/*

* 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>

//User Includes

#include <glxmodelparm.h>

#include <glxcoverflow.h>

#include "glxviewids.h"

#define GLX_COVERFLOW_SPEED 60

#define GLX_BOUNCEBACK_SPEED 15

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),

{

//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::setCoverFlow()

{

    qDebug("GlxCoverFlow::setCoverFlow");

    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {

        mIconItem[i] = new HbIconItem(this);

        mIconItem[i]->setBrush(QBrush(Qt::black));

        mIconItem[i]->setSize(QSize(0,0));

    }

    mUiOn = FALSE;

    mBounceBackDeltaX = 10;

}

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) {

                     emit coverFlowEvent( TAP_EVENT );

                      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;

                            emit autoLeftMoveSignal();

                            break ;

                        case RIGHT_MOVE :

                            mMoveDir = NO_MOVE;

                            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::leftGesture(int value)

{

    Q_UNUSED(value);

    qDebug("GlxCoverFlow::leftGesture CurrentPos= %d value %d", mCurrentPos, value); 

    if(getSubState() == IMAGEVIEWER_S || getSubState() == FETCHER_S ) {

        return;

    }

    mMoveDir = NO_MOVE;

    mBounceBackDeltaX = ( mItemSize.width() >> 2 )  + ( mItemSize.width() >> 3 );

    emit autoLeftMoveSignal();

    if ( mUiOn == TRUE ) {

        mUiOn = FALSE;

        emit coverFlowEvent( PANNING_START_EVENT );        

    }

}

void GlxCoverFlow::rightGesture(int value)

{

    Q_UNUSED(value);

    qDebug("GlxCoverFlow::rightGesture CurrentPos= %d value %d ", mCurrentPos, value);

    if(getSubState() == IMAGEVIEWER_S || getSubState() == FETCHER_S ) {

        return;

    }

    mMoveDir = NO_MOVE;

    mBounceBackDeltaX = ( mItemSize.width() >> 2 )  + ( mItemSize.width() >> 3 );

    emit autoRightMoveSignal();

    if ( mUiOn == TRUE  ) {

        mUiOn = FALSE;

        emit coverFlowEvent( PANNING_START_EVENT );

    }     

}

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 );

            QVariant variant = mModel->data( startIndex, GlxFsImageRole );

            if ( variant.isValid() &&  variant.canConvert<HbIcon> () ) {

                mIconItem[index]->setIcon ( variant.value<HbIcon>() ) ; 

            }

            else {

                mIconItem[index]->setIcon( HbIcon() );

            }

        }

    }

}

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::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 = 10;

        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 ) {

            mSelIndex = selIndex;

            mSelItemIndex = ( ++mSelItemIndex ) % NBR_ICON_ITEM;

            selIndex = ( mSelItemIndex + 2 ) % NBR_ICON_ITEM;

            updateIconItem( mSelIndex + 2, selIndex, width * 2 ) ;

            emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;

        }

        mMoveDir = NO_MOVE;

        mBounceBackDeltaX = 10;

        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 = 10;

        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 ) {

            mSelIndex = selIndex;

            mSelItemIndex = ( mSelItemIndex == 0 ) ?  NBR_ICON_ITEM -1 : --mSelItemIndex;

            selIndex = ( mSelItemIndex + 3 ) % NBR_ICON_ITEM;

            updateIconItem( mSelIndex - 2, selIndex, - width * 2 ) ;

            emit changeSelectedIndex ( mModel->index ( mSelIndex, 0 ) ) ;

        }

        mMoveDir = NO_MOVE;

        mBounceBackDeltaX = 10;

        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;

    QVariant variant = mModel->data( mModel->index(0,0), GlxFocusIndexRole );    

    if ( variant.isValid() &&  variant.canConvert<int> () ) {

        mSelIndex = variant.value<int>();  

    }  

    qDebug("GlxCoverFlow::loadIconItems index = %d, width = %d", mSelIndex, size().width() );    

    for ( qint8 i = 0; i < NBR_ICON_ITEM ; i++ ) {

        index = calculateIndex ( mSelIndex - 2 + i) ;           

        QVariant variant = mModel->data( mModel->index(index, 0), GlxFsImageRole );

        if ( variant.isValid() &&  variant.canConvert<HbIcon> () ) {

            mIconItem[i]->setIcon ( variant.value<HbIcon>() ) ;       

        }

        else {

            mIconItem[i]->setIcon( HbIcon() );

        }            

        mIconItem[i]->setSize ( mItemSize );

        mIconItem[i]->setPos ( QPointF ( (i - 2) * mItemSize.width(), 0) );   

    }

    mSelItemIndex = 2;

    mCurrentPos = mItemSize.width() * mSelIndex;

}

void GlxCoverFlow::updateIconItem (qint16 selIndex, qint16 selItemIndex, qint16 posX)

{

    qDebug("GlxCoverFlow::updateIconItem selIndex = %d, selIconIndex = %d posX = %d", selIndex, selItemIndex, posX );

    mIconItem[selItemIndex]->setPos(QPointF(posX, 0));

    selIndex = calculateIndex( selIndex );

    QVariant variant = mModel->data( mModel->index(selIndex, 0), GlxFsImageRole );

    if ( variant.isValid() &&  variant.canConvert<HbIcon> () ) {

        mIconItem[selItemIndex]->setIcon ( variant.value<HbIcon>() ) ;       

    }

    else {

        mIconItem[selItemIndex]->setIcon( HbIcon() );

    }

    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)));

        mModel = NULL ;

    }

/*

    disconnect(mModel, SIGNAL(destroyed()), this, SLOT(_q_modelDestroyed()));

    disconnect(mModel, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)), this, SLOT(rowsAboutToBeRemoved(QModelIndex,int,int)));

*/  

}

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)));

    }   

}

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) );