/*
* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, version 2.1 of the License.
* 
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, 
* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".
*
* Description:
*
*/

#include "qstmupdowngesturerecogniser.h"
#include "qstmgenericsimplegesture.h"
#include "qstmuievent_if.h"
#include "qstmutils.h"
#include "qstmfilelogger.h"

using namespace qstmGesture ;

QStm_UpdownGestureRecogniser::QStm_UpdownGestureRecogniser(QStm_GestureListenerIf* listener) : 
		                                       QStm_GestureRecogniser(listener), m_axisLock(0.5)
{
}


QStm_UpdownGestureRecogniser::~QStm_UpdownGestureRecogniser()
{
}

QStm_GestureRecognitionState QStm_UpdownGestureRecogniser::recognise(int numOfActiveStreams,
                                         QStm_GestureEngineIf* pge)
{
    QStm_GestureRecognitionState state = m_state = ENotMyGesture;
    // Check if we are enabled or not
    if (!m_gestureEnabled) return state ;

    // Look at the events to see if it looks like a tap or double tap
    if (numOfActiveStreams == 1) {
        // Then look at the event stream, it has to be tap and release
        const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
        int countOfEvents = puie->countOfEvents() ;
        qstmUiEventEngine::QStm_UiEventCode eventCode = puie->code() ;
        
        if (countOfEvents > 1) {// do we have more than one event in the stream?
            // Then look at the events to see if they are suitable for us
            // should we check that all of the events are targeted to our window?
            // currently we only check if the last one is for us and is EMove, then check if |x| > |y|
            if (puie->target() == m_powner &&
                    eventCode == qstmUiEventEngine::EMove) { // The last one is move in our window

            	if (m_loggingenabled) {
                    LOGARG("QStm_UpdownGestureRecogniser: UpDown: num %d code %d", countOfEvents, eventCode);
                }
                // Is it leftright gesture in our window?
                const QPoint& p = puie->currentXY() ;
                QPoint dp = p - puie->previousXY() ;
                // check that the Y movement is bigger
                //double dist;
                //SQRT(dist, ((qreal)(dp.x() * dp.x() + dp.y() * dp.y())));
                if ( (qAbs(dp.x()) < qAbs(dp.y())) && 
                     ((qreal)qAbs(dp.x()) / (qreal)qAbs(dp.y()) < m_axisLock) ) {
                    state = EGestureActive;
                    //qstmGesture::QStm_GenericSimpleGesture pgest(KUid, p, dp.y(), puie) ;
                    QPoint curPos(0, puie->currentXY().y());
                    QPoint prevPos(0, puie->previousXY().y());
                    qstmGesture::QStm_DirectionalGesture pgest(
                                                        KUid,
                                                        puie->currentXY(),
                                                        puie->previousXY(),
                                                        puie->timestamp(),
                                                        puie,
                                                        m_loggingenabled); 
                    
                    // Give the gesture a name
                    pgest.setName(QString("Updown")) ;
                    pgest.setTarget(puie->target());
                    // Call the listener to inform that a UpDown has occurred...
                    m_listener->gestureEnter(pgest) ;
                }
            }
        }
    }
    m_state = state;
    return state;
}

void QStm_UpdownGestureRecogniser::release(QStm_GestureEngineIf* pge)
{
	const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
    using qstmUiEventEngine::QStm_UiEventSpeed;
    const QPoint& p = puie->currentXY() ;
    QPoint dp = p - puie->previousXY() ;
    qstmGesture::QStm_GenericSimpleGesture pgest(KUid, p, puie->timestamp(), dp.y(), puie) ;
    pgest.setTarget(puie->target());
    m_listener->gestureExit(pgest) ;
    m_state = ENotMyGesture;
}