/*
* 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 "qstmgenericsimplegesture.h"
#include "qstmflickgesturerecogniser.h"
#include "qstmuievent_if.h"
#include "qstmfilelogger.h"

using namespace qstmGesture ;

QStm_FlickGestureRecogniser::QStm_FlickGestureRecogniser(QStm_GestureListenerIf* listener) :
                              QStm_GestureRecogniser(listener)
{
}

QStm_FlickGestureRecogniser::~QStm_FlickGestureRecogniser()
{
}

/*!
 * Release gesture recogniser.  Note that this one never owns the gesture, it just calls
 * the callback if it detects ERelease inside the area being watched.
 * There could be also check for the target window?
 */
QStm_GestureRecognitionState QStm_FlickGestureRecogniser::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 flick with one pointer
    if (numOfActiveStreams == 1) {
        const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
        int countOfEvents = puie->countOfEvents();
        qstmUiEventEngine::QStm_UiEventCode eventCode = puie->code();
        if (m_loggingenabled) {
            LOGARG("QStm_FlickGestureRecogniser: %d num %d code %d", eventCode, countOfEvents, eventCode);
        }
        
        if (m_powner == puie->target() && eventCode == qstmUiEventEngine::ERelease)
        {
            if (m_loggingenabled) {
                LOGARG("QStm_FlickGestureRecogniser: 0x%x ERelease: num %d pos: [%d, %d]", 
                		this, countOfEvents, puie->currentXY().x(), puie->currentXY().y());
            }
            // Check if the speed before release was fast enough for flick
            const qstmUiEventEngine::QStm_UiEventIf* puieprev = puie->previousEvent() ;
            if (puieprev && puieprev->code() == qstmUiEventEngine::EMove) {
                using qstmUiEventEngine::QStm_UiEventSpeed;

                QPoint pos = puieprev->currentXY();
                QPoint prevPos = puieprev->previousXY();
                float thespeed = puieprev->speed() ;
                if (thespeed == 0.0f && countOfEvents > 2) {
                if (m_loggingenabled) {
                        LOGTXT("QStm_FlickGestureRecogniser: speed is 0.0. Trying to get prev speed!");
                    }
                    // trye to get speed from puie->previousEvent()->previousEvent()
                    puieprev = puieprev->previousEvent();
                    if (puieprev && puieprev->code() == qstmUiEventEngine::EMove) {
                        thespeed = puieprev->speed() ;
                    }
                }
                if (m_loggingenabled) {
                    LOGARG("QStm_FlickGestureRecogniser: prev speed: %f (limit: %f)", double(thespeed), double(m_speed)) ;
                }
                if (thespeed > m_speed) {
                    state = EGestureActive ;

                    QStm_UiEventSpeed speedIf(thespeed, puieprev->speedVec());

                    // issue the flick gesture using the TDirectionalGesture (it has the speed and direction)
                    qstmGesture::QStm_DirectionalGesture pgest(
                            KUid,
                            pos,
                            prevPos,
                            puie->timestamp(),
                            &speedIf,
                            m_loggingenabled);
                    pgest.setTarget(puie->target());

                    // Call the listener to inform that a flick has occurred...
                    m_listener->gestureEnter(pgest);
                }
            }
        }
    }
    m_state = state;
    return state;
}
void QStm_FlickGestureRecogniser::release(QStm_GestureEngineIf* /*ge*/)
{
    if (m_loggingenabled) {
        LOGARG("QStm_FlickGestureRecogniser: 0x%x flick", this);
    }
    m_state = ENotMyGesture;
}

void QStm_FlickGestureRecogniser::setFlickingSpeed(float aSpeed) /* __SOFTFP */
{
    m_speed = aSpeed ;
}