/**
 *    Copyright (C) 2021-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kResharding

#include "mongo/db/s/resharding/resharding_recipient_service_external_state.h"

#include "mongo/db/s/resharding/resharding_donor_recipient_common.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/grid.h"
#include "mongo/s/resharding/common_types_gen.h"
#include "mongo/s/stale_shard_version_helpers.h"

namespace mongo {

namespace {
const WriteConcernOptions kMajorityWriteConcern{
    WriteConcernOptions::kMajority, WriteConcernOptions::SyncMode::UNSET, Seconds(0)};
}

void ReshardingRecipientService::RecipientStateMachineExternalState::
    ensureTempReshardingCollectionExistsWithIndexes(OperationContext* opCtx,
                                                    const CommonReshardingMetadata& metadata,
                                                    Timestamp cloneTimestamp) {
    LOGV2_DEBUG(5002300,
                1,
                "Creating temporary resharding collection",
                "sourceNamespace"_attr = metadata.getSourceNss());

    // The CatalogCache may have a collection entry from before the source collection was sharded.
    // We force a refresh to have this shard realize the collection is now sharded.
    refreshCatalogCache(opCtx, metadata.getSourceNss());

    auto [collOptions, unusedUUID] = getCollectionOptions(
        opCtx,
        metadata.getSourceNss(),
        metadata.getSourceUUID(),
        cloneTimestamp,
        "loading collection options to create temporary resharding collection"_sd);

    auto [indexes, idIndex] =
        getCollectionIndexes(opCtx,
                             metadata.getSourceNss(),
                             metadata.getSourceUUID(),
                             cloneTimestamp,
                             "loading indexes to create temporary resharding collection"_sd);

    // Set the temporary resharding collection's UUID to the resharding UUID. Note that
    // BSONObj::addFields() replaces any fields that already exist.
    collOptions = collOptions.addFields(BSON("uuid" << metadata.getReshardingUUID()));
    MigrationDestinationManager::cloneCollectionIndexesAndOptions(
        opCtx,
        metadata.getTempReshardingNss(),
        CollectionOptionsAndIndexes{metadata.getReshardingUUID(),
                                    std::move(indexes),
                                    std::move(idIndex),
                                    std::move(collOptions)});

    AutoGetCollection autoColl(opCtx, metadata.getTempReshardingNss(), MODE_IX);
    CollectionShardingRuntime::get(opCtx, metadata.getTempReshardingNss())
        ->clearFilteringMetadata(opCtx);
}

template <typename Callable>
auto RecipientStateMachineExternalStateImpl::_withShardVersionRetry(OperationContext* opCtx,
                                                                    const NamespaceString& nss,
                                                                    StringData reason,
                                                                    Callable&& callable) {
    auto catalogCache = Grid::get(opCtx)->catalogCache();
    return shardVersionRetry(opCtx, catalogCache, nss, reason, std::move(callable));
}

ShardId RecipientStateMachineExternalStateImpl::myShardId(ServiceContext* serviceContext) const {
    return ShardingState::get(serviceContext)->shardId();
}

void RecipientStateMachineExternalStateImpl::refreshCatalogCache(OperationContext* opCtx,
                                                                 const NamespaceString& nss) {
    auto catalogCache = Grid::get(opCtx)->catalogCache();
    uassertStatusOK(catalogCache->getShardedCollectionRoutingInfoWithRefresh(opCtx, nss));
}

ChunkManager RecipientStateMachineExternalStateImpl::getShardedCollectionRoutingInfo(
    OperationContext* opCtx, const NamespaceString& nss) {
    auto catalogCache = Grid::get(opCtx)->catalogCache();
    return catalogCache->getShardedCollectionRoutingInfo(opCtx, nss);
}

MigrationDestinationManager::CollectionOptionsAndUUID
RecipientStateMachineExternalStateImpl::getCollectionOptions(OperationContext* opCtx,
                                                             const NamespaceString& nss,
                                                             const UUID& uuid,
                                                             Timestamp afterClusterTime,
                                                             StringData reason) {
    // Load the collection options from the primary shard for the database.
    return _withShardVersionRetry(opCtx, nss, reason, [&] {
        return MigrationDestinationManager::getCollectionOptions(
            opCtx, NamespaceStringOrUUID{nss.db().toString(), uuid}, afterClusterTime);
    });
}

MigrationDestinationManager::IndexesAndIdIndex
RecipientStateMachineExternalStateImpl::getCollectionIndexes(OperationContext* opCtx,
                                                             const NamespaceString& nss,
                                                             const UUID& uuid,
                                                             Timestamp afterClusterTime,
                                                             StringData reason) {
    // Load the list of indexes from the shard which owns the global minimum chunk.
    return _withShardVersionRetry(opCtx, nss, reason, [&] {
        auto cm = getShardedCollectionRoutingInfo(opCtx, nss);
        return MigrationDestinationManager::getCollectionIndexes(
            opCtx,
            NamespaceStringOrUUID{nss.db().toString(), uuid},
            cm.getMinKeyShardIdWithSimpleCollation(),
            cm,
            afterClusterTime);
    });
}

void RecipientStateMachineExternalStateImpl::withShardVersionRetry(
    OperationContext* opCtx,
    const NamespaceString& nss,
    StringData reason,
    unique_function<void()> callback) {
    _withShardVersionRetry(opCtx, nss, reason, std::move(callback));
}

void RecipientStateMachineExternalStateImpl::updateCoordinatorDocument(OperationContext* opCtx,
                                                                       const BSONObj& query,
                                                                       const BSONObj& update) {
    auto catalogClient = Grid::get(opCtx)->catalogClient();
    auto docWasModified = uassertStatusOK(
        catalogClient->updateConfigDocument(opCtx,
                                            NamespaceString::kConfigReshardingOperationsNamespace,
                                            query,
                                            update,
                                            false, /* upsert */
                                            kMajorityWriteConcern,
                                            Milliseconds::max()));

    if (!docWasModified) {
        LOGV2_DEBUG(
            5543401,
            1,
            "Resharding coordinator document was not modified by the recipient's update; this is "
            "expected when the update had previously been interrupted due to a stepdown",
            "query"_attr = query,
            "update"_attr = update);
    }
}

void RecipientStateMachineExternalStateImpl::clearFilteringMetadata(OperationContext* opCtx) {
    resharding::clearFilteringMetadata(opCtx, true /* scheduleAsyncRefresh */);
}

}  // namespace mongo