/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:   ?Description
*
*/


//Includes
#include <hbiconitem.h>
#include <QAbstractItemModel>
#include <QGraphicsSceneMouseEvent>
#include <QDebug>
#include <QGesture>
#include <hbpangesture.h>
#include <hbiconanimator.h>

//User Includes
#include <glxmodelparm.h>
#include <glxcoverflow.h>
#include "glxviewids.h"

#define GLX_COVERFLOW_SPEED  32
#define GLX_BOUNCEBACK_SPEED 16
#define GLX_BOUNCEBACK_DELTA 8

GlxCoverFlow::GlxCoverFlow(QGraphicsItem *parent ) 
     : HbWidget(parent), 
       mSelItemIndex (0),
       mRows(0),
       mSelIndex (0),
       mStripLen (0),
       mCurrentPos(0),
       mItemSize (QSize(0,0)),
       mModel ( NULL),
       mMoveDir(NO_MOVE),
       mSpeed ( GLX_COVERFLOW_SPEED ),
	   mZoomOn(false),
	   mMultitouchFilter(NULL),
       mTimerId(0)
{
//TO:DO through exception
   qDebug("GlxCoverFlow::GlxCoverFlow");
   grabGesture(Qt::PanGesture);
   grabGesture(Qt::TapGesture);
   connect( this, SIGNAL( autoLeftMoveSignal() ), this, SLOT( autoLeftMove() ), Qt::QueuedConnection );
   connect( this, SIGNAL( autoRightMoveSignal() ), this, SLOT( autoRightMove() ), Qt::QueuedConnection );   
}

void GlxCoverFlow::setMultitouchFilter(QGraphicsItem* mtFilter)
{
	mMultitouchFilter = mtFilter;
}
void GlxCoverFlow::setCoverFlow()
{
    qDebug("GlxCoverFlow::setCoverFlow");
    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {
        mIconItem[i] = new HbIconItem( this );
        mIconItem[i]->grabGesture( Qt::PinchGesture, Qt::ReceivePartialGestures );
        mIconItem[i]->installSceneEventFilter( mMultitouchFilter );
        mIconItem[i]->setBrush( QBrush( Qt::black ) );
        mIconItem[i]->setSize( QSize( 0, 0 ) );
        mIconItem[i]->setAlignment( Qt::AlignCenter );
        mIconItem[i]->setObjectName( QString( "Cover%1" ).arg( i ) );
    }
    
    mUiOn = FALSE;
    mBounceBackDeltaX = GLX_BOUNCEBACK_DELTA;
}

void GlxCoverFlow::setItemSize(QSize &size)
{
    qDebug("GlxCoverFlow::setSize width = %d",size.width() );
    if( mItemSize != size) {
        mItemSize = size;
        resetCoverFlow();
    }    
}

void GlxCoverFlow::setModel(QAbstractItemModel *model)
{
    qDebug("GlxCoverFlow::setModel model change = %d", model  );
    
    if ( model == mModel) {
        return ;
    }
    
    clearCurrentModel();
    mModel = model;
    initializeNewModel();
    resetCoverFlow();
}

void GlxCoverFlow::indexChanged( int index )
{
    qDebug("GlxCoverFlow::indexChanged index = %d mSelIndex = %d ",index, mSelIndex );
    if ( index != mSelIndex && mModel) {
        loadIconItems();
    }
}

void GlxCoverFlow::gestureEvent(QGestureEvent *event)
{    
    if(QTapGesture *gesture = static_cast<QTapGesture *>(event->gesture(Qt::TapGesture))) {        
        if (gesture->state() == Qt::GestureFinished) {
            if(!mTimerId) {
                mTimerId = startTimer(500);
            }
            else {
                killTimer(mTimerId);
                mTimerId = 0;
                emit doubleTapEventReceived(gesture->position());
            }
            event->accept(gesture);
        }
    }
  
    if (QPanGesture *panningGesture = qobject_cast<QPanGesture*>(event->gesture(Qt::PanGesture))) {
        HbPanGesture *hbPanGesture = qobject_cast<HbPanGesture *>(panningGesture);
        if (hbPanGesture) {
            if(hbPanGesture->state() == Qt::GestureUpdated) {
                QPointF delta(hbPanGesture->sceneDelta());
                panGesture(delta);
                event->accept(panningGesture);            
            }
            
            if(hbPanGesture->state() == Qt::GestureFinished) {
                switch( mMoveDir ) {
                    case LEFT_MOVE : 
                        mMoveDir = NO_MOVE;
                        mBounceBackDeltaX = ( mItemSize.width() >> 2 )  + ( mItemSize.width() >> 3 );
                        emit autoLeftMoveSignal();
                        break ;
                
                    case RIGHT_MOVE :
                        mMoveDir = NO_MOVE;
                        mBounceBackDeltaX = ( mItemSize.width() >> 2 )  + ( mItemSize.width() >> 3 );
                        emit autoRightMoveSignal();
                        break;
                
                    default:
                        break;
                } 
                event->accept(panningGesture);
            }
        }
    }  
}

void GlxCoverFlow::panGesture ( const QPointF & delta )  
{
    qDebug("GlxCoverFlow::panGesture deltaX= %d", (int)delta.x());  
    if(getSubState() == IMAGEVIEWER_S || getSubState() == FETCHER_S ) {
        return;
    }
    move((int) delta.x());    
    if( delta.x() > 0 ) {     
        mMoveDir = RIGHT_MOVE;
    }
    else if ( delta.x() < 0) {
        mMoveDir = LEFT_MOVE;
    }
    
    if ( mUiOn == TRUE  ) {
        emit coverFlowEvent( PANNING_START_EVENT );
        mUiOn = FALSE;
    }
}

void GlxCoverFlow::longPressGesture(const QPointF &point)
{
     qDebug("GlxCoverFlow::longPressGesture x = %d  y = %d", point.x(), point.y());
     mMoveDir = LONGPRESS_MOVE;
}

void GlxCoverFlow::dataChanged(QModelIndex startIndex, QModelIndex endIndex)
{
    Q_UNUSED(endIndex);
    qDebug("GlxCoverFlow::dataChanged startIndex = %d mSelIndex = %d ", startIndex.row(), mSelIndex  );
    
    int index = 0;
    for (int i = 0; i < NBR_ICON_ITEM ; i++) {
        index = calculateIndex( mSelIndex + i - 2 );
        if ( index == startIndex.row() ) {
            index = ( mSelItemIndex + i - 2 + NBR_ICON_ITEM ) % NBR_ICON_ITEM;
            qDebug("GlxCoverFlow::dataChanged index = %d mSelItemIndex = %d ", index, mSelItemIndex );
            mIconItem[ index ]->setIcon( getIcon( startIndex.row() ) );
            if ( index == mSelItemIndex ) {
                playAnimation( );
            }
        }
    }
}

void GlxCoverFlow::rowsInserted(const QModelIndex &parent, int start, int end)
{
    qDebug("GlxCoverFlow::rowsInserted");
    Q_UNUSED(parent);
    Q_UNUSED(start);
    Q_UNUSED(end);
    resetCoverFlow();  
    emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;
}

void GlxCoverFlow::rowsRemoved(const QModelIndex &parent, int start, int end)
{
    Q_UNUSED(parent);
    Q_UNUSED(start);
    Q_UNUSED(end);
    qDebug("GlxCoverFlow::rowsRemoved model %d", mModel);
    
    if ( mModel->rowCount() <= 0 ) {
        emit coverFlowEvent( EMPTY_ROW_EVENT );
    }
    else {
        resetCoverFlow();   
        emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;
    }
}

void GlxCoverFlow::modelDestroyed()
{
    mModel = NULL ;    
}

void GlxCoverFlow::autoLeftMove()
{
    int width = mItemSize.width() ;
    
    qDebug("GlxCoverFlow::autoLeftMove current pos = %d mBounceBackDeltaX x = %d", mCurrentPos, mBounceBackDeltaX);
    
    if ( mSelIndex == ( mRows -1 )) {
        mSpeed = GLX_BOUNCEBACK_SPEED;
    }
    //for bounce back effect for last image ( it will do the back)
    if ( ( mCurrentPos + width ) > ( mStripLen + mBounceBackDeltaX ) && mMoveDir == NO_MOVE ) {
        mMoveDir = LEFT_MOVE;
        mBounceBackDeltaX = GLX_BOUNCEBACK_DELTA;
        autoRightMoveSignal();
        return ;
    }
    
    int deltaX = width - mCurrentPos %  width ; 
    int moveX = deltaX > mSpeed ? mSpeed : deltaX;
    
    qDebug("GlxCoverFlow::autoLeftMove delta x = %d current pos = %d move x = %d", deltaX, mCurrentPos, moveX);
    
    move (-moveX);//move the image
    deltaX -= moveX; //To know the auto move is required or not
    
    if ( deltaX ) {
        emit autoLeftMoveSignal();
    }
    else {
        //for bounce back of first image
        if ( mMoveDir == RIGHT_MOVE ) {
            emit autoRightMoveSignal();
            return;
        }
        int selIndex = mCurrentPos / width ;
        if ( mRows == 1 || selIndex != mSelIndex ) {
            stopAnimation();
            mSelIndex = selIndex;
            mSelItemIndex = ( ++mSelItemIndex ) % NBR_ICON_ITEM;
            selIndex = ( mSelItemIndex + 2 ) % NBR_ICON_ITEM;
            updateIconItem( mSelIndex + 2, selIndex, width * 2 ) ;
            playAnimation();
			if(!mZoomOn) {
                emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;
			}
        }
        mMoveDir = NO_MOVE;
        mBounceBackDeltaX = GLX_BOUNCEBACK_DELTA;
        mSpeed = GLX_COVERFLOW_SPEED;
    }   
}

void GlxCoverFlow::autoRightMove()
{
    qDebug("GlxCoverFlow::autoRightMove ");
    int width = mItemSize.width()  ;
    int diffX = mStripLen - mCurrentPos ;
    
    //slow the speed for bounce back effect
    if ( mSelIndex == 0 ) {
        mSpeed = GLX_BOUNCEBACK_SPEED;
    }
    //for bounce back effect for back image ( it will do the back)
    qDebug("GlxCoverFlow::autoRightMove diffX x = %d current pos = %d mBounceBackDeltaX x = %d", diffX, mCurrentPos, mBounceBackDeltaX);
    if ( diffX > mBounceBackDeltaX && diffX < width && mMoveDir == NO_MOVE ){
        mMoveDir = RIGHT_MOVE;
        mBounceBackDeltaX = GLX_BOUNCEBACK_DELTA;
        autoLeftMoveSignal();  
        return ;
    }
    
    int deltaX = mCurrentPos %  width ; 
    //in the case of deltaX == 0 ( right flick case ) complete image should move
    deltaX = deltaX ? deltaX : width ; 
    int moveX = deltaX > mSpeed ? mSpeed : deltaX;
    
    qDebug("GlxCoverFlow::autoRightMove delta x = %d current pos = %d move x = %d", deltaX, mCurrentPos, moveX);
    
    move (moveX);
    deltaX -= moveX;

    if ( deltaX ) {
        emit autoRightMoveSignal();
    }
    else {
        //for bounce back of last image
        if ( mMoveDir == LEFT_MOVE ) {
            emit autoLeftMoveSignal();
            return;
        }
        int selIndex = mCurrentPos / width ;
        if ( mRows == 1 || selIndex != mSelIndex ) {
            stopAnimation();
            mSelIndex = selIndex;
            mSelItemIndex = ( mSelItemIndex == 0 ) ?  NBR_ICON_ITEM -1 : --mSelItemIndex;
            selIndex = ( mSelItemIndex + 3 ) % NBR_ICON_ITEM;
            updateIconItem( mSelIndex - 2, selIndex, - width * 2 ) ;
            playAnimation();
			if(!mZoomOn) {
                emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;
			}
        }
        mMoveDir = NO_MOVE;
        mBounceBackDeltaX = GLX_BOUNCEBACK_DELTA;
        mSpeed = GLX_COVERFLOW_SPEED;
    }
}

void GlxCoverFlow::move(int value)
{
    qDebug("GlxCoverFlow::move ");
    QPointF pos(0,0);

    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {
        pos.setX( mIconItem[i]->pos().x() + value);
        pos.setY(mIconItem[i]->pos().y());
        mIconItem[i]->setPos(pos);
    }
    
    mCurrentPos -= value;
    if ( mCurrentPos < 0 ) {
        mCurrentPos += mStripLen;
    }
    else if ( mCurrentPos >= mStripLen ) {
        mCurrentPos -= mStripLen;
    }
    qDebug("GlxCoverFlow::Move value = %d current pos = %d", value, mCurrentPos); 
}

void GlxCoverFlow::setRows()
{
    qDebug("GlxCoverFlow::setRows ");
    if (mModel) {
        mRows = mModel->rowCount();
    }
    else {
        mRows = 0;
    }
    qDebug("GlxCoverFlow::setRows number of rows = %d", mRows);
}

void GlxCoverFlow::setStripLen()
{  
    qDebug("GlxCoverFlow::setStripLen ");
    mStripLen = mRows * mItemSize.width();  
    qDebug("GlxCoverFlow::setStripLen rows = %d, striplen %d", mRows, mStripLen);
}

int GlxCoverFlow::calculateIndex(int index)
{
    qDebug("GlxCoverFlow::calculateIndex index = %d, mRows = %d", index, mRows);
    
    if ( mRows == 1 )
        return 0;
    
    if ( index < 0 ) 
        return ( index + mRows );
   
    if ( index >= mRows ) 
        return ( index - mRows ) ;
    
    return index;        
}

void GlxCoverFlow::loadIconItems()
{  
    qDebug("GlxCoverFlow::loadIconItems ");
    int index = 0;
    stopAnimation();
    mSelIndex = getFocusIndex();
    
    qDebug("GlxCoverFlow::loadIconItems index = %d, width = %d", mSelIndex, size().width() );    
    
    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {
        index = calculateIndex ( mSelIndex - 2 + i) ; 
        mIconItem[i]->setIcon( getIcon( index ) );
        mIconItem[i]->setSize ( mItemSize );
        mIconItem[i]->setPos ( QPointF ( (i - 2) * mItemSize.width(), 0) );   
    }
    
    mSelItemIndex = 2;
    mCurrentPos = mItemSize.width() * mSelIndex;
    playAnimation();
}

void GlxCoverFlow::playAnimation()
{
    if ( isAnimatedImage( mSelIndex ) ) {
        mIconItem[ mSelItemIndex ]->setIcon( HbIcon( getUri( mSelIndex ) ) );
        mIconItem[ mSelItemIndex ]->animator().startAnimation();
    }
}

void GlxCoverFlow::stopAnimation()
{
    mIconItem[ mSelItemIndex ]->animator().stopAnimation();
}

void GlxCoverFlow::updateIconItem (qint16 selIndex, qint16 selItemIndex, qint16 posX)
{
    qDebug("GlxCoverFlow::updateIconItem selIndex = %d, selIconIndex = %d posX = %d", selIndex, selItemIndex, posX );
    
    selIndex = calculateIndex( selIndex );
    mIconItem[ selItemIndex ]->setPos( QPointF( posX, 0 ) );    
    mIconItem[ selItemIndex ]->setIcon( getIcon( selIndex ) );
    mIconItem[ selItemIndex ]->setSize ( mItemSize );    
}

void GlxCoverFlow::clearCurrentModel()
{
    qDebug("GlxCoverFlow::clearCurrentModel ");
    if ( mModel ) {
        disconnect( mModel, SIGNAL( dataChanged( QModelIndex, QModelIndex ) ), this, SLOT( dataChanged( QModelIndex, QModelIndex ) ) );
        disconnect( mModel, SIGNAL( rowsInserted( QModelIndex, int, int ) ), this, SLOT( rowsInserted( QModelIndex, int, int ) ) );
        disconnect( mModel, SIGNAL( rowsRemoved( QModelIndex, int, int) ), this, SLOT( rowsRemoved( QModelIndex, int, int ) ) );
        disconnect( mModel, SIGNAL( destroyed() ), this, SLOT( modelDestroyed() ) );
        mModel = NULL ;
    } 
}

void GlxCoverFlow::initializeNewModel()
{
    qDebug("GlxCoverFlow::initializeNewModel" );
    if ( mModel ) {
        connect( mModel, SIGNAL( dataChanged( QModelIndex, QModelIndex ) ), this, SLOT( dataChanged( QModelIndex, QModelIndex ) ) );
        connect( mModel, SIGNAL( rowsInserted( QModelIndex, int, int ) ), this, SLOT( rowsInserted( QModelIndex, int, int ) ) );
        connect( mModel, SIGNAL( rowsRemoved( QModelIndex, int, int) ), this, SLOT( rowsRemoved( QModelIndex, int, int ) ) );
        connect( mModel, SIGNAL( destroyed() ), this, SLOT( modelDestroyed() ) );
    } 
}

void GlxCoverFlow::resetCoverFlow()
{
    qDebug("GlxCoverFlow::resetCoverFlow model %u", mModel );
    setRows();
    setStripLen();
    if ( mModel ) {
        loadIconItems( ) ;  
    }
}

void GlxCoverFlow::partiallyClean()
{
    qDebug("GlxCoverFlow::partiallyClean Enter");
    clearCurrentModel(); //during the animation data update will not cause the crash
    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {
        if ( mSelItemIndex != i){
            delete mIconItem[i] ;
            mIconItem[i] = NULL;
        }
    }      
}

void GlxCoverFlow::partiallyCreate(QAbstractItemModel *model, QSize itemSize)
{
    qDebug("GlxCoverFlow::resetpartiallyCreated");
    mIconItem[2]->setSize ( itemSize );
    mIconItem[2]->setPos ( QPointF ( 0, 0) ); 
    mModel = model ; 
    mSelIndex = getFocusIndex();
    mIconItem[2]->setIcon( getIcon( mSelIndex ) ) ;
    mModel = NULL;
}

GlxCoverFlow::~GlxCoverFlow()
{
    qDebug("GlxCoverFlow::~GlxCoverFlow model " );
    ClearCoverFlow();
    disconnect( this, SIGNAL( autoLeftMoveSignal() ), this, SLOT( autoLeftMove() ) );
    disconnect( this, SIGNAL( autoRightMoveSignal() ), this, SLOT( autoRightMove() ) );
}

void GlxCoverFlow::ClearCoverFlow()
{
    qDebug("GlxCoverFlow::ClearCoverFlow  " );
    clearCurrentModel();    
    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {
        if(mIconItem[i] != NULL ) {
            delete mIconItem[i] ;
            mIconItem[i] = NULL;
        }
    }   
}

int GlxCoverFlow::getSubState()
{
    int substate = NO_FULLSCREEN_S;
    QVariant variant = mModel->data( mModel->index(0,0), GlxSubStateRole );    
    if ( variant.isValid() &&  variant.canConvert<int> ()  ) {
        substate = variant.value<int>();
    }
    return substate;
}

void GlxCoverFlow::zoomStarted(int index)
{
    Q_UNUSED(index)
    stopAnimation();
	mZoomOn = true;	
}

void GlxCoverFlow::zoomFinished(int index)
{ 
	mZoomOn = false;
	playAnimation();
	indexChanged(index);
}

void GlxCoverFlow::timerEvent(QTimerEvent *event)
{
    if(mTimerId == event->timerId())
    {
        killTimer(mTimerId);
        mTimerId = 0;
        emit coverFlowEvent( TAP_EVENT );
    }
}

int GlxCoverFlow::getFocusIndex( )
{
    QVariant variant = mModel->data( mModel->index( 0, 0 ), GlxFocusIndexRole ) ;
    if ( variant.isValid() && variant.canConvert< int > () ) {
        return variant.value< int > ();
    }
    return -1;
}

HbIcon GlxCoverFlow::getIcon( int index )
{
    QVariant variant = mModel->data( mModel->index( index, 0 ), GlxFsImageRole );
    if ( variant.isValid() &&  variant.canConvert< HbIcon > () ) {
        return variant.value<HbIcon> () ;       
    }
    return HbIcon() ;
}

QString GlxCoverFlow::getUri( int index )
{
    QVariant variant = mModel->data( mModel->index( index, 0 ), GlxUriRole );
    if ( variant.isValid() && variant.canConvert< QString > () ){
        return variant.value< QString > () ;
    }
    return QString();
}

bool GlxCoverFlow::isAnimatedImage( int index )
{
    int frameCount = 0;
    QVariant variant = mModel->data( mModel->index( index, 0 ), GlxFrameCount );
    if ( variant.isValid() && variant.canConvert< int > () ) {
         frameCount = variant.value< int > () ;
    }
    return frameCount > 1 ? true : false ;
}