/**
 *    Copyright (C) 2022-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/db/auth/authorization_session.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/s/commands/cluster_count_cmd.h"
#include "mongo/s/grid.h"

namespace mongo {
namespace {

/**
 * Implements the cluster count command on mongod.
 */
struct ClusterCountCmdD {
    static constexpr StringData kName = "clusterCount"_sd;

    static const std::set<std::string>& getApiVersions() {
        return kNoApiVersions;
    }

    static Status checkAuthForOperation(OperationContext* opCtx) {
        auto* as = AuthorizationSession::get(opCtx->getClient());
        if (!as->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
                                                  ActionType::internal)) {
            return {ErrorCodes::Unauthorized, "unauthorized"};
        }

        return Status::OK();
    }

    static void checkCanRunHere(OperationContext* opCtx) {
        Grid::get(opCtx)->assertShardingIsInitialized();

        // A cluster command on the config server may attempt to use a ShardLocal to target itself,
        // which triggers an invariant, so only shard servers can run this.
        uassertStatusOK(ShardingState::get(opCtx)->canAcceptShardedCommands());
    }

    static void checkCanExplainHere(OperationContext* opCtx) {
        uasserted(ErrorCodes::CommandNotSupported,
                  "Cannot explain a cluster count command on a mongod");
    }
};
ClusterCountCmdBase<ClusterCountCmdD> clusterCountCmdD;

}  // namespace
}  // namespace mongo