/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QT_NO_SYSTEMTRAYICON

#include "qdbustrayicon_p.h"
#include "qdbusmenuconnection_p.h"
#include "qstatusnotifieritemadaptor_p.h"
#include "qdbusmenuadaptor_p.h"
#include "dbusmenu/qdbusplatformmenu_p.h"
#include "qxdgnotificationproxy_p.h"

#include <qplatformmenu.h>
#include <qstring.h>
#include <qdebug.h>
#include <qrect.h>
#include <qloggingcategory.h>
#include <qplatformintegration.h>
#include <qplatformservices.h>
#include <qdbusconnectioninterface.h>
#include <private/qlockfile_p.h>
#include <private/qguiapplication_p.h>

// Defined in Windows headers which get included by qlockfile_p.h
#undef interface

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(qLcTray, "qt.qpa.tray")

static const QString KDEItemFormat = QStringLiteral("org.kde.StatusNotifierItem-%1-%2");
static const QString KDEWatcherService = QStringLiteral("org.kde.StatusNotifierWatcher");
static const QString TempFileTemplate =  QDir::tempPath() + QLatin1String("/qt-trayicon-XXXXXX.png");
static const QString XdgNotificationService = QStringLiteral("org.freedesktop.Notifications");
static const QString XdgNotificationPath = QStringLiteral("/org/freedesktop/Notifications");
static const QString DefaultAction = QStringLiteral("default");
static int instanceCount = 0;

/*!
    \class QDBusTrayIcon
    \internal
*/

QDBusTrayIcon::QDBusTrayIcon()
    : m_dbusConnection(Q_NULLPTR)
    , m_adaptor(new QStatusNotifierItemAdaptor(this))
    , m_menuAdaptor(Q_NULLPTR)
    , m_menu(Q_NULLPTR)
    , m_notifier(Q_NULLPTR)
    , m_instanceId(KDEItemFormat.arg(QCoreApplication::applicationPid()).arg(++instanceCount))
    , m_category(QStringLiteral("ApplicationStatus"))
    , m_defaultStatus(QStringLiteral("Active")) // be visible all the time.  QSystemTrayIcon has no API to control this.
    , m_status(m_defaultStatus)
    , m_tempIcon(Q_NULLPTR)
    , m_tempAttentionIcon(Q_NULLPTR)
    , m_registered(false)
{
    qCDebug(qLcTray);
    if (instanceCount == 1) {
        QDBusMenuItem::registerDBusTypes();
        qDBusRegisterMetaType<QXdgDBusImageStruct>();
        qDBusRegisterMetaType<QXdgDBusImageVector>();
        qDBusRegisterMetaType<QXdgDBusToolTipStruct>();
    }
    connect(this, SIGNAL(statusChanged(QString)), m_adaptor, SIGNAL(NewStatus(QString)));
    connect(this, SIGNAL(tooltipChanged()), m_adaptor, SIGNAL(NewToolTip()));
    connect(this, SIGNAL(iconChanged()), m_adaptor, SIGNAL(NewIcon()));
    connect(this, SIGNAL(attention()), m_adaptor, SIGNAL(NewAttentionIcon()));
    connect(this, SIGNAL(attention()), m_adaptor, SIGNAL(NewTitle()));
    connect(&m_attentionTimer, SIGNAL(timeout()), this, SLOT(attentionTimerExpired()));
    m_attentionTimer.setSingleShot(true);
}

QDBusTrayIcon::~QDBusTrayIcon()
{
}

void QDBusTrayIcon::init()
{
    qCDebug(qLcTray) << "registering" << m_instanceId;
    m_registered = dBusConnection()->registerTrayIcon(this);
}

void QDBusTrayIcon::cleanup()
{
    qCDebug(qLcTray) << "unregistering" << m_instanceId;
    if (m_registered)
        dBusConnection()->unregisterTrayIcon(this);
    delete m_dbusConnection;
    m_dbusConnection = Q_NULLPTR;
    delete m_notifier;
    m_notifier = Q_NULLPTR;
    m_registered = false;
}

void QDBusTrayIcon::attentionTimerExpired()
{
    m_messageTitle = QString();
    m_message = QString();
    m_attentionIcon = QIcon();
    emit attention();
    emit tooltipChanged();
    setStatus(m_defaultStatus);
}

void QDBusTrayIcon::setStatus(const QString &status)
{
    qCDebug(qLcTray) << status;
    if (m_status == status)
        return;
    m_status = status;
    emit statusChanged(m_status);
}

QTemporaryFile *QDBusTrayIcon::tempIcon(const QIcon &icon)
{
    // Hack for indicator-application, which doesn't handle icons sent across D-Bus:
    // save the icon to a temp file and set the icon name to that filename.
    static bool necessity_checked = false;
    static bool necessary = false;
    if (!necessity_checked) {
        QDBusConnection session = QDBusConnection::sessionBus();
        uint pid = session.interface()->servicePid(KDEWatcherService).value();
        QString processName = QLockFilePrivate::processNameByPid(pid);
        necessary = processName.endsWith(QLatin1String("indicator-application-service"));
        necessity_checked = true;
    }
    if (!necessary)
        return Q_NULLPTR;
    qreal dpr = qGuiApp->devicePixelRatio();
    QTemporaryFile *ret = new QTemporaryFile(TempFileTemplate, this);
    ret->open();
    icon.pixmap(QSize(22 * dpr, 22 * dpr)).save(ret);
    ret->close();
    return ret;
}

QDBusMenuConnection * QDBusTrayIcon::dBusConnection()
{
    if (!m_dbusConnection) {
        m_dbusConnection = new QDBusMenuConnection(this, m_instanceId);
        m_notifier = new QXdgNotificationInterface(XdgNotificationService,
            XdgNotificationPath, m_dbusConnection->connection(), this);
        connect(m_notifier, SIGNAL(NotificationClosed(uint,uint)), this, SLOT(notificationClosed(uint,uint)));
        connect(m_notifier, SIGNAL(ActionInvoked(uint,QString)), this, SLOT(actionInvoked(uint,QString)));
    }
    return m_dbusConnection;
}

void QDBusTrayIcon::updateIcon(const QIcon &icon)
{
    m_iconName = icon.name();
    m_icon = icon;
    if (m_iconName.isEmpty()) {
        if (m_tempIcon)
            delete m_tempIcon;
        m_tempIcon = tempIcon(icon);
        if (m_tempIcon)
            m_iconName = m_tempIcon->fileName();
    }
    qCDebug(qLcTray) << m_iconName << icon.availableSizes();
    emit iconChanged();
}

void QDBusTrayIcon::updateToolTip(const QString &tooltip)
{
    qCDebug(qLcTray) << tooltip;
    m_tooltip = tooltip;
    emit tooltipChanged();
}

QPlatformMenu *QDBusTrayIcon::createMenu() const
{
    return new QDBusPlatformMenu();
}

void QDBusTrayIcon::updateMenu(QPlatformMenu * menu)
{
    qCDebug(qLcTray) << menu;
    bool needsRegistering = !m_menu;
    if (!m_menu)
        m_menu = qobject_cast<QDBusPlatformMenu *>(menu);
    if (!m_menuAdaptor) {
        m_menuAdaptor = new QDBusMenuAdaptor(m_menu);
        // TODO connect(m_menu, , m_menuAdaptor, SIGNAL(ItemActivationRequested(int,uint)));
        connect(m_menu, SIGNAL(propertiesUpdated(QDBusMenuItemList,QDBusMenuItemKeysList)),
                m_menuAdaptor, SIGNAL(ItemsPropertiesUpdated(QDBusMenuItemList,QDBusMenuItemKeysList)));
        connect(m_menu, SIGNAL(updated(uint,int)),
                m_menuAdaptor, SIGNAL(LayoutUpdated(uint,int)));
    }
    m_menu->emitUpdated();
    if (needsRegistering)
        dBusConnection()->registerTrayIconMenu(this);
}

void QDBusTrayIcon::showMessage(const QString &title, const QString &msg, const QIcon &icon,
                                QPlatformSystemTrayIcon::MessageIcon iconType, int msecs)
{
    m_messageTitle = title;
    m_message = msg;
    m_attentionIcon = icon;
    QStringList notificationActions;
    switch (iconType) {
    case Information:
        m_attentionIconName = QStringLiteral("dialog-information");
        break;
    case Warning:
        m_attentionIconName = QStringLiteral("dialog-warning");
        break;
    case Critical:
        m_attentionIconName = QStringLiteral("dialog-error");
        // If there are actions, the desktop notification may appear as a message dialog
        // with button(s), which will interrupt the user and require a response.
        // That is an optional feature in implementations of org.freedesktop.Notifications
        notificationActions << DefaultAction << tr("OK");
        break;
    default:
        m_attentionIconName.clear();
        break;
    }
    if (m_attentionIconName.isEmpty()) {
        if (m_tempAttentionIcon)
            delete m_tempAttentionIcon;
        m_tempAttentionIcon = tempIcon(icon);
        if (m_tempAttentionIcon)
            m_attentionIconName = m_tempAttentionIcon->fileName();
    }
    qCDebug(qLcTray) << title << msg <<
        QPlatformSystemTrayIcon::metaObject()->enumerator(
            QPlatformSystemTrayIcon::staticMetaObject.indexOfEnumerator("MessageIcon")).valueToKey(iconType)
        << m_attentionIconName << msecs;
    setStatus(QStringLiteral("NeedsAttention"));
    m_attentionTimer.start(msecs);
    emit tooltipChanged();
    emit attention();

    // Desktop notification
    QVariantMap hints;
    // urgency levels according to https://developer.gnome.org/notification-spec/#urgency-levels
    // 0 low, 1 normal, 2 critical
    int urgency = static_cast<int>(iconType) - 1;
    if (urgency < 0) // no icon
        urgency = 0;
    hints.insert(QLatin1String("urgency"), QVariant(urgency));
    m_notifier->notify(QCoreApplication::applicationName(), 0,
                       m_attentionIconName, title, msg, notificationActions, hints, msecs);
}

void QDBusTrayIcon::actionInvoked(uint id, const QString &action)
{
    qCDebug(qLcTray) << id << action;
    emit messageClicked();
}

void QDBusTrayIcon::notificationClosed(uint id, uint reason)
{
    qCDebug(qLcTray) << id << reason;
}

bool QDBusTrayIcon::isSystemTrayAvailable() const
{
    QDBusMenuConnection * conn = const_cast<QDBusTrayIcon *>(this)->dBusConnection();
    qCDebug(qLcTray) << conn->isStatusNotifierHostRegistered();
    return conn->isStatusNotifierHostRegistered();
}

QT_END_NAMESPACE
#endif //QT_NO_SYSTEMTRAYICON