#include "report.hpp"

#include "report_manager.hpp"
#include "utils/clock.hpp"
#include "utils/contains.hpp"
#include "utils/transform.hpp"

#include <phosphor-logging/log.hpp>
#include <sdbusplus/vtable.hpp>

#include <limits>
#include <numeric>

Report::Report(boost::asio::io_context& ioc,
               const std::shared_ptr<sdbusplus::asio::object_server>& objServer,
               const std::string& reportId, const std::string& reportName,
               const ReportingType reportingTypeIn,
               std::vector<ReportAction> reportActionsIn,
               const Milliseconds intervalIn, const uint64_t appendLimitIn,
               const ReportUpdates reportUpdatesIn,
               interfaces::ReportManager& reportManager,
               interfaces::JsonStorage& reportStorageIn,
               std::vector<std::shared_ptr<interfaces::Metric>> metricsIn,
               const bool enabledIn) :
    id(reportId),
    name(reportName), reportingType(reportingTypeIn), interval(intervalIn),
    reportActions(std::move(reportActionsIn)),
    sensorCount(getSensorCount(metricsIn)),
    appendLimit(deduceAppendLimit(appendLimitIn)),
    reportUpdates(reportUpdatesIn),
    readingsBuffer(deduceBufferSize(reportUpdates, reportingType)),
    objServer(objServer), metrics(std::move(metricsIn)), timer(ioc),
    reportStorage(reportStorageIn), enabled(enabledIn)
{
    readingParameters =
        toReadingParameters(utils::transform(metrics, [](const auto& metric) {
            return metric->dumpConfiguration();
        }));

    readingParametersPastVersion =
        utils::transform(readingParameters, [](const auto& item) {
            const auto& [sensorData, operationType, id, collectionTimeScope,
                         collectionDuration] = item;

            return ReadingParametersPastVersion::value_type(
                std::get<0>(sensorData.front()), operationType, id,
                std::get<1>(sensorData.front()));
        });

    deleteIface = objServer->add_unique_interface(
        getPath(), deleteIfaceName,
        [this, &ioc, &reportManager](auto& dbusIface) {
            dbusIface.register_method("Delete", [this, &ioc, &reportManager] {
                if (persistency)
                {
                    reportStorage.remove(fileName());
                }
                boost::asio::post(ioc, [this, &reportManager] {
                    reportManager.removeReport(this);
                });
            });
        });

    persistency = storeConfiguration();
    reportIface = makeReportInterface();

    if (reportingType == ReportingType::periodic)
    {
        scheduleTimer(interval);
    }

    if (enabled)
    {
        for (auto& metric : this->metrics)
        {
            metric->initialize();
        }
    }
}

uint64_t Report::getSensorCount(
    std::vector<std::shared_ptr<interfaces::Metric>>& metrics)
{
    uint64_t sensorCount = 0;
    for (auto& metric : metrics)
    {
        sensorCount += metric->sensorCount();
    }
    return sensorCount;
}

uint64_t Report::deduceAppendLimit(const uint64_t appendLimitIn) const
{
    if (appendLimitIn == std::numeric_limits<uint64_t>::max())
    {
        return sensorCount;
    }
    else
    {
        return appendLimitIn;
    }
}

uint64_t Report::deduceBufferSize(const ReportUpdates reportUpdatesIn,
                                  const ReportingType reportingTypeIn) const
{
    if (reportUpdatesIn == ReportUpdates::overwrite ||
        reportingTypeIn == ReportingType::onRequest)
    {
        return sensorCount;
    }
    else
    {
        return appendLimit;
    }
}

void Report::setReportUpdates(const ReportUpdates newReportUpdates)
{
    if (reportUpdates != newReportUpdates)
    {
        if (reportingType != ReportingType::onRequest &&
            (reportUpdates == ReportUpdates::overwrite ||
             newReportUpdates == ReportUpdates::overwrite))
        {
            readingsBuffer.clearAndResize(
                deduceBufferSize(newReportUpdates, reportingType));
        }
        reportUpdates = newReportUpdates;
    }
}

std::unique_ptr<sdbusplus::asio::dbus_interface> Report::makeReportInterface()
{
    auto dbusIface =
        objServer->add_unique_interface(getPath(), reportIfaceName);
    dbusIface->register_property_rw(
        "Enabled", enabled, sdbusplus::vtable::property_::emits_change,
        [this](bool newVal, const auto&) {
            if (newVal != enabled)
            {
                if (true == newVal && ReportingType::periodic == reportingType)
                {
                    scheduleTimer(interval);
                }
                if (newVal)
                {
                    for (auto& metric : metrics)
                    {
                        metric->initialize();
                    }
                }
                else
                {
                    for (auto& metric : metrics)
                    {
                        metric->deinitialize();
                    }
                }

                enabled = newVal;
                persistency = storeConfiguration();
            }
            return 1;
        },
        [this](const auto&) { return enabled; });
    dbusIface->register_property_rw(
        "Interval", interval.count(),
        sdbusplus::vtable::property_::emits_change,
        [this](uint64_t newVal, auto&) {
            if (Milliseconds newValT{newVal};
                newValT >= ReportManager::minInterval)
            {
                if (newValT != interval)
                {
                    interval = newValT;
                    persistency = storeConfiguration();
                }
                return 1;
            }
            throw sdbusplus::exception::SdBusError(
                static_cast<int>(std::errc::invalid_argument),
                "Invalid interval");
        },
        [this](const auto&) { return interval.count(); });
    dbusIface->register_property_rw(
        "Persistency", persistency, sdbusplus::vtable::property_::emits_change,
        [this](bool newVal, const auto&) {
            if (newVal == persistency)
            {
                return 1;
            }
            if (newVal)
            {
                persistency = storeConfiguration();
            }
            else
            {
                reportStorage.remove(fileName());
                persistency = false;
            }
            return 1;
        },
        [this](const auto&) { return persistency; });

    auto readingsFlag = sdbusplus::vtable::property_::none;
    if (utils::contains(reportActions, ReportAction::emitsReadingsUpdate))
    {
        readingsFlag = sdbusplus::vtable::property_::emits_change;
    }
    dbusIface->register_property_r("Readings", readings, readingsFlag,
                                   [this](const auto&) { return readings; });
    dbusIface->register_property_r(
        "ReportingType", std::string(), sdbusplus::vtable::property_::const_,
        [this](const auto&) { return utils::enumToString(reportingType); });
    dbusIface->register_property_r(
        "ReadingParameters", readingParametersPastVersion,
        sdbusplus::vtable::property_::const_,
        [this](const auto&) { return readingParametersPastVersion; });
    dbusIface->register_property_r(
        "ReadingParametersFutureVersion", readingParameters,
        sdbusplus::vtable::property_::const_,
        [this](const auto&) { return readingParameters; });
    dbusIface->register_property_r(
        "EmitsReadingsUpdate", bool{}, sdbusplus::vtable::property_::const_,
        [this](const auto&) {
            return utils::contains(reportActions,
                                   ReportAction::emitsReadingsUpdate);
        });
    dbusIface->register_property_r("Name", std::string{},
                                   sdbusplus::vtable::property_::const_,
                                   [this](const auto&) { return name; });
    dbusIface->register_property_r(
        "LogToMetricReportsCollection", bool{},
        sdbusplus::vtable::property_::const_, [this](const auto&) {
            return utils::contains(reportActions,
                                   ReportAction::logToMetricReportsCollection);
        });
    dbusIface->register_property_r(
        "ReportActions", std::vector<std::string>{},
        sdbusplus::vtable::property_::const_, [this](const auto&) {
            return utils::transform(reportActions, [](const auto reportAction) {
                return utils::enumToString(reportAction);
            });
        });
    dbusIface->register_property_r("AppendLimit", appendLimit,
                                   sdbusplus::vtable::property_::emits_change,
                                   [this](const auto&) { return appendLimit; });
    dbusIface->register_property_rw(
        "ReportUpdates", std::string(),
        sdbusplus::vtable::property_::emits_change,
        [this](auto newVal, auto& oldVal) {
            ReportManager::verifyReportUpdates(utils::toReportUpdates(newVal));
            setReportUpdates(utils::toReportUpdates(newVal));
            oldVal = newVal;
            return 1;
        },
        [this](const auto&) { return utils::enumToString(reportUpdates); });
    dbusIface->register_method("Update", [this] {
        if (reportingType == ReportingType::onRequest)
        {
            updateReadings();
        }
    });
    constexpr bool skipPropertiesChangedSignal = true;
    dbusIface->initialize(skipPropertiesChangedSignal);
    return dbusIface;
}

void Report::timerProc(boost::system::error_code ec, Report& self)
{
    if (ec)
    {
        return;
    }

    self.updateReadings();
    self.scheduleTimer(self.interval);
}

void Report::scheduleTimer(Milliseconds timerInterval)
{
    timer.expires_after(timerInterval);
    timer.async_wait(
        [this](boost::system::error_code ec) { timerProc(ec, *this); });
}

void Report::updateReadings()
{
    if (!enabled)
    {
        return;
    }

    if (reportUpdates == ReportUpdates::overwrite ||
        reportingType == ReportingType::onRequest)
    {
        readingsBuffer.clear();
    }

    for (const auto& metric : metrics)
    {
        for (const auto& [id, metadata, value, timestamp] :
             metric->getReadings())
        {
            if (reportUpdates == ReportUpdates::appendStopsWhenFull &&
                readingsBuffer.isFull())
            {
                enabled = false;
                for (auto& metric : metrics)
                {
                    metric->deinitialize();
                }
                break;
            }
            readingsBuffer.emplace(id, metadata, value, timestamp);
        }
    }

    readings = {
        Clock().timestamp(),
        std::vector<ReadingData>(readingsBuffer.begin(), readingsBuffer.end())};

    reportIface->signal_property("Readings");
}

bool Report::storeConfiguration() const
{
    try
    {
        nlohmann::json data;

        data["Enabled"] = enabled;
        data["Version"] = reportVersion;
        data["Id"] = id;
        data["Name"] = name;
        data["ReportingType"] = utils::toUnderlying(reportingType);
        data["ReportActions"] =
            utils::transform(reportActions, [](const auto reportAction) {
                return utils::toUnderlying(reportAction);
            });
        data["Interval"] = interval.count();
        data["AppendLimit"] = appendLimit;
        data["ReportUpdates"] = utils::toUnderlying(reportUpdates);
        data["ReadingParameters"] =
            utils::transform(metrics, [](const auto& metric) {
                return metric->dumpConfiguration();
            });

        reportStorage.store(fileName(), data);
    }
    catch (const std::exception& e)
    {
        phosphor::logging::log<phosphor::logging::level::ERR>(
            "Failed to store a report in storage",
            phosphor::logging::entry("EXCEPTION_MSG=%s", e.what()));
        return false;
    }

    return true;
}
interfaces::JsonStorage::FilePath Report::fileName() const
{
    return interfaces::JsonStorage::FilePath{
        std::to_string(std::hash<std::string>{}(id))};
}