/**
 *    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.
 */

#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand

#include "mongo/platform/basic.h"

#include "mongo/rpc/warn_deprecated_wire_ops.h"

#include <fmt/format.h>
#include <string>

#include "mongo/db/client.h"
#include "mongo/db/stats/counters.h"
#include "mongo/logv2/log.h"
#include "mongo/logv2/log_severity_suppressor.h"
#include "mongo/rpc/deprecated_wire_ops_gen.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/util/duration.h"
#include "mongo/util/static_immortal.h"
#include "mongo/util/synchronized_value.h"

namespace mongo {

using namespace fmt::literals;

namespace {

class SeveritySource {
public:
    logv2::LogSeverity get(const std::string& key) {
        return (***(_supressor))(key);
    }

    void refresh() {
        *(_supressor) = _makeSuppressor();
    }

private:
    using Suppressor = logv2::KeyedSeveritySuppressor<std::string>;

    static std::unique_ptr<Suppressor> _makeSuppressor() {
        return std::make_unique<Suppressor>(Seconds{deprecatedWireOpsWarningPeriodInSeconds.load()},
                                            logv2::LogSeverity::Warning(),
                                            logv2::LogSeverity::Debug(2));
    }

    synchronized_value<std::unique_ptr<Suppressor>> _supressor{_makeSuppressor()};
};

SeveritySource& getSeveritySource() {
    static StaticImmortal<SeveritySource> severitySource{};
    return *severitySource;
}

}  // namespace

Status onUpdateOfWireOpsWarningPeriod(const int& /*timeout*/) {
    // refresh() will fetch the current setting for the suppressor's timeout, which by this time
    // will have changed to the new value, so it's OK to ignore the provided new 'timeout' setting
    // here (which allows us to localize suppressor creation in 'SeveritySource' class.)
    getSeveritySource().refresh();
    return Status::OK();
}

void warnDeprecation(Client& client, StringData op) {
    std::string clientKey;
    BSONObj clientInfo;
    if (auto clientMetadata = ClientMetadata::get(&client); clientMetadata) {
        auto clientMetadataDoc = clientMetadata->getDocument();
        clientKey = "{}{}{}"_format(clientMetadata->getApplicationName(),
                                    clientMetadataDoc["driver"]["name"].toString(),
                                    clientMetadataDoc["driver"]["version"].toString());
        clientInfo = clientMetadataDoc;
    } else {
        clientKey = "{}"_format(client.clientAddress());
        clientInfo = BSON("address" << client.clientAddress(/*includePort*/ true));
    }

    LOGV2_DEBUG(5578800,
                getSeveritySource().get(clientKey).toInt(),
                "Deprecated operation requested. For more details see "
                "https://dochub.mongodb.org/core/legacy-opcode-compatibility",
                "op"_attr = op,
                "clientInfo"_attr = clientInfo);
}

void checkAllowedOpQueryCommand(Client& client, StringData cmd) {
    static constexpr std::array allowedOpQueryCommands{
        "_isSelf"_sd,
        "authenticate"_sd,
        "buildinfo"_sd,
        "buildInfo"_sd,
        "hello"_sd,
        "isMaster"_sd,
        "ismaster"_sd,
        "saslContinue"_sd,
        "saslStart"_sd,
    };

    if (std::find(allowedOpQueryCommands.begin(), allowedOpQueryCommands.end(), cmd) ==
        allowedOpQueryCommands.end()) {
        warnDeprecation(client, networkOpToString(dbQuery));
        globalOpCounters.gotQueryDeprecated();
        uasserted(ErrorCodes::UnsupportedOpQueryCommand,
                  "Unsupported OP_QUERY command: {}"_format(cmd));
    }
}

}  // namespace mongo