#include "common/flight_recorder.hpp"
#include "common/instance_id.hpp"
#include "common/transport.hpp"
#include "common/utils.hpp"
#include "dbus_impl_requester.hpp"
#include "fw-update/manager.hpp"
#include "invoker.hpp"
#include "platform-mc/manager.hpp"
#include "requester/handler.hpp"
#include "requester/mctp_endpoint_discovery.hpp"
#include "requester/request.hpp"

#include <err.h>
#include <getopt.h>
#include <libpldm/base.h>
#include <libpldm/bios.h>
#include <libpldm/pdr.h>
#include <libpldm/platform.h>
#include <libpldm/transport.h>
#include <poll.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

#include <phosphor-logging/lg2.hpp>
#include <sdeventplus/event.hpp>
#include <sdeventplus/source/io.hpp>
#include <sdeventplus/source/signal.hpp>
#include <stdplus/signal.hpp>

#include <cstdio>
#include <cstring>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <memory>
#include <ranges>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>

PHOSPHOR_LOG2_USING;

#ifdef LIBPLDMRESPONDER
#include "dbus_impl_pdr.hpp"
#include "host-bmc/dbus_to_event_handler.hpp"
#include "host-bmc/dbus_to_host_effecters.hpp"
#include "host-bmc/host_condition.hpp"
#include "host-bmc/host_pdr_handler.hpp"
#include "libpldmresponder/base.hpp"
#include "libpldmresponder/bios.hpp"
#include "libpldmresponder/fru.hpp"
#include "libpldmresponder/oem_handler.hpp"
#include "libpldmresponder/platform.hpp"
#include "libpldmresponder/platform_config.hpp"
#include "xyz/openbmc_project/PLDM/Event/server.hpp"
#endif

#ifdef OEM_IBM
#include "oem_ibm.hpp"
#endif

constexpr uint8_t MCTP_MSG_TYPE_PLDM = 1;

using namespace pldm;
using namespace sdeventplus;
using namespace sdeventplus::source;
using namespace pldm::responder;
using namespace pldm::utils;
using sdeventplus::source::Signal;
using namespace pldm::flightrecorder;

void interruptFlightRecorderCallBack(Signal& /*signal*/,
                                     const struct signalfd_siginfo*)
{
    error("Received SIGUR1(10) Signal interrupt");
    // obtain the flight recorder instance and dump the recorder
    FlightRecorder::GetInstance().playRecorder();
}

void requestPLDMServiceName()
{
    auto& bus = pldm::utils::DBusHandler::getBus();
    bus.request_name("xyz.openbmc_project.PLDM");
}

static std::optional<Response>
    processRxMsg(const std::vector<uint8_t>& requestMsg, Invoker& invoker,
                 requester::Handler<requester::Request>& handler,
                 fw_update::Manager* fwManager, pldm_tid_t tid)
{
    uint8_t eid = tid;

    pldm_header_info hdrFields{};
    auto hdr = reinterpret_cast<const pldm_msg_hdr*>(requestMsg.data());
    if (PLDM_SUCCESS != unpack_pldm_header(hdr, &hdrFields))
    {
        error("Empty PLDM request header");
        return std::nullopt;
    }

    if (PLDM_RESPONSE != hdrFields.msg_type)
    {
        Response response;
        auto request = reinterpret_cast<const pldm_msg*>(hdr);
        size_t requestLen = requestMsg.size() - sizeof(struct pldm_msg_hdr);
        try
        {
            if (hdrFields.pldm_type != PLDM_FWUP)
            {
                response = invoker.handle(tid, hdrFields.pldm_type,
                                          hdrFields.command, request,
                                          requestLen);
            }
            else
            {
                response = fwManager->handleRequest(eid, hdrFields.command,
                                                    request, requestLen);
            }
        }
        catch (const std::out_of_range& e)
        {
            uint8_t completion_code = PLDM_ERROR_UNSUPPORTED_PLDM_CMD;
            response.resize(sizeof(pldm_msg_hdr));
            auto responseHdr = reinterpret_cast<pldm_msg_hdr*>(response.data());
            pldm_header_info header{};
            header.msg_type = PLDM_RESPONSE;
            header.instance = hdrFields.instance;
            header.pldm_type = hdrFields.pldm_type;
            header.command = hdrFields.command;
            if (PLDM_SUCCESS != pack_pldm_header(&header, responseHdr))
            {
                error(
                    "Failed to add response header for processing Rx, error - {ERROR}",
                    "ERROR", e);
                return std::nullopt;
            }
            response.insert(response.end(), completion_code);
        }
        return response;
    }
    else if (PLDM_RESPONSE == hdrFields.msg_type)
    {
        auto response = reinterpret_cast<const pldm_msg*>(hdr);
        size_t responseLen = requestMsg.size() - sizeof(struct pldm_msg_hdr);
        handler.handleResponse(eid, hdrFields.instance, hdrFields.pldm_type,
                               hdrFields.command, response, responseLen);
    }
    return std::nullopt;
}

void optionUsage(void)
{
    info("Usage: pldmd [options]");
    info("Options:");
    info(" [--verbose] - would enable verbosity");
}

int main(int argc, char** argv)
{
    bool verbose = false;
    static struct option long_options[] = {{"verbose", no_argument, 0, 'v'},
                                           {0, 0, 0, 0}};

    auto argflag = getopt_long(argc, argv, "v", long_options, nullptr);
    switch (argflag)
    {
        case 'v':
            verbose = true;
            break;
        case -1:
            break;
        default:
            optionUsage();
            exit(EXIT_FAILURE);
    }
    // Setup PLDM requester transport
    auto hostEID = pldm::utils::readHostEID();
    /* To maintain current behaviour until we have the infrastructure to find
     * and use the correct TIDs */
    pldm_tid_t TID = hostEID;
    PldmTransport pldmTransport{};
    auto event = Event::get_default();
    auto& bus = pldm::utils::DBusHandler::getBus();
    sdbusplus::server::manager_t objManager(bus,
                                            "/xyz/openbmc_project/software");

    InstanceIdDb instanceIdDb;
    dbus_api::Requester dbusImplReq(bus, "/xyz/openbmc_project/pldm",
                                    instanceIdDb);
    sdbusplus::server::manager_t inventoryManager(
        bus, "/xyz/openbmc_project/inventory");

    Invoker invoker{};
    requester::Handler<requester::Request> reqHandler(&pldmTransport, event,
                                                      instanceIdDb, verbose);

#ifdef LIBPLDMRESPONDER
    using namespace pldm::state_sensor;
    dbus_api::Host dbusImplHost(bus, "/xyz/openbmc_project/pldm");
    std::unique_ptr<pldm_pdr, decltype(&pldm_pdr_destroy)> pdrRepo(
        pldm_pdr_init(), pldm_pdr_destroy);
    if (!pdrRepo)
    {
        throw std::runtime_error("Failed to instantiate PDR repository");
    }
    std::unique_ptr<pldm_entity_association_tree,
                    decltype(&pldm_entity_association_tree_destroy)>
        entityTree(pldm_entity_association_tree_init(),
                   pldm_entity_association_tree_destroy);
    if (!entityTree)
    {
        throw std::runtime_error(
            "Failed to instantiate general PDR entity association tree");
    }
    std::unique_ptr<pldm_entity_association_tree,
                    decltype(&pldm_entity_association_tree_destroy)>
        bmcEntityTree(pldm_entity_association_tree_init(),
                      pldm_entity_association_tree_destroy);
    if (!bmcEntityTree)
    {
        throw std::runtime_error(
            "Failed to instantiate BMC PDR entity association tree");
    }
    std::shared_ptr<HostPDRHandler> hostPDRHandler;
    std::unique_ptr<pldm::host_effecters::HostEffecterParser>
        hostEffecterParser;
    std::unique_ptr<DbusToPLDMEvent> dbusToPLDMEventHandler;
    DBusHandler dbusHandler;
    std::unique_ptr<platform_config::Handler> platformConfigHandler{};
    platformConfigHandler = std::make_unique<platform_config::Handler>();

    if (hostEID)
    {
        hostPDRHandler = std::make_shared<HostPDRHandler>(
            pldmTransport.getEventSource(), hostEID, event, pdrRepo.get(),
            EVENTS_JSONS_DIR, entityTree.get(), bmcEntityTree.get(),
            instanceIdDb, &reqHandler);

        // HostFirmware interface needs access to hostPDR to know if host
        // is running
        dbusImplHost.setHostPdrObj(hostPDRHandler);

        hostEffecterParser =
            std::make_unique<pldm::host_effecters::HostEffecterParser>(
                &instanceIdDb, pldmTransport.getEventSource(), pdrRepo.get(),
                &dbusHandler, HOST_JSONS_DIR, &reqHandler);
        dbusToPLDMEventHandler = std::make_unique<DbusToPLDMEvent>(
            pldmTransport.getEventSource(), hostEID, instanceIdDb, &reqHandler);
    }

    auto fruHandler = std::make_unique<fru::Handler>(
        FRU_JSONS_DIR, FRU_MASTER_JSON, pdrRepo.get(), entityTree.get(),
        bmcEntityTree.get());

    // FRU table is built lazily when a FRU command or Get PDR command is
    // handled. To enable building FRU table, the FRU handler is passed to the
    // Platform handler.
    auto platformHandler = std::make_unique<platform::Handler>(
        &dbusHandler, hostEID, &instanceIdDb, PDR_JSONS_DIR, pdrRepo.get(),
        hostPDRHandler.get(), dbusToPLDMEventHandler.get(), fruHandler.get(),
        platformConfigHandler.get(), &reqHandler, event, true);

    auto biosHandler = std::make_unique<bios::Handler>(
        pldmTransport.getEventSource(), hostEID, &instanceIdDb, &reqHandler,
        platformConfigHandler.get(), requestPLDMServiceName);

    auto baseHandler = std::make_unique<base::Handler>(event);

#ifdef OEM_IBM
    pldm::oem_ibm::OemIBM oemIBM(&dbusHandler, pldmTransport.getEventSource(),
                                 hostEID, pdrRepo.get(), instanceIdDb, event,
                                 invoker, hostPDRHandler.get(),
                                 platformHandler.get(), fruHandler.get(),
                                 baseHandler.get(), &reqHandler);
#endif

    invoker.registerHandler(PLDM_BIOS, std::move(biosHandler));
    invoker.registerHandler(PLDM_PLATFORM, std::move(platformHandler));
    invoker.registerHandler(PLDM_FRU, std::move(fruHandler));
    invoker.registerHandler(PLDM_BASE, std::move(baseHandler));

    dbus_api::Pdr dbusImplPdr(bus, "/xyz/openbmc_project/pldm", pdrRepo.get());
    sdbusplus::xyz::openbmc_project::PLDM::server::Event dbusImplEvent(
        bus, "/xyz/openbmc_project/pldm");

#endif

    std::unique_ptr<fw_update::Manager> fwManager =
        std::make_unique<fw_update::Manager>(event, reqHandler, instanceIdDb);
    std::unique_ptr<platform_mc::Manager> platformManager =
        std::make_unique<platform_mc::Manager>(event, reqHandler, instanceIdDb);
    std::unique_ptr<MctpDiscovery> mctpDiscoveryHandler =
        std::make_unique<MctpDiscovery>(
            bus, std::initializer_list<MctpDiscoveryHandlerIntf*>{
                     fwManager.get(), platformManager.get()});
    auto callback = [verbose, &invoker, &reqHandler, &fwManager, &pldmTransport,
                     TID](IO& io, int fd, uint32_t revents) mutable {
        if (!(revents & EPOLLIN))
        {
            return;
        }
        if (fd < 0)
        {
            return;
        }

        int returnCode = 0;
        void* requestMsg;
        size_t recvDataLength;
        returnCode = pldmTransport.recvMsg(TID, requestMsg, recvDataLength);

        if (returnCode == PLDM_REQUESTER_SUCCESS)
        {
            std::vector<uint8_t> requestMsgVec(
                static_cast<uint8_t*>(requestMsg),
                static_cast<uint8_t*>(requestMsg) + recvDataLength);
            FlightRecorder::GetInstance().saveRecord(requestMsgVec, false);
            if (verbose)
            {
                printBuffer(Rx, requestMsgVec);
            }
            // process message and send response
            auto response = processRxMsg(requestMsgVec, invoker, reqHandler,
                                         fwManager.get(), TID);
            if (response.has_value())
            {
                FlightRecorder::GetInstance().saveRecord(*response, true);
                if (verbose)
                {
                    printBuffer(Tx, *response);
                }

                returnCode = pldmTransport.sendMsg(TID, (*response).data(),
                                                   (*response).size());
                if (returnCode != PLDM_REQUESTER_SUCCESS)
                {
                    warning(
                        "Failed to send pldmTransport message for TID '{TID}', response code '{RETURN_CODE}'",
                        "TID", TID, "RETURN_CODE", returnCode);
                }
            }
        }
        // TODO check that we get here if mctp-demux dies?
        else if (returnCode == PLDM_REQUESTER_RECV_FAIL)
        {
            // MCTP daemon has closed the socket this daemon is connected to.
            // This may or may not be an error scenario, in either case the
            // recovery mechanism for this daemon is to restart, and hence exit
            // the event loop, that will cause this daemon to exit with a
            // failure code.
            error(
                "MCTP daemon closed the socket, IO exiting with response code '{RC}'",
                "RC", returnCode);
            io.get_event().exit(0);
        }
        else
        {
            warning(
                "Failed to receive PLDM request for pldmTransport, response code '{RETURN_CODE}'",
                "RETURN_CODE", returnCode);
        }
        /* Free requestMsg after using */
        free(requestMsg);
    };

    bus.attach_event(event.get(), SD_EVENT_PRIORITY_NORMAL);
#ifndef SYSTEM_SPECIFIC_BIOS_JSON
    bus.request_name("xyz.openbmc_project.PLDM");
#endif
    IO io(event, pldmTransport.getEventSource(), EPOLLIN, std::move(callback));
#ifdef LIBPLDMRESPONDER
    if (hostPDRHandler)
    {
        hostPDRHandler->setHostFirmwareCondition();
    }
#endif
    stdplus::signal::block(SIGUSR1);
    sdeventplus::source::Signal sigUsr1(
        event, SIGUSR1, std::bind_front(&interruptFlightRecorderCallBack));
    int returnCode = event.loop();
    if (returnCode)
    {
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);
}