/*

* Copyright (c) 2010 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:

*

*/

#include <QGesture>

#include <QPainter>

#include <hblabel.h>

#include "hgcoverflowcontainer.h"

#include "hgmediawallrenderer.h"

#include "hgwidgetitem.h"

#include "trace.h"

static const qreal KCameraMaxYAngle(20);

static const qreal KSpringVelocityToCameraYAngleFactor(2);

static const int   KLabelMargin(4);

HgCoverflowContainer::HgCoverflowContainer(

    QGraphicsItem* parent) : HgContainer(parent),

    mTitleLabel(0),

    mDescriptionLabel(0),

    mTitlePosition(HgMediawall::PositionAboveImage),

    mDescriptionPosition(HgMediawall::PositionNone),

    mCenterIconTop(0),

    mPrevPos(-1)

{

    mTitleLabel = new HbLabel(this);

    mTitleLabel->setZValue(zValue()+1);

    mTitleLabel->setAlignment(Qt::AlignCenter);

    mTitleLabel->setVisible(false);

    mDescriptionLabel = new HbLabel(this);

    mDescriptionLabel->setZValue(zValue()+1);

    mDescriptionLabel->setAlignment(Qt::AlignCenter);

    mDescriptionLabel->setVisible(false);

}

HgCoverflowContainer::~HgCoverflowContainer()

{

}

// events

void HgCoverflowContainer::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)

{

    HgContainer::paint(painter, option, widget);

}

void HgCoverflowContainer::resizeEvent(QGraphicsSceneResizeEvent *event)

{

    FUNC_LOG;

    HbWidget::resizeEvent(event);

    QSizeF s(size());

    qreal side = qMin(s.height()/1.8, s.width()/1.8);

    INFO("Setting image size to:" << side << "," << side);

    mRenderer->setImageSize(QSizeF(side, side));

    mCenterIconTop = (s.height()-side)/2;

    positionLabels();

}

// from HgContainer

HgMediaWallRenderer* HgCoverflowContainer::createRenderer()

{

    HgMediaWallRenderer* renderer = new HgMediaWallRenderer(this);

    renderer->setImageSize(QSizeF(200, 200));

    renderer->enableCoverflowMode(true);

    renderer->setRowCount(1, renderer->getImageSize(), false);

    renderer->enableReflections(true);

    renderer->setSpacing(QSizeF(1,1));

    renderer->setFrontCoverElevationFactor(0.5);

    return renderer;

}

qreal HgCoverflowContainer::getCameraDistance(qreal springVelocity)

{

    return qAbs(springVelocity * 0.01f);

}

qreal HgCoverflowContainer::getCameraRotationY(qreal springVelocity)

{

    return qBound(-KCameraMaxYAngle, springVelocity * KSpringVelocityToCameraYAngleFactor, KCameraMaxYAngle);

}

void HgCoverflowContainer::handleTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex)

{

    Q_UNUSED(pos)

    if (qAbs(qreal(hitItemIndex) - mSpring.pos().x()) < 0.01f)

    {

        emit activated(hitItem->modelIndex());

    }

    else

    {

        mSpring.animateToPos(QPointF(hitItemIndex, 0));

    }

}

void HgCoverflowContainer::handleLongTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex)

{

    Q_UNUSED(hitItemIndex)

    emit longPressed(hitItem->modelIndex(), pos);

}

void HgCoverflowContainer::onScrollPositionChanged(qreal pos)

{

    HgContainer::onScrollPositionChanged(pos);

    if (mPrevPos != (int)pos) {

        mPrevPos = (int)pos;

        HgWidgetItem* item = itemByIndex((int)pos);

        if (item && item->modelIndex() != mSelectionModel->currentIndex()) {

            mSelectionModel->setCurrentIndex(item->modelIndex(), QItemSelectionModel::Current);

        }            

    }

}

void HgCoverflowContainer::handleCurrentChanged(const QModelIndex &current)

{

    FUNC_LOG;

    if (current.isValid()) {

        updateLabels(current.row());

    }

}

void HgCoverflowContainer::itemDataChanged(const int &firstIndex, const int &lastIndex)

{

    FUNC_LOG;

    HANDLE_ERROR_NULL(mSelectionModel); // If model has been set, also is selection model

    HgContainer::itemDataChanged(firstIndex, lastIndex);

    if (mSelectionModel->currentIndex().isValid()) {

        int current = mSelectionModel->currentIndex().row();

        if (firstIndex <= current && current <= lastIndex) {

            updateLabels(current);

        }

    }

}

void HgCoverflowContainer::setTitlePosition(HgMediawall::LabelPosition position)

{

    FUNC_LOG;

    if (mTitlePosition != position) {

        mTitlePosition = position;

        positionLabels();

    }

}

HgMediawall::LabelPosition HgCoverflowContainer::titlePosition() const

{

    FUNC_LOG;

    return mTitlePosition;

}

void HgCoverflowContainer::setDescriptionPosition(HgMediawall::LabelPosition position)

{

    FUNC_LOG;

    if (mDescriptionPosition != position) {

        mDescriptionPosition = position;

        positionLabels();

    }

}

HgMediawall::LabelPosition HgCoverflowContainer::descriptionPosition() const

{

    FUNC_LOG;

    return mDescriptionPosition;

}

void HgCoverflowContainer::setTitleFontSpec(const HbFontSpec &fontSpec)

{

    FUNC_LOG;

    if (!mTitleLabel) return;

    if (mTitleLabel->fontSpec() != fontSpec) {

        mTitleLabel->setFontSpec(fontSpec);

        positionLabels();

    }

}

HbFontSpec HgCoverflowContainer::titleFontSpec() const

{

    FUNC_LOG;

    if (!mTitleLabel) return HbFontSpec();

    return mTitleLabel->fontSpec();

}

void HgCoverflowContainer::setDescriptionFontSpec(const HbFontSpec &fontSpec)

{

    FUNC_LOG;

    if (!mDescriptionLabel) return;

    if (mDescriptionLabel->fontSpec() != fontSpec) {

        mDescriptionLabel->setFontSpec(fontSpec);

        positionLabels();

    }

}

HbFontSpec HgCoverflowContainer::descriptionFontSpec() const

{

    FUNC_LOG;

    if (!mDescriptionLabel) return HbFontSpec();

    return mDescriptionLabel->fontSpec();

}

void HgCoverflowContainer::positionLabels()

{

    FUNC_LOG;

    HANDLE_ERROR_NULL(mTitleLabel);

    HANDLE_ERROR_NULL(mDescriptionLabel);

    HANDLE_ERROR_NULL(mSelectionModel);

    int height = size().height();

    int width = size().width();

    int titleHeight = QFontMetrics(mTitleLabel->effectiveFontSpec().font()).height();

    int descriptionHeight = QFontMetrics(mDescriptionLabel->effectiveFontSpec().font()).height();

    if (mTitlePosition == HgMediawall::PositionAboveImage &&

        mDescriptionPosition == HgMediawall::PositionAboveImage) {

        mTitleLabel->setGeometry(QRectF(

            0,

            qMax(KLabelMargin, mCenterIconTop-2*KLabelMargin-titleHeight-descriptionHeight),

            width, titleHeight));

        mDescriptionLabel->setGeometry(QRectF(

            0,

            mTitleLabel->geometry().bottom()+KLabelMargin,

            width, descriptionHeight));

    }

    else if (mTitlePosition == HgMediawall::PositionBelowImage &&

             mDescriptionPosition == HgMediawall::PositionBelowImage) {

        mDescriptionLabel->setGeometry(QRectF(

            0,

            height-descriptionHeight-KLabelMargin,

            width, descriptionHeight));

        mTitleLabel->setGeometry(QRectF(

            0,

            mDescriptionLabel->geometry().top()-titleHeight-KLabelMargin,

            width, titleHeight));

    }

    else {

        if (mTitlePosition == HgMediawall::PositionAboveImage) {

            mTitleLabel->setGeometry(QRectF(

                0,

                qMax(KLabelMargin, mCenterIconTop-KLabelMargin-titleHeight),

                width, titleHeight));

        }

        else if (mTitlePosition == HgMediawall::PositionBelowImage) {

            mTitleLabel->setGeometry(QRectF(

                0,

                height-titleHeight-KLabelMargin,

                width, titleHeight));

        }

        if (mDescriptionPosition == HgMediawall::PositionAboveImage) {

            mDescriptionLabel->setGeometry(QRectF(

                0,

                qMax(KLabelMargin, mCenterIconTop-KLabelMargin-descriptionHeight),

                width, descriptionHeight));

        }

        else if (mDescriptionPosition == HgMediawall::PositionBelowImage) {

            mDescriptionLabel->setGeometry(QRectF(

                0,

                height-descriptionHeight-KLabelMargin,

                width, descriptionHeight));

        }

    }

    mTitleLabel->setVisible(mTitlePosition != HgMediawall::PositionNone);

    mDescriptionLabel->setVisible(mDescriptionPosition != HgMediawall::PositionNone);

    INFO("Title geometry:" << mTitleLabel->geometry() << "visible:" << mTitleLabel->isVisible());

    INFO("Description geometry:" << mDescriptionLabel->geometry() << "visible:" << mDescriptionLabel->isVisible());

    if (mSelectionModel->currentIndex().isValid()) {

        updateLabels(mSelectionModel->currentIndex().row());

    }

}

void HgCoverflowContainer::updateLabels(int itemIndex)

{

    FUNC_LOG;

    HANDLE_ERROR_NULL(mTitleLabel);

    HANDLE_ERROR_NULL(mDescriptionLabel);

    if (itemIndex >= 0 && itemIndex < mItems.count()) {

        mTitleLabel->setPlainText(mItems.at(itemIndex)->title());

        mDescriptionLabel->setPlainText(mItems.at(itemIndex)->description());

    }

}

void HgCoverflowContainer::scrollToPosition(const QPointF& pos, bool animate)

{

    QPointF p = pos;

    p.setX((int)pos.x());

    HgContainer::scrollToPosition(p,animate);

}