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#include <private/qmultitouch_mac_p.h>

#include <qcursor.h>

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6

QT_BEGIN_NAMESPACE

#ifdef QT_MAC_USE_COCOA

QHash<qint64, QCocoaTouch*> QCocoaTouch::_currentTouches;

QPointF QCocoaTouch::_screenReferencePos;

QPointF QCocoaTouch::_trackpadReferencePos;

int QCocoaTouch::_idAssignmentCount = 0;

int QCocoaTouch::_touchCount = 0;

bool QCocoaTouch::_updateInternalStateOnly = true;

QCocoaTouch::QCocoaTouch(NSTouch *nstouch)

{

    if (_currentTouches.size() == 0)

        _idAssignmentCount = 0;

    _touchPoint.setId(_idAssignmentCount++);

    _touchPoint.setPressure(1.0);

    _identity = qint64([nstouch identity]);

    _currentTouches.insert(_identity, this);

    updateTouchData(nstouch, NSTouchPhaseBegan);

}

QCocoaTouch::~QCocoaTouch()

{

    _currentTouches.remove(_identity);

}

void QCocoaTouch::updateTouchData(NSTouch *nstouch, NSTouchPhase phase)

{

    if (_touchCount == 1)

        _touchPoint.setState(toTouchPointState(phase) | Qt::TouchPointPrimary);

    else

        _touchPoint.setState(toTouchPointState(phase));

    // From the normalized position on the trackpad, calculate

    // where on screen the touchpoint should be according to the

    // reference position:

    NSPoint npos = [nstouch normalizedPosition];

    QPointF qnpos = QPointF(npos.x, 1 - npos.y);

    _touchPoint.setNormalizedPos(qnpos);

    if (_touchPoint.id() == 0 && phase == NSTouchPhaseBegan) {

        _trackpadReferencePos = qnpos;

        _screenReferencePos = QCursor::pos();

    }

    NSSize dsize = [nstouch deviceSize];

    float ppiX = (qnpos.x() - _trackpadReferencePos.x()) * dsize.width;

    float ppiY = (qnpos.y() - _trackpadReferencePos.y()) * dsize.height;

    QPointF relativePos = _trackpadReferencePos - QPointF(ppiX, ppiY);

    _touchPoint.setScreenPos(_screenReferencePos - relativePos);

}

QCocoaTouch *QCocoaTouch::findQCocoaTouch(NSTouch *nstouch)

{

    qint64 identity = qint64([nstouch identity]);

    if (_currentTouches.contains(identity))

        return _currentTouches.value(identity);

    return 0;

}

Qt::TouchPointState QCocoaTouch::toTouchPointState(NSTouchPhase nsState)

{

    Qt::TouchPointState qtState = Qt::TouchPointReleased;

    switch (nsState) {

        case NSTouchPhaseBegan:

            qtState = Qt::TouchPointPressed;

            break;

        case NSTouchPhaseMoved:

            qtState = Qt::TouchPointMoved;

            break;

        case NSTouchPhaseStationary:

            qtState = Qt::TouchPointStationary;

            break;

        case NSTouchPhaseEnded:

        case NSTouchPhaseCancelled:

            qtState = Qt::TouchPointReleased;

            break;

        default:

            break;

    }

    return qtState;

}

QList<QTouchEvent::TouchPoint>

QCocoaTouch::getCurrentTouchPointList(NSEvent *event, bool acceptSingleTouch)

{

    QMap<int, QTouchEvent::TouchPoint> touchPoints;

    NSSet *ended = [event touchesMatchingPhase:NSTouchPhaseEnded | NSTouchPhaseCancelled inView:nil];

    NSSet *active = [event

        touchesMatchingPhase:NSTouchPhaseBegan | NSTouchPhaseMoved | NSTouchPhaseStationary

        inView:nil];

    _touchCount = [active count];

    // First: remove touches that were ended by the user. If we are

    // currently not accepting single touches, a corresponding 'begin'

    // has never been send to the app for these events.

    // So should therefore not send the following removes either.

    for (int i=0; i<int([ended count]); ++i) {

        NSTouch *touch = [[ended allObjects] objectAtIndex:i];

        QCocoaTouch *qcocoaTouch = findQCocoaTouch(touch);

        if (qcocoaTouch) {

            qcocoaTouch->updateTouchData(touch, [touch phase]);

            if (!_updateInternalStateOnly)

                touchPoints.insert(qcocoaTouch->_touchPoint.id(), qcocoaTouch->_touchPoint);

            delete qcocoaTouch;

        }

    }

    bool wasUpdateInternalStateOnly = _updateInternalStateOnly;

    _updateInternalStateOnly = !acceptSingleTouch && _touchCount < 2;

    // Next: update, or create, existing touches.

    // We always keep track of all touch points, even

    // when not accepting single touches.

    for (int i=0; i<int([active count]); ++i) {

        NSTouch *touch = [[active allObjects] objectAtIndex:i];

        QCocoaTouch *qcocoaTouch = findQCocoaTouch(touch);

        if (!qcocoaTouch)

            qcocoaTouch = new QCocoaTouch(touch);

        else

            qcocoaTouch->updateTouchData(touch, wasUpdateInternalStateOnly ? NSTouchPhaseBegan : [touch phase]);

        if (!_updateInternalStateOnly)

            touchPoints.insert(qcocoaTouch->_touchPoint.id(), qcocoaTouch->_touchPoint);

    }

    // Next: sadly, we need to check that our touch hash is in

    // sync with cocoa. This is typically not the case after a system

    // gesture happend (like a four-finger-swipe to show expose).

    if (_touchCount != _currentTouches.size()) {

        // Remove all instances, and basically start from scratch:

        touchPoints.clear();

        foreach (QCocoaTouch *qcocoaTouch, _currentTouches.values()) {

            if (!_updateInternalStateOnly) {

                qcocoaTouch->_touchPoint.setState(Qt::TouchPointReleased);

                touchPoints.insert(qcocoaTouch->_touchPoint.id(), qcocoaTouch->_touchPoint);

            }

            delete qcocoaTouch;

        }

        _currentTouches.clear();

        _updateInternalStateOnly = !acceptSingleTouch;

        return touchPoints.values();

    }

    // Finally: If this call _started_ to reject single

    // touches, we need to fake a relase for the remaining

    // touch now (and refake a begin for it later, if needed).

    if (_updateInternalStateOnly && !wasUpdateInternalStateOnly && !_currentTouches.isEmpty()) {

        QCocoaTouch *qcocoaTouch = _currentTouches.values().first();

        qcocoaTouch->_touchPoint.setState(Qt::TouchPointReleased);

        touchPoints.insert(qcocoaTouch->_touchPoint.id(), qcocoaTouch->_touchPoint);

        // Since this last touch also will end up beeing the first

        // touch (if the user adds a second finger without lifting

        // the first), we promote it to be the primary touch:

        qcocoaTouch->_touchPoint.setId(0);

        _idAssignmentCount = 1;

    }

    return touchPoints.values();

}

#endif

QT_END_NAMESPACE

#endif // MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6