/*
    SPDX-FileCopyrightText: 2015 Eike Hein <hein@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "systementry.h"

#include <QDBusConnection>
#include <QDBusInterface>
#include <QDBusPendingCall>

#include <KAuthorized>
#include <KConfigGroup>
#include <KLocalizedString>
#include <KSharedConfig>
#include <sessionmanagement.h>

int SystemEntry::s_instanceCount = 0;
SessionManagement *SystemEntry::s_sessionManagement = nullptr;

SystemEntry::SystemEntry(AbstractModel *owner, Action action)
    : AbstractEntry(owner)
    , m_initialized(false)
    , m_action(action)
    , m_valid(false)
{
    refresh();
    ++s_instanceCount;
    m_initialized = true;
}

SystemEntry::SystemEntry(AbstractModel *owner, const QString &id)
    : AbstractEntry(owner)
    , m_initialized(false)
    , m_action(NoAction)
    , m_valid(false)
{
    if (id == QLatin1String("lock-screen")) {
        m_action = LockSession;
    } else if (id == QLatin1String("logout")) {
        m_action = LogoutSession;
    } else if (id == QLatin1String("save-session")) {
        m_action = SaveSession;
    } else if (id == QLatin1String("switch-user")) {
        m_action = SwitchUser;
    } else if (id == QLatin1String("suspend")) {
        m_action = Suspend;
    } else if (id == QLatin1String("hibernate")) {
        m_action = Hibernate;
    } else if (id == QLatin1String("reboot")) {
        m_action = Reboot;
    } else if (id == QLatin1String("shutdown")) {
        m_action = Shutdown;
    }

    refresh();
    ++s_instanceCount;
    m_initialized = true;
}

SystemEntry::~SystemEntry()
{
    --s_instanceCount;

    if (!s_instanceCount) {
        delete s_sessionManagement;
        s_sessionManagement = nullptr;
    }
}

SystemEntry::Action SystemEntry::action() const
{
    return m_action;
}

void SystemEntry::refresh()
{
    if (!s_sessionManagement) {
        s_sessionManagement = new SessionManagement();
        QObject::connect(s_sessionManagement, &SessionManagement::stateChanged, this, &SystemEntry::sessionManagementStateChanged);
    }

    bool valid = false;

    switch (m_action) {
    case LockSession: {
        valid = s_sessionManagement->canLock();
        QObject::connect(s_sessionManagement, &SessionManagement::canLockChanged, this, &SystemEntry::refresh);
        break;
    }
    case LogoutSession: {
        valid = s_sessionManagement->canLogout();
        QObject::connect(s_sessionManagement, &SessionManagement::canLogoutChanged, this, &SystemEntry::refresh);
        break;
    }
    case SaveSession: {
        valid = s_sessionManagement->canSaveSession();
        QObject::connect(s_sessionManagement, &SessionManagement::canSaveSessionChanged, this, &SystemEntry::refresh);
        break;
    }
    case SwitchUser: {
        valid = s_sessionManagement->canSwitchUser();
        QObject::connect(s_sessionManagement, &SessionManagement::canSwitchUserChanged, this, &SystemEntry::refresh);
        break;
    }
    case Suspend: {
        valid = s_sessionManagement->canSuspend();
        QObject::connect(s_sessionManagement, &SessionManagement::canSuspendChanged, this, &SystemEntry::refresh);
        break;
    }
    case Hibernate: {
        valid = s_sessionManagement->canHibernate();
        QObject::connect(s_sessionManagement, &SessionManagement::canHibernateChanged, this, &SystemEntry::refresh);
        break;
    }
    case Reboot: {
        valid = s_sessionManagement->canReboot();
        QObject::connect(s_sessionManagement, &SessionManagement::canRebootChanged, this, &SystemEntry::refresh);
        break;
    }
    case Shutdown: {
        valid = s_sessionManagement->canShutdown();
        QObject::connect(s_sessionManagement, &SessionManagement::canShutdownChanged, this, &SystemEntry::refresh);
        break;
    }
    default:
        break;
    }

    if (m_valid != valid) {
        m_valid = valid;

        if (m_initialized) {
            Q_EMIT isValidChanged();
        }
    }
}

bool SystemEntry::isValid() const
{
    return m_valid;
}

QString SystemEntry::icon() const
{
    const QString &name = iconName();

    if (!name.isEmpty()) {
        return name;
    }

    return QStringLiteral("unknown");
}

QString SystemEntry::iconName() const
{
    switch (m_action) {
    case LockSession:
        return QStringLiteral("system-lock-screen");
        break;
    case LogoutSession:
        return QStringLiteral("system-log-out");
        break;
    case SaveSession:
        return QStringLiteral("system-save-session");
        break;
    case SwitchUser:
        return QStringLiteral("system-switch-user");
        break;
    case Suspend:
        return QStringLiteral("system-suspend");
        break;
    case Hibernate:
        return QStringLiteral("system-suspend-hibernate");
        break;
    case Reboot:
        return QStringLiteral("system-reboot");
        break;
    case Shutdown:
        return QStringLiteral("system-shutdown");
        break;
    default:
        break;
    }

    return QString();
}

QString SystemEntry::name() const
{
    switch (m_action) {
    case LockSession:
        return i18n("Lock");
        break;
    case LogoutSession:
        return i18n("Log Out");
        break;
    case SaveSession:
        return i18n("Save Session");
        break;
    case SwitchUser:
        return i18n("Switch User");
        break;
    case Suspend:
        return i18nc("Suspend to RAM", "Sleep");
        break;
    case Hibernate:
        return i18n("Hibernate");
        break;
    case Reboot:
        return i18n("Restart");
        break;
    case Shutdown:
        return i18n("Shut Down");
        break;
    default:
        break;
    }

    return QString();
}

QString SystemEntry::group() const
{
    switch (m_action) {
    case LockSession:
    case LogoutSession:
    case SaveSession:
    case SwitchUser:
        return i18n("Session");
    case Suspend:
    case Hibernate:
    case Reboot:
    case Shutdown:
        return i18n("System");
    default:
        break;
    }

    return QString();
}

QString SystemEntry::description() const
{
    switch (m_action) {
    case LockSession:
        return i18n("Lock screen");
        break;
    case LogoutSession:
        return i18n("End session");
        break;
    case SaveSession:
        return i18n("Save Session");
        break;
    case SwitchUser:
        return i18n("Start a parallel session as a different user");
        break;
    case Suspend:
        return i18n("Suspend to RAM");
        break;
    case Hibernate:
        return i18n("Suspend to disk");
        break;
    case Reboot:
        return i18n("Restart computer");
        break;
    case Shutdown:
        return i18n("Turn off computer");
        break;
    default:
        break;
    }

    return QString();
}

QString SystemEntry::id() const
{
    switch (m_action) {
    case LockSession:
        return QStringLiteral("lock-screen");
        break;
    case LogoutSession:
        return QStringLiteral("logout");
        break;
    case SaveSession:
        return QStringLiteral("save-session");
        break;
    case SwitchUser:
        return QStringLiteral("switch-user");
        break;
    case Suspend:
        return QStringLiteral("suspend");
        break;
    case Hibernate:
        return QStringLiteral("hibernate");
        break;
    case Reboot:
        return QStringLiteral("reboot");
        break;
    case Shutdown:
        return QStringLiteral("shutdown");
        break;

    default:
        break;
    }

    return QString();
}

bool SystemEntry::run(const QString &actionId, const QVariant &argument)
{
    Q_UNUSED(actionId)
    Q_UNUSED(argument)

    if (!m_valid) {
        return false;
    }

    switch (m_action) {
    case LockSession:
        s_sessionManagement->lock();
        break;
    case LogoutSession:
        s_sessionManagement->requestLogout();
        break;
    case SaveSession:
        s_sessionManagement->saveSession();
        break;
    case SwitchUser:
        s_sessionManagement->switchUser();
        break;
    case Suspend:
        s_sessionManagement->suspend();
        break;
    case Hibernate:
        s_sessionManagement->hibernate();
        break;
    case Reboot:
        s_sessionManagement->requestReboot();
        break;
    case Shutdown:
        s_sessionManagement->requestShutdown();
        break;
    default:
        break;
    }

    return true;
}