/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#include "QskEvent.h"
#include "QskGesture.h"

#include <qevent.h>

static void qskRegisterEventTypes()
{
    // We don't ask QEvent::registerEventType for unique ids as it prevents
    // using them in switch/case statements. To avoid conflicts with other
    // applications we at least try to reserve as soon as possible, so that
    // applications behaving better than us does not get them.

    for ( int i = QskEvent::NoEvent; i <= QskEvent::MaxEvent; i++ )
    {
        const int id = QEvent::registerEventType( i );
        Q_ASSERT( id == i );
    }
}

Q_CONSTRUCTOR_FUNCTION( qskRegisterEventTypes )

int qskFocusChainIncrement( const QEvent* event )
{
    if ( event && event->type() == QEvent::KeyPress )
    {
        const auto keyEvent = static_cast< const QKeyEvent* >( event );
        if ( !( keyEvent->modifiers() & ( Qt::ControlModifier | Qt::AltModifier ) ) )
        {
            switch ( keyEvent->key() )
            {
                case Qt::Key_Tab:
                    return 1;

                case Qt::Key_Backtab:
                    return -1;
            }
        }
    }

    return 0;
}

QPointF qskMousePosition( const QMouseEvent* event )
{
#if QT_VERSION >= QT_VERSION_CHECK( 6, 0, 0 )
    return event->position();
#else
    return event->localPos();
#endif
}

QPointF qskMouseScenePosition( const QMouseEvent* event )
{
#if QT_VERSION >= QT_VERSION_CHECK( 6, 0, 0 )
    return event->scenePosition();
#else
    return event->windowPos();
#endif
}

QPointF qskHoverPosition( const QHoverEvent* event )
{
#if QT_VERSION >= QT_VERSION_CHECK( 6, 0, 0 )
    return event->position();
#else
    return event->posF();
#endif
}

#ifndef QT_NO_WHEELEVENT

QPointF qskWheelPosition( const QWheelEvent* event )
{
#if QT_VERSION >= QT_VERSION_CHECK( 5, 14, 0 )
    return event->position();
#else
    return event->posF();
#endif
}

#endif

#ifndef QT_NO_WHEELEVENT

qreal qskWheelSteps( const QWheelEvent* event, int orientation )
{
    qreal delta = 0.0;

    // what about event->pixelDelta()
    auto aDelta = event->angleDelta();

#if QT_VERSION >= QT_VERSION_CHECK( 5, 7, 0 )
    if ( event->inverted() )
        aDelta.setY( -aDelta.y() );
#endif

    switch( orientation )
    {
        case Qt::Horizontal:
            delta = aDelta.x();
            break;

        case Qt::Vertical:
            delta = aDelta.y();
            break;

        default:
            delta = aDelta.y() ? aDelta.y() : aDelta.x();
    }

    return delta / QWheelEvent::DefaultDeltasPerStep; 
}

#endif

#ifndef QT_NO_WHEELEVENT

QPointF qskScrollIncrement( const QWheelEvent* event )
{
    QPointF increment = event->pixelDelta();

    if ( increment.isNull() )
    {
        increment = event->angleDelta() / QWheelEvent::DefaultDeltasPerStep;

        constexpr qreal stepSize = 20.0; // how to find this value ???
        increment *= stepSize;
    }

    return increment;
}

#endif

QskEvent::QskEvent( QskEvent::Type type )
    : QEvent( static_cast< QEvent::Type >( type ) )
{
}

#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )

QskEvent* QskEvent::clone() const
{
    return new QskEvent( *this );
}

#endif
// -- QskGeometryChangeEvent

QskGeometryChangeEvent::QskGeometryChangeEvent(
        const QRectF& rect, const QRectF& oldRect )
    : QskEvent( QskEvent::GeometryChange )
    , m_rect( rect )
    , m_oldRect( oldRect )
{
}

QskGeometryChangeEvent* QskGeometryChangeEvent::clone() const
{
    return new QskGeometryChangeEvent( *this );
}

bool QskGeometryChangeEvent::isResized() const
{
    return ( m_rect.width() != m_oldRect.width() ) ||
        ( m_rect.height() != m_oldRect.height() );
}

bool QskGeometryChangeEvent::isMoved() const
{
    return ( m_rect.x() != m_oldRect.x() ) ||
        ( m_rect.y() != m_oldRect.y() );
}

// -- QskWindowChangeEvent

QskWindowChangeEvent::QskWindowChangeEvent(
        QQuickWindow* oldWindow, QQuickWindow* window )
    : QskEvent( QskEvent::WindowChange )
    , m_oldWindow( oldWindow )
    , m_window( window )
{
}

QskWindowChangeEvent* QskWindowChangeEvent::clone() const
{
    return new QskWindowChangeEvent( *this );
}

// -- QskPopupEvent

QskPopupEvent::QskPopupEvent( Type type, QskPopup* popup )
    : QskEvent( type )
    , m_popup( popup )
{
}

QskPopupEvent* QskPopupEvent::clone() const
{
    return new QskPopupEvent( *this );
}

// -- QskGestureEvent

QskGestureEvent::QskGestureEvent( std::shared_ptr< const QskGesture > gesture )
    : QskEvent( QskEvent::Gesture )
    , m_gesture( gesture )
{
}

QskGestureEvent* QskGestureEvent::clone() const
{
    return new QskGestureEvent( *this );
}

// -- QskAnimatorEvent

QskAnimatorEvent::QskAnimatorEvent( QskAspect aspect, State state )
    : QskEvent( QskEvent::Animator )
    , m_aspect( aspect )
    , m_state( state )
{
}

QskAnimatorEvent* QskAnimatorEvent::clone() const
{
    return new QskAnimatorEvent( *this );
}