#
# Copyright (C) 2024-present ScyllaDB
#
# SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
#
import asyncio
import logging

import pytest
from cassandra.protocol import InvalidRequest

from test.pylib.manager_client import ManagerClient
from test.pylib.rest_client import inject_error_one_shot
from test.cluster.util import disable_schema_agreement_wait, parse_replication_options, create_new_test_keyspace, \
    new_test_keyspace, get_replication

logger = logging.getLogger(__name__)


@pytest.mark.asyncio
@pytest.mark.skip_mode(mode='release', reason='error injections are not supported in release mode')
async def test_alter_dropped_tablets_keyspace(manager: ManagerClient) -> None:
    config = {
        'tablets_mode_for_new_keyspaces': 'enabled'
    }

    logger.info("starting a node (the leader)")
    servers = [await manager.server_add(config=config)]

    logger.info("starting a second node (the follower)")
    servers += [await manager.server_add(config=config)]

    ks = await create_new_test_keyspace(manager.get_cql(), "with "
                                      "replication = {'class': 'NetworkTopologyStrategy', 'replication_factor': 1} and "
                                      "tablets = {'enabled': true}")
    await manager.get_cql().run_async(f"create table {ks}.t (pk int primary key)")

    logger.info(f"injecting wait-after-topology-coordinator-gets-event into the leader node {servers[0]}")
    injection_handler = await inject_error_one_shot(manager.api, servers[0].ip_addr,
                                                    'wait-after-topology-coordinator-gets-event')

    async def alter_tablets_ks_without_waiting_to_complete():
        res = await manager.get_cql().run_async("select data_center from system.local")
        # ALTER tablets KS only accepts a specific DC, it rejects the generic 'replication_factor' tag
        this_dc = res[0].data_center
        await manager.get_cql().run_async(f"alter keyspace {ks} "
                                    f"with replication = {{'class': 'NetworkTopologyStrategy', '{this_dc}': 1}}")

    # by creating a task this way we ensure it's immediately executed, but we won't wait until it's completed
    task = asyncio.create_task(alter_tablets_ks_without_waiting_to_complete())

    logger.info(f"waiting for the leader node {servers[0]} to start handling the keyspace-rf-change request")
    leader_log_file = await manager.server_open_log(servers[0].server_id)
    await leader_log_file.wait_for("wait-after-topology-coordinator-gets-event: waiting", timeout=10)

    logger.info(f"dropping KS from the follower node {servers[1]} so that the leader, which hangs on injected sleep, "
                f"wakes up with the drop applied")
    host = manager.get_cql().cluster.metadata.get_host(servers[1].ip_addr)
    await manager.get_cql().run_async(f"drop keyspace {ks}", host=host)

    logger.info("Waking up the leader to continue processing ALTER with KS that doesn't exist (has been just dropped)")
    await injection_handler.message()

    matches = await leader_log_file.grep("topology change coordinator fiber got error "
                                         fr"data_dictionary::no_such_keyspace \(Can't find a keyspace {ks}\)")
    assert not matches

    with pytest.raises(InvalidRequest, match=f"Can't ALTER keyspace {ks}, keyspace doesn't exist|Can't find a keyspace {ks}") as e:
        await task

@pytest.mark.asyncio
@pytest.mark.skip_mode(mode='release', reason='error injections are not supported in release mode')
async def test_alter_tablets_keyspace_concurrent_modification(manager: ManagerClient) -> None:
    config = {
        'tablets_mode_for_new_keyspaces': 'enabled'
    }

    logger.info("starting a node (the leader)")
    this_dc = "dc1"
    servers = [await manager.server_add(config=config, property_file={"dc": this_dc, "rack": "r1"})]

    logger.info("starting a second node (the follower)")
    servers += [await manager.server_add(config=config, property_file={"dc": this_dc, "rack": "r2"})]

    async with new_test_keyspace(manager, "with replication = {'class': 'NetworkTopologyStrategy', "
                                          f"'{this_dc}': ['r1']"
                                          "} and tablets = {'initial': 2}") as ks:
        await manager.get_cql().run_async(f"create table {ks}.t (pk int primary key)")

        logger.info(f"injecting wait-before-committing-rf-change-event into the leader node {servers[0]}")
        injection_handler = await inject_error_one_shot(manager.api, servers[0].ip_addr,
                                                        'wait-before-committing-rf-change-event')

        async def alter_tablets_ks_without_waiting_to_complete():
            logger.info("scheduling ALTER KS to change the RF from 1 to 2")
            await manager.get_cql().run_async(f"alter keyspace {ks} "
                                            f"with replication = {{'class': 'NetworkTopologyStrategy', '{this_dc}': ['r1','r2']}}")

        # by creating a task this way we ensure it's immediately executed,
        # but we don't want to wait until the task is completed here,
        # because we want to do something else in the meantime
        task = asyncio.create_task(alter_tablets_ks_without_waiting_to_complete())

        logger.info(f"waiting for the leader node {servers[0]} to start handling the keyspace-rf-change request")
        leader_log_file = await manager.server_open_log(servers[0].server_id)
        await leader_log_file.wait_for("wait-before-committing-rf-change-event: waiting", timeout=10)

        logger.info(f"creating another keyspace from the follower node {servers[1]} so that the leader, which hangs on injected sleep, "
                    f"wakes up with a changed schema")
        host = manager.get_cql().cluster.metadata.get_host(servers[1].ip_addr)
        with disable_schema_agreement_wait(manager.get_cql()):
            ks2 = await create_new_test_keyspace(manager.get_cql(), "with "
                                            "replication = {'class': 'NetworkTopologyStrategy', 'replication_factor': 1} "
                                            "and tablets = {'enabled': true}", host=host)

        logger.info("waking up the leader to continue processing ALTER on a changed schema, which should cause a retry")
        await injection_handler.message()

        logger.info("waiting for ALTER to complete")
        await task

        # ensure that the concurrent modification error really did take place
        matches = await leader_log_file.grep("topology change coordinator fiber got group0_concurrent_modification")
        assert matches

        # ensure that the ALTER has eventually succeeded and we changed RF from 1 to 2
        assert get_replication(manager.get_cql(), ks)[this_dc] == ['r1', 'r2']

        await manager.get_cql().run_async(f"drop keyspace {ks2}")
