/*
// Copyright (c) 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 <systemd/sd-journal.h>

#include <boost/algorithm/string.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/container/flat_map.hpp>
#include <boost/container/flat_set.hpp>
#include <pulse_event_monitor.hpp>
#include <sdbusplus/asio/object_server.hpp>
#include <sel_logger.hpp>
#include <threshold_event_monitor.hpp>
#include <watchdog_event_monitor.hpp>
#ifdef SEL_LOGGER_MONITOR_THRESHOLD_ALARM_EVENTS
#include <threshold_alarm_event_monitor.hpp>
#endif

#include <filesystem>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <sstream>

#ifdef SEL_LOGGER_SEND_TO_LOGGING_SERVICE
#include <phosphor-logging/elog-errors.hpp>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <xyz/openbmc_project/Logging/SEL/error.hpp>

using namespace phosphor::logging;
using SELCreated =
    sdbusplus::xyz::openbmc_project::Logging::SEL::Error::Created;
#endif

struct DBusInternalError final : public sdbusplus::exception_t
{
    const char* name() const noexcept override
    {
        return "org.freedesktop.DBus.Error.Failed";
    }
    const char* description() const noexcept override
    {
        return "internal error";
    }
    const char* what() const noexcept override
    {
        return "org.freedesktop.DBus.Error.Failed: "
               "internal error";
    }

    int get_errno() const noexcept override
    {
        return EACCES;
    }
};

#ifndef SEL_LOGGER_SEND_TO_LOGGING_SERVICE
static bool getSELLogFiles(std::vector<std::filesystem::path>& selLogFiles)
{
    // Loop through the directory looking for ipmi_sel log files
    for (const std::filesystem::directory_entry& dirEnt :
         std::filesystem::directory_iterator(selLogDir))
    {
        std::string filename = dirEnt.path().filename();
        if (boost::starts_with(filename, selLogFilename))
        {
            // If we find an ipmi_sel log file, save the path
            selLogFiles.emplace_back(selLogDir / filename);
        }
    }
    // As the log files rotate, they are appended with a ".#" that is higher for
    // the older logs. Since we don't expect more than 10 log files, we
    // can just sort the list to get them in order from newest to oldest
    std::sort(selLogFiles.begin(), selLogFiles.end());

    return !selLogFiles.empty();
}

static unsigned int initializeRecordId(void)
{
    std::vector<std::filesystem::path> selLogFiles;
    if (!getSELLogFiles(selLogFiles))
    {
        return selInvalidRecID;
    }
    std::ifstream logStream(selLogFiles.front());
    if (!logStream.is_open())
    {
        return selInvalidRecID;
    }
    std::string line;
    std::string newestEntry;
    while (std::getline(logStream, line))
    {
        newestEntry = line;
    }

    std::vector<std::string> newestEntryFields;
    boost::split(newestEntryFields, newestEntry, boost::is_any_of(" ,"),
                 boost::token_compress_on);
    if (newestEntryFields.size() < 4)
    {
        return selInvalidRecID;
    }

    return std::stoul(newestEntryFields[1]);
}

#ifdef SEL_LOGGER_CLEARS_SEL
static unsigned int recordId = initializeRecordId();

void clearSelLogFiles()
{
    // Clear the SEL by deleting the log files
    std::vector<std::filesystem::path> selLogFiles;
    if (getSELLogFiles(selLogFiles))
    {
        for (const std::filesystem::path& file : selLogFiles)
        {
            std::error_code ec;
            std::filesystem::remove(file, ec);
        }
    }

    recordId = selInvalidRecID;

    // Reload rsyslog so it knows to start new log files
    boost::asio::io_service io;
    auto dbus = std::make_shared<sdbusplus::asio::connection>(io);
    sdbusplus::message::message rsyslogReload = dbus->new_method_call(
        "org.freedesktop.systemd1", "/org/freedesktop/systemd1",
        "org.freedesktop.systemd1.Manager", "ReloadUnit");
    rsyslogReload.append("rsyslog.service", "replace");
    try
    {
        sdbusplus::message::message reloadResponse = dbus->call(rsyslogReload);
    }
    catch (sdbusplus::exception_t& e)
    {
        std::cerr << e.what() << "\n";
    }
}
#endif

static unsigned int getNewRecordId(void)
{
#ifndef SEL_LOGGER_CLEARS_SEL
    static unsigned int recordId = initializeRecordId();

    // If the log has been cleared, also clear the current ID
    std::vector<std::filesystem::path> selLogFiles;
    if (!getSELLogFiles(selLogFiles))
    {
        recordId = selInvalidRecID;
    }
#endif

    if (++recordId >= selInvalidRecID)
    {
        recordId = 1;
    }
    return recordId;
}
#endif

static void toHexStr(const std::vector<uint8_t>& data, std::string& hexStr)
{
    std::stringstream stream;
    stream << std::hex << std::uppercase << std::setfill('0');
    for (int v : data)
    {
        stream << std::setw(2) << v;
    }
    hexStr = stream.str();
}

template <typename... T>
static uint16_t selAddSystemRecord([[maybe_unused]] const std::string& message,
                                   const std::string& path,
                                   const std::vector<uint8_t>& selData,
                                   const bool& assert, const uint16_t& genId,
                                   [[maybe_unused]] T&&... metadata)
{
    // Only 3 bytes of SEL event data are allowed in a system record
    if (selData.size() > selEvtDataMaxSize)
    {
        throw std::invalid_argument("Event data too large");
    }
    std::string selDataStr;
    toHexStr(selData, selDataStr);

#ifdef SEL_LOGGER_SEND_TO_LOGGING_SERVICE
    using namespace xyz::openbmc_project::Logging::SEL;
    auto entryID = report<SELCreated>(
        Created::RECORD_TYPE(selSystemType), Created::GENERATOR_ID(genId),
        Created::SENSOR_DATA(selDataStr.c_str()), Created::EVENT_DIR(assert),
        Created::SENSOR_PATH(path.c_str()));
    return static_cast<uint16_t>(entryID);
#else
    unsigned int recordId = getNewRecordId();
    sd_journal_send("MESSAGE=%s", message.c_str(), "PRIORITY=%i", selPriority,
                    "MESSAGE_ID=%s", selMessageId, "IPMI_SEL_RECORD_ID=%d",
                    recordId, "IPMI_SEL_RECORD_TYPE=%x", selSystemType,
                    "IPMI_SEL_GENERATOR_ID=%x", genId,
                    "IPMI_SEL_SENSOR_PATH=%s", path.c_str(),
                    "IPMI_SEL_EVENT_DIR=%x", assert, "IPMI_SEL_DATA=%s",
                    selDataStr.c_str(), std::forward<T>(metadata)..., NULL);
    return recordId;
#endif
}

static uint16_t selAddOemRecord([[maybe_unused]] const std::string& message,
                                const std::vector<uint8_t>& selData,
                                const uint8_t& recordType)
{
    // A maximum of 13 bytes of SEL event data are allowed in an OEM record
    if (selData.size() > selOemDataMaxSize)
    {
        throw std::invalid_argument("Event data too large");
    }
    std::string selDataStr;
    toHexStr(selData, selDataStr);

#ifdef SEL_LOGGER_SEND_TO_LOGGING_SERVICE
    using namespace xyz::openbmc_project::Logging::SEL;
    auto entryID = report<SELCreated>(
        Created::RECORD_TYPE(recordType), Created::GENERATOR_ID(0),
        Created::SENSOR_DATA(selDataStr.c_str()), Created::EVENT_DIR(0),
        Created::SENSOR_PATH(""));
    return static_cast<uint16_t>(entryID);
#else
    unsigned int recordId = getNewRecordId();
    sd_journal_send("MESSAGE=%s", message.c_str(), "PRIORITY=%i", selPriority,
                    "MESSAGE_ID=%s", selMessageId, "IPMI_SEL_RECORD_ID=%d",
                    recordId, "IPMI_SEL_RECORD_TYPE=%x", recordType,
                    "IPMI_SEL_DATA=%s", selDataStr.c_str(), NULL);
    return recordId;
#endif
}

int main(int, char*[])
{
    // setup connection to dbus
    boost::asio::io_service io;
    auto conn = std::make_shared<sdbusplus::asio::connection>(io);

    // IPMI SEL Object
    conn->request_name(ipmiSelObject);
    auto server = sdbusplus::asio::object_server(conn);

    // Add SEL Interface
    std::shared_ptr<sdbusplus::asio::dbus_interface> ifaceAddSel =
        server.add_interface(ipmiSelPath, ipmiSelAddInterface);

    // Add a new SEL entry
    ifaceAddSel->register_method(
        "IpmiSelAdd", [](const std::string& message, const std::string& path,
                         const std::vector<uint8_t>& selData,
                         const bool& assert, const uint16_t& genId) {
            return selAddSystemRecord(message, path, selData, assert, genId);
        });
    // Add a new OEM SEL entry
    ifaceAddSel->register_method(
        "IpmiSelAddOem",
        [](const std::string& message, const std::vector<uint8_t>& selData,
           const uint8_t& recordType) {
            return selAddOemRecord(message, selData, recordType);
        });

#ifdef SEL_LOGGER_CLEARS_SEL
#ifndef SEL_LOGGER_SEND_TO_LOGGING_SERVICE
    // Clear SEL entries
    ifaceAddSel->register_method("Clear", []() { clearSelLogFiles(); });
#endif
#endif
    ifaceAddSel->initialize();

#ifdef SEL_LOGGER_MONITOR_THRESHOLD_EVENTS
    sdbusplus::bus::match::match thresholdAssertMonitor =
        startThresholdAssertMonitor(conn);
#endif

#ifdef REDFISH_LOG_MONITOR_PULSE_EVENTS
    sdbusplus::bus::match::match pulseEventMonitor =
        startPulseEventMonitor(conn);
#endif

#ifdef SEL_LOGGER_MONITOR_WATCHDOG_EVENTS
    sdbusplus::bus::match::match watchdogEventMonitor =
        startWatchdogEventMonitor(conn);
#endif

#ifdef SEL_LOGGER_MONITOR_THRESHOLD_ALARM_EVENTS
    startThresholdAlarmMonitor(conn);
#endif
    io.run();

    return 0;
}