/*
// Copyright (c) 2017 2018 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

#include "dbus-sdr/sensorcommands.hpp"

#include "dbus-sdr/sdrutils.hpp"
#include "dbus-sdr/sensorutils.hpp"
#include "dbus-sdr/storagecommands.hpp"

#include <algorithm>
#include <array>
#include <boost/algorithm/string.hpp>
#include <boost/container/flat_map.hpp>
#include <chrono>
#include <cmath>
#include <cstring>
#include <iostream>
#include <ipmid/api.hpp>
#include <ipmid/types.hpp>
#include <ipmid/utils.hpp>
#include <map>
#include <memory>
#include <optional>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/bus.hpp>
#include <stdexcept>
#include <string>
#include <user_channel/channel_layer.hpp>
#include <utility>
#include <variant>

#ifdef FEATURE_HYBRID_SENSORS

#include "sensordatahandler.hpp"
namespace ipmi
{
namespace sensor
{
extern const IdInfoMap sensors;
} // namespace sensor
} // namespace ipmi
#endif

constexpr std::array<const char*, 7> suffixes = {
    "_Output_Voltage", "_Input_Voltage", "_Output_Current", "_Input_Current",
    "_Output_Power",   "_Input_Power",   "_Temperature"};
namespace ipmi
{

using phosphor::logging::entry;
using phosphor::logging::level;
using phosphor::logging::log;

static constexpr int sensorMapUpdatePeriod = 10;
static constexpr int sensorMapSdrUpdatePeriod = 60;

// BMC I2C address is generally at 0x20
static constexpr uint8_t bmcI2CAddr = 0x20;

constexpr size_t maxSDRTotalSize =
    76; // Largest SDR Record Size (type 01) + SDR Overheader Size
constexpr static const uint32_t noTimestamp = 0xFFFFFFFF;

static uint16_t sdrReservationID;
static uint32_t sdrLastAdd = noTimestamp;
static uint32_t sdrLastRemove = noTimestamp;
static constexpr size_t lastRecordIndex = 0xFFFF;

// The IPMI spec defines four Logical Units (LUN), each capable of supporting
// 255 sensors. The 256 values assigned to LUN 2 are special and are not used
// for general purpose sensors. Each LUN reserves location 0xFF. The maximum
// number of IPMI sensors are LUN 0 + LUN 1 + LUN 2, less the reserved
// location.
static constexpr size_t maxIPMISensors = ((3 * 256) - (3 * 1));

static constexpr size_t lun0MaxSensorNum = 0xfe;
static constexpr size_t lun1MaxSensorNum = 0x1fe;
static constexpr size_t lun3MaxSensorNum = 0x3fe;
static constexpr int GENERAL_ERROR = -1;

static boost::container::flat_map<std::string, ObjectValueTree> SensorCache;

// Specify the comparison required to sort and find char* map objects
struct CmpStr
{
    bool operator()(const char* a, const char* b) const
    {
        return std::strcmp(a, b) < 0;
    }
};
const static boost::container::flat_map<const char*, SensorUnits, CmpStr>
    sensorUnits{{{"temperature", SensorUnits::degreesC},
                 {"voltage", SensorUnits::volts},
                 {"current", SensorUnits::amps},
                 {"fan_tach", SensorUnits::rpm},
                 {"power", SensorUnits::watts}}};

void registerSensorFunctions() __attribute__((constructor));

static sdbusplus::bus::match::match sensorAdded(
    *getSdBus(),
    "type='signal',member='InterfacesAdded',arg0path='/xyz/openbmc_project/"
    "sensors/'",
    [](sdbusplus::message::message& m) {
        getSensorTree().clear();
        sdrLastAdd = std::chrono::duration_cast<std::chrono::seconds>(
                         std::chrono::system_clock::now().time_since_epoch())
                         .count();
    });

static sdbusplus::bus::match::match sensorRemoved(
    *getSdBus(),
    "type='signal',member='InterfacesRemoved',arg0path='/xyz/openbmc_project/"
    "sensors/'",
    [](sdbusplus::message::message& m) {
        getSensorTree().clear();
        sdrLastRemove = std::chrono::duration_cast<std::chrono::seconds>(
                            std::chrono::system_clock::now().time_since_epoch())
                            .count();
    });

// this keeps track of deassertions for sensor event status command. A
// deasertion can only happen if an assertion was seen first.
static boost::container::flat_map<
    std::string, boost::container::flat_map<std::string, std::optional<bool>>>
    thresholdDeassertMap;

static sdbusplus::bus::match::match thresholdChanged(
    *getSdBus(),
    "type='signal',member='PropertiesChanged',interface='org.freedesktop.DBus."
    "Properties',arg0namespace='xyz.openbmc_project.Sensor.Threshold'",
    [](sdbusplus::message::message& m) {
        boost::container::flat_map<std::string, std::variant<bool, double>>
            values;
        m.read(std::string(), values);

        auto findAssert =
            std::find_if(values.begin(), values.end(), [](const auto& pair) {
                return pair.first.find("Alarm") != std::string::npos;
            });
        if (findAssert != values.end())
        {
            auto ptr = std::get_if<bool>(&(findAssert->second));
            if (ptr == nullptr)
            {
                phosphor::logging::log<phosphor::logging::level::ERR>(
                    "thresholdChanged: Assert non bool");
                return;
            }
            if (*ptr)
            {
                phosphor::logging::log<phosphor::logging::level::INFO>(
                    "thresholdChanged: Assert",
                    phosphor::logging::entry("SENSOR=%s", m.get_path()));
                thresholdDeassertMap[m.get_path()][findAssert->first] = *ptr;
            }
            else
            {
                auto& value =
                    thresholdDeassertMap[m.get_path()][findAssert->first];
                if (value)
                {
                    phosphor::logging::log<phosphor::logging::level::INFO>(
                        "thresholdChanged: deassert",
                        phosphor::logging::entry("SENSOR=%s", m.get_path()));
                    value = *ptr;
                }
            }
        }
    });

namespace sensor
{
static constexpr const char* vrInterface =
    "xyz.openbmc_project.Control.VoltageRegulatorMode";
static constexpr const char* sensorInterface =
    "xyz.openbmc_project.Sensor.Value";
} // namespace sensor

static void getSensorMaxMin(const DbusInterfaceMap& sensorMap, double& max,
                            double& min)
{
    max = 127;
    min = -128;

    auto sensorObject = sensorMap.find(sensor::sensorInterface);
    auto critical =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");
    auto warning =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");

    if (sensorObject != sensorMap.end())
    {
        auto maxMap = sensorObject->second.find("MaxValue");
        auto minMap = sensorObject->second.find("MinValue");

        if (maxMap != sensorObject->second.end())
        {
            max = std::visit(VariantToDoubleVisitor(), maxMap->second);
        }
        if (minMap != sensorObject->second.end())
        {
            min = std::visit(VariantToDoubleVisitor(), minMap->second);
        }
    }
    if (critical != sensorMap.end())
    {
        auto lower = critical->second.find("CriticalLow");
        auto upper = critical->second.find("CriticalHigh");
        if (lower != critical->second.end())
        {
            double value = std::visit(VariantToDoubleVisitor(), lower->second);
            min = std::min(value, min);
        }
        if (upper != critical->second.end())
        {
            double value = std::visit(VariantToDoubleVisitor(), upper->second);
            max = std::max(value, max);
        }
    }
    if (warning != sensorMap.end())
    {

        auto lower = warning->second.find("WarningLow");
        auto upper = warning->second.find("WarningHigh");
        if (lower != warning->second.end())
        {
            double value = std::visit(VariantToDoubleVisitor(), lower->second);
            min = std::min(value, min);
        }
        if (upper != warning->second.end())
        {
            double value = std::visit(VariantToDoubleVisitor(), upper->second);
            max = std::max(value, max);
        }
    }
}

static bool getSensorMap(ipmi::Context::ptr ctx, std::string sensorConnection,
                         std::string sensorPath, DbusInterfaceMap& sensorMap,
                         int updatePeriod = sensorMapUpdatePeriod)
{
#ifdef FEATURE_HYBRID_SENSORS
    if (auto sensor = findStaticSensor(sensorPath);
        sensor != ipmi::sensor::sensors.end() &&
        getSensorEventTypeFromPath(sensorPath) !=
            static_cast<uint8_t>(SensorEventTypeCodes::threshold))
    {
        // If the incoming sensor is a discrete sensor, it might fail in
        // getManagedObjects(), return true, and use its own getFunc to get
        // value.
        return true;
    }
#endif

    static boost::container::flat_map<
        std::string, std::chrono::time_point<std::chrono::steady_clock>>
        updateTimeMap;

    auto updateFind = updateTimeMap.find(sensorConnection);
    auto lastUpdate = std::chrono::time_point<std::chrono::steady_clock>();
    if (updateFind != updateTimeMap.end())
    {
        lastUpdate = updateFind->second;
    }

    auto now = std::chrono::steady_clock::now();

    if (std::chrono::duration_cast<std::chrono::seconds>(now - lastUpdate)
            .count() > updatePeriod)
    {
        ObjectValueTree managedObjects;
        boost::system::error_code ec = getManagedObjects(
            ctx, sensorConnection.c_str(), "/", managedObjects);
        if (ec)
        {
            phosphor::logging::log<phosphor::logging::level::ERR>(
                "GetMangagedObjects for getSensorMap failed",
                phosphor::logging::entry("ERROR=%s", ec.message().c_str()));

            return false;
        }

        SensorCache[sensorConnection] = managedObjects;
        // Update time after finish building the map which allow the
        // data to be cached for updatePeriod plus the build time.
        updateTimeMap[sensorConnection] = std::chrono::steady_clock::now();
    }
    auto connection = SensorCache.find(sensorConnection);
    if (connection == SensorCache.end())
    {
        return false;
    }
    auto path = connection->second.find(sensorPath);
    if (path == connection->second.end())
    {
        return false;
    }
    sensorMap = path->second;

    return true;
}

namespace sensor
{
// Read VR profiles from sensor(daemon) interface
static std::optional<std::vector<std::string>>
    getSupportedVrProfiles(const ipmi::DbusInterfaceMap::mapped_type& object)
{
    // get VR mode profiles from Supported Interface
    auto supportedProperty = object.find("Supported");
    if (supportedProperty == object.end() ||
        object.find("Selected") == object.end())
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Missing the required Supported and Selected properties");
        return std::nullopt;
    }

    const auto profilesPtr =
        std::get_if<std::vector<std::string>>(&supportedProperty->second);

    if (profilesPtr == nullptr)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "property is not array of string");
        return std::nullopt;
    }
    return *profilesPtr;
}

// Calculate VR Mode from input IPMI discrete event bytes
static std::optional<std::string>
    calculateVRMode(uint15_t assertOffset,
                    const ipmi::DbusInterfaceMap::mapped_type& VRObject)
{
    // get VR mode profiles from Supported Interface
    auto profiles = getSupportedVrProfiles(VRObject);
    if (!profiles)
    {
        return std::nullopt;
    }

    // interpret IPMI cmd bits into profiles' index
    long unsigned int index = 0;
    // only one bit should be set and the highest bit should not be used.
    if (assertOffset == 0 || assertOffset == (1u << 15) ||
        (assertOffset & (assertOffset - 1)))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "IPMI cmd format incorrect",

            phosphor::logging::entry("BYTES=%#02x",
                                     static_cast<uint16_t>(assertOffset)));
        return std::nullopt;
    }

    while (assertOffset != 1)
    {
        assertOffset >>= 1;
        index++;
    }

    if (index >= profiles->size())
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "profile index out of boundary");
        return std::nullopt;
    }

    return profiles->at(index);
}

// Calculate sensor value from IPMI reading byte
static std::optional<double>
    calculateValue(uint8_t reading, const ipmi::DbusInterfaceMap& sensorMap,
                   const ipmi::DbusInterfaceMap::mapped_type& valueObject)
{
    if (valueObject.find("Value") == valueObject.end())
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Missing the required Value property");
        return std::nullopt;
    }

    double max = 0;
    double min = 0;
    getSensorMaxMin(sensorMap, max, min);

    int16_t mValue = 0;
    int16_t bValue = 0;
    int8_t rExp = 0;
    int8_t bExp = 0;
    bool bSigned = false;

    if (!getSensorAttributes(max, min, mValue, rExp, bValue, bExp, bSigned))
    {
        return std::nullopt;
    }

    double value = bSigned ? ((int8_t)reading) : reading;

    value *= ((double)mValue);
    value += ((double)bValue) * std::pow(10.0, bExp);
    value *= std::pow(10.0, rExp);

    return value;
}

// Extract file name from sensor path as the sensors SDR ID. Simplify the name
// if it is too long.
std::string parseSdrIdFromPath(const std::string& path)
{
    std::string name;
    size_t nameStart = path.rfind("/");
    if (nameStart != std::string::npos)
    {
        name = path.substr(nameStart + 1, std::string::npos - nameStart);
    }

    if (name.size() > FULL_RECORD_ID_STR_MAX_LENGTH)
    {
        // try to not truncate by replacing common words
        for (const auto& suffix : suffixes)
        {
            if (boost::ends_with(name, suffix))
            {
                boost::replace_all(name, suffix, "");
                break;
            }
        }
        if (name.size() > FULL_RECORD_ID_STR_MAX_LENGTH)
        {
            name.resize(FULL_RECORD_ID_STR_MAX_LENGTH);
        }
    }
    std::replace(name.begin(), name.end(), '_', ' ');
    return name;
}

bool getVrEventStatus(ipmi::Context::ptr ctx, const std::string& connection,
                      const std::string& path,
                      const ipmi::DbusInterfaceMap::mapped_type& object,
                      std::bitset<16>& assertions)
{
    auto profiles = sensor::getSupportedVrProfiles(object);
    if (!profiles)
    {
        return false;
    }
    ipmi::Value modeVariant;

    auto ec = getDbusProperty(ctx, connection, path, sensor::vrInterface,
                              "Selected", modeVariant);
    if (ec)
    {
        log<level::ERR>("Failed to get property",
                        entry("PROPERTY=%s", "Selected"),
                        entry("PATH=%s", path.c_str()),
                        entry("INTERFACE=%s", sensor::sensorInterface),
                        entry("WHAT=%s", ec.message().c_str()));
        return false;
    }

    auto mode = std::get_if<std::string>(&modeVariant);
    if (mode == nullptr)
    {
        log<level::ERR>("property is not a string",
                        entry("PROPERTY=%s", "Selected"),
                        entry("PATH=%s", path.c_str()),
                        entry("INTERFACE=%s", sensor::sensorInterface));
        return false;
    }

    auto itr = std::find(profiles->begin(), profiles->end(), *mode);
    if (itr == profiles->end())
    {
        using namespace phosphor::logging;
        log<level::ERR>("VR mode doesn't match any of its profiles",
                        entry("PATH=%s", path.c_str()));
        return false;
    }
    std::size_t index =
        static_cast<std::size_t>(std::distance(profiles->begin(), itr));

    // map index to reponse event assertion bit.
    if (index < 8)
    {
        assertions.set(1u << index);
    }
    else if (index < 15)
    {
        assertions.set(1u << (index - 8));
    }
    else
    {
        log<level::ERR>("VR profile index reaches max assertion bit",
                        entry("PATH=%s", path.c_str()),
                        entry("INDEX=%uz", index));
        return false;
    }
    if constexpr (debug)
    {
        std::cerr << "VR sensor " << sensor::parseSdrIdFromPath(path)
                  << " mode is: [" << index << "] " << *mode << std::endl;
    }
    return true;
}
} // namespace sensor

ipmi::RspType<> ipmiSenPlatformEvent(ipmi::Context::ptr ctx,
                                     ipmi::message::Payload& p)
{
    constexpr const uint8_t validEnvmRev = 0x04;
    constexpr const uint8_t lastSensorType = 0x2C;
    constexpr const uint8_t oemReserved = 0xC0;

    uint8_t generatorID = 0;
    uint8_t evmRev = 0;
    uint8_t sensorType = 0;
    uint8_t sensorNum = 0;
    uint8_t eventType = 0;
    uint8_t eventData1 = 0;
    std::optional<uint8_t> eventData2 = 0;
    std::optional<uint8_t> eventData3 = 0;
    ipmi::ChannelInfo chInfo;

    if (ipmi::getChannelInfo(ctx->channel, chInfo) != ipmi::ccSuccess)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Failed to get Channel Info",
            phosphor::logging::entry("CHANNEL=%d", ctx->channel));
        return ipmi::responseUnspecifiedError();
    }

    if (static_cast<ipmi::EChannelMediumType>(chInfo.mediumType) ==
        ipmi::EChannelMediumType::systemInterface)
    {

        p.unpack(generatorID, evmRev, sensorType, sensorNum, eventType,
                 eventData1, eventData2, eventData3);
    }
    else
    {

        p.unpack(evmRev, sensorType, sensorNum, eventType, eventData1,
                 eventData2, eventData3);
        generatorID = ctx->rqSA;
    }

    if (!p.fullyUnpacked())
    {
        return ipmi::responseReqDataLenInvalid();
    }

    // Check for valid evmRev and Sensor Type(per Table 42 of spec)
    if (evmRev != validEnvmRev)
    {
        return ipmi::responseInvalidFieldRequest();
    }
    if ((sensorType > lastSensorType) && (sensorType < oemReserved))
    {
        return ipmi::responseInvalidFieldRequest();
    }

    return ipmi::responseSuccess();
}

ipmi::RspType<> ipmiSetSensorReading(ipmi::Context::ptr ctx,
                                     uint8_t sensorNumber, uint8_t operation,
                                     uint8_t reading, uint15_t assertOffset,
                                     bool resvd1, uint15_t deassertOffset,
                                     bool resvd2, uint8_t eventData1,
                                     uint8_t eventData2, uint8_t eventData3)
{
    std::string connection;
    std::string path;
    std::vector<std::string> interfaces;

    ipmi::Cc status =
        getSensorConnection(ctx, sensorNumber, connection, path, &interfaces);
    if (status)
    {
        return ipmi::response(status);
    }

    // we can tell the sensor type by its interface type
    if (std::find(interfaces.begin(), interfaces.end(),
                  sensor::sensorInterface) != interfaces.end())
    {
        DbusInterfaceMap sensorMap;
        if (!getSensorMap(ctx, connection, path, sensorMap))
        {
            return ipmi::responseResponseError();
        }
        auto sensorObject = sensorMap.find(sensor::sensorInterface);
        if (sensorObject == sensorMap.end())
        {
            return ipmi::responseResponseError();
        }

        // Only allow external SetSensor if write permission granted
        if (!details::sdrWriteTable.getWritePermission(sensorNumber))
        {
            return ipmi::responseResponseError();
        }

        auto value =
            sensor::calculateValue(reading, sensorMap, sensorObject->second);
        if (!value)
        {
            return ipmi::responseResponseError();
        }

        if constexpr (debug)
        {
            phosphor::logging::log<phosphor::logging::level::INFO>(
                "IPMI SET_SENSOR",
                phosphor::logging::entry("SENSOR_NUM=%d", sensorNumber),
                phosphor::logging::entry("BYTE=%u", (unsigned int)reading),
                phosphor::logging::entry("VALUE=%f", *value));
        }

        boost::system::error_code ec =
            setDbusProperty(ctx, connection, path, sensor::sensorInterface,
                            "Value", ipmi::Value(*value));

        // setDbusProperty intended to resolve dbus exception/rc within the
        // function but failed to achieve that. Catch exception in the ipmi
        // callback functions for now (e.g. ipmiSetSensorReading).
        if (ec)
        {
            using namespace phosphor::logging;
            log<level::ERR>("Failed to set property",
                            entry("PROPERTY=%s", "Value"),
                            entry("PATH=%s", path.c_str()),
                            entry("INTERFACE=%s", sensor::sensorInterface),
                            entry("WHAT=%s", ec.message().c_str()));
            return ipmi::responseResponseError();
        }
        return ipmi::responseSuccess();
    }

    if (std::find(interfaces.begin(), interfaces.end(), sensor::vrInterface) !=
        interfaces.end())
    {
        DbusInterfaceMap sensorMap;
        if (!getSensorMap(ctx, connection, path, sensorMap))
        {
            return ipmi::responseResponseError();
        }
        auto sensorObject = sensorMap.find(sensor::vrInterface);
        if (sensorObject == sensorMap.end())
        {
            return ipmi::responseResponseError();
        }

        // VR sensors are treated as a special case and we will not check the
        // write permission for VR sensors, since they always deemed writable
        // and permission table are not applied to VR sensors.
        auto vrMode =
            sensor::calculateVRMode(assertOffset, sensorObject->second);
        if (!vrMode)
        {
            return ipmi::responseResponseError();
        }
        boost::system::error_code ec = setDbusProperty(
            ctx, connection, path, sensor::vrInterface, "Selected", *vrMode);
        // setDbusProperty intended to resolve dbus exception/rc within the
        // function but failed to achieve that. Catch exception in the ipmi
        // callback functions for now (e.g. ipmiSetSensorReading).
        if (ec)
        {
            using namespace phosphor::logging;
            log<level::ERR>("Failed to set property",
                            entry("PROPERTY=%s", "Selected"),
                            entry("PATH=%s", path.c_str()),
                            entry("INTERFACE=%s", sensor::sensorInterface),
                            entry("WHAT=%s", ec.message().c_str()));
            return ipmi::responseResponseError();
        }
        return ipmi::responseSuccess();
    }

    phosphor::logging::log<phosphor::logging::level::ERR>(
        "unknown sensor type",
        phosphor::logging::entry("PATH=%s", path.c_str()));
    return ipmi::responseResponseError();
}

ipmi::RspType<uint8_t, uint8_t, uint8_t, std::optional<uint8_t>>
    ipmiSenGetSensorReading(ipmi::Context::ptr ctx, uint8_t sensnum)
{
    std::string connection;
    std::string path;

    if (sensnum == reservedSensorNumber)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    auto status = getSensorConnection(ctx, sensnum, connection, path);
    if (status)
    {
        return ipmi::response(status);
    }

#ifdef FEATURE_HYBRID_SENSORS
    if (auto sensor = findStaticSensor(path);
        sensor != ipmi::sensor::sensors.end() &&
        getSensorEventTypeFromPath(path) !=
            static_cast<uint8_t>(SensorEventTypeCodes::threshold))
    {
        if (ipmi::sensor::Mutability::Read !=
            (sensor->second.mutability & ipmi::sensor::Mutability::Read))
        {
            return ipmi::responseIllegalCommand();
        }

        uint8_t operation;
        try
        {
            ipmi::sensor::GetSensorResponse getResponse =
                sensor->second.getFunc(sensor->second);

            if (getResponse.readingOrStateUnavailable)
            {
                operation |= static_cast<uint8_t>(
                    IPMISensorReadingByte2::readingStateUnavailable);
            }
            if (getResponse.scanningEnabled)
            {
                operation |= static_cast<uint8_t>(
                    IPMISensorReadingByte2::sensorScanningEnable);
            }
            if (getResponse.allEventMessagesEnabled)
            {
                operation |= static_cast<uint8_t>(
                    IPMISensorReadingByte2::eventMessagesEnable);
            }
            return ipmi::responseSuccess(
                getResponse.reading, operation,
                getResponse.thresholdLevelsStates,
                getResponse.discreteReadingSensorStates);
        }
        catch (const std::exception& e)
        {
            operation |= static_cast<uint8_t>(
                IPMISensorReadingByte2::readingStateUnavailable);
            return ipmi::responseSuccess(0, operation, 0, std::nullopt);
        }
    }
#endif

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, connection, path, sensorMap))
    {
        return ipmi::responseResponseError();
    }
    auto sensorObject = sensorMap.find(sensor::sensorInterface);

    if (sensorObject == sensorMap.end() ||
        sensorObject->second.find("Value") == sensorObject->second.end())
    {
        return ipmi::responseResponseError();
    }
    auto& valueVariant = sensorObject->second["Value"];
    double reading = std::visit(VariantToDoubleVisitor(), valueVariant);

    double max = 0;
    double min = 0;
    getSensorMaxMin(sensorMap, max, min);

    int16_t mValue = 0;
    int16_t bValue = 0;
    int8_t rExp = 0;
    int8_t bExp = 0;
    bool bSigned = false;

    if (!getSensorAttributes(max, min, mValue, rExp, bValue, bExp, bSigned))
    {
        return ipmi::responseResponseError();
    }

    uint8_t value =
        scaleIPMIValueFromDouble(reading, mValue, rExp, bValue, bExp, bSigned);
    uint8_t operation =
        static_cast<uint8_t>(IPMISensorReadingByte2::sensorScanningEnable);
    operation |=
        static_cast<uint8_t>(IPMISensorReadingByte2::eventMessagesEnable);
    bool notReading = std::isnan(reading);

    if (!notReading)
    {
        auto availableObject =
            sensorMap.find("xyz.openbmc_project.State.Decorator.Availability");
        if (availableObject != sensorMap.end())
        {
            auto findAvailable = availableObject->second.find("Available");
            if (findAvailable != availableObject->second.end())
            {
                bool* available = std::get_if<bool>(&(findAvailable->second));
                if (available && !(*available))
                {
                    notReading = true;
                }
            }
        }
    }

    if (notReading)
    {
        operation |= static_cast<uint8_t>(
            IPMISensorReadingByte2::readingStateUnavailable);
    }

    if constexpr (details::enableInstrumentation)
    {
        int byteValue;
        if (bSigned)
        {
            byteValue = static_cast<int>(static_cast<int8_t>(value));
        }
        else
        {
            byteValue = static_cast<int>(static_cast<uint8_t>(value));
        }

        // Keep stats on the reading just obtained, even if it is "NaN"
        if (details::sdrStatsTable.updateReading(sensnum, reading, byteValue))
        {
            // This is the first reading, show the coefficients
            double step = (max - min) / 255.0;
            std::cerr << "IPMI sensor "
                      << details::sdrStatsTable.getName(sensnum)
                      << ": Range min=" << min << " max=" << max
                      << ", step=" << step
                      << ", Coefficients mValue=" << static_cast<int>(mValue)
                      << " rExp=" << static_cast<int>(rExp)
                      << " bValue=" << static_cast<int>(bValue)
                      << " bExp=" << static_cast<int>(bExp)
                      << " bSigned=" << static_cast<int>(bSigned) << "\n";
        }
    }

    uint8_t thresholds = 0;

    auto warningObject =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");
    if (warningObject != sensorMap.end())
    {
        auto alarmHigh = warningObject->second.find("WarningAlarmHigh");
        auto alarmLow = warningObject->second.find("WarningAlarmLow");
        if (alarmHigh != warningObject->second.end())
        {
            if (std::get<bool>(alarmHigh->second))
            {
                thresholds |= static_cast<uint8_t>(
                    IPMISensorReadingByte3::upperNonCritical);
            }
        }
        if (alarmLow != warningObject->second.end())
        {
            if (std::get<bool>(alarmLow->second))
            {
                thresholds |= static_cast<uint8_t>(
                    IPMISensorReadingByte3::lowerNonCritical);
            }
        }
    }

    auto criticalObject =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");
    if (criticalObject != sensorMap.end())
    {
        auto alarmHigh = criticalObject->second.find("CriticalAlarmHigh");
        auto alarmLow = criticalObject->second.find("CriticalAlarmLow");
        if (alarmHigh != criticalObject->second.end())
        {
            if (std::get<bool>(alarmHigh->second))
            {
                thresholds |=
                    static_cast<uint8_t>(IPMISensorReadingByte3::upperCritical);
            }
        }
        if (alarmLow != criticalObject->second.end())
        {
            if (std::get<bool>(alarmLow->second))
            {
                thresholds |=
                    static_cast<uint8_t>(IPMISensorReadingByte3::lowerCritical);
            }
        }
    }

    // no discrete as of today so optional byte is never returned
    return ipmi::responseSuccess(value, operation, thresholds, std::nullopt);
}

/** @brief implements the Set Sensor threshold command
 *  @param sensorNumber        - sensor number
 *  @param lowerNonCriticalThreshMask
 *  @param lowerCriticalThreshMask
 *  @param lowerNonRecovThreshMask
 *  @param upperNonCriticalThreshMask
 *  @param upperCriticalThreshMask
 *  @param upperNonRecovThreshMask
 *  @param reserved
 *  @param lowerNonCritical    - lower non-critical threshold
 *  @param lowerCritical       - Lower critical threshold
 *  @param lowerNonRecoverable - Lower non recovarable threshold
 *  @param upperNonCritical    - Upper non-critical threshold
 *  @param upperCritical       - Upper critical
 *  @param upperNonRecoverable - Upper Non-recoverable
 *
 *  @returns IPMI completion code
 */
ipmi::RspType<> ipmiSenSetSensorThresholds(
    ipmi::Context::ptr ctx, uint8_t sensorNum, bool lowerNonCriticalThreshMask,
    bool lowerCriticalThreshMask, bool lowerNonRecovThreshMask,
    bool upperNonCriticalThreshMask, bool upperCriticalThreshMask,
    bool upperNonRecovThreshMask, uint2_t reserved, uint8_t lowerNonCritical,
    uint8_t lowerCritical, uint8_t lowerNonRecoverable,
    uint8_t upperNonCritical, uint8_t upperCritical,
    uint8_t upperNonRecoverable)
{
    if (sensorNum == reservedSensorNumber || reserved)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    // lower nc and upper nc not suppported on any sensor
    if (lowerNonRecovThreshMask || upperNonRecovThreshMask)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    // if none of the threshold mask are set, nothing to do
    if (!(lowerNonCriticalThreshMask | lowerCriticalThreshMask |
          lowerNonRecovThreshMask | upperNonCriticalThreshMask |
          upperCriticalThreshMask | upperNonRecovThreshMask))
    {
        return ipmi::responseSuccess();
    }

    std::string connection;
    std::string path;

    ipmi::Cc status = getSensorConnection(ctx, sensorNum, connection, path);
    if (status)
    {
        return ipmi::response(status);
    }
    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, connection, path, sensorMap))
    {
        return ipmi::responseResponseError();
    }

    double max = 0;
    double min = 0;
    getSensorMaxMin(sensorMap, max, min);

    int16_t mValue = 0;
    int16_t bValue = 0;
    int8_t rExp = 0;
    int8_t bExp = 0;
    bool bSigned = false;

    if (!getSensorAttributes(max, min, mValue, rExp, bValue, bExp, bSigned))
    {
        return ipmi::responseResponseError();
    }

    // store a vector of property name, value to set, and interface
    std::vector<std::tuple<std::string, uint8_t, std::string>> thresholdsToSet;

    // define the indexes of the tuple
    constexpr uint8_t propertyName = 0;
    constexpr uint8_t thresholdValue = 1;
    constexpr uint8_t interface = 2;
    // verifiy all needed fields are present
    if (lowerCriticalThreshMask || upperCriticalThreshMask)
    {
        auto findThreshold =
            sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");
        if (findThreshold == sensorMap.end())
        {
            return ipmi::responseInvalidFieldRequest();
        }
        if (lowerCriticalThreshMask)
        {
            auto findLower = findThreshold->second.find("CriticalLow");
            if (findLower == findThreshold->second.end())
            {
                return ipmi::responseInvalidFieldRequest();
            }
            thresholdsToSet.emplace_back("CriticalLow", lowerCritical,
                                         findThreshold->first);
        }
        if (upperCriticalThreshMask)
        {
            auto findUpper = findThreshold->second.find("CriticalHigh");
            if (findUpper == findThreshold->second.end())
            {
                return ipmi::responseInvalidFieldRequest();
            }
            thresholdsToSet.emplace_back("CriticalHigh", upperCritical,
                                         findThreshold->first);
        }
    }
    if (lowerNonCriticalThreshMask || upperNonCriticalThreshMask)
    {
        auto findThreshold =
            sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");
        if (findThreshold == sensorMap.end())
        {
            return ipmi::responseInvalidFieldRequest();
        }
        if (lowerNonCriticalThreshMask)
        {
            auto findLower = findThreshold->second.find("WarningLow");
            if (findLower == findThreshold->second.end())
            {
                return ipmi::responseInvalidFieldRequest();
            }
            thresholdsToSet.emplace_back("WarningLow", lowerNonCritical,
                                         findThreshold->first);
        }
        if (upperNonCriticalThreshMask)
        {
            auto findUpper = findThreshold->second.find("WarningHigh");
            if (findUpper == findThreshold->second.end())
            {
                return ipmi::responseInvalidFieldRequest();
            }
            thresholdsToSet.emplace_back("WarningHigh", upperNonCritical,
                                         findThreshold->first);
        }
    }
    for (const auto& property : thresholdsToSet)
    {
        // from section 36.3 in the IPMI Spec, assume all linear
        double valueToSet = ((mValue * std::get<thresholdValue>(property)) +
                             (bValue * std::pow(10.0, bExp))) *
                            std::pow(10.0, rExp);
        setDbusProperty(
            *getSdBus(), connection, path, std::get<interface>(property),
            std::get<propertyName>(property), ipmi::Value(valueToSet));
    }
    return ipmi::responseSuccess();
}

IPMIThresholds getIPMIThresholds(const DbusInterfaceMap& sensorMap)
{
    IPMIThresholds resp;
    auto warningInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");
    auto criticalInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");

    if ((warningInterface != sensorMap.end()) ||
        (criticalInterface != sensorMap.end()))
    {
        auto sensorPair = sensorMap.find(sensor::sensorInterface);

        if (sensorPair == sensorMap.end())
        {
            // should not have been able to find a sensor not implementing
            // the sensor object
            throw std::runtime_error("Invalid sensor map");
        }

        double max = 0;
        double min = 0;
        getSensorMaxMin(sensorMap, max, min);

        int16_t mValue = 0;
        int16_t bValue = 0;
        int8_t rExp = 0;
        int8_t bExp = 0;
        bool bSigned = false;

        if (!getSensorAttributes(max, min, mValue, rExp, bValue, bExp, bSigned))
        {
            throw std::runtime_error("Invalid sensor atrributes");
        }
        if (warningInterface != sensorMap.end())
        {
            auto& warningMap = warningInterface->second;

            auto warningHigh = warningMap.find("WarningHigh");
            auto warningLow = warningMap.find("WarningLow");

            if (warningHigh != warningMap.end())
            {

                double value =
                    std::visit(VariantToDoubleVisitor(), warningHigh->second);
                resp.warningHigh = scaleIPMIValueFromDouble(
                    value, mValue, rExp, bValue, bExp, bSigned);
            }
            if (warningLow != warningMap.end())
            {
                double value =
                    std::visit(VariantToDoubleVisitor(), warningLow->second);
                resp.warningLow = scaleIPMIValueFromDouble(
                    value, mValue, rExp, bValue, bExp, bSigned);
            }
        }
        if (criticalInterface != sensorMap.end())
        {
            auto& criticalMap = criticalInterface->second;

            auto criticalHigh = criticalMap.find("CriticalHigh");
            auto criticalLow = criticalMap.find("CriticalLow");

            if (criticalHigh != criticalMap.end())
            {
                double value =
                    std::visit(VariantToDoubleVisitor(), criticalHigh->second);
                resp.criticalHigh = scaleIPMIValueFromDouble(
                    value, mValue, rExp, bValue, bExp, bSigned);
            }
            if (criticalLow != criticalMap.end())
            {
                double value =
                    std::visit(VariantToDoubleVisitor(), criticalLow->second);
                resp.criticalLow = scaleIPMIValueFromDouble(
                    value, mValue, rExp, bValue, bExp, bSigned);
            }
        }
    }
    return resp;
}

ipmi::RspType<uint8_t, // readable
              uint8_t, // lowerNCrit
              uint8_t, // lowerCrit
              uint8_t, // lowerNrecoverable
              uint8_t, // upperNC
              uint8_t, // upperCrit
              uint8_t> // upperNRecoverable
    ipmiSenGetSensorThresholds(ipmi::Context::ptr ctx, uint8_t sensorNumber)
{
    std::string connection;
    std::string path;

    if (sensorNumber == reservedSensorNumber)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    auto status = getSensorConnection(ctx, sensorNumber, connection, path);
    if (status)
    {
        return ipmi::response(status);
    }

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, connection, path, sensorMap))
    {
        return ipmi::responseResponseError();
    }

    IPMIThresholds thresholdData;
    try
    {
        thresholdData = getIPMIThresholds(sensorMap);
    }
    catch (const std::exception&)
    {
        return ipmi::responseResponseError();
    }

    uint8_t readable = 0;
    uint8_t lowerNC = 0;
    uint8_t lowerCritical = 0;
    uint8_t lowerNonRecoverable = 0;
    uint8_t upperNC = 0;
    uint8_t upperCritical = 0;
    uint8_t upperNonRecoverable = 0;

    if (thresholdData.warningHigh)
    {
        readable |=
            1 << static_cast<uint8_t>(IPMIThresholdRespBits::upperNonCritical);
        upperNC = *thresholdData.warningHigh;
    }
    if (thresholdData.warningLow)
    {
        readable |=
            1 << static_cast<uint8_t>(IPMIThresholdRespBits::lowerNonCritical);
        lowerNC = *thresholdData.warningLow;
    }

    if (thresholdData.criticalHigh)
    {
        readable |=
            1 << static_cast<uint8_t>(IPMIThresholdRespBits::upperCritical);
        upperCritical = *thresholdData.criticalHigh;
    }
    if (thresholdData.criticalLow)
    {
        readable |=
            1 << static_cast<uint8_t>(IPMIThresholdRespBits::lowerCritical);
        lowerCritical = *thresholdData.criticalLow;
    }

    return ipmi::responseSuccess(readable, lowerNC, lowerCritical,
                                 lowerNonRecoverable, upperNC, upperCritical,
                                 upperNonRecoverable);
}

/** @brief implements the get Sensor event enable command
 *  @param sensorNumber - sensor number
 *
 *  @returns IPMI completion code plus response data
 *   - enabled               - Sensor Event messages
 *   - assertionEnabledLsb   - Assertion event messages
 *   - assertionEnabledMsb   - Assertion event messages
 *   - deassertionEnabledLsb - Deassertion event messages
 *   - deassertionEnabledMsb - Deassertion event messages
 */

ipmi::RspType<uint8_t, // enabled
              uint8_t, // assertionEnabledLsb
              uint8_t, // assertionEnabledMsb
              uint8_t, // deassertionEnabledLsb
              uint8_t> // deassertionEnabledMsb
    ipmiSenGetSensorEventEnable(ipmi::Context::ptr ctx, uint8_t sensorNum)
{
    std::string connection;
    std::string path;

    uint8_t enabled = 0;
    uint8_t assertionEnabledLsb = 0;
    uint8_t assertionEnabledMsb = 0;
    uint8_t deassertionEnabledLsb = 0;
    uint8_t deassertionEnabledMsb = 0;

    if (sensorNum == reservedSensorNumber)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    auto status = getSensorConnection(ctx, sensorNum, connection, path);
    if (status)
    {
        return ipmi::response(status);
    }

#ifdef FEATURE_HYBRID_SENSORS
    if (auto sensor = findStaticSensor(path);
        sensor != ipmi::sensor::sensors.end() &&
        getSensorEventTypeFromPath(path) !=
            static_cast<uint8_t>(SensorEventTypeCodes::threshold))
    {
        enabled = static_cast<uint8_t>(
            IPMISensorEventEnableByte2::sensorScanningEnable);
        uint16_t assertionEnabled = 0;
        for (auto& offsetValMap : sensor->second.propertyInterfaces.begin()
                                      ->second.begin()
                                      ->second.second)
        {
            assertionEnabled |= (1 << offsetValMap.first);
        }
        assertionEnabledLsb = static_cast<uint8_t>((assertionEnabled & 0xFF));
        assertionEnabledMsb =
            static_cast<uint8_t>(((assertionEnabled >> 8) & 0xFF));

        return ipmi::responseSuccess(enabled, assertionEnabledLsb,
                                     assertionEnabledMsb, deassertionEnabledLsb,
                                     deassertionEnabledMsb);
    }
#endif

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, connection, path, sensorMap))
    {
        return ipmi::responseResponseError();
    }

    auto warningInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");
    auto criticalInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");
    if ((warningInterface != sensorMap.end()) ||
        (criticalInterface != sensorMap.end()))
    {
        enabled = static_cast<uint8_t>(
            IPMISensorEventEnableByte2::sensorScanningEnable);
        if (warningInterface != sensorMap.end())
        {
            auto& warningMap = warningInterface->second;

            auto warningHigh = warningMap.find("WarningHigh");
            auto warningLow = warningMap.find("WarningLow");
            if (warningHigh != warningMap.end())
            {
                assertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::upperNonCriticalGoingHigh);
                deassertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::upperNonCriticalGoingLow);
            }
            if (warningLow != warningMap.end())
            {
                assertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::lowerNonCriticalGoingLow);
                deassertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::lowerNonCriticalGoingHigh);
            }
        }
        if (criticalInterface != sensorMap.end())
        {
            auto& criticalMap = criticalInterface->second;

            auto criticalHigh = criticalMap.find("CriticalHigh");
            auto criticalLow = criticalMap.find("CriticalLow");

            if (criticalHigh != criticalMap.end())
            {
                assertionEnabledMsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::upperCriticalGoingHigh);
                deassertionEnabledMsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::upperCriticalGoingLow);
            }
            if (criticalLow != criticalMap.end())
            {
                assertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::lowerCriticalGoingLow);
                deassertionEnabledLsb |= static_cast<uint8_t>(
                    IPMISensorEventEnableThresholds::lowerCriticalGoingHigh);
            }
        }
    }

    return ipmi::responseSuccess(enabled, assertionEnabledLsb,
                                 assertionEnabledMsb, deassertionEnabledLsb,
                                 deassertionEnabledMsb);
}

/** @brief implements the get Sensor event status command
 *  @param sensorNumber - sensor number, FFh = reserved
 *
 *  @returns IPMI completion code plus response data
 *   - sensorEventStatus - Sensor Event messages state
 *   - assertions        - Assertion event messages
 *   - deassertions      - Deassertion event messages
 */
ipmi::RspType<uint8_t,         // sensorEventStatus
              std::bitset<16>, // assertions
              std::bitset<16>  // deassertion
              >
    ipmiSenGetSensorEventStatus(ipmi::Context::ptr ctx, uint8_t sensorNum)
{
    if (sensorNum == reservedSensorNumber)
    {
        return ipmi::responseInvalidFieldRequest();
    }

    std::string connection;
    std::string path;
    auto status = getSensorConnection(ctx, sensorNum, connection, path);
    if (status)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiSenGetSensorEventStatus: Sensor connection Error",
            phosphor::logging::entry("SENSOR=%d", sensorNum));
        return ipmi::response(status);
    }

#ifdef FEATURE_HYBRID_SENSORS
    if (auto sensor = findStaticSensor(path);
        sensor != ipmi::sensor::sensors.end() &&
        getSensorEventTypeFromPath(path) !=
            static_cast<uint8_t>(SensorEventTypeCodes::threshold))
    {
        auto response = ipmi::sensor::get::mapDbusToAssertion(
            sensor->second, path, sensor->second.sensorInterface);
        std::bitset<16> assertions;
        // deassertions are not used.
        std::bitset<16> deassertions = 0;
        uint8_t sensorEventStatus;
        if (response.readingOrStateUnavailable)
        {
            sensorEventStatus |= static_cast<uint8_t>(
                IPMISensorReadingByte2::readingStateUnavailable);
        }
        if (response.scanningEnabled)
        {
            sensorEventStatus |= static_cast<uint8_t>(
                IPMISensorReadingByte2::sensorScanningEnable);
        }
        if (response.allEventMessagesEnabled)
        {
            sensorEventStatus |= static_cast<uint8_t>(
                IPMISensorReadingByte2::eventMessagesEnable);
        }
        assertions |= response.discreteReadingSensorStates << 8;
        assertions |= response.thresholdLevelsStates;
        return ipmi::responseSuccess(sensorEventStatus, assertions,
                                     deassertions);
    }
#endif

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, connection, path, sensorMap))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiSenGetSensorEventStatus: Sensor Mapping Error",
            phosphor::logging::entry("SENSOR=%s", path.c_str()));
        return ipmi::responseResponseError();
    }

    uint8_t sensorEventStatus =
        static_cast<uint8_t>(IPMISensorEventEnableByte2::sensorScanningEnable);
    std::bitset<16> assertions = 0;
    std::bitset<16> deassertions = 0;

    // handle VR typed sensor
    auto vrInterface = sensorMap.find(sensor::vrInterface);
    if (vrInterface != sensorMap.end())
    {
        if (!sensor::getVrEventStatus(ctx, connection, path,
                                      vrInterface->second, assertions))
        {
            return ipmi::responseResponseError();
        }

        // both Event Message and Sensor Scanning are disable for VR.
        sensorEventStatus = 0;
        return ipmi::responseSuccess(sensorEventStatus, assertions,
                                     deassertions);
    }

    auto warningInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Warning");
    auto criticalInterface =
        sensorMap.find("xyz.openbmc_project.Sensor.Threshold.Critical");

    std::optional<bool> criticalDeassertHigh =
        thresholdDeassertMap[path]["CriticalAlarmHigh"];
    std::optional<bool> criticalDeassertLow =
        thresholdDeassertMap[path]["CriticalAlarmLow"];
    std::optional<bool> warningDeassertHigh =
        thresholdDeassertMap[path]["WarningAlarmHigh"];
    std::optional<bool> warningDeassertLow =
        thresholdDeassertMap[path]["WarningAlarmLow"];

    if (criticalDeassertHigh && !*criticalDeassertHigh)
    {
        deassertions.set(static_cast<size_t>(
            IPMIGetSensorEventEnableThresholds::upperCriticalGoingHigh));
    }
    if (criticalDeassertLow && !*criticalDeassertLow)
    {
        deassertions.set(static_cast<size_t>(
            IPMIGetSensorEventEnableThresholds::upperCriticalGoingLow));
    }
    if (warningDeassertHigh && !*warningDeassertHigh)
    {
        deassertions.set(static_cast<size_t>(
            IPMIGetSensorEventEnableThresholds::upperNonCriticalGoingHigh));
    }
    if (warningDeassertLow && !*warningDeassertLow)
    {
        deassertions.set(static_cast<size_t>(
            IPMIGetSensorEventEnableThresholds::lowerNonCriticalGoingHigh));
    }
    if ((warningInterface != sensorMap.end()) ||
        (criticalInterface != sensorMap.end()))
    {
        sensorEventStatus = static_cast<size_t>(
            IPMISensorEventEnableByte2::eventMessagesEnable);
        if (warningInterface != sensorMap.end())
        {
            auto& warningMap = warningInterface->second;

            auto warningHigh = warningMap.find("WarningAlarmHigh");
            auto warningLow = warningMap.find("WarningAlarmLow");
            auto warningHighAlarm = false;
            auto warningLowAlarm = false;

            if (warningHigh != warningMap.end())
            {
                warningHighAlarm = std::get<bool>(warningHigh->second);
            }
            if (warningLow != warningMap.end())
            {
                warningLowAlarm = std::get<bool>(warningLow->second);
            }
            if (warningHighAlarm)
            {
                assertions.set(
                    static_cast<size_t>(IPMIGetSensorEventEnableThresholds::
                                            upperNonCriticalGoingHigh));
            }
            if (warningLowAlarm)
            {
                assertions.set(
                    static_cast<size_t>(IPMIGetSensorEventEnableThresholds::
                                            lowerNonCriticalGoingLow));
            }
        }
        if (criticalInterface != sensorMap.end())
        {
            auto& criticalMap = criticalInterface->second;

            auto criticalHigh = criticalMap.find("CriticalAlarmHigh");
            auto criticalLow = criticalMap.find("CriticalAlarmLow");
            auto criticalHighAlarm = false;
            auto criticalLowAlarm = false;

            if (criticalHigh != criticalMap.end())
            {
                criticalHighAlarm = std::get<bool>(criticalHigh->second);
            }
            if (criticalLow != criticalMap.end())
            {
                criticalLowAlarm = std::get<bool>(criticalLow->second);
            }
            if (criticalHighAlarm)
            {
                assertions.set(
                    static_cast<size_t>(IPMIGetSensorEventEnableThresholds::
                                            upperCriticalGoingHigh));
            }
            if (criticalLowAlarm)
            {
                assertions.set(static_cast<size_t>(
                    IPMIGetSensorEventEnableThresholds::lowerCriticalGoingLow));
            }
        }
    }

    return ipmi::responseSuccess(sensorEventStatus, assertions, deassertions);
}

// Construct a type 1 SDR for threshold sensor.
void constructSensorSdrHeaderKey(uint16_t sensorNum, uint16_t recordID,
                                 get_sdr::SensorDataFullRecord& record)
{
    get_sdr::header::set_record_id(
        recordID, reinterpret_cast<get_sdr::SensorDataRecordHeader*>(&record));

    uint8_t sensornumber = static_cast<uint8_t>(sensorNum);
    uint8_t lun = static_cast<uint8_t>(sensorNum >> 8);

    record.header.sdr_version = ipmiSdrVersion;
    record.header.record_type = get_sdr::SENSOR_DATA_FULL_RECORD;
    record.header.record_length = sizeof(get_sdr::SensorDataFullRecord) -
                                  sizeof(get_sdr::SensorDataRecordHeader);
    record.key.owner_id = bmcI2CAddr;
    record.key.owner_lun = lun;
    record.key.sensor_number = sensornumber;
}
bool constructSensorSdr(ipmi::Context::ptr ctx, uint16_t sensorNum,
                        uint16_t recordID, const std::string& service,
                        const std::string& path,
                        get_sdr::SensorDataFullRecord& record)
{
    uint8_t sensornumber = static_cast<uint8_t>(sensorNum);
    constructSensorSdrHeaderKey(sensorNum, recordID, record);

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, service, path, sensorMap, sensorMapSdrUpdatePeriod))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Failed to update sensor map for threshold sensor",
            phosphor::logging::entry("SERVICE=%s", service.c_str()),
            phosphor::logging::entry("PATH=%s", path.c_str()));
        return false;
    }

    record.body.sensor_capabilities = 0x68; // auto rearm - todo hysteresis
    record.body.sensor_type = getSensorTypeFromPath(path);
    std::string type = getSensorTypeStringFromPath(path);
    auto typeCstr = type.c_str();
    auto findUnits = sensorUnits.find(typeCstr);
    if (findUnits != sensorUnits.end())
    {
        record.body.sensor_units_2_base =
            static_cast<uint8_t>(findUnits->second);
    } // else default 0x0 unspecified

    record.body.event_reading_type = getSensorEventTypeFromPath(path);

    auto sensorObject = sensorMap.find(sensor::sensorInterface);
    if (sensorObject == sensorMap.end())
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: sensorObject error");
        return false;
    }

    uint8_t entityId = 0;
    uint8_t entityInstance = 0x01;

    // follow the association chain to get the parent board's entityid and
    // entityInstance
    updateIpmiFromAssociation(path, sensorMap, entityId, entityInstance);

    record.body.entity_id = entityId;
    record.body.entity_instance = entityInstance;

    double max = 0;
    double min = 0;
    getSensorMaxMin(sensorMap, max, min);

    int16_t mValue = 0;
    int8_t rExp = 0;
    int16_t bValue = 0;
    int8_t bExp = 0;
    bool bSigned = false;

    if (!getSensorAttributes(max, min, mValue, rExp, bValue, bExp, bSigned))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: getSensorAttributes error");
        return false;
    }

    // The record.body is a struct SensorDataFullRecordBody
    // from sensorhandler.hpp in phosphor-ipmi-host.
    // The meaning of these bits appears to come from
    // table 43.1 of the IPMI spec.
    // The above 5 sensor attributes are stuffed in as follows:
    // Byte 21 = AA000000 = analog interpretation, 10 signed, 00 unsigned
    // Byte 22-24 are for other purposes
    // Byte 25 = MMMMMMMM = LSB of M
    // Byte 26 = MMTTTTTT = MSB of M (signed), and Tolerance
    // Byte 27 = BBBBBBBB = LSB of B
    // Byte 28 = BBAAAAAA = MSB of B (signed), and LSB of Accuracy
    // Byte 29 = AAAAEE00 = MSB of Accuracy, exponent of Accuracy
    // Byte 30 = RRRRBBBB = rExp (signed), bExp (signed)

    // apply M, B, and exponents, M and B are 10 bit values, exponents are 4
    record.body.m_lsb = mValue & 0xFF;

    uint8_t mBitSign = (mValue < 0) ? 1 : 0;
    uint8_t mBitNine = (mValue & 0x0100) >> 8;

    // move the smallest bit of the MSB into place (bit 9)
    // the MSbs are bits 7:8 in m_msb_and_tolerance
    record.body.m_msb_and_tolerance = (mBitSign << 7) | (mBitNine << 6);

    record.body.b_lsb = bValue & 0xFF;

    uint8_t bBitSign = (bValue < 0) ? 1 : 0;
    uint8_t bBitNine = (bValue & 0x0100) >> 8;

    // move the smallest bit of the MSB into place (bit 9)
    // the MSbs are bits 7:8 in b_msb_and_accuracy_lsb
    record.body.b_msb_and_accuracy_lsb = (bBitSign << 7) | (bBitNine << 6);

    uint8_t rExpSign = (rExp < 0) ? 1 : 0;
    uint8_t rExpBits = rExp & 0x07;

    uint8_t bExpSign = (bExp < 0) ? 1 : 0;
    uint8_t bExpBits = bExp & 0x07;

    // move rExp and bExp into place
    record.body.r_b_exponents =
        (rExpSign << 7) | (rExpBits << 4) | (bExpSign << 3) | bExpBits;

    // Set the analog reading byte interpretation accordingly
    record.body.sensor_units_1 = (bSigned ? 1 : 0) << 7;

    // TODO(): Perhaps care about Tolerance, Accuracy, and so on
    // These seem redundant, but derivable from the above 5 attributes
    // Original comment said "todo fill out rest of units"

    // populate sensor name from path
    auto name = sensor::parseSdrIdFromPath(path);
    record.body.id_string_info = name.size();
    std::strncpy(record.body.id_string, name.c_str(),
                 sizeof(record.body.id_string));

    // Remember the sensor name, as determined for this sensor number
    details::sdrStatsTable.updateName(sensornumber, name);

    bool sensorSettable = false;
    auto mutability =
        sensorMap.find("xyz.openbmc_project.Sensor.ValueMutability");
    if (mutability != sensorMap.end())
    {
        sensorSettable =
            mappedVariant<bool>(mutability->second, "Mutable", false);
    }
    get_sdr::body::init_settable_state(sensorSettable, &record.body);

    // Grant write permission to sensors deemed externally settable
    details::sdrWriteTable.setWritePermission(sensornumber, sensorSettable);

    IPMIThresholds thresholdData;
    try
    {
        thresholdData = getIPMIThresholds(sensorMap);
    }
    catch (const std::exception&)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: getIPMIThresholds error");
        return false;
    }

    if (thresholdData.criticalHigh)
    {
        record.body.upper_critical_threshold = *thresholdData.criticalHigh;
        record.body.supported_deassertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::criticalThreshold);
        record.body.supported_deassertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::upperCriticalGoingHigh);
        record.body.supported_assertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::upperCriticalGoingHigh);
        record.body.discrete_reading_setting_mask[0] |=
            static_cast<uint8_t>(IPMISensorReadingByte3::upperCritical);
    }
    if (thresholdData.warningHigh)
    {
        record.body.upper_noncritical_threshold = *thresholdData.warningHigh;
        record.body.supported_deassertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::nonCriticalThreshold);
        record.body.supported_deassertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::upperNonCriticalGoingHigh);
        record.body.supported_assertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::upperNonCriticalGoingHigh);
        record.body.discrete_reading_setting_mask[0] |=
            static_cast<uint8_t>(IPMISensorReadingByte3::upperNonCritical);
    }
    if (thresholdData.criticalLow)
    {
        record.body.lower_critical_threshold = *thresholdData.criticalLow;
        record.body.supported_assertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::criticalThreshold);
        record.body.supported_deassertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::lowerCriticalGoingLow);
        record.body.supported_assertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::lowerCriticalGoingLow);
        record.body.discrete_reading_setting_mask[0] |=
            static_cast<uint8_t>(IPMISensorReadingByte3::lowerCritical);
    }
    if (thresholdData.warningLow)
    {
        record.body.lower_noncritical_threshold = *thresholdData.warningLow;
        record.body.supported_assertions[1] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::nonCriticalThreshold);
        record.body.supported_deassertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::lowerNonCriticalGoingLow);
        record.body.supported_assertions[0] |= static_cast<uint8_t>(
            IPMISensorEventEnableThresholds::lowerNonCriticalGoingLow);
        record.body.discrete_reading_setting_mask[0] |=
            static_cast<uint8_t>(IPMISensorReadingByte3::lowerNonCritical);
    }

    // everything that is readable is setable
    record.body.discrete_reading_setting_mask[1] =
        record.body.discrete_reading_setting_mask[0];
    return true;
}

#ifdef FEATURE_HYBRID_SENSORS
// Construct a type 1 SDR for discrete Sensor typed sensor.
void constructStaticSensorSdr(ipmi::Context::ptr ctx, uint16_t sensorNum,
                              uint16_t recordID,
                              ipmi::sensor::IdInfoMap::const_iterator sensor,
                              get_sdr::SensorDataFullRecord& record)
{
    constructSensorSdrHeaderKey(sensorNum, recordID, record);

    record.body.entity_id = sensor->second.entityType;
    record.body.sensor_type = sensor->second.sensorType;
    record.body.event_reading_type = sensor->second.sensorReadingType;
    record.body.entity_instance = sensor->second.instance;
    if (ipmi::sensor::Mutability::Write ==
        (sensor->second.mutability & ipmi::sensor::Mutability::Write))
    {
        get_sdr::body::init_settable_state(true, &(record.body));
    }

    auto id_string = sensor->second.sensorName;

    if (id_string.empty())
    {
        id_string = sensor->second.sensorNameFunc(sensor->second);
    }

    if (id_string.length() > FULL_RECORD_ID_STR_MAX_LENGTH)
    {
        get_sdr::body::set_id_strlen(FULL_RECORD_ID_STR_MAX_LENGTH,
                                     &(record.body));
    }
    else
    {
        get_sdr::body::set_id_strlen(id_string.length(), &(record.body));
    }
    std::strncpy(record.body.id_string, id_string.c_str(),
                 get_sdr::body::get_id_strlen(&(record.body)));
}
#endif

// Construct type 3 SDR header and key (for VR and other discrete sensors)
void constructEventSdrHeaderKey(uint16_t sensorNum, uint16_t recordID,
                                get_sdr::SensorDataEventRecord& record)
{
    uint8_t sensornumber = static_cast<uint8_t>(sensorNum);
    uint8_t lun = static_cast<uint8_t>(sensorNum >> 8);

    get_sdr::header::set_record_id(
        recordID, reinterpret_cast<get_sdr::SensorDataRecordHeader*>(&record));

    record.header.sdr_version = ipmiSdrVersion;
    record.header.record_type = get_sdr::SENSOR_DATA_EVENT_RECORD;
    record.header.record_length = sizeof(get_sdr::SensorDataEventRecord) -
                                  sizeof(get_sdr::SensorDataRecordHeader);
    record.key.owner_id = bmcI2CAddr;
    record.key.owner_lun = lun;
    record.key.sensor_number = sensornumber;

    record.body.entity_id = 0x00;
    record.body.entity_instance = 0x01;
}

// Construct a type 3 SDR for VR typed sensor(daemon).
bool constructVrSdr(ipmi::Context::ptr ctx, uint16_t sensorNum,
                    uint16_t recordID, const std::string& service,
                    const std::string& path,
                    get_sdr::SensorDataEventRecord& record)
{
    uint8_t sensornumber = static_cast<uint8_t>(sensorNum);
    constructEventSdrHeaderKey(sensorNum, recordID, record);

    DbusInterfaceMap sensorMap;
    if (!getSensorMap(ctx, service, path, sensorMap, sensorMapSdrUpdatePeriod))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Failed to update sensor map for VR sensor",
            phosphor::logging::entry("SERVICE=%s", service.c_str()),
            phosphor::logging::entry("PATH=%s", path.c_str()));
        return false;
    }
    // follow the association chain to get the parent board's entityid and
    // entityInstance
    updateIpmiFromAssociation(path, sensorMap, record.body.entity_id,
                              record.body.entity_instance);

    // Sensor type is hardcoded as a module/board type instead of parsing from
    // sensor path. This is because VR control is allocated in an independent
    // path(/xyz/openbmc_project/vr/profile/...) which is not categorized by
    // types.
    static constexpr const uint8_t module_board_type = 0x15;
    record.body.sensor_type = module_board_type;
    record.body.event_reading_type = 0x00;

    record.body.sensor_record_sharing_1 = 0x00;
    record.body.sensor_record_sharing_2 = 0x00;

    // populate sensor name from path
    auto name = sensor::parseSdrIdFromPath(path);
    int nameSize = std::min(name.size(), sizeof(record.body.id_string));
    record.body.id_string_info = nameSize;
    std::memset(record.body.id_string, 0x00, sizeof(record.body.id_string));
    std::memcpy(record.body.id_string, name.c_str(), nameSize);

    // Remember the sensor name, as determined for this sensor number
    details::sdrStatsTable.updateName(sensornumber, name);

    return true;
}

static inline uint16_t getNumberOfSensors()
{
    return std::min(getSensorTree().size(), maxIPMISensors);
}

static int
    getSensorDataRecord(ipmi::Context::ptr ctx,
                        std::vector<uint8_t>& recordData, uint16_t recordID,
                        uint8_t readBytes = std::numeric_limits<uint8_t>::max())
{
    size_t fruCount = 0;
    ipmi::Cc ret = ipmi::storage::getFruSdrCount(ctx, fruCount);
    if (ret != ipmi::ccSuccess)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: getFruSdrCount error");
        return GENERAL_ERROR;
    }

    size_t lastRecord =
        getNumberOfSensors() + fruCount + ipmi::storage::type12Count - 1;
    if (recordID == lastRecordIndex)
    {
        recordID = lastRecord;
    }
    if (recordID > lastRecord)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: recordID > lastRecord error");
        return GENERAL_ERROR;
    }

    if (recordID >= getNumberOfSensors())
    {
        size_t fruIndex = recordID - getNumberOfSensors();

        if (fruIndex >= fruCount)
        {
            // handle type 12 hardcoded records
            size_t type12Index = fruIndex - fruCount;
            if (type12Index >= ipmi::storage::type12Count)
            {
                phosphor::logging::log<phosphor::logging::level::ERR>(
                    "getSensorDataRecord: type12Index error");
                return GENERAL_ERROR;
            }
            recordData = ipmi::storage::getType12SDRs(type12Index, recordID);
        }
        else
        {
            // handle fru records
            get_sdr::SensorDataFruRecord data;
            ret = ipmi::storage::getFruSdrs(ctx, fruIndex, data);
            if (ret != IPMI_CC_OK)
            {
                return GENERAL_ERROR;
            }
            data.header.record_id_msb = recordID >> 8;
            data.header.record_id_lsb = recordID & 0xFF;
            recordData.insert(recordData.end(), (uint8_t*)&data,
                              ((uint8_t*)&data) + sizeof(data));
        }

        return 0;
    }

    // Perform a incremental scan of the SDR Record ID's and translate the
    // first 765 SDR records (i.e. maxIPMISensors) into IPMI Sensor
    // Numbers. The IPMI sensor numbers are not linear, and have a reserved
    // gap at 0xff. This code creates 254 sensors per LUN, excepting LUN 2
    // which has special meaning.
    std::string connection;
    std::string path;
    std::vector<std::string> interfaces;
    uint16_t sensNumFromRecID{recordID};
    if ((recordID > lun0MaxSensorNum) && (recordID < lun1MaxSensorNum))
    {
        // LUN 0 has one reserved sensor number. Compensate here by adding one
        // to the record ID
        sensNumFromRecID = recordID + 1;
        ctx->lun = 1;
    }
    else if ((recordID >= lun1MaxSensorNum) && (recordID < maxIPMISensors))
    {
        // LUN 0, 1 have a reserved sensor number. Compensate here by adding 2
        // to the record ID. Skip all 256 sensors in LUN 2, as it has special
        // rules governing its use.
        sensNumFromRecID = recordID + (maxSensorsPerLUN + 1) + 2;
        ctx->lun = 3;
    }

    auto status =
        getSensorConnection(ctx, static_cast<uint8_t>(sensNumFromRecID),
                            connection, path, &interfaces);
    if (status)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: getSensorConnection error");
        return GENERAL_ERROR;
    }
    uint16_t sensorNum = getSensorNumberFromPath(path);
    // Return an error on LUN 2 assingments, and any sensor number beyond the
    // range of LUN 3
    if (((sensorNum > lun1MaxSensorNum) && (sensorNum <= maxIPMISensors)) ||
        (sensorNum > lun3MaxSensorNum))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: invalidSensorNumber");
        return GENERAL_ERROR;
    }
    uint8_t sensornumber = static_cast<uint8_t>(sensorNum);
    uint8_t lun = static_cast<uint8_t>(sensorNum >> 8);

    if ((sensornumber != static_cast<uint8_t>(sensNumFromRecID)) &&
        (lun != ctx->lun))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "getSensorDataRecord: sensor record mismatch");
        return GENERAL_ERROR;
    }

    // Construct full record (SDR type 1) for the threshold sensors
    if (std::find(interfaces.begin(), interfaces.end(),
                  sensor::sensorInterface) != interfaces.end())
    {
        get_sdr::SensorDataFullRecord record = {0};

        // If the request doesn't read SDR body, construct only header and key
        // part to avoid additional DBus transaction.
        if (readBytes <= sizeof(record.header) + sizeof(record.key))
        {
            constructSensorSdrHeaderKey(sensorNum, recordID, record);
        }
        else if (!constructSensorSdr(ctx, sensorNum, recordID, connection, path,
                                     record))
        {
            return GENERAL_ERROR;
        }

        recordData.insert(recordData.end(), (uint8_t*)&record,
                          ((uint8_t*)&record) + sizeof(record));

        return 0;
    }

#ifdef FEATURE_HYBRID_SENSORS
    if (auto sensor = findStaticSensor(path);
        sensor != ipmi::sensor::sensors.end() &&
        getSensorEventTypeFromPath(path) !=
            static_cast<uint8_t>(SensorEventTypeCodes::threshold))
    {
        get_sdr::SensorDataFullRecord record = {0};

        // If the request doesn't read SDR body, construct only header and key
        // part to avoid additional DBus transaction.
        if (readBytes <= sizeof(record.header) + sizeof(record.key))
        {
            constructSensorSdrHeaderKey(sensorNum, recordID, record);
        }
        else
        {
            constructStaticSensorSdr(ctx, sensorNum, recordID, sensor, record);
        }

        recordData.insert(recordData.end(), (uint8_t*)&record,
                          ((uint8_t*)&record) + sizeof(record));

        return 0;
    }
#endif

    // Contruct SDR type 3 record for VR sensor (daemon)
    if (std::find(interfaces.begin(), interfaces.end(), sensor::vrInterface) !=
        interfaces.end())
    {
        get_sdr::SensorDataEventRecord record = {0};

        // If the request doesn't read SDR body, construct only header and key
        // part to avoid additional DBus transaction.
        if (readBytes <= sizeof(record.header) + sizeof(record.key))
        {
            constructEventSdrHeaderKey(sensorNum, recordID, record);
        }
        else if (!constructVrSdr(ctx, sensorNum, recordID, connection, path,
                                 record))
        {
            return GENERAL_ERROR;
        }
        recordData.insert(recordData.end(), (uint8_t*)&record,
                          ((uint8_t*)&record) + sizeof(record));
    }

    return 0;
}

/** @brief implements the get SDR Info command
 *  @param count - Operation
 *
 *  @returns IPMI completion code plus response data
 *   - sdrCount - sensor/SDR count
 *   - lunsAndDynamicPopulation - static/Dynamic sensor population flag
 */
static ipmi::RspType<uint8_t, // respcount
                     uint8_t, // dynamic population flags
                     uint32_t // last time a sensor was added
                     >
    ipmiSensorGetDeviceSdrInfo(ipmi::Context::ptr ctx,
                               std::optional<uint8_t> count)
{
    auto& sensorTree = getSensorTree();
    uint8_t sdrCount = 0;
    uint16_t recordID = 0;
    std::vector<uint8_t> record;
    // Sensors are dynamically allocated, and there is at least one LUN
    uint8_t lunsAndDynamicPopulation = 0x80;
    constexpr uint8_t getSdrCount = 0x01;
    constexpr uint8_t getSensorCount = 0x00;

    if (!getSensorSubtree(sensorTree) || sensorTree.empty())
    {
        return ipmi::responseResponseError();
    }
    uint16_t numSensors = getNumberOfSensors();
    if (count.value_or(0) == getSdrCount)
    {
        // Count the number of Type 1 SDR entries assigned to the LUN
        while (!getSensorDataRecord(ctx, record, recordID++))
        {
            get_sdr::SensorDataRecordHeader* hdr =
                reinterpret_cast<get_sdr::SensorDataRecordHeader*>(
                    record.data());
            if (hdr && hdr->record_type == get_sdr::SENSOR_DATA_FULL_RECORD)
            {
                get_sdr::SensorDataFullRecord* recordData =
                    reinterpret_cast<get_sdr::SensorDataFullRecord*>(
                        record.data());
                if (ctx->lun == recordData->key.owner_lun)
                {
                    sdrCount++;
                }
            }
        }
    }
    else if (count.value_or(0) == getSensorCount)
    {
        // Return the number of sensors attached to the LUN
        if ((ctx->lun == 0) && (numSensors > 0))
        {
            sdrCount =
                (numSensors > maxSensorsPerLUN) ? maxSensorsPerLUN : numSensors;
        }
        else if ((ctx->lun == 1) && (numSensors > maxSensorsPerLUN))
        {
            sdrCount = (numSensors > (2 * maxSensorsPerLUN))
                           ? maxSensorsPerLUN
                           : (numSensors - maxSensorsPerLUN) & maxSensorsPerLUN;
        }
        else if (ctx->lun == 3)
        {
            if (numSensors <= maxIPMISensors)
            {
                sdrCount =
                    (numSensors - (2 * maxSensorsPerLUN)) & maxSensorsPerLUN;
            }
            else
            {
                // error
                throw std::out_of_range(
                    "Maximum number of IPMI sensors exceeded.");
            }
        }
    }
    else
    {
        return ipmi::responseInvalidFieldRequest();
    }

    // Get Sensor count. This returns the number of sensors
    if (numSensors > 0)
    {
        lunsAndDynamicPopulation |= 1;
    }
    if (numSensors > maxSensorsPerLUN)
    {
        lunsAndDynamicPopulation |= 2;
    }
    if (numSensors >= (maxSensorsPerLUN * 2))
    {
        lunsAndDynamicPopulation |= 8;
    }
    if (numSensors > maxIPMISensors)
    {
        // error
        throw std::out_of_range("Maximum number of IPMI sensors exceeded.");
    }

    return ipmi::responseSuccess(sdrCount, lunsAndDynamicPopulation,
                                 sdrLastAdd);
}

/* end sensor commands */

/* storage commands */

ipmi::RspType<uint8_t,  // sdr version
              uint16_t, // record count
              uint16_t, // free space
              uint32_t, // most recent addition
              uint32_t, // most recent erase
              uint8_t   // operationSupport
              >
    ipmiStorageGetSDRRepositoryInfo(ipmi::Context::ptr ctx)
{
    auto& sensorTree = getSensorTree();
    constexpr const uint16_t unspecifiedFreeSpace = 0xFFFF;
    if (!getSensorSubtree(sensorTree) && sensorTree.empty())
    {
        return ipmi::responseResponseError();
    }

    size_t fruCount = 0;
    ipmi::Cc ret = ipmi::storage::getFruSdrCount(ctx, fruCount);
    if (ret != ipmi::ccSuccess)
    {
        return ipmi::response(ret);
    }

    uint16_t recordCount =
        getNumberOfSensors() + fruCount + ipmi::storage::type12Count;

    uint8_t operationSupport = static_cast<uint8_t>(
        SdrRepositoryInfoOps::overflow); // write not supported

    operationSupport |=
        static_cast<uint8_t>(SdrRepositoryInfoOps::allocCommandSupported);
    operationSupport |= static_cast<uint8_t>(
        SdrRepositoryInfoOps::reserveSDRRepositoryCommandSupported);
    return ipmi::responseSuccess(ipmiSdrVersion, recordCount,
                                 unspecifiedFreeSpace, sdrLastAdd,
                                 sdrLastRemove, operationSupport);
}

/** @brief implements the get SDR allocation info command
 *
 *  @returns IPMI completion code plus response data
 *   - allocUnits    - Number of possible allocation units
 *   - allocUnitSize - Allocation unit size in bytes.
 *   - allocUnitFree - Number of free allocation units
 *   - allocUnitLargestFree - Largest free block in allocation units
 *   - maxRecordSize    - Maximum record size in allocation units.
 */
ipmi::RspType<uint16_t, // allocUnits
              uint16_t, // allocUnitSize
              uint16_t, // allocUnitFree
              uint16_t, // allocUnitLargestFree
              uint8_t   // maxRecordSize
              >
    ipmiStorageGetSDRAllocationInfo()
{
    // 0000h unspecified number of alloc units
    constexpr uint16_t allocUnits = 0;

    constexpr uint16_t allocUnitFree = 0;
    constexpr uint16_t allocUnitLargestFree = 0;
    // only allow one block at a time
    constexpr uint8_t maxRecordSize = 1;

    return ipmi::responseSuccess(allocUnits, maxSDRTotalSize, allocUnitFree,
                                 allocUnitLargestFree, maxRecordSize);
}

/** @brief implements the reserve SDR command
 *  @returns IPMI completion code plus response data
 *   - sdrReservationID
 */
ipmi::RspType<uint16_t> ipmiStorageReserveSDR()
{
    sdrReservationID++;
    if (sdrReservationID == 0)
    {
        sdrReservationID++;
    }

    return ipmi::responseSuccess(sdrReservationID);
}

ipmi::RspType<uint16_t,            // next record ID
              std::vector<uint8_t> // payload
              >
    ipmiStorageGetSDR(ipmi::Context::ptr ctx, uint16_t reservationID,
                      uint16_t recordID, uint8_t offset, uint8_t bytesToRead)
{
    size_t fruCount = 0;
    // reservation required for partial reads with non zero offset into
    // record
    if ((sdrReservationID == 0 || reservationID != sdrReservationID) && offset)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: responseInvalidReservationId");
        return ipmi::responseInvalidReservationId();
    }
    ipmi::Cc ret = ipmi::storage::getFruSdrCount(ctx, fruCount);
    if (ret != ipmi::ccSuccess)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: getFruSdrCount error");
        return ipmi::response(ret);
    }

    auto& sensorTree = getSensorTree();
    size_t lastRecord =
        getNumberOfSensors() + fruCount + ipmi::storage::type12Count - 1;
    uint16_t nextRecordId = lastRecord > recordID ? recordID + 1 : 0XFFFF;

    if (!getSensorSubtree(sensorTree) && sensorTree.empty())
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: getSensorSubtree error");
        return ipmi::responseResponseError();
    }

    std::vector<uint8_t> record;
    if (getSensorDataRecord(ctx, record, recordID, offset + bytesToRead))
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: fail to get SDR");
        return ipmi::responseInvalidFieldRequest();
    }
    get_sdr::SensorDataRecordHeader* hdr =
        reinterpret_cast<get_sdr::SensorDataRecordHeader*>(record.data());
    if (!hdr)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: record header is null");
        return ipmi::responseSuccess(nextRecordId, record);
    }

    size_t sdrLength =
        sizeof(get_sdr::SensorDataRecordHeader) + hdr->record_length;
    if (sdrLength < (offset + bytesToRead))
    {
        bytesToRead = sdrLength - offset;
    }

    uint8_t* respStart = reinterpret_cast<uint8_t*>(hdr) + offset;
    if (!respStart)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "ipmiStorageGetSDR: record is null");
        return ipmi::responseSuccess(nextRecordId, record);
    }

    std::vector<uint8_t> recordData(respStart, respStart + bytesToRead);

    return ipmi::responseSuccess(nextRecordId, recordData);
}
/* end storage commands */

void registerSensorFunctions()
{
    // <Platform Event>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdPlatformEvent,
                          ipmi::Privilege::Operator, ipmiSenPlatformEvent);

    // <Set Sensor Reading and Event Status>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdSetSensorReadingAndEvtSts,
                          ipmi::Privilege::Operator, ipmiSetSensorReading);

    // <Get Sensor Reading>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetSensorReading,
                          ipmi::Privilege::User, ipmiSenGetSensorReading);

    // <Get Sensor Threshold>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetSensorThreshold,
                          ipmi::Privilege::User, ipmiSenGetSensorThresholds);

    // <Set Sensor Threshold>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdSetSensorThreshold,
                          ipmi::Privilege::Operator,
                          ipmiSenSetSensorThresholds);

    // <Get Sensor Event Enable>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetSensorEventEnable,
                          ipmi::Privilege::User, ipmiSenGetSensorEventEnable);

    // <Get Sensor Event Status>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetSensorEventStatus,
                          ipmi::Privilege::User, ipmiSenGetSensorEventStatus);

    // register all storage commands for both Sensor and Storage command
    // versions

    // <Get SDR Repository Info>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnStorage,
                          ipmi::storage::cmdGetSdrRepositoryInfo,
                          ipmi::Privilege::User,
                          ipmiStorageGetSDRRepositoryInfo);

    // <Get Device SDR Info>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetDeviceSdrInfo,
                          ipmi::Privilege::User, ipmiSensorGetDeviceSdrInfo);

    // <Get SDR Allocation Info>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnStorage,
                          ipmi::storage::cmdGetSdrRepositoryAllocInfo,
                          ipmi::Privilege::User,
                          ipmiStorageGetSDRAllocationInfo);

    // <Reserve SDR Repo>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdReserveDeviceSdrRepository,
                          ipmi::Privilege::User, ipmiStorageReserveSDR);

    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnStorage,
                          ipmi::storage::cmdReserveSdrRepository,
                          ipmi::Privilege::User, ipmiStorageReserveSDR);

    // <Get Sdr>
    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnSensor,
                          ipmi::sensor_event::cmdGetDeviceSdr,
                          ipmi::Privilege::User, ipmiStorageGetSDR);

    ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnStorage,
                          ipmi::storage::cmdGetSdr, ipmi::Privilege::User,
                          ipmiStorageGetSDR);
}
} // namespace ipmi