import logging
import random
import string
import time
import threading
import os

import pytest
from helpers.cluster import ClickHouseCluster, get_instances_dir


# By default the exceptions that was throwed in threads will be ignored
# (they will not mark the test as failed, only printed to stderr).
#
# Wrap thrading.Thread and re-throw exception on join()
class SafeThread(threading.Thread):
    def __init__(self, target):
        super().__init__()
        self.target = target
        self.exception = None
    def run(self):
        try:
            self.target()
        except Exception as e: # pylint: disable=broad-except
            self.exception = e
    def join(self, timeout=None):
        super().join(timeout)
        if self.exception:
            raise self.exception


SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
CONFIG_PATH = os.path.join(SCRIPT_DIR, './{}/node/configs/config.d/storage_conf.xml'.format(get_instances_dir()))


def replace_config(old, new):
    config = open(CONFIG_PATH, 'r')
    config_lines = config.readlines()
    config.close()
    config_lines = [line.replace(old, new) for line in config_lines]
    config = open(CONFIG_PATH, 'w')
    config.writelines(config_lines)
    config.close()


@pytest.fixture(scope="module")
def cluster():
    try:
        cluster = ClickHouseCluster(__file__)
        cluster.add_instance("node",
                             main_configs=["configs/config.d/storage_conf.xml",
                                           "configs/config.d/bg_processing_pool_conf.xml"],
                             with_minio=True)
        logging.info("Starting cluster...")
        cluster.start()
        logging.info("Cluster started")

        yield cluster
    finally:
        cluster.shutdown()


FILES_OVERHEAD = 1
FILES_OVERHEAD_PER_COLUMN = 2  # Data and mark files
FILES_OVERHEAD_PER_PART_WIDE = FILES_OVERHEAD_PER_COLUMN * 3 + 2 + 6 + 1
FILES_OVERHEAD_PER_PART_COMPACT = 10 + 1


def random_string(length):
    letters = string.ascii_letters
    return ''.join(random.choice(letters) for i in range(length))


def generate_values(date_str, count, sign=1):
    data = [[date_str, sign * (i + 1), random_string(10)] for i in range(count)]
    data.sort(key=lambda tup: tup[1])
    return ",".join(["('{}',{},'{}')".format(x, y, z) for x, y, z in data])


def create_table(cluster, table_name, additional_settings=None):
    node = cluster.instances["node"]

    create_table_statement = """
        CREATE TABLE {} (
            dt Date,
            id Int64,
            data String,
            INDEX min_max (id) TYPE minmax GRANULARITY 3
        ) ENGINE=MergeTree()
        PARTITION BY dt
        ORDER BY (dt, id)
        SETTINGS
            storage_policy='s3',
            old_parts_lifetime=0,
            index_granularity=512
        """.format(table_name)

    if additional_settings:
        create_table_statement += ","
        create_table_statement += additional_settings

    node.query(create_table_statement)


def wait_for_delete_s3_objects(cluster, expected, timeout=30):
    minio = cluster.minio_client
    while timeout > 0:
        if len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == expected:
            return
        timeout -= 1
        time.sleep(1)
    assert(len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == expected)


@pytest.fixture(autouse=True)
def drop_table(cluster):
    yield
    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("DROP TABLE IF EXISTS s3_test NO DELAY")

    try:
        wait_for_delete_s3_objects(cluster, 0)
    finally:
        # Remove extra objects to prevent tests cascade failing
        for obj in list(minio.list_objects(cluster.minio_bucket, 'data/')):
            minio.remove_object(cluster.minio_bucket, obj.object_name)


@pytest.mark.parametrize(
    "min_rows_for_wide_part,files_per_part",
    [
        (0, FILES_OVERHEAD_PER_PART_WIDE),
        (8192, FILES_OVERHEAD_PER_PART_COMPACT)
    ]
)
def test_simple_insert_select(cluster, min_rows_for_wide_part, files_per_part):
    create_table(cluster, "s3_test", additional_settings="min_rows_for_wide_part={}".format(min_rows_for_wide_part))

    node = cluster.instances["node"]
    minio = cluster.minio_client

    values1 = generate_values('2020-01-03', 4096)
    node.query("INSERT INTO s3_test VALUES {}".format(values1))
    assert node.query("SELECT * FROM s3_test order by dt, id FORMAT Values") == values1
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + files_per_part

    values2 = generate_values('2020-01-04', 4096)
    node.query("INSERT INTO s3_test VALUES {}".format(values2))
    assert node.query("SELECT * FROM s3_test ORDER BY dt, id FORMAT Values") == values1 + "," + values2
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + files_per_part * 2

    assert node.query("SELECT count(*) FROM s3_test where id = 1 FORMAT Values") == "(2)"


@pytest.mark.parametrize(
    "merge_vertical", [False, True]
)
def test_insert_same_partition_and_merge(cluster, merge_vertical):
    settings = None
    if merge_vertical:
        settings = """
            vertical_merge_algorithm_min_rows_to_activate=0,
            vertical_merge_algorithm_min_columns_to_activate=0
        """
    create_table(cluster, "s3_test", additional_settings=settings)

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("SYSTEM STOP MERGES s3_test")
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 1024)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 2048)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 1024, -1)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 2048, -1)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096, -1)))
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(distinct(id)) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD_PER_PART_WIDE * 6 + FILES_OVERHEAD

    node.query("SYSTEM START MERGES s3_test")

    # Wait for merges and old parts deletion
    for attempt in range(0, 10):
        parts_count = node.query("SELECT COUNT(*) FROM system.parts WHERE table = 's3_test' FORMAT Values")
        if parts_count == "(1)":
            break

        if attempt == 9:
            assert parts_count == "(1)"

        time.sleep(1)

    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(distinct(id)) FROM s3_test FORMAT Values") == "(8192)"
    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD_PER_PART_WIDE + FILES_OVERHEAD)


def test_alter_table_columns(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096, -1)))

    node.query("ALTER TABLE s3_test ADD COLUMN col1 UInt64 DEFAULT 1")
    # To ensure parts have merged
    node.query("OPTIMIZE TABLE s3_test")

    assert node.query("SELECT sum(col1) FROM s3_test FORMAT Values") == "(8192)"
    assert node.query("SELECT sum(col1) FROM s3_test WHERE id > 0 FORMAT Values") == "(4096)"
    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE + FILES_OVERHEAD_PER_COLUMN)

    node.query("ALTER TABLE s3_test MODIFY COLUMN col1 String", settings={"mutations_sync": 2})

    assert node.query("SELECT distinct(col1) FROM s3_test FORMAT Values") == "('1')"
    # and file with mutation
    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE + FILES_OVERHEAD_PER_COLUMN + 1)

    node.query("ALTER TABLE s3_test DROP COLUMN col1", settings={"mutations_sync": 2})

    # and 2 files with mutations
    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE + 2)


def test_attach_detach_partition(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096)))
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    node.query("ALTER TABLE s3_test DETACH PARTITION '2020-01-03'")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(4096)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    node.query("ALTER TABLE s3_test ATTACH PARTITION '2020-01-03'")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    node.query("ALTER TABLE s3_test DROP PARTITION '2020-01-03'")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(4096)"
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE

    node.query("ALTER TABLE s3_test DETACH PARTITION '2020-01-04'")
    node.query("ALTER TABLE s3_test DROP DETACHED PARTITION '2020-01-04'", settings={"allow_drop_detached": 1})
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(0)"
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD


def test_move_partition_to_another_disk(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096)))
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    node.query("ALTER TABLE s3_test MOVE PARTITION '2020-01-04' TO DISK 'hdd'")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE

    node.query("ALTER TABLE s3_test MOVE PARTITION '2020-01-04' TO DISK 's3'")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2


def test_table_manipulations(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096)))

    node.query("RENAME TABLE s3_test TO s3_renamed")
    assert node.query("SELECT count(*) FROM s3_renamed FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2
    node.query("RENAME TABLE s3_renamed TO s3_test")

    assert node.query("CHECK TABLE s3_test FORMAT Values") == "(1)"

    node.query("DETACH TABLE s3_test")
    node.query("ATTACH TABLE s3_test")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    node.query("TRUNCATE TABLE s3_test")
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(0)"
    assert len(list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD


def test_move_replace_partition_to_another_table(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-05', 4096, -1)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-06', 4096, -1)))
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(16384)"
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 4

    create_table(cluster, "s3_clone")

    node.query("ALTER TABLE s3_test MOVE PARTITION '2020-01-03' TO TABLE s3_clone")
    node.query("ALTER TABLE s3_test MOVE PARTITION '2020-01-05' TO TABLE s3_clone")
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(8192)"
    assert node.query("SELECT sum(id) FROM s3_clone FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_clone FORMAT Values") == "(8192)"
    # Number of objects in S3 should be unchanged.
    assert len(list(
        minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD * 2 + FILES_OVERHEAD_PER_PART_WIDE * 4

    # Add new partitions to source table, but with different values and replace them from copied table.
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096, -1)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-05', 4096)))
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(16384)"
    assert len(list(
        minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD * 2 + FILES_OVERHEAD_PER_PART_WIDE * 6

    node.query("ALTER TABLE s3_test REPLACE PARTITION '2020-01-03' FROM s3_clone")
    node.query("ALTER TABLE s3_test REPLACE PARTITION '2020-01-05' FROM s3_clone")
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(16384)"
    assert node.query("SELECT sum(id) FROM s3_clone FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_clone FORMAT Values") == "(8192)"

    # Wait for outdated partitions deletion.
    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD * 2 + FILES_OVERHEAD_PER_PART_WIDE * 4)

    node.query("DROP TABLE s3_clone NO DELAY")
    assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
    assert node.query("SELECT count(*) FROM s3_test FORMAT Values") == "(16384)"
    # Data should remain in S3
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 4

    node.query("ALTER TABLE s3_test FREEZE")
    # Number S3 objects should be unchanged.
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 4

    node.query("DROP TABLE s3_test NO DELAY")
    # Backup data should remain in S3.

    wait_for_delete_s3_objects(cluster, FILES_OVERHEAD_PER_PART_WIDE * 4)

    for obj in list(minio.list_objects(cluster.minio_bucket, 'data/')):
        minio.remove_object(cluster.minio_bucket, obj.object_name)


def test_freeze_unfreeze(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]
    minio = cluster.minio_client

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    node.query("ALTER TABLE s3_test FREEZE WITH NAME 'backup1'")
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096)))
    node.query("ALTER TABLE s3_test FREEZE WITH NAME 'backup2'")

    node.query("TRUNCATE TABLE s3_test")
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD + FILES_OVERHEAD_PER_PART_WIDE * 2

    # Unfreeze single partition from backup1.
    node.query("ALTER TABLE s3_test UNFREEZE PARTITION '2020-01-03' WITH NAME 'backup1'")
    # Unfreeze all partitions from backup2.
    node.query("ALTER TABLE s3_test UNFREEZE WITH NAME 'backup2'")

    # Data should be removed from S3.
    assert len(
        list(minio.list_objects(cluster.minio_bucket, 'data/'))) == FILES_OVERHEAD


def test_s3_disk_apply_new_settings(cluster):
    create_table(cluster, "s3_test")
    node = cluster.instances["node"]

    def get_s3_requests():
        node.query("SYSTEM FLUSH LOGS")
        return int(node.query("SELECT value FROM system.events WHERE event='S3WriteRequestsCount'"))

    s3_requests_before = get_s3_requests()
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-03', 4096)))
    s3_requests_to_write_partition = get_s3_requests() - s3_requests_before

    # Force multi-part upload mode.
    replace_config("<s3_max_single_part_upload_size>33554432</s3_max_single_part_upload_size>",
                   "<s3_max_single_part_upload_size>0</s3_max_single_part_upload_size>")

    node.query("SYSTEM RELOAD CONFIG")

    s3_requests_before = get_s3_requests()
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 4096, -1)))

    # There should be 3 times more S3 requests because multi-part upload mode uses 3 requests to upload object.
    assert get_s3_requests() - s3_requests_before == s3_requests_to_write_partition * 3


def test_s3_disk_restart_during_load(cluster):
    create_table(cluster, "s3_test")

    node = cluster.instances["node"]

    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-04', 1024 * 1024)))
    node.query("INSERT INTO s3_test VALUES {}".format(generate_values('2020-01-05', 1024 * 1024, -1)))

    def read():
        for ii in range(0, 20):
            logging.info("Executing %d query", ii)
            assert node.query("SELECT sum(id) FROM s3_test FORMAT Values") == "(0)"
            logging.info("Query %d executed", ii)
            time.sleep(0.2)

    def restart_disk():
        for iii in range(0, 5):
            logging.info("Restarting disk, attempt %d", iii)
            node.query("SYSTEM RESTART DISK s3")
            logging.info("Disk restarted, attempt %d", iii)
            time.sleep(0.5)

    threads = []
    for i in range(0, 4):
        threads.append(SafeThread(target=read))

    threads.append(SafeThread(target=restart_disk))

    for thread in threads:
        thread.start()

    for thread in threads:
        thread.join()