import os.path

import pytest
import logging
from helpers.cluster import ClickHouseCluster
from helpers.test_tools import TSV

cluster = ClickHouseCluster(__file__)
instance = cluster.add_instance('node')
path_to_data = '/var/lib/clickhouse/'


@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()
        instance.query('CREATE DATABASE test ENGINE = Ordinary')     # Different path in shadow/ with Atomic
        instance.query("DROP TABLE IF EXISTS test.tbl")
        instance.query("CREATE TABLE test.tbl (p Date, k Int8) ENGINE = MergeTree PARTITION BY toYYYYMM(p) ORDER BY p")
        for i in range(1, 4):
            instance.query('INSERT INTO test.tbl (p, k) VALUES(toDate({}), {})'.format(i, i))
        for i in range(31, 34):
            instance.query('INSERT INTO test.tbl (p, k) VALUES(toDate({}), {})'.format(i, i))

        expected = TSV('1970-01-02\t1\n1970-01-03\t2\n1970-01-04\t3\n1970-02-01\t31\n1970-02-02\t32\n1970-02-03\t33')
        res = instance.query("SELECT * FROM test.tbl ORDER BY p")
        assert (TSV(res) == expected)

        instance.query("ALTER TABLE test.tbl FREEZE")

        yield cluster

    finally:
        cluster.shutdown()


def copy_backup_to_detached(instance, database, src_table, dst_table):
    fp_increment = os.path.join(path_to_data, 'shadow/increment.txt')
    increment = instance.exec_in_container(['cat',  fp_increment]).strip()
    fp_backup = os.path.join(path_to_data, 'shadow', increment, 'data', database, src_table)
    fp_detached = os.path.join(path_to_data, 'data', database, dst_table, 'detached')
    logging.debug(f'copy from {fp_backup} to {fp_detached}. increment {fp_increment}')
    instance.exec_in_container(['cp', '-r', f'{fp_backup}', '-T' , f'{fp_detached}'])

def test_restore(started_cluster):
    instance.query("CREATE TABLE test.tbl1 AS test.tbl")

    copy_backup_to_detached(started_cluster.instances['node'], 'test', 'tbl', 'tbl1')

    # The data_version of parts to be attached are larger than the newly created table's data_version.
    instance.query("ALTER TABLE test.tbl1 ATTACH PARTITION 197001")
    instance.query("ALTER TABLE test.tbl1 ATTACH PARTITION 197002")
    instance.query("SELECT sleep(2)")

    # Validate the attached parts are identical to the backup.
    expected = TSV('1970-01-02\t1\n1970-01-03\t2\n1970-01-04\t3\n1970-02-01\t31\n1970-02-02\t32\n1970-02-03\t33')
    res = instance.query("SELECT * FROM test.tbl1 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("ALTER TABLE test.tbl1 UPDATE k=10 WHERE 1")
    instance.query("SELECT sleep(2)")

    # Validate mutation has been applied to all attached parts.
    expected = TSV('1970-01-02\t10\n1970-01-03\t10\n1970-01-04\t10\n1970-02-01\t10\n1970-02-02\t10\n1970-02-03\t10')
    res = instance.query("SELECT * FROM test.tbl1 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("DROP TABLE IF EXISTS test.tbl1")


def test_attach_partition(started_cluster):
    instance.query("CREATE TABLE test.tbl2 AS test.tbl")
    for i in range(3, 5):
        instance.query('INSERT INTO test.tbl2(p, k) VALUES(toDate({}), {})'.format(i, i))
    for i in range(33, 35):
        instance.query('INSERT INTO test.tbl2(p, k) VALUES(toDate({}), {})'.format(i, i))

    expected = TSV('1970-01-04\t3\n1970-01-05\t4\n1970-02-03\t33\n1970-02-04\t34')
    res = instance.query("SELECT * FROM test.tbl2 ORDER BY p")
    assert (TSV(res) == expected)

    copy_backup_to_detached(started_cluster.instances['node'], 'test', 'tbl', 'tbl2')

    # The data_version of parts to be attached
    # - may be less than, equal to or larger than the current table's data_version.
    # - may intersect with the existing parts of a partition.
    instance.query("ALTER TABLE test.tbl2 ATTACH PARTITION 197001")
    instance.query("ALTER TABLE test.tbl2 ATTACH PARTITION 197002")
    instance.query("SELECT sleep(2)")

    expected = TSV(
        '1970-01-02\t1\n1970-01-03\t2\n1970-01-04\t3\n1970-01-04\t3\n1970-01-05\t4\n1970-02-01\t31\n1970-02-02\t32\n1970-02-03\t33\n1970-02-03\t33\n1970-02-04\t34')
    res = instance.query("SELECT * FROM test.tbl2 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("ALTER TABLE test.tbl2 UPDATE k=10 WHERE 1")
    instance.query("SELECT sleep(2)")

    # Validate mutation has been applied to all attached parts.
    expected = TSV(
        '1970-01-02\t10\n1970-01-03\t10\n1970-01-04\t10\n1970-01-04\t10\n1970-01-05\t10\n1970-02-01\t10\n1970-02-02\t10\n1970-02-03\t10\n1970-02-03\t10\n1970-02-04\t10')
    res = instance.query("SELECT * FROM test.tbl2 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("DROP TABLE IF EXISTS test.tbl2")


def test_replace_partition(started_cluster):
    instance.query("CREATE TABLE test.tbl3 AS test.tbl")
    for i in range(3, 5):
        instance.query('INSERT INTO test.tbl3(p, k) VALUES(toDate({}), {})'.format(i, i))
    for i in range(33, 35):
        instance.query('INSERT INTO test.tbl3(p, k) VALUES(toDate({}), {})'.format(i, i))

    expected = TSV('1970-01-04\t3\n1970-01-05\t4\n1970-02-03\t33\n1970-02-04\t34')
    res = instance.query("SELECT * FROM test.tbl3 ORDER BY p")
    assert (TSV(res) == expected)

    copy_backup_to_detached(started_cluster.instances['node'], 'test', 'tbl', 'tbl3')

    # The data_version of parts to be copied
    # - may be less than, equal to or larger than the current table data_version.
    # - may intersect with the existing parts of a partition.
    instance.query("ALTER TABLE test.tbl3 REPLACE PARTITION 197002 FROM test.tbl")
    instance.query("SELECT sleep(2)")

    expected = TSV('1970-01-04\t3\n1970-01-05\t4\n1970-02-01\t31\n1970-02-02\t32\n1970-02-03\t33')
    res = instance.query("SELECT * FROM test.tbl3 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("ALTER TABLE test.tbl3 UPDATE k=10 WHERE 1")
    instance.query("SELECT sleep(2)")

    # Validate mutation has been applied to all copied parts.
    expected = TSV('1970-01-04\t10\n1970-01-05\t10\n1970-02-01\t10\n1970-02-02\t10\n1970-02-03\t10')
    res = instance.query("SELECT * FROM test.tbl3 ORDER BY p")
    assert (TSV(res) == expected)

    instance.query("DROP TABLE IF EXISTS test.tbl3")