/**
 *    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/db/commands/server_status.h"
#include "mongo/db/database_name.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/namespace_string.h"
#include "mongo/logv2/log.h"

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kFTDC

namespace mongo {
namespace {

class OplogTruncateMarkersServerStatusSection : public ServerStatusSection {
public:
    OplogTruncateMarkersServerStatusSection() : ServerStatusSection("oplogTruncation") {}
    /**
     * <ServerStatusSection>
     */
    bool includeByDefault() const override {
        return true;
    }

    /**
     * <ServerStatusSection>
     */
    BSONObj generateSection(OperationContext* opCtx,
                            const BSONElement& configElement) const override {
        BSONObjBuilder builder;
        if (!opCtx->getServiceContext()->getStorageEngine()->supportsOplogTruncateMarkers()) {
            return builder.obj();
        }

        // Hold reference to the catalog for collection lookup without locks to be safe.
        auto catalog = CollectionCatalog::get(opCtx);
        auto oplogCollection =
            catalog->lookupCollectionByNamespace(opCtx, NamespaceString::kRsOplogNamespace);
        if (oplogCollection) {
            oplogCollection->getRecordStore()->getOplogTruncateStats(builder);
        }
        return builder.obj();
    }

} oplogTruncateMarkersStats;

}  // namespace
}  // namespace mongo