/****************************************************************************
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****************************************************************************/

#include "qtoucheventsenderqpa.h"
#include <QGuiApplication>
#include <QScreen>
#include <QStringList>
#include <QDebug>

QT_BEGIN_NAMESPACE

QTouchEventSenderQPA::QTouchEventSenderQPA(const QString &spec)
{
    m_forceToActiveWindow = spec.split(QLatin1Char(':')).contains(QLatin1String("force_window"));
    m_device = new QTouchDevice;
    m_device->setType(QTouchDevice::TouchScreen);
    m_device->setCapabilities(QTouchDevice::Position | QTouchDevice::Area);
    QWindowSystemInterface::registerTouchDevice(m_device);
}

void QTouchEventSenderQPA::touch_configure(int x_min, int x_max, int y_min, int y_max,
                                           int pressure_min, int pressure_max,
                                           const QString &dev_name)
{
    hw_range_x_min = x_min;
    hw_range_x_max = x_max;
    hw_range_y_min = y_min;
    hw_range_y_max = y_max;

    hw_pressure_min = pressure_min;
    hw_pressure_max = pressure_max;

    m_device->setName(dev_name);

    if (hw_pressure_max > hw_pressure_min)
        m_device->setCapabilities(m_device->capabilities() | QTouchDevice::Pressure);
}

void QTouchEventSenderQPA::touch_point(const QList<QWindowSystemInterface::TouchPoint> &points)
{
    QRect winRect;
    if (m_forceToActiveWindow) {
        QWindow *win = QGuiApplication::activeWindow();
        if (!win)
            return;
        winRect = win->geometry();
    } else {
        winRect = QGuiApplication::primaryScreen()->geometry();
    }

    const int hw_w = hw_range_x_max - hw_range_x_min;
    const int hw_h = hw_range_y_max - hw_range_y_min;

    QList<QWindowSystemInterface::TouchPoint> touchPoints = points;
    // Map the coordinates based on the normalized position. QPA expects 'area'
    // to be in screen coordinates.
    for (int i = 0; i < touchPoints.size(); ++i) {
        QWindowSystemInterface::TouchPoint &tp(touchPoints[i]);

        // Generate a screen position that is always inside the active window
        // or the primary screen.
        const int wx = winRect.left() + int(tp.normalPosition.x() * winRect.width());
        const int wy = winRect.top() + int(tp.normalPosition.y() * winRect.height());
        const qreal sizeRatio = (winRect.width() + winRect.height()) / qreal(hw_w + hw_h);
        tp.area = QRect(0, 0, tp.area.width() * sizeRatio, tp.area.height() * sizeRatio);
        tp.area.moveCenter(QPoint(wx, wy));

        // Calculate normalized pressure.
        if (!hw_pressure_min && !hw_pressure_max)
            tp.pressure = tp.state == Qt::TouchPointReleased ? 0 : 1;
        else
            tp.pressure = (tp.pressure - hw_pressure_min) / qreal(hw_pressure_max - hw_pressure_min);
    }

    QWindowSystemInterface::handleTouchEvent(0, m_device, touchPoints);
}

QT_END_NAMESPACE