#include "dcmihandler.hpp"
#include "host-ipmid/ipmid-api.h"
#include <phosphor-logging/elog-errors.hpp>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/bus.hpp>
#include "utils.hpp"
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <fstream>
#include <bitset>
#include <cmath>
#include "xyz/openbmc_project/Common/error.hpp"

using namespace phosphor::logging;
using InternalFailure =
        sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;

void register_netfn_dcmi_functions() __attribute__((constructor));

constexpr auto PCAP_PATH    = "/xyz/openbmc_project/control/host0/power_cap";
constexpr auto PCAP_INTERFACE = "xyz.openbmc_project.Control.Power.Cap";

constexpr auto POWER_CAP_PROP = "PowerCap";
constexpr auto POWER_CAP_ENABLE_PROP = "PowerCapEnable";

constexpr auto DCMI_PARAMETER_REVISION = 2;
constexpr auto DCMI_SPEC_MAJOR_VERSION = 1;
constexpr auto DCMI_SPEC_MINOR_VERSION = 5;
constexpr auto DCMI_CAP_JSON_FILE = "/usr/share/ipmi-providers/dcmi_cap.json";

using namespace phosphor::logging;

namespace dcmi
{

uint32_t getPcap(sdbusplus::bus::bus& bus)
{
    auto settingService = ipmi::getService(bus,
                                           PCAP_INTERFACE,PCAP_PATH);

    auto method = bus.new_method_call(settingService.c_str(),
                                      PCAP_PATH,
                                      "org.freedesktop.DBus.Properties",
                                      "Get");

    method.append(PCAP_INTERFACE, POWER_CAP_PROP);
    auto reply = bus.call(method);

    if (reply.is_method_error())
    {
        log<level::ERR>("Error in getPcap prop");
        elog<InternalFailure>();
    }
    sdbusplus::message::variant<uint32_t> pcap;
    reply.read(pcap);

    return pcap.get<uint32_t>();
}

bool getPcapEnabled(sdbusplus::bus::bus& bus)
{
    auto settingService = ipmi::getService(bus,
                                           PCAP_INTERFACE,PCAP_PATH);

    auto method = bus.new_method_call(settingService.c_str(),
                                      PCAP_PATH,
                                      "org.freedesktop.DBus.Properties",
                                      "Get");

    method.append(PCAP_INTERFACE, POWER_CAP_ENABLE_PROP);
    auto reply = bus.call(method);

    if (reply.is_method_error())
    {
        log<level::ERR>("Error in getPcapEnabled prop");
        elog<InternalFailure>();
    }
    sdbusplus::message::variant<bool> pcapEnabled;
    reply.read(pcapEnabled);

    return pcapEnabled.get<bool>();
}

void setPcap(sdbusplus::bus::bus& bus, const uint32_t powerCap)
{
    auto service = ipmi::getService(bus, PCAP_INTERFACE, PCAP_PATH);

    auto method = bus.new_method_call(service.c_str(),
                                      PCAP_PATH,
                                      "org.freedesktop.DBus.Properties",
                                      "Set");

    method.append(PCAP_INTERFACE, POWER_CAP_PROP);
    method.append(sdbusplus::message::variant<uint32_t>(powerCap));

    auto reply = bus.call(method);

    if (reply.is_method_error())
    {
        log<level::ERR>("Error in setPcap property");
        elog<InternalFailure>();
    }
}

void setPcapEnable(sdbusplus::bus::bus& bus, bool enabled)
{
    auto service = ipmi::getService(bus, PCAP_INTERFACE, PCAP_PATH);

    auto method = bus.new_method_call(service.c_str(),
                                      PCAP_PATH,
                                      "org.freedesktop.DBus.Properties",
                                      "Set");

    method.append(PCAP_INTERFACE, POWER_CAP_ENABLE_PROP);
    method.append(sdbusplus::message::variant<bool>(enabled));

    auto reply = bus.call(method);

    if (reply.is_method_error())
    {
        log<level::ERR>("Error in setPcapEnabled property");
        elog<InternalFailure>();
    }
}

void readAssetTagObjectTree(dcmi::assettag::ObjectTree& objectTree)
{
    static constexpr auto mapperBusName = "xyz.openbmc_project.ObjectMapper";
    static constexpr auto mapperObjPath = "/xyz/openbmc_project/object_mapper";
    static constexpr auto mapperIface = "xyz.openbmc_project.ObjectMapper";
    static constexpr auto inventoryRoot = "/xyz/openbmc_project/inventory/";

    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
    auto depth = 0;

    auto mapperCall = bus.new_method_call(mapperBusName,
                                          mapperObjPath,
                                          mapperIface,
                                          "GetSubTree");

    mapperCall.append(inventoryRoot);
    mapperCall.append(depth);
    mapperCall.append(std::vector<std::string>({dcmi::assetTagIntf}));

    auto mapperReply = bus.call(mapperCall);
    if (mapperReply.is_method_error())
    {
        log<level::ERR>("Error in mapper call");
        elog<InternalFailure>();
    }

    mapperReply.read(objectTree);

    if (objectTree.empty())
    {
        log<level::ERR>("AssetTag property is not populated");
        elog<InternalFailure>();
    }
}

std::string readAssetTag()
{
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
    dcmi::assettag::ObjectTree objectTree;

    // Read the object tree with the inventory root to figure out the object
    // that has implemented the Asset tag interface.
    readAssetTagObjectTree(objectTree);

    auto method = bus.new_method_call(
            (objectTree.begin()->second.begin()->first).c_str(),
            (objectTree.begin()->first).c_str(),
            dcmi::propIntf,
            "Get");
    method.append(dcmi::assetTagIntf);
    method.append(dcmi::assetTagProp);

    auto reply = bus.call(method);
    if (reply.is_method_error())
    {
        log<level::ERR>("Error in reading asset tag");
        elog<InternalFailure>();
    }

    sdbusplus::message::variant<std::string> assetTag;
    reply.read(assetTag);

    return assetTag.get<std::string>();
}

void writeAssetTag(const std::string& assetTag)
{
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
    dcmi::assettag::ObjectTree objectTree;

    // Read the object tree with the inventory root to figure out the object
    // that has implemented the Asset tag interface.
    readAssetTagObjectTree(objectTree);

    auto method = bus.new_method_call(
            (objectTree.begin()->second.begin()->first).c_str(),
            (objectTree.begin()->first).c_str(),
            dcmi::propIntf,
            "Set");
    method.append(dcmi::assetTagIntf);
    method.append(dcmi::assetTagProp);
    method.append(sdbusplus::message::variant<std::string>(assetTag));

    auto reply = bus.call(method);
    if (reply.is_method_error())
    {
        log<level::ERR>("Error in writing asset tag");
        elog<InternalFailure>();
    }
}

std::string getHostName(void)
{
    sdbusplus::bus::bus bus{ ipmid_get_sd_bus_connection() };

    auto service = ipmi::getService(bus, networkConfigIntf, networkConfigObj);
    auto value = ipmi::getDbusProperty(bus, service,
        networkConfigObj, networkConfigIntf, hostNameProp);

    return value.get<std::string>();
}

} // namespace dcmi

ipmi_ret_t getPowerLimit(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                         ipmi_request_t request, ipmi_response_t response,
                         ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::GetPowerLimitRequest*>
                   (request);
    std::vector<uint8_t> outPayload(sizeof(dcmi::GetPowerLimitResponse));
    auto responseData = reinterpret_cast<dcmi::GetPowerLimitResponse*>
            (outPayload.data());

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    sdbusplus::bus::bus sdbus {ipmid_get_sd_bus_connection()};
    uint32_t pcapValue = 0;
    bool pcapEnable = false;

    try
    {
        pcapValue = dcmi::getPcap(sdbus);
        pcapEnable = dcmi::getPcapEnabled(sdbus);
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    responseData->groupID = dcmi::groupExtId;

    /*
     * Exception action if power limit is exceeded and cannot be controlled
     * with the correction time limit is hardcoded to Hard Power Off system
     * and log event to SEL.
     */
    constexpr auto exception = 0x01;
    responseData->exceptionAction = exception;

    responseData->powerLimit = static_cast<uint16_t>(pcapValue);

    /*
     * Correction time limit and Statistics sampling period is currently not
     * populated.
     */

    *data_len = outPayload.size();
    memcpy(response, outPayload.data(), *data_len);

    if (pcapEnable)
    {
        return IPMI_CC_OK;
    }
    else
    {
        return IPMI_DCMI_CC_NO_ACTIVE_POWER_LIMIT;
    }
}

ipmi_ret_t setPowerLimit(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                         ipmi_request_t request, ipmi_response_t response,
                         ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::SetPowerLimitRequest*>
                   (request);
    std::vector<uint8_t> outPayload(sizeof(dcmi::SetPowerLimitResponse));
    auto responseData = reinterpret_cast<dcmi::SetPowerLimitResponse*>
            (outPayload.data());

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    sdbusplus::bus::bus sdbus {ipmid_get_sd_bus_connection()};

    // Only process the power limit requested in watts.
    try
    {
        dcmi::setPcap(sdbus, requestData->powerLimit);
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    log<level::INFO>("Set Power Cap",
                     entry("POWERCAP=%u", requestData->powerLimit));

    responseData->groupID = dcmi::groupExtId;
    memcpy(response, outPayload.data(), outPayload.size());
    *data_len = outPayload.size();

    return IPMI_CC_OK;
}

ipmi_ret_t applyPowerLimit(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                           ipmi_request_t request, ipmi_response_t response,
                           ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::ApplyPowerLimitRequest*>
                   (request);
    std::vector<uint8_t> outPayload(sizeof(dcmi::ApplyPowerLimitResponse));
    auto responseData = reinterpret_cast<dcmi::ApplyPowerLimitResponse*>
            (outPayload.data());

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    sdbusplus::bus::bus sdbus {ipmid_get_sd_bus_connection()};

    try
    {
        dcmi::setPcapEnable(sdbus,
                            static_cast<bool>(requestData->powerLimitAction));
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    log<level::INFO>("Set Power Cap Enable",
                     entry("POWERCAPENABLE=%u", requestData->powerLimitAction));

    responseData->groupID = dcmi::groupExtId;
    memcpy(response, outPayload.data(), outPayload.size());
    *data_len = outPayload.size();

    return IPMI_CC_OK;
}

ipmi_ret_t getAssetTag(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                       ipmi_request_t request, ipmi_response_t response,
                       ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::GetAssetTagRequest*>
                   (request);
    std::vector<uint8_t> outPayload(sizeof(dcmi::GetAssetTagResponse));
    auto responseData = reinterpret_cast<dcmi::GetAssetTagResponse*>
            (outPayload.data());

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    // Verify offset to read and number of bytes to read are not exceeding the
    // range.
    if ((requestData->offset > dcmi::assetTagMaxOffset) ||
        (requestData->bytes > dcmi::maxBytes) ||
        ((requestData->offset + requestData->bytes) > dcmi::assetTagMaxSize))
    {
        *data_len = 0;
        return IPMI_CC_PARM_OUT_OF_RANGE;
    }

    std::string assetTag;

    try
    {
        assetTag = dcmi::readAssetTag();
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    responseData->groupID = dcmi::groupExtId;

    // Return if the asset tag is not populated.
    if (!assetTag.size())
    {
        responseData->tagLength = 0;
        memcpy(response, outPayload.data(), outPayload.size());
        *data_len = outPayload.size();
        return IPMI_CC_OK;
    }

    // If the asset tag is longer than 63 bytes, restrict it to 63 bytes to suit
    // Get Asset Tag command.
    if (assetTag.size() > dcmi::assetTagMaxSize)
    {
        assetTag.resize(dcmi::assetTagMaxSize);
    }

    // If the requested offset is beyond the asset tag size.
    if (requestData->offset >= assetTag.size())
    {
        *data_len = 0;
        return IPMI_CC_PARM_OUT_OF_RANGE;
    }

    auto returnData = assetTag.substr(requestData->offset, requestData->bytes);

    responseData->tagLength = assetTag.size();

    memcpy(response, outPayload.data(), outPayload.size());
    memcpy(static_cast<uint8_t*>(response) + outPayload.size(),
           returnData.data(), returnData.size());
    *data_len = outPayload.size() + returnData.size();

    return IPMI_CC_OK;
}

ipmi_ret_t setAssetTag(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                       ipmi_request_t request, ipmi_response_t response,
                       ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::SetAssetTagRequest*>
                   (request);
    std::vector<uint8_t> outPayload(sizeof(dcmi::SetAssetTagResponse));
    auto responseData = reinterpret_cast<dcmi::SetAssetTagResponse*>
            (outPayload.data());

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    // Verify offset to read and number of bytes to read are not exceeding the
    // range.
    if ((requestData->offset > dcmi::assetTagMaxOffset) ||
        (requestData->bytes > dcmi::maxBytes) ||
        ((requestData->offset + requestData->bytes) > dcmi::assetTagMaxSize))
    {
        *data_len = 0;
        return IPMI_CC_PARM_OUT_OF_RANGE;
    }

    std::string assetTag;

    try
    {
        assetTag = dcmi::readAssetTag();

        if (requestData->offset > assetTag.size())
        {
            *data_len = 0;
            return IPMI_CC_PARM_OUT_OF_RANGE;
        }

        assetTag.replace(requestData->offset,
                         assetTag.size() - requestData->offset,
                         static_cast<const char*>(request) +
                         sizeof(dcmi::SetAssetTagRequest),
                         requestData->bytes);

        dcmi::writeAssetTag(assetTag);

        responseData->groupID = dcmi::groupExtId;
        responseData->tagLength = assetTag.size();
        memcpy(response, outPayload.data(), outPayload.size());
        *data_len = outPayload.size();

        return IPMI_CC_OK;
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }
}

ipmi_ret_t getMgmntCtrlIdStr(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
    ipmi_request_t request, ipmi_response_t response,
    ipmi_data_len_t data_len, ipmi_context_t context)
{
    auto requestData = reinterpret_cast<const dcmi::GetMgmntCtrlIdStrRequest *>
        (request);
    auto responseData = reinterpret_cast<dcmi::GetMgmntCtrlIdStrResponse *>
        (response);
    std::string hostName;

    *data_len = 0;

    if (requestData->groupID != dcmi::groupExtId ||
        requestData->bytes > dcmi::maxBytes ||
        requestData->offset + requestData->bytes > dcmi::maxCtrlIdStrLen)
    {
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    try
    {
        hostName = dcmi::getHostName();
    }
    catch (InternalFailure& e)
    {
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    if (requestData->offset > hostName.length())
    {
        return IPMI_CC_PARM_OUT_OF_RANGE;
    }
    auto responseStr = hostName.substr(requestData->offset, requestData->bytes);
    auto responseStrLen = std::min(static_cast<std::size_t>(requestData->bytes),
        responseStr.length() + 1);
    responseData->groupID = dcmi::groupExtId;
    responseData->strLen = hostName.length();
    std::copy(begin(responseStr), end(responseStr), responseData->data);

    *data_len = sizeof(*responseData) + responseStrLen;
    return IPMI_CC_OK;
}

ipmi_ret_t setMgmntCtrlIdStr(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
    ipmi_request_t request, ipmi_response_t response,
    ipmi_data_len_t data_len, ipmi_context_t context)
{
    static std::array<char, dcmi::maxCtrlIdStrLen + 1> newCtrlIdStr;

    auto requestData = reinterpret_cast<const dcmi::SetMgmntCtrlIdStrRequest *>
        (request);
    auto responseData = reinterpret_cast<dcmi::SetMgmntCtrlIdStrResponse *>
        (response);

    *data_len = 0;

    if (requestData->groupID != dcmi::groupExtId ||
        requestData->bytes > dcmi::maxBytes ||
        requestData->offset + requestData->bytes > dcmi::maxCtrlIdStrLen + 1 ||
        (requestData->offset + requestData->bytes == dcmi::maxCtrlIdStrLen + 1 &&
            requestData->data[requestData->bytes - 1] != '\0'))
    {
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    try
    {
        /* if there is no old value and offset is not 0 */
        if (newCtrlIdStr[0] == '\0' && requestData->offset != 0)
        {
            /* read old ctrlIdStr */
            auto hostName = dcmi::getHostName();
            hostName.resize(dcmi::maxCtrlIdStrLen);
            std::copy(begin(hostName), end(hostName), begin(newCtrlIdStr));
            newCtrlIdStr[hostName.length()] = '\0';
        }

        /* replace part of string and mark byte after the last as \0 */
        auto restStrIter = std::copy_n(requestData->data,
            requestData->bytes, begin(newCtrlIdStr) + requestData->offset);
        /* if the last written byte is not 64th - add '\0' */
        if (requestData->offset + requestData->bytes <= dcmi::maxCtrlIdStrLen)
        {
            *restStrIter = '\0';
        }

        /* if input data contains '\0' whole string is sent - update hostname */
        auto it = std::find(requestData->data,
            requestData->data + requestData->bytes, '\0');
        if (it != requestData->data + requestData->bytes)
        {
            sdbusplus::bus::bus bus{ ipmid_get_sd_bus_connection() };
            ipmi::setDbusProperty(bus, dcmi::networkServiceName,
                dcmi::networkConfigObj, dcmi::networkConfigIntf,
                dcmi::hostNameProp, std::string(newCtrlIdStr.data()));
        }
    }
    catch (InternalFailure& e)
    {
        *data_len = 0;
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    responseData->groupID = dcmi::groupExtId;
    responseData->offset = requestData->offset + requestData->bytes;
    *data_len = sizeof(*responseData);
    return IPMI_CC_OK;
}

//List of the capabilities under each parameter
dcmi::DCMICaps dcmiCaps =
{
//Supported DCMI Capabilities
    {
        dcmi::DCMICapParameters::SUPPORTED_DCMI_CAPS,
        {
            3, {{"PowerManagement", 2, 0, 1},
                {"OOBSecondaryLan", 3, 2, 1},
                {"SerialTMODE", 3, 1, 1},
                {"InBandSystemInterfaceChannel", 3, 0, 1}
            }
        }
    },
//Mandatory Platform Attributes
    {
        dcmi::DCMICapParameters::MANDATORY_PLAT_ATTRIBUTES,
        {
            5, {{"SELAutoRollOver", 1, 15, 1},
                {"FlushEntireSELUponRollOver", 1, 14, 1},
                {"RecordLevelSELFlushUponRollOver", 1, 13, 1},
                {"NumberOfSELEntries", 1, 0, 12},
                {"TempMonitoringSamplingFreq", 5, 0, 8}
            }
        }
    },
//Optional Platform Attributes
    {
        dcmi::DCMICapParameters::OPTIONAL_PLAT_ATTRIBUTES,
        {
            2, {{"PowerMgmtDeviceSlaveAddress", 1, 1, 7},
                {"BMCChannelNumber", 2, 4, 4},
                {"DeviceRivision", 2, 0, 4}
            }
        }
    },
//Manageability Access Attributes
    {
        dcmi::DCMICapParameters::MANAGEABILITY_ACCESS_ATTRIBUTES,
        {
            3, {{"MandatoryPrimaryLanOOBSupport", 1, 0, 8},
                {"OptionalSecondaryLanOOBSupport", 2, 0, 8},
                {"OptionalSerialOOBMTMODECapability", 3, 0, 8}
            }
        }
    }
};

ipmi_ret_t getDCMICapabilities(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                               ipmi_request_t request, ipmi_response_t response,
                               ipmi_data_len_t data_len, ipmi_context_t context)
{

    std::ifstream dcmiCapFile(DCMI_CAP_JSON_FILE);
    if (!dcmiCapFile.is_open())
    {
        log<level::ERR>("DCMI Capabilities file not found");
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    auto data = nlohmann::json::parse(dcmiCapFile, nullptr, false);
    if (data.is_discarded())
    {
        log<level::ERR>("DCMI Capabilities JSON parser failure");
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    auto requestData = reinterpret_cast<const dcmi::GetDCMICapRequest*>
                       (request);

    //get list of capabilities in a parameter
    auto caps =
        dcmiCaps.find(static_cast<dcmi::DCMICapParameters>(requestData->param));
    if (caps == dcmiCaps.end())
    {
        log<level::ERR>("Invalid input parameter");
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    if (requestData->groupID != dcmi::groupExtId)
    {
        *data_len = 0;
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    auto responseData = reinterpret_cast<dcmi::GetDCMICapResponse*>
                        (response);

    //For each capabilities in a parameter fill the data from
    //the json file based on the capability name.
    for (auto cap : caps->second.capList)
    {
        //If the data is beyond first byte boundary, insert in a
        //16bit pattern for example number of SEL entries are represented
        //in 12bits.
        if ((cap.length + cap.position) > 8)
        {
            //Read the value corresponding to capability name and assign to
            //16bit bitset.
            std::bitset<16> val(data.value(cap.name.c_str(), 0));
            val <<= cap.position;
            reinterpret_cast<uint16_t*>(responseData->data)[
                (cap.bytePosition - 1) / sizeof(uint16_t)] |= val.to_ulong();
        }
        else
        {
            responseData->data[cap.bytePosition - 1] |=
                data.value(cap.name.c_str(), 0) << cap.position;
        }
    }

    responseData->groupID = dcmi::groupExtId;
    responseData->major = DCMI_SPEC_MAJOR_VERSION;
    responseData->minor = DCMI_SPEC_MINOR_VERSION;
    responseData->paramRevision = DCMI_PARAMETER_REVISION;
    *data_len = sizeof(*responseData) + caps->second.size;

    return IPMI_CC_OK;
}

namespace dcmi
{
namespace temp_readings
{

Json parseConfig()
{
    std::ifstream jsonFile(configFile);
    if (!jsonFile.is_open())
    {
        log<level::ERR>("Temperature readings JSON file not found");
        elog<InternalFailure>();
    }

    auto data = Json::parse(jsonFile, nullptr, false);
    if (data.is_discarded())
    {
        log<level::ERR>("Temperature readings JSON parser failure");
        elog<InternalFailure>();
    }

    return data;
}

Temperature readTemp(const std::string& dbusService,
                     const std::string& dbusPath)
{
    // Read the temperature value from d-bus object. Need some conversion.
    // As per the interface xyz.openbmc_project.Sensor.Value, the temperature
    // is an int64_t and in degrees C. It needs to be scaled by using the
    // formula Value * 10^Scale. The ipmi spec has the temperature as a uint8_t,
    // with a separate single bit for the sign.

    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
    auto result = ipmi::getAllDbusProperties(bus, dbusService, dbusPath,
                                        "xyz.openbmc_project.Sensor.Value");
    auto temperature = result.at("Value").get<int64_t>();
    uint64_t absTemp = std::abs(temperature);

    auto factor = result.at("Scale").get<int64_t>();
    uint64_t scale = std::pow(10, factor); // pow() returns float/double
    unsigned long long tempDegrees = 0;
    // Overflow safe multiplication when the scale is > 0
    if (scale && __builtin_umulll_overflow(
                     absTemp, scale, &tempDegrees))
    {
        log<level::ERR>("Multiplication overflow detected",
                        entry("TEMP_VALUE=%llu", absTemp),
                        entry("SCALE_FACTOR=%llu", scale));
        elog<InternalFailure>();
    }
    else
    {
        // The (uint64_t)scale value is 0, effectively this is division
        tempDegrees = absTemp * std::pow(10, factor);
    }
    // Max absolute temp as per ipmi spec is 128.
    if (tempDegrees > maxTemp)
    {
        tempDegrees = maxTemp;
    }

    return std::make_tuple(static_cast<uint8_t>(tempDegrees),
                           (temperature < 0));
}

std::tuple<Response, NumInstances> read(const std::string& type,
                                        uint8_t instance)
{
    Response response{};
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};

    if (!instance)
    {
        log<level::ERR>("Expected non-zero instance");
        elog<InternalFailure>();
    }

    auto data = parseConfig();
    static const std::vector<Json> empty{};
    std::vector<Json> readings = data.value(type, empty);
    size_t numInstances = readings.size();
    for (const auto& j : readings)
    {
        uint8_t instanceNum = j.value("instance", 0);
        // Not the instance we're interested in
        if (instanceNum != instance)
        {
            continue;
        }

        std::string path = j.value("dbus", "");
        std::string service;
        try
        {
            service =
                ipmi::getService(bus,
                                 "xyz.openbmc_project.Sensor.Value",
                                 path);
        }
        catch (std::exception& e)
        {
            log<level::DEBUG>(e.what());
            return std::make_tuple(response, numInstances);
        }

        response.instance = instance;
        uint8_t temp{};
        bool sign{};
        std::tie(temp, sign) = readTemp(service, path);
        response.temperature = temp;
        response.sign = sign;

        // Found the instance we're interested in
        break;
    }

    if (numInstances > maxInstances)
    {
        numInstances = maxInstances;
    }
    return std::make_tuple(response, numInstances);
}

std::tuple<ResponseList, NumInstances> readAll(const std::string& type,
                                               uint8_t instanceStart)
{
    ResponseList response{};
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};

    size_t numInstances = 0;
    auto data = parseConfig();
    static const std::vector<Json> empty{};
    std::vector<Json> readings = data.value(type, empty);
    numInstances = readings.size();
    for (const auto& j : readings)
    {
        try
        {
            // Max of 8 response data sets
            if (response.size() == maxDataSets)
            {
                break;
            }

            uint8_t instanceNum = j.value("instance", 0);
            // Not in the instance range we're interested in
            if (instanceNum < instanceStart)
            {
                continue;
            }

            std::string path = j.value("dbus", "");
            auto service =
                ipmi::getService(bus,
                                 "xyz.openbmc_project.Sensor.Value",
                                 path);

            Response r{};
            r.instance = instanceNum;
            uint8_t temp{};
            bool sign{};
            std::tie(temp, sign) = readTemp(service, path);
            r.temperature = temp;
            r.sign = sign;
            response.push_back(r);
        }
        catch (std::exception& e)
        {
            log<level::DEBUG>(e.what());
            continue;
        }
    }

    if (numInstances > maxInstances)
    {
        numInstances = maxInstances;
    }
    return std::make_tuple(response, numInstances);
}

} // namsespace temp_readings
} // namsepace dcmi

ipmi_ret_t getTempReadings(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                       ipmi_request_t request, ipmi_response_t response,
                       ipmi_data_len_t data_len, ipmi_context_t context)
{
    // Refer Table 6-14, DCMI Entity ID Extension, DCMI v1.5 spec
    static const std::map<uint8_t, std::string> entityIdToName
    {
        {0x40, "inlet"},
        {0x37, "inlet"},
        {0x41, "cpu"},
        {0x03, "cpu"},
        {0x42, "baseboard"},
        {0x07, "baseboard"}
    };

    auto requestData =
        reinterpret_cast<const dcmi::GetTempReadingsRequest*>(request);
    auto responseData =
        reinterpret_cast<dcmi::GetTempReadingsResponseHdr*>(response);

    if (*data_len != sizeof(dcmi::GetTempReadingsRequest))
    {
        log<level::ERR>("Malformed request data",
                        entry("DATA_SIZE=%d", *data_len));
        return IPMI_CC_REQ_DATA_LEN_INVALID;
    }
    *data_len = 0;

    auto it = entityIdToName.find(requestData->entityId);
    if (it == entityIdToName.end())
    {
        log<level::ERR>("Unknown Entity ID",
                        entry("ENTITY_ID=%d", requestData->entityId));
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    if (requestData->groupID != dcmi::groupExtId)
    {
        log<level::ERR>("Invalid Group ID",
                        entry("GROUP_ID=%d", requestData->groupID));
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    if (requestData->sensorType != dcmi::temperatureSensorType)
    {
        log<level::ERR>("Invalid sensor type",
                        entry("SENSOR_TYPE=%d", requestData->sensorType));
        return IPMI_CC_INVALID_FIELD_REQUEST;
    }

    dcmi::temp_readings::ResponseList temps{};
    try
    {
        if (!requestData->entityInstance)
        {
            // Read all instances
            std::tie(temps, responseData->numInstances) =
                dcmi::temp_readings::readAll(it->second,
                                             requestData->instanceStart);
        }
        else
        {
            // Read one instance
            temps.resize(1);
            std::tie(temps[0], responseData->numInstances) =
                dcmi::temp_readings::read(it->second,
                                          requestData->entityInstance);
        }
        responseData->numDataSets = temps.size();
    }
    catch (InternalFailure& e)
    {
        return IPMI_CC_UNSPECIFIED_ERROR;
    }

    responseData->groupID = dcmi::groupExtId;
    size_t payloadSize =
        temps.size() * sizeof(dcmi::temp_readings::Response);
    if (!temps.empty())
    {
        memcpy(responseData + 1, // copy payload right after the response header
               temps.data(),
               payloadSize);
    }
    *data_len = sizeof(dcmi::GetTempReadingsResponseHdr) + payloadSize;

    return IPMI_CC_OK;
}

void register_netfn_dcmi_functions()
{
    // <Get Power Limit>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
            NETFUN_GRPEXT, dcmi::Commands::GET_POWER_LIMIT);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::GET_POWER_LIMIT,
                           NULL, getPowerLimit, PRIVILEGE_USER);

    // <Set Power Limit>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
            NETFUN_GRPEXT, dcmi::Commands::SET_POWER_LIMIT);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::SET_POWER_LIMIT,
                           NULL, setPowerLimit, PRIVILEGE_OPERATOR);

    // <Activate/Deactivate Power Limit>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
            NETFUN_GRPEXT, dcmi::Commands::APPLY_POWER_LIMIT);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::APPLY_POWER_LIMIT,
                           NULL, applyPowerLimit, PRIVILEGE_OPERATOR);

    // <Get Asset Tag>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
            NETFUN_GRPEXT, dcmi::Commands::GET_ASSET_TAG);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::GET_ASSET_TAG,
                           NULL, getAssetTag, PRIVILEGE_USER);

    // <Set Asset Tag>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
            NETFUN_GRPEXT, dcmi::Commands::SET_ASSET_TAG);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::SET_ASSET_TAG,
                           NULL, setAssetTag, PRIVILEGE_OPERATOR);

    // <Get Management Controller Identifier String>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
        NETFUN_GRPEXT, dcmi::Commands::GET_MGMNT_CTRL_ID_STR);

    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::GET_MGMNT_CTRL_ID_STR,
        NULL, getMgmntCtrlIdStr, PRIVILEGE_USER);

    // <Set Management Controller Identifier String>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",
        NETFUN_GRPEXT, dcmi::Commands::SET_MGMNT_CTRL_ID_STR);
    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::SET_MGMNT_CTRL_ID_STR,
        NULL, setMgmntCtrlIdStr, PRIVILEGE_ADMIN);

    // <Get DCMI capabilities>
    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::GET_CAPABILITIES,
        NULL, getDCMICapabilities, PRIVILEGE_USER);

    // <Get Temperature Readings>
    ipmi_register_callback(NETFUN_GRPEXT, dcmi::Commands::GET_TEMP_READINGS,
                           NULL, getTempReadings, PRIVILEGE_USER);

    return;
}
// 956379