/**
 *    Copyright (C) 2018-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/bson/bsonobjbuilder.h"
#include "mongo/transport/message_compressor_registry.h"

namespace mongo {
namespace {
const auto kBytesIn = "bytesIn"_sd;
const auto kBytesOut = "bytesOut"_sd;
}  // namespace

void appendMessageCompressionStats(BSONObjBuilder* b) {
    auto& registry = MessageCompressorRegistry::get();
    const auto& names = registry.getCompressorNames();
    if (names.empty()) {
        return;
    }
    BSONObjBuilder compressionSection(b->subobjStart("compression"));

    for (auto&& name : names) {
        auto&& compressor = registry.getCompressor(name);
        BSONObjBuilder base(compressionSection.subobjStart(name));

        BSONObjBuilder compressorSection(base.subobjStart("compressor"));
        compressorSection << kBytesIn << compressor->getCompressorBytesIn() << kBytesOut
                          << compressor->getCompressorBytesOut();
        compressorSection.doneFast();

        BSONObjBuilder decompressorSection(base.subobjStart("decompressor"));
        decompressorSection << kBytesIn << compressor->getDecompressorBytesIn() << kBytesOut
                            << compressor->getDecompressorBytesOut();
        decompressorSection.doneFast();
        base.doneFast();
    }
    compressionSection.doneFast();
}

}  // namespace mongo