/**
 *    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.
 */


#include "mongo/platform/basic.h"

#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/commands.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/s/balancer/balancer.h"
#include "mongo/db/s/config/sharding_catalog_manager.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/s/shard_filtering_metadata_refresh.h"
#include "mongo/s/balancer_configuration.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/configure_collection_balancing_gen.h"

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding


namespace mongo {
namespace {

class ConfigsvrConfigureCollectionBalancingCmd final
    : public TypedCommand<ConfigsvrConfigureCollectionBalancingCmd> {
public:
    using Request = ConfigsvrConfigureCollectionBalancing;

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

        void typedRun(OperationContext* opCtx) {
            opCtx->setAlwaysInterruptAtStepDownOrUp();
            uassert(ErrorCodes::IllegalOperation,
                    str::stream() << Request::kCommandName << " can only be run on config servers",
                    serverGlobalParams.clusterRole == ClusterRole::ConfigServer);

            uassert(8423309,
                    str::stream() << Request::kCommandName << " command not supported",
                    mongo::feature_flags::gPerCollBalancingSettings.isEnabled(
                        serverGlobalParams.featureCompatibility));

            const NamespaceString& nss = ns();

            uassert(ErrorCodes::InvalidNamespace,
                    str::stream() << "Invalid namespace specified '" << nss.ns() << "'",
                    nss.isValid());

            // throws if collection does not exist or parameters are invalid
            ShardingCatalogManager::get(opCtx)->configureCollectionBalancing(
                opCtx,
                nss,
                request().getChunkSizeMB(),
                request().getDefragmentCollection(),
                request().getEnableAutoSplitter());
        }

    private:
        NamespaceString ns() const override {
            return request().getCommandParameter();
        }

        bool supportsWriteConcern() const override {
            return false;
        }

        void doCheckAuthorization(OperationContext* opCtx) const override {
            uassert(ErrorCodes::Unauthorized,
                    "Unauthorized",
                    AuthorizationSession::get(opCtx->getClient())
                        ->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
                                                           ActionType::internal));
        }
    };

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

    std::string help() const override {
        return "Internal command, which is exported by the sharding config server. Do not call "
               "directly.";
    }

    bool adminOnly() const override {
        return true;
    }

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

} configsvrConfigureCollectionBalancingCmd;

}  // namespace
}  // namespace mongo