/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwindowsysteminterface_qpa.h"
#include "qwindowsysteminterface_qpa_p.h"
#include "private/qguiapplication_p.h"
#include "private/qtouchdevice_p.h"
#include <QAbstractEventDispatcher>
#include <qdebug.h>

QT_BEGIN_NAMESPACE


QTime QWindowSystemInterfacePrivate::eventTime;

//------------------------------------------------------------
//
// Callback functions for plugins:
//

QList<QWindowSystemInterfacePrivate::WindowSystemEvent *> QWindowSystemInterfacePrivate::windowSystemEventQueue;
QMutex QWindowSystemInterfacePrivate::queueMutex;

extern QPointer<QWindow> qt_last_mouse_receiver;


void QWindowSystemInterface::handleEnterEvent(QWindow *tlw)
{
    if (tlw) {
        QWindowSystemInterfacePrivate::EnterEvent *e = new QWindowSystemInterfacePrivate::EnterEvent(tlw);
        QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
    }
}

void QWindowSystemInterface::handleLeaveEvent(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::LeaveEvent *e = new QWindowSystemInterfacePrivate::LeaveEvent(tlw);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWindowActivated(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::ActivatedWindowEvent *e = new QWindowSystemInterfacePrivate::ActivatedWindowEvent(tlw);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWindowStateChanged(QWindow *tlw, Qt::WindowState newState)
{
    QWindowSystemInterfacePrivate::WindowStateChangedEvent *e =
        new QWindowSystemInterfacePrivate::WindowStateChangedEvent(tlw, newState);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleGeometryChange(QWindow *tlw, const QRect &newRect)
{
    QWindowSystemInterfacePrivate::GeometryChangeEvent *e = new QWindowSystemInterfacePrivate::GeometryChangeEvent(tlw,newRect);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleSynchronousGeometryChange(QWindow *tlw, const QRect &newRect)
{
    QWindowSystemInterfacePrivate::GeometryChangeEvent e(tlw,newRect);
    QGuiApplicationPrivate::processWindowSystemEvent(&e); // send event immediately.
}

void QWindowSystemInterface::handleCloseEvent(QWindow *tlw)
{
    if (tlw) {
        QWindowSystemInterfacePrivate::CloseEvent *e =
                new QWindowSystemInterfacePrivate::CloseEvent(tlw);
        QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
    }
}

void QWindowSystemInterface::handleSynchronousCloseEvent(QWindow *tlw)
{
    if (tlw) {
        QWindowSystemInterfacePrivate::CloseEvent e(tlw);
        QGuiApplicationPrivate::processWindowSystemEvent(&e);
    }
}

/*!

\a tlw == 0 means that \a ev is in global coords only


*/
void QWindowSystemInterface::handleMouseEvent(QWindow *w, const QPointF & local, const QPointF & global, Qt::MouseButtons b, Qt::KeyboardModifiers mods) {
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleMouseEvent(w, time, local, global, b, mods);
}

void QWindowSystemInterface::handleMouseEvent(QWindow *tlw, ulong timestamp, const QPointF & local, const QPointF & global, Qt::MouseButtons b, Qt::KeyboardModifiers mods)
{
    QWindowSystemInterfacePrivate::MouseEvent * e =
            new QWindowSystemInterfacePrivate::MouseEvent(tlw, timestamp, local, global, b, mods);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleKeyEvent(QWindow *w, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text, bool autorep, ushort count) {
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleKeyEvent(w, time, t, k, mods, text, autorep, count);
}

void QWindowSystemInterface::handleKeyEvent(QWindow *tlw, ulong timestamp, QEvent::Type t, int k, Qt::KeyboardModifiers mods, const QString & text, bool autorep, ushort count)
{
    QWindowSystemInterfacePrivate::KeyEvent * e =
            new QWindowSystemInterfacePrivate::KeyEvent(tlw, timestamp, t, k, mods, text, autorep, count);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleExtendedKeyEvent(QWindow *w, QEvent::Type type, int key, Qt::KeyboardModifiers modifiers,
                                                    quint32 nativeScanCode, quint32 nativeVirtualKey,
                                                    quint32 nativeModifiers,
                                                    const QString& text, bool autorep,
                                                    ushort count)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleExtendedKeyEvent(w, time, type, key, modifiers, nativeScanCode, nativeVirtualKey, nativeModifiers,
                           text, autorep, count);
}

void QWindowSystemInterface::handleExtendedKeyEvent(QWindow *tlw, ulong timestamp, QEvent::Type type, int key,
                                                    Qt::KeyboardModifiers modifiers,
                                                    quint32 nativeScanCode, quint32 nativeVirtualKey,
                                                    quint32 nativeModifiers,
                                                    const QString& text, bool autorep,
                                                    ushort count)
{
    QWindowSystemInterfacePrivate::KeyEvent * e =
            new QWindowSystemInterfacePrivate::KeyEvent(tlw, timestamp, type, key, modifiers,
                nativeScanCode, nativeVirtualKey, nativeModifiers, text, autorep, count);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *w, const QPointF & local, const QPointF & global, int d, Qt::Orientation o, Qt::KeyboardModifiers mods) {
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleWheelEvent(w, time, local, global, d, o, mods);
}

void QWindowSystemInterface::handleWheelEvent(QWindow *tlw, ulong timestamp, const QPointF & local, const QPointF & global, int d, Qt::Orientation o, Qt::KeyboardModifiers mods)
{
    QWindowSystemInterfacePrivate::WheelEvent *e =
            new QWindowSystemInterfacePrivate::WheelEvent(tlw, timestamp, local, global, d, o, mods);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

int QWindowSystemInterfacePrivate::windowSystemEventsQueued()
{
    queueMutex.lock();
    int ret = windowSystemEventQueue.count();
    queueMutex.unlock();
    return ret;
}

QWindowSystemInterfacePrivate::WindowSystemEvent * QWindowSystemInterfacePrivate::getWindowSystemEvent()
{
    queueMutex.lock();
    QWindowSystemInterfacePrivate::WindowSystemEvent *ret;
    if (windowSystemEventQueue.isEmpty())
        ret = 0;
    else
        ret = windowSystemEventQueue.takeFirst();
    queueMutex.unlock();
    return ret;
}

void QWindowSystemInterfacePrivate::queueWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent *ev)
{
    queueMutex.lock();
    windowSystemEventQueue.append(ev);
    queueMutex.unlock();

    QAbstractEventDispatcher *dispatcher = QGuiApplicationPrivate::qt_qpa_core_dispatcher();
    if (dispatcher)
        dispatcher->wakeUp();
}

void QWindowSystemInterface::registerTouchDevice(QTouchDevice *device)
{
    QTouchDevicePrivate::registerDevice(device);
}

void QWindowSystemInterface::handleTouchEvent(QWindow *w, QTouchDevice *device,
                                              const QList<TouchPoint> &points, Qt::KeyboardModifiers mods)
{
    unsigned long time = QWindowSystemInterfacePrivate::eventTime.elapsed();
    handleTouchEvent(w, time, device, points, mods);
}

QList<QTouchEvent::TouchPoint> QWindowSystemInterfacePrivate::convertTouchPoints(const QList<QWindowSystemInterface::TouchPoint> &points, QEvent::Type *type)
{
    QList<QTouchEvent::TouchPoint> touchPoints;
    Qt::TouchPointStates states;
    QTouchEvent::TouchPoint p;

    QList<QWindowSystemInterface::TouchPoint>::const_iterator point = points.constBegin();
    QList<QWindowSystemInterface::TouchPoint>::const_iterator end = points.constEnd();
    while (point != end) {
        p.setId(point->id);
        p.setPressure(point->pressure);
        states |= point->state;
        p.setState(point->state);

        const QPointF screenPos = point->area.center();
        p.setScreenPos(screenPos);
        p.setScreenRect(point->area);

        // The local pos and rect are not set, they will be calculated
        // when the event gets processed by QGuiApplication.

        p.setNormalizedPos(point->normalPosition);
        p.setVelocity(point->velocity);
        p.setFlags(point->flags);
        p.setRawScreenPositions(point->rawPositions);

        touchPoints.append(p);
        ++point;
    }

    // Determine the event type based on the combined point states.
    if (type) {
        *type = QEvent::TouchUpdate;
        if (states == Qt::TouchPointPressed)
            *type = QEvent::TouchBegin;
        else if (states == Qt::TouchPointReleased)
            *type = QEvent::TouchEnd;
    }

    return touchPoints;
}

void QWindowSystemInterface::handleTouchEvent(QWindow *tlw, ulong timestamp, QTouchDevice *device,
                                              const QList<TouchPoint> &points, Qt::KeyboardModifiers mods)
{
    if (!points.size()) // Touch events must have at least one point
        return;

    if (!QTouchDevicePrivate::isRegistered(device)) // Disallow passing bogus, non-registered devices.
        return;

    QEvent::Type type;
    QList<QTouchEvent::TouchPoint> touchPoints = QWindowSystemInterfacePrivate::convertTouchPoints(points, &type);

    QWindowSystemInterfacePrivate::TouchEvent *e =
            new QWindowSystemInterfacePrivate::TouchEvent(tlw, timestamp, type, device, touchPoints, mods);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenOrientationChange(QScreen *screen, Qt::ScreenOrientation orientation)
{
    QWindowSystemInterfacePrivate::ScreenOrientationEvent *e =
            new QWindowSystemInterfacePrivate::ScreenOrientationEvent(screen, orientation);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenGeometryChange(QScreen *screen, const QRect &geometry)
{
    QWindowSystemInterfacePrivate::ScreenGeometryEvent *e =
            new QWindowSystemInterfacePrivate::ScreenGeometryEvent(screen, geometry);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenAvailableGeometryChange(QScreen *screen, const QRect &availableGeometry)
{
    QWindowSystemInterfacePrivate::ScreenAvailableGeometryEvent *e =
            new QWindowSystemInterfacePrivate::ScreenAvailableGeometryEvent(screen, availableGeometry);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(QScreen *screen, qreal dpiX, qreal dpiY)
{
    QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent *e =
            new QWindowSystemInterfacePrivate::ScreenLogicalDotsPerInchEvent(screen, dpiX, dpiY);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleMapEvent(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::MapEvent *e = new QWindowSystemInterfacePrivate::MapEvent(tlw);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleUnmapEvent(QWindow *tlw)
{
    QWindowSystemInterfacePrivate::UnmapEvent *e = new QWindowSystemInterfacePrivate::UnmapEvent(tlw);
    QWindowSystemInterfacePrivate::queueWindowSystemEvent(e);
}

void QWindowSystemInterface::handleSynchronousExposeEvent(QWindow *tlw, const QRegion &region)
{
    QWindowSystemInterfacePrivate::ExposeEvent e(tlw, region);
    QGuiApplicationPrivate::processWindowSystemEvent(&e); // send event immediately.
}

bool QWindowSystemInterface::sendWindowSystemEvents(QAbstractEventDispatcher *eventDispatcher, QEventLoop::ProcessEventsFlags flags)
{
    int nevents = 0;

    // handle gui and posted events
    QCoreApplication::sendPostedEvents();

    while (true) {
        QWindowSystemInterfacePrivate::WindowSystemEvent *event;
        if (!(flags & QEventLoop::ExcludeUserInputEvents)
            && QWindowSystemInterfacePrivate::windowSystemEventsQueued() > 0) {
            // process a pending user input event
            event = QWindowSystemInterfacePrivate::getWindowSystemEvent();
            if (!event)
                break;
        } else {
            break;
        }

        if (eventDispatcher->filterEvent(event)) {
            delete event;
            continue;
        }

        nevents++;

        QGuiApplicationPrivate::processWindowSystemEvent(event);
        delete event;
    }

    return (nevents > 0);
}

int QWindowSystemInterface::windowSystemEventsQueued()
{
    return QWindowSystemInterfacePrivate::windowSystemEventsQueued();
}

Qt::DropAction QWindowSystemInterface::handleDrag(QWindow *w, QMimeData *dropData, const QPoint &p)
{
    return QGuiApplicationPrivate::processDrag(w, dropData, p);
}

Qt::DropAction QWindowSystemInterface::handleDrop(QWindow *w, QMimeData *dropData, const QPoint &p)
{
    return QGuiApplicationPrivate::processDrop(w, dropData, p);
}

QT_END_NAMESPACE