/**
 *    Copyright (C) 2019-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.
 */

#include "mongo/platform/basic.h"

#include "mongo/db/commands/internal_rename_if_options_and_indexes_match_gen.h"

#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/rename_collection.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/database_sharding_state.h"
#include "mongo/db/s/dist_lock_manager.h"

namespace mongo {
MONGO_FAIL_POINT_DEFINE(blockBeforeInternalRenameIfOptionsAndIndexesMatch);

namespace {

bool isCollectionSharded(OperationContext* opCtx, const NamespaceString& nss) {
    AutoGetCollectionForRead lock(opCtx, nss);
    return opCtx->writesAreReplicated() &&
        CollectionShardingState::get(opCtx, nss)->getCollectionDescription(opCtx).isSharded();
}

}  // namespace

/**
 * Rename a collection while checking collection option and indexes.
 */
class InternalRenameIfOptionsAndIndexesMatchCmd final
    : public TypedCommand<InternalRenameIfOptionsAndIndexesMatchCmd> {
public:
    using Request = InternalRenameIfOptionsAndIndexesMatch;

    class Invocation final : public InvocationBase {
    public:
        using InvocationBase::InvocationBase;

        void typedRun(OperationContext* opCtx) {
            auto thisRequest = request();
            const auto& fromNss = thisRequest.getFrom();
            const auto& toNss = thisRequest.getTo();
            const auto& originalIndexes = thisRequest.getIndexes();
            const auto indexList =
                std::list<BSONObj>(originalIndexes.begin(), originalIndexes.end());
            const auto& collectionOptions = thisRequest.getCollectionOptions();

            if (serverGlobalParams.clusterRole != ClusterRole::ShardServer) {
                // No need to acquire additional locks in a non-sharded environment
                _internalRun(opCtx, fromNss, toNss, indexList, collectionOptions);
                return;
            }

            // Check if the receiving shard is still the primary for the database
            DatabaseShardingState::checkIsPrimaryShardForDb(opCtx, fromNss.db());

            // Acquiring the local part of the distributed locks for involved namespaces allows:
            // - Serialize with sharded DDLs, ensuring no concurrent modifications of the
            // collections.
            // - Check safely if the target collection is sharded or not.
            auto distLockManager = DistLockManager::get(opCtx);
            auto fromLocalDistlock = distLockManager->lockDirectLocally(
                opCtx, fromNss.ns(), DistLockManager::kDefaultLockTimeout);
            auto toLocalDistLock = distLockManager->lockDirectLocally(
                opCtx, toNss.ns(), DistLockManager::kDefaultLockTimeout);

            uassert(ErrorCodes::IllegalOperation,
                    str::stream() << "cannot rename to sharded collection '" << toNss << "'",
                    !isCollectionSharded(opCtx, toNss));

            _internalRun(opCtx, fromNss, toNss, indexList, collectionOptions);
        }

    private:
        static void _internalRun(OperationContext* opCtx,
                                 const NamespaceString& fromNss,
                                 const NamespaceString& toNss,
                                 const std::list<BSONObj>& indexList,
                                 const BSONObj& collectionOptions) {
            if (MONGO_unlikely(blockBeforeInternalRenameIfOptionsAndIndexesMatch.shouldFail())) {
                blockBeforeInternalRenameIfOptionsAndIndexesMatch.pauseWhileSet();
            }

            RenameCollectionOptions options;
            options.dropTarget = true;
            options.stayTemp = false;
            doLocalRenameIfOptionsAndIndexesHaveNotChanged(
                opCtx, fromNss, toNss, options, std::move(indexList), collectionOptions);
        }

        NamespaceString ns() const override {
            return request().getFrom();
        }
        bool supportsWriteConcern() const override {
            return true;
        }

        void doCheckAuthorization(OperationContext* opCtx) const override {
            auto thisRequest = request();
            auto from = thisRequest.getFrom();
            auto to = thisRequest.getTo();
            uassert(ErrorCodes::Unauthorized,
                    str::stream() << "Unauthorized to rename " << from,
                    AuthorizationSession::get(opCtx->getClient())
                        ->isAuthorizedForActionsOnResource(ResourcePattern::forExactNamespace(from),
                                                           ActionType::renameCollection));
            uassert(ErrorCodes::Unauthorized,
                    str::stream() << "Unauthorized to drop " << to,
                    AuthorizationSession::get(opCtx->getClient())
                        ->isAuthorizedForActionsOnResource(ResourcePattern::forExactNamespace(to),
                                                           ActionType::dropCollection));
            uassert(ErrorCodes::Unauthorized,
                    str::stream() << "Unauthorized to insert into " << to,
                    AuthorizationSession::get(opCtx->getClient())
                        ->isAuthorizedForActionsOnResource(ResourcePattern::forExactNamespace(to),
                                                           ActionType::insert));
        }
    };

    bool skipApiVersionCheck() const override {
        // Internal command (server to server).
        return true;
    }

    std::string help() const override {
        return "Internal command to rename and check collection options";
    }

    bool adminOnly() const override {
        return true;
    }

    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
        return AllowedOnSecondary::kNever;
    }

} internalRenameIfOptionsAndIndexesMatchCmd;
}  // namespace mongo