// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "qwlqttouch_p.h"
#include "qwaylandview.h"
#include <QPointingDevice>
#include <QTouchEvent>
#include <QWindow>

QT_BEGIN_NAMESPACE

namespace QtWayland {

static const int maxRawPos = 24;

TouchExtensionGlobal::TouchExtensionGlobal(QWaylandCompositor *compositor)
    : QWaylandCompositorExtensionTemplate(compositor)
    , QtWaylandServer::qt_touch_extension(compositor->display(), 1)
    , m_compositor(compositor)
    , m_posData(maxRawPos * 2)
{
}

TouchExtensionGlobal::~TouchExtensionGlobal()
{
}

static inline int toFixed(qreal f)
{
    return int(f * 10000);
}

bool TouchExtensionGlobal::postTouchEvent(QTouchEvent *event, QWaylandSurface *surface)
{
    const QList<QTouchEvent::TouchPoint> points = event->points();
    const int pointCount = points.count();
    if (!pointCount)
        return false;

    wl_client *surfaceClient = surface->client()->client();
    uint32_t time = m_compositor->currentTimeMsecs();
    const int rescount = m_resources.count();

    for (int res = 0; res < rescount; ++res) {
        Resource *target = m_resources.at(res);
        if (target->client() != surfaceClient)
            continue;

        // We will use no touch_frame type of event, to reduce the number of
        // events flowing through the wire. Instead, the number of points sent is
        // included in the touch point events.
        int sentPointCount = 0;
        for (int i = 0; i < pointCount; ++i) {
            if (points.at(i).state() != QEventPoint::Stationary)
                ++sentPointCount;
        }

        for (int i = 0; i < pointCount; ++i) {
            const QTouchEvent::TouchPoint &tp(points.at(i));
            // Stationary points are never sent. They are cached on client side.
            if (tp.state() == QEventPoint::Stationary)
                continue;

            uint32_t id = tp.id();
            uint32_t state = (tp.state() & 0xFFFF) | (sentPointCount << 16);
            uint32_t flags = (int(event->pointingDevice()->capabilities()) << 16);

            int x = toFixed(tp.position().x());
            int y = toFixed(tp.position().y());
            int nx = toFixed(tp.normalizedPosition().x());
            int ny = toFixed(tp.normalizedPosition().y());
            int w = toFixed(tp.ellipseDiameters().width());
            int h = toFixed(tp.ellipseDiameters().height());
            int vx = toFixed(tp.velocity().x());
            int vy = toFixed(tp.velocity().y());
            uint32_t pressure = uint32_t(tp.pressure() * 255);

            QByteArray rawData;
            send_touch(target->handle,
                       time, id, state,
                       x, y, nx, ny, w, h,
                       pressure, vx, vy,
                       flags, rawData);
        }

        return true;
    }

    return false;
}

void TouchExtensionGlobal::setBehviorFlags(BehaviorFlags flags)
{
    if (m_flags == flags)
        return;

    m_flags = flags;
    behaviorFlagsChanged();
}

void TouchExtensionGlobal::touch_extension_bind_resource(Resource *resource)
{
    m_resources.append(resource);
    send_configure(resource->handle, m_flags);
}

void TouchExtensionGlobal::touch_extension_destroy_resource(Resource *resource)
{
    m_resources.removeOne(resource);
}

}

QT_END_NAMESPACE

#include "moc_qwlqttouch_p.cpp"