import collections
import os
import re
import shutil
import time
import xml.etree.ElementTree as ET

import pytest

import helpers.client
import helpers.cluster


cluster = helpers.cluster.ClickHouseCluster(__file__)

node1 = cluster.add_instance('node1',
            main_configs=['configs/logs_config.xml'],
            with_zookeeper=True,
            stay_alive=True,
            tmpfs=['/jbod1:size=40M', '/jbod2:size=40M', '/jbod3:size=40M', '/jbod4:size=40M', '/external:size=200M'],
            macros={"shard": 0, "replica": 1} )

node2 = cluster.add_instance('node2',
            main_configs=['configs/logs_config.xml'],
            with_zookeeper=True,
            stay_alive=True,
            tmpfs=['/jbod1:size=40M', '/jbod2:size=40M', '/jbod3:size=40M', '/jbod4:size=40M', '/external:size=200M'],
            macros={"shard": 0, "replica": 2} )


def get_log(node):
    return node.exec_in_container(["bash", "-c", "cat /var/log/clickhouse-server/clickhouse-server.log"])


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

    finally:
        cluster.shutdown()


def start_over():
    shutil.copy(os.path.join(os.path.dirname(__file__), "configs/config.d/storage_configuration.xml"), os.path.join(node1.config_d_dir, "storage_configuration.xml"))

    for node in (node1, node2):
        separate_configuration_path = os.path.join(node.config_d_dir, "separate_configuration.xml")
        try:
            os.remove(separate_configuration_path)
        except:
            """"""


def add_disk(node, name, path, separate_file=False):
    separate_configuration_path = os.path.join(node.config_d_dir, "separate_configuration.xml")

    try:
        if separate_file:
            tree = ET.parse(separate_configuration_path)
        else:
            tree = ET.parse(os.path.join(node.config_d_dir, "storage_configuration.xml"))
    except:
        tree = ET.ElementTree(ET.fromstring('<yandex><storage_configuration><disks/><policies/></storage_configuration></yandex>'))
    root = tree.getroot()
    new_disk = ET.Element(name)
    new_path = ET.Element("path")
    new_path.text = path
    new_disk.append(new_path)
    root.find("storage_configuration").find("disks").append(new_disk)
    if separate_file:
        tree.write(separate_configuration_path)
    else:
        tree.write(os.path.join(node.config_d_dir, "storage_configuration.xml"))


def add_policy(node, name, volumes):
    tree = ET.parse(os.path.join(node.config_d_dir, "storage_configuration.xml"))
    root = tree.getroot()
    new_policy = ET.Element(name)
    new_volumes = ET.Element("volumes")
    for volume, disks in volumes.items():
        new_volume = ET.Element(volume)
        for disk in disks:
            new_disk = ET.Element("disk")
            new_disk.text = disk
            new_volume.append(new_disk)
        new_volumes.append(new_volume)
    new_policy.append(new_volumes)
    root.find("storage_configuration").find("policies").append(new_policy)
    tree.write(os.path.join(node.config_d_dir, "storage_configuration.xml"))


def test_add_disk(started_cluster):
    try:
        name = "test_add_disk"
        engine = "MergeTree()"

        start_over()
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        assert "jbod3" not in set(node1.query("SELECT name FROM system.disks").splitlines())

        add_disk(node1, "jbod3", "/jbod3/")
        node1.query("SYSTEM RELOAD CONFIG")

        assert "jbod3" in set(node1.query("SELECT name FROM system.disks").splitlines())
    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_add_disk_to_separate_config(started_cluster):
    try:
        name = "test_add_disk"
        engine = "MergeTree()"

        start_over()
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        assert "jbod3" not in set(node1.query("SELECT name FROM system.disks").splitlines())

        add_disk(node1, "jbod3", "/jbod3/", separate_file=True)
        node1.query("SYSTEM RELOAD CONFIG")

        assert "jbod3" in set(node1.query("SELECT name FROM system.disks").splitlines())
        start_over()

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_add_policy(started_cluster):
    try:
        name = "test_add_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        add_policy(node1, "cool_policy", {"volume1": ["jbod3", "jbod4"]})
        node1.query("SYSTEM RELOAD CONFIG")

        disks = set(node1.query("SELECT name FROM system.disks").splitlines())
        assert "cool_policy" in set(node1.query("SELECT policy_name FROM system.storage_policies").splitlines())
        assert {"volume1"} == set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())
        assert {"['jbod3','jbod4']"} == set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_new_policy_works(started_cluster):
    try:
        name = "test_new_policy_works"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        add_policy(node1, "cool_policy", {"volume1": ["jbod3"]})
        node1.query("SYSTEM RELOAD CONFIG")

        # Incompatible storage policy.
        with pytest.raises(helpers.client.QueryRuntimeException):
            node1.query("""
                ALTER TABLE {name} MODIFY SETTING storage_policy='cool_policy'
            """.format(name=name))

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", collections.OrderedDict([("volume1", ["jbod3"]), ("main", ["jbod1", "jbod2"]), ("external", ["external"])]))
        node1.query("SYSTEM RELOAD CONFIG")

        node1.query("""
            ALTER TABLE {name} MODIFY SETTING storage_policy='cool_policy'
        """.format(name=name))

        node1.query("""
            INSERT INTO TABLE {name} VALUES (1)
        """.format(name=name))
        assert {"jbod3"} == set(node1.query("SELECT disk_name FROM system.parts WHERE active = 1 AND table = '{name}'".format(name=name)).splitlines())

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_add_volume_to_policy(started_cluster):
    try:
        name = "test_add_volume_to_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", {"volume1": ["jbod3"]})
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", collections.OrderedDict([("volume1", ["jbod3"]), ("volume2", ["jbod4"])]))
        node1.query("SYSTEM RELOAD CONFIG")

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())
        assert {"volume1", "volume2"} == volumes
        assert {"['jbod3']", "['jbod4']"} == disks_sets

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_add_disk_to_policy(started_cluster):
    try:
        name = "test_add_disk_to_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", {"volume1": ["jbod3"]})
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", {"volume1": ["jbod3","jbod4"]})
        node1.query("SYSTEM RELOAD CONFIG")

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'cool_policy'").splitlines())
        assert {"volume1"} == volumes
        assert {"['jbod3','jbod4']"} == disks_sets

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_remove_disk(started_cluster):
    try:
        name = "test_remove_disk"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "remove_disk_jbod3", "/jbod3/")
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        assert "remove_disk_jbod3" in set(node1.query("SELECT name FROM system.disks").splitlines())

        start_over()
        node1.query("SYSTEM RELOAD CONFIG")

        assert "remove_disk_jbod3" in set(node1.query("SELECT name FROM system.disks").splitlines())
        assert re.search("Warning.*remove_disk_jbod3", get_log(node1))
    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_remove_policy(started_cluster):
    try:
        name = "test_remove_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "remove_policy_cool_policy", {"volume1": ["jbod3", "jbod4"]})
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        assert "remove_policy_cool_policy" in set(node1.query("SELECT policy_name FROM system.storage_policies").splitlines())

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        node1.query("SYSTEM RELOAD CONFIG")

        assert "remove_policy_cool_policy" in set(node1.query("SELECT policy_name FROM system.storage_policies").splitlines())
        assert re.search("Error.*remove_policy_cool_policy", get_log(node1))

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_remove_volume_from_policy(started_cluster):
    try:
        name = "test_remove_volume_from_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "test_remove_volume_from_policy_cool_policy", collections.OrderedDict([("volume1", ["jbod3"]), ("volume2", ["jbod4"])]))
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'test_remove_volume_from_policy_cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'test_remove_volume_from_policy_cool_policy'").splitlines())
        assert {"volume1", "volume2"} == volumes
        assert {"['jbod3']", "['jbod4']"} == disks_sets

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", {"volume1": ["jbod3"]})
        node1.query("SYSTEM RELOAD CONFIG")

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'test_remove_volume_from_policy_cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'test_remove_volume_from_policy_cool_policy'").splitlines())
        assert {"volume1", "volume2"} == volumes
        assert {"['jbod3']", "['jbod4']"} == disks_sets
        assert re.search("Error.*test_remove_volume_from_policy_cool_policy", get_log(node1))

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""


def test_remove_disk_from_policy(started_cluster):
    try:
        name = "test_remove_disk_from_policy"
        engine = "MergeTree()"

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "test_remove_disk_from_policy_cool_policy", {"volume1": ["jbod3","jbod4"]})
        node1.restart_clickhouse(kill=True)
        time.sleep(2)

        node1.query("""
            CREATE TABLE {name} (
                d UInt64
            ) ENGINE = {engine}
            ORDER BY d
            SETTINGS storage_policy='jbods_with_external'
        """.format(name=name, engine=engine))

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'test_remove_disk_from_policy_cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'test_remove_disk_from_policy_cool_policy'").splitlines())
        assert {"volume1"} == volumes
        assert {"['jbod3','jbod4']"} == disks_sets

        start_over()
        add_disk(node1, "jbod3", "/jbod3/")
        add_disk(node1, "jbod4", "/jbod4/")
        add_policy(node1, "cool_policy", {"volume1": ["jbod3"]})
        node1.query("SYSTEM RELOAD CONFIG")

        volumes = set(node1.query("SELECT volume_name FROM system.storage_policies WHERE policy_name = 'test_remove_disk_from_policy_cool_policy'").splitlines())
        disks_sets = set(node1.query("SELECT disks FROM system.storage_policies WHERE policy_name = 'test_remove_disk_from_policy_cool_policy'").splitlines())
        assert {"volume1"} == volumes
        assert {"['jbod3','jbod4']"} == disks_sets
        assert re.search("Error.*test_remove_disk_from_policy_cool_policy", get_log(node1))

    finally:
        try:
            node1.query("DROP TABLE IF EXISTS {}".format(name))
        except:
            """"""