lib_dict_ckc (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key
        SOURCE(library(PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so'))
        LAYOUT(COMPLEX_KEY_CACHE( SIZE_IN_CELLS 10000000))
        LIFETIME(2);
    """
    )

    result = instance.query(
        """select dictGet(lib_dict_ckc, 'value1', tuple(toUInt64(0)));"""
    )
    assert result.strip() == "100"
    result = instance.query(
        """select dictGet(lib_dict_ckc, 'value2', tuple(toUInt64(0)));"""
    )
    assert result.strip() == "200"
    instance.query("DROP DICTIONARY lib_dict_ckc")


def test_load_all_many_rows(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    num_rows = [1000, 10000, 100000, 1000000]
    instance.query("DROP DICTIONARY IF EXISTS lib_dict")
    for num in num_rows:
        instance.query(
            """
            CREATE DICTIONARY lib_dict (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
            PRIMARY KEY key
            SOURCE(library(
                PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib.so'
                SETTINGS (num_rows {} test_type test_many_rows)))
            LAYOUT(HASHED())
            LIFETIME (MIN 0 MAX 10)
        """.format(
                num
            )
        )

        result = instance.query("SELECT * FROM lib_dict ORDER BY key")
        expected = instance.query(
            "SELECT number, number, number, number FROM numbers({})".format(num)
        )
        instance.query("DROP DICTIONARY lib_dict")
        assert result == expected


def test_null_values(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    instance.query("SYSTEM RELOAD DICTIONARY dict2")
    instance.query(
        """
        CREATE TABLE IF NOT EXISTS `dict2_table` (
             key UInt64, value1 UInt64, value2 UInt64, value3 UInt64
        ) ENGINE = Dictionary(dict2)
        """
    )

    result = instance.query("SELECT * FROM dict2_table ORDER BY key")
    expected = "0\t12\t12\t12\n"
    assert result == expected


def test_recover_after_bridge_crash(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    create_dict_simple(instance)

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(0));""")
    assert result.strip() == "100"
    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    instance.exec_in_container(
        ["bash", "-c", "kill -9 `pidof clickhouse-library-bridge`"], user="root"
    )
    instance.query("SYSTEM RELOAD DICTIONARY lib_dict_c")

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(0));""")
    assert result.strip() == "100"
    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    instance.exec_in_container(
        ["bash", "-c", "kill -9 `pidof clickhouse-library-bridge`"], user="root"
    )

    check_no_zombie_processes(instance)
    instance.query("DROP DICTIONARY lib_dict_c")


def test_server_restart_bridge_might_be_stil_alive(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    create_dict_simple(instance)

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    instance.restart_clickhouse()

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    instance.exec_in_container(
        ["bash", "-c", "kill -9 `pidof clickhouse-library-bridge`"], user="root"
    )
    instance.restart_clickhouse()

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    check_no_zombie_processes(instance)

    instance.query("DROP DICTIONARY lib_dict_c")


def test_path_validation(ch_cluster):
    if instance.is_built_with_memory_sanitizer():
        pytest.skip("Memory Sanitizer cannot work with third-party shared libraries")

    instance.query("DROP DICTIONARY IF EXISTS lib_dict_c")
    instance.query(
        """
        CREATE DICTIONARY lib_dict_c (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key SOURCE(library(PATH '/etc/clickhouse-server/config.d/dictionaries_lib/dict_lib_symlink.so'))
        LAYOUT(CACHE(
        SIZE_IN_CELLS 10000000
        BLOCK_SIZE 4096
        FILE_SIZE 16777216
        READ_BUFFER_SIZE 1048576
        MAX_STORED_KEYS 1048576))
        LIFETIME(2) ;
    """
    )

    result = instance.query("""select dictGet(lib_dict_c, 'value1', toUInt64(1));""")
    assert result.strip() == "101"

    instance.query("DROP DICTIONARY IF EXISTS lib_dict_c")
    instance.query(
        """
        CREATE DICTIONARY lib_dict_c (key UInt64, value1 UInt64, value2 UInt64, value3 UInt64)
        PRIMARY KEY key SOURCE(library(PATH '/etc/clickhouse-server/config.d/dictionaries_lib/../../../../dict_lib_copy.so'))
        LAYOUT(CACHE(
        SIZE_IN_CELLS 10000000
        BLOCK_SIZE 4096
        FILE_SIZE 16777216
        READ_BUFFER_SIZE 1048576
        MAX_STORED_KEYS 1048576))
        LIFETIME(2) ;
    """
    )
    result = instance.query_and_get_error(
        """select dictGet(lib_dict_c, 'value1', toUInt64(1));"""
    )
    assert (
        "DB::Exception: File path /etc/clickhouse-server/config.d/dictionaries_lib/../../../../dict_lib_copy.so is not inside /etc/clickhouse-server/config.d/dictionaries_lib"
        in result
    )


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