
#include "platform.hpp"

#include "utils.hpp"

namespace pldm
{
namespace responder
{
namespace platform
{

using InternalFailure =
    sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;

void Handler::generateStateEffecterRepo(const Json& json, Repo& repo)
{
    static const std::vector<Json> emptyList{};
    static const Json empty{};
    auto entries = json.value("entries", emptyList);
    for (const auto& e : entries)
    {
        size_t pdrSize = 0;
        auto effecters = e.value("effecters", emptyList);
        static const Json empty{};
        for (const auto& effecter : effecters)
        {
            auto set = effecter.value("set", empty);
            auto statesSize = set.value("size", 0);
            if (!statesSize)
            {
                std::cerr << "Malformed PDR JSON return "
                             "pdrEntry;- no state set "
                             "info, TYPE="
                          << PLDM_STATE_EFFECTER_PDR << "\n";
                throw InternalFailure();
            }
            pdrSize += sizeof(state_effecter_possible_states) -
                       sizeof(bitfield8_t) + (sizeof(bitfield8_t) * statesSize);
        }
        pdrSize += sizeof(pldm_state_effecter_pdr) - sizeof(uint8_t);

        std::vector<uint8_t> entry{};
        entry.resize(pdrSize);

        pldm_state_effecter_pdr* pdr =
            reinterpret_cast<pldm_state_effecter_pdr*>(entry.data());
        pdr->hdr.record_handle = 0;
        pdr->hdr.version = 1;
        pdr->hdr.type = PLDM_STATE_EFFECTER_PDR;
        pdr->hdr.record_change_num = 0;
        pdr->hdr.length = pdrSize - sizeof(pldm_pdr_hdr);

        pdr->terminus_handle = 0;
        pdr->effecter_id = this->getNextEffecterId();
        pdr->entity_type = e.value("type", 0);
        pdr->entity_instance = e.value("instance", 0);
        pdr->container_id = e.value("container", 0);
        pdr->effecter_semantic_id = 0;
        pdr->effecter_init = PLDM_NO_INIT;
        pdr->has_description_pdr = false;
        pdr->composite_effecter_count = effecters.size();

        EffecterObjs paths{};
        uint8_t* start =
            entry.data() + sizeof(pldm_state_effecter_pdr) - sizeof(uint8_t);
        for (const auto& effecter : effecters)
        {
            auto set = effecter.value("set", empty);
            state_effecter_possible_states* possibleStates =
                reinterpret_cast<state_effecter_possible_states*>(start);
            possibleStates->state_set_id = set.value("id", 0);
            possibleStates->possible_states_size = set.value("size", 0);

            start += sizeof(possibleStates->state_set_id) +
                     sizeof(possibleStates->possible_states_size);
            static const std::vector<uint8_t> emptyStates{};
            auto states = set.value("states", emptyStates);
            for (const auto& state : states)
            {
                auto index = state / 8;
                auto bit = state - (index * 8);
                bitfield8_t* bf = reinterpret_cast<bitfield8_t*>(start + index);
                bf->byte |= 1 << bit;
            }
            start += possibleStates->possible_states_size;

            auto dbus = effecter.value("dbus", empty);
            paths.emplace_back(std::move(dbus));
        }
        addEffecterObjs(pdr->effecter_id, std::move(paths));
        PdrEntry pdrEntry{};
        pdrEntry.data = entry.data();
        pdrEntry.size = pdrSize;
        repo.addRecord(pdrEntry);
    }
}

void Handler::generate(const std::string& dir, Repo& repo)
{
    // A map of PDR type to a lambda that handles creation of that PDR type.
    // The lambda essentially would parse the platform specific PDR JSONs to
    // generate the PDR structures. This function iterates through the map to
    // invoke all lambdas, so that all PDR types can be created.
    const std::map<Type, std::function<void(const Json& json, Repo& repo)>>
        generators = {
            {PLDM_STATE_EFFECTER_PDR, [this](const auto& json, Repo& repo) {
                 generateStateEffecterRepo(json, repo);
             }}};

    Type pdrType{};
    for (const auto& dirEntry : fs::directory_iterator(dir))
    {
        try
        {
            auto json = readJson(dirEntry.path().string());
            if (!json.empty())
            {
                pdrType = json.value("pdrType", 0);
                generators.at(pdrType)(json, repo);
            }
        }
        catch (const InternalFailure& e)
        {
            std::cerr << "PDR config directory does not exist or empty, TYPE= "
                      << pdrType << "PATH= " << dirEntry
                      << " ERROR=" << e.what() << "\n";
        }
        catch (const Json::exception& e)
        {
            std::cerr << "Failed parsing PDR JSON file, TYPE= " << pdrType
                      << " ERROR=" << e.what() << "\n";
            pldm::utils::reportError(
                "xyz.openbmc_project.bmc.pldm.InternalFailure");
        }
        catch (const std::exception& e)
        {
            std::cerr << "Failed parsing PDR JSON file, TYPE= " << pdrType
                      << " ERROR=" << e.what() << "\n";
            pldm::utils::reportError(
                "xyz.openbmc_project.bmc.pldm.InternalFailure");
        }
    }
}

Response Handler::getPDR(const pldm_msg* request, size_t payloadLength)
{
    Response response(sizeof(pldm_msg_hdr) + PLDM_GET_PDR_MIN_RESP_BYTES, 0);
    auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

    if (payloadLength != PLDM_GET_PDR_REQ_BYTES)
    {
        return CmdHandler::ccOnlyResponse(request, PLDM_ERROR_INVALID_LENGTH);
    }

    uint32_t recordHandle{};
    uint32_t dataTransferHandle{};
    uint8_t transferOpFlag{};
    uint16_t reqSizeBytes{};
    uint16_t recordChangeNum{};

    auto rc = decode_get_pdr_req(request, payloadLength, &recordHandle,
                                 &dataTransferHandle, &transferOpFlag,
                                 &reqSizeBytes, &recordChangeNum);
    if (rc != PLDM_SUCCESS)
    {
        return CmdHandler::ccOnlyResponse(request, rc);
    }

    uint16_t respSizeBytes{};
    uint8_t* recordData = nullptr;
    try
    {
        pdr_utils::PdrEntry e;
        auto record = pdr::getRecordByHandle(pdrRepo, recordHandle, e);
        if (record == NULL)
        {
            return CmdHandler::ccOnlyResponse(
                request, PLDM_PLATFORM_INVALID_RECORD_HANDLE);
        }

        if (reqSizeBytes)
        {
            respSizeBytes = e.size;
            if (respSizeBytes > reqSizeBytes)
            {
                respSizeBytes = reqSizeBytes;
            }
            recordData = e.data;
        }
        response.resize(sizeof(pldm_msg_hdr) + PLDM_GET_PDR_MIN_RESP_BYTES +
                            respSizeBytes,
                        0);
        responsePtr = reinterpret_cast<pldm_msg*>(response.data());
        rc = encode_get_pdr_resp(request->hdr.instance_id, PLDM_SUCCESS,
                                 e.handle.nextRecordHandle, 0, PLDM_START,
                                 respSizeBytes, recordData, 0, responsePtr);
        if (rc != PLDM_SUCCESS)
        {
            return ccOnlyResponse(request, rc);
        }
    }
    catch (const std::exception& e)
    {
        std::cerr << "Error accessing PDR, HANDLE=" << recordHandle
                  << " ERROR=" << e.what() << "\n";
        return CmdHandler::ccOnlyResponse(request, PLDM_ERROR);
    }
    return response;
}

Response Handler::setStateEffecterStates(const pldm_msg* request,
                                         size_t payloadLength)
{
    Response response(
        sizeof(pldm_msg_hdr) + PLDM_SET_STATE_EFFECTER_STATES_RESP_BYTES, 0);
    auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());
    uint16_t effecterId;
    uint8_t compEffecterCnt;
    constexpr auto maxCompositeEffecterCnt = 8;
    std::vector<set_effecter_state_field> stateField(maxCompositeEffecterCnt,
                                                     {0, 0});

    if ((payloadLength > PLDM_SET_STATE_EFFECTER_STATES_REQ_BYTES) ||
        (payloadLength < sizeof(effecterId) + sizeof(compEffecterCnt) +
                             sizeof(set_effecter_state_field)))
    {
        return CmdHandler::ccOnlyResponse(request, PLDM_ERROR_INVALID_LENGTH);
    }

    int rc = decode_set_state_effecter_states_req(request, payloadLength,
                                                  &effecterId, &compEffecterCnt,
                                                  stateField.data());

    if (rc != PLDM_SUCCESS)
    {
        return CmdHandler::ccOnlyResponse(request, rc);
    }

    stateField.resize(compEffecterCnt);
    const pldm::utils::DBusHandler dBusIntf;
    rc = setStateEffecterStatesHandler<pldm::utils::DBusHandler>(
        dBusIntf, effecterId, stateField);
    if (rc != PLDM_SUCCESS)
    {
        return CmdHandler::ccOnlyResponse(request, rc);
    }

    rc = encode_set_state_effecter_states_resp(request->hdr.instance_id, rc,
                                               responsePtr);
    if (rc != PLDM_SUCCESS)
    {
        return ccOnlyResponse(request, rc);
    }

    return response;
}

} // namespace platform
} // namespace responder
} // namespace pldm