#include "dcmihandler.hpp"
#include "host-ipmid/ipmid-api.h"
#include <phosphor-logging/elog-errors.hpp>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "utils.hpp"
#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));


ipmi_ret_t ipmi_dcmi_get_power_limit(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)
{
    ipmi_ret_t rc = IPMI_DCMI_CC_NO_ACTIVE_POWER_LIMIT;

    // dcmi-v1-5-rev-spec.pdf 6.6.2.   
    // This is good enough for OpenBMC support for OpenPOWER based systems
    // TODO research if more is needed
    uint8_t data_response[] = { 0xDC, 0x00, 0x00, 0x01, 0x00, 0x00, 
                                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
                                0x00, 0x01};



    printf("IPMI DCMI_GET_POWER_LEVEL\n");

    memcpy(response, data_response, sizeof(data_response));
    *data_len = sizeof(data_response);

    return rc;
}

namespace dcmi
{

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>();
}

} // namespace dcmi

void register_netfn_dcmi_functions()
{
    // <Get Power Limit>
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",NETFUN_GRPEXT, IPMI_CMD_DCMI_GET_POWER);
    ipmi_register_callback(NETFUN_GRPEXT, IPMI_CMD_DCMI_GET_POWER, NULL, ipmi_dcmi_get_power_limit,
                           PRIVILEGE_USER);
    return;
}
// 956379