/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
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**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
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#include "movemanipulator.h"
#include "qdeclarativedesignview.h"
//#include "layeritem.h"

#include <QPointF>
#include <QtDebug>
#include <QColor>
#include <QPen>
#include <QApplication>

#include <limits>

namespace QmlViewer {

MoveManipulator::MoveManipulator(/*LayerItem *layerItem, */QDeclarativeDesignView *view)
    : //m_layerItem(layerItem),
    m_view(view),
    m_isActive(false)
{
}

MoveManipulator::~MoveManipulator()
{
    deleteSnapLines();
}

QPointF MoveManipulator::beginPoint() const
{
    return m_beginPoint;
}

QList<QGraphicsItem*> MoveManipulator::itemList() const
{
    return m_itemList;
}

void MoveManipulator::setItem(QGraphicsItem* item)
{
    QList<QGraphicsItem*> itemList;
    itemList.append(item);

    setItems(itemList);
}

void MoveManipulator::setItems(const QList<QGraphicsItem*> &itemList)
{
    m_itemList = itemList;

    foreach (QGraphicsItem* item, m_itemList) {
        //QPointF positionInParentSpace = m_snapper.containerQGraphicsItem()->mapFromScene(m_beginPositionInSceneSpaceHash.value(item));
        //m_beginItemRectHash[item].translate(positionInParentSpace - m_beginPositionHash.value(item));
        qDebug() << item << item->pos();
        m_beginPositionHash.insert(item, item->pos());
    }

//    if (!m_itemList.isEmpty()) {
//        if (m_itemList.first()->parentItem())
//            m_snapper.setContainerQGraphicsItem(m_itemList.first()->parentItem());
//        else
//            m_snapper.setContainerQGraphicsItem(m_itemList.first());
//        m_snapper.setTransformtionSpaceQGraphicsItem(m_snapper.containerQGraphicsItem());
//    }
}

void MoveManipulator::updateHashes()
{
//    foreach (QGraphicsItem* item, m_itemList)
//        m_beginItemRectHash[item] = item->mapRectToParent(item->qmlItemNode().instanceBoundingRect());

//    foreach (QGraphicsItem* item, m_itemList) {
//        QPointF positionInParentSpace = m_snapper.containerQGraphicsItem()->mapFromScene(m_beginPositionInSceneSpaceHash.value(item));
//        m_beginItemRectHash[item].translate(positionInParentSpace - m_beginPositionHash.value(item));
//        m_beginPositionHash.insert(item, positionInParentSpace);
//    }
}

bool MoveManipulator::itemsCanReparented() const
{
    return true;
}

void MoveManipulator::begin(const QPointF &beginPoint)
{
    m_isActive = true;

    //m_snapper.updateSnappingLines(m_itemList);


//    foreach (QGraphicsItem* item, m_itemList)
//        m_beginItemRectHash.insert(item, m_snapper.containerQGraphicsItem()->mapRectFromItem(item, item->qmlItemNode().instanceBoundingRect()));

//    foreach (QGraphicsItem* item, m_itemList) {
//        QPointF positionInParentSpace(item->qmlItemNode().instancePosition());
//        QPointF positionInScenesSpace = m_snapper.containerQGraphicsItem()->mapToScene(positionInParentSpace);
//        m_beginPositionInSceneSpaceHash.insert(item, positionInScenesSpace);
//    }

//    foreach (QGraphicsItem* item, m_itemList) {
//        QPointF positionInParentSpace = m_snapper.containerQGraphicsItem()->mapFromScene(m_beginPositionInSceneSpaceHash.value(item));
//        m_beginPositionHash.insert(item, positionInParentSpace);

//        QmlAnchors anchors(item->qmlItemNode().anchors());
//        m_beginTopMarginHash.insert(item, anchors.instanceMargin(AnchorLine::Top));
//        m_beginLeftMarginHash.insert(item, anchors.instanceMargin(AnchorLine::Left));
//        m_beginRightMarginHash.insert(item, anchors.instanceMargin(AnchorLine::Right));
//        m_beginBottomMarginHash.insert(item, anchors.instanceMargin(AnchorLine::Bottom));
//        m_beginHorizontalCenterHash.insert(item, anchors.instanceMargin(AnchorLine::HorizontalCenter));
//        m_beginVerticalCenterHash.insert(item, anchors.instanceMargin(AnchorLine::VerticalCenter));
//    }

    m_beginPoint = beginPoint;

}

//QPointF MoveManipulator::findSnappingOffset(const QList<QRectF> &boundingRectList)
//{
//    QPointF offset;

//    QMap<double, double> verticalOffsetMap;
//    foreach (const QRectF &boundingRect, boundingRectList) {
//        double verticalOffset = m_snapper.snappedVerticalOffset(boundingRect);
//        if (verticalOffset < std::numeric_limits<double>::max())
//            verticalOffsetMap.insert(qAbs(verticalOffset), verticalOffset);
//    }


//    if (!verticalOffsetMap.isEmpty())
//        offset.rx() = verticalOffsetMap.begin().value();



//    QMap<double, double> horizontalOffsetMap;
//    foreach (const QRectF &boundingRect, boundingRectList) {
//        double horizontalOffset = m_snapper.snappedHorizontalOffset(boundingRect);
//        if (horizontalOffset < std::numeric_limits<double>::max())
//            horizontalOffsetMap.insert(qAbs(horizontalOffset), horizontalOffset);
//    }


//    if (!horizontalOffsetMap.isEmpty())
//        offset.ry() = horizontalOffsetMap.begin().value();

//    return offset;
//}

//void MoveManipulator::generateSnappingLines(const QList<QRectF> &boundingRectList)
//{
//    m_graphicsLineList = m_snapper.generateSnappingLines(boundingRectList,
//                                                         m_layerItem.data(),
//                                                         m_snapper.transformtionSpaceQGraphicsItem()->sceneTransform());
//}

QList<QRectF> MoveManipulator::translatedBoundingRects(const QList<QRectF> &boundingRectList, const QPointF& offsetVector)
{
    QList<QRectF> translatedBoundingRectList;
    foreach (const QRectF &boundingRect, boundingRectList)
        translatedBoundingRectList.append(boundingRect.translated(offsetVector));

    return translatedBoundingRectList;
}



/*
  /brief updates the position of the items.
*/
void MoveManipulator::update(const QPointF& updatePoint, Snapping /*useSnapping*/, State /*stateToBeManipulated*/)
{
    //deleteSnapLines(); //Since they position is changed and the item is moved the snapping lines are
                       //are obsolete. The new updated snapping lines (color and visibility) will be
                       //calculated in snapPoint() called in moveNode() later

    if (m_itemList.isEmpty()) {
        return;
    } else {
        //QPointF updatePointInContainerSpace(m_snapper.containerQGraphicsItem()->mapFromScene(updatePoint));
        //QPointF beginPointInContainerSpace(m_snapper.containerQGraphicsItem()->mapFromScene(m_beginPoint));

        QPointF offsetVector(updatePoint - m_beginPoint);

//        if (useSnapping == UseSnapping || useSnapping == UseSnappingAndAnchoring) {
//            offsetVector -= findSnappingOffset(translatedBoundingRects(m_beginItemRectHash.values(), offsetVector));
//            //generateSnappingLines(translatedBoundingRects(m_beginItemRectHash.values(), offsetVector));
//        }

        foreach (QGraphicsItem* item, m_itemList) {
            //qDebug() << "offset:" << m_beginPositionHash.value(item) << offsetVector;
            QPointF positionInContainerSpace(m_beginPositionHash.value(item) + offsetVector);

            // don't support anchors for base state because it is not needed by the droptool
//            if (stateToBeManipulated == UseActualState) {
//                QmlAnchors anchors(item->qmlItemNode().anchors());

//                if (anchors.instanceHasAnchor(AnchorLine::Top)) {
//                    anchors.setMargin(AnchorLine::Top, m_beginTopMarginHash.value(item) + offsetVector.y());
//                }

//                if (anchors.instanceHasAnchor(AnchorLine::Left)) {
//                    anchors.setMargin(AnchorLine::Left, m_beginLeftMarginHash.value(item) + offsetVector.x());
//                }

//                if (anchors.instanceHasAnchor(AnchorLine::Bottom)) {
//                    anchors.setMargin(AnchorLine::Bottom, m_beginBottomMarginHash.value(item) - offsetVector.y());
//                }

//                if (anchors.instanceHasAnchor(AnchorLine::Right)) {
//                    anchors.setMargin(AnchorLine::Right, m_beginRightMarginHash.value(item) - offsetVector.x());
//                }

//                if (anchors.instanceHasAnchor(AnchorLine::HorizontalCenter)) {
//                    anchors.setMargin(AnchorLine::HorizontalCenter, m_beginHorizontalCenterHash.value(item) + offsetVector.x());
//                }

//                if (anchors.instanceHasAnchor(AnchorLine::VerticalCenter)) {
//                    anchors.setMargin(AnchorLine::VerticalCenter, m_beginVerticalCenterHash.value(item) + offsetVector.y());
//                }

//                item->setPos(positionInContainerSpace);
//            } else {
//                item->qmlItemNode().modelNode().variantProperty("x").setValue(qRound(positionInContainerSpace.x()));
//                item->qmlItemNode().modelNode().variantProperty("y").setValue(qRound(positionInContainerSpace.y()));
//            }
            item->setPos(positionInContainerSpace);
        }
    }
}

void MoveManipulator::clear()
{
    deleteSnapLines();
    m_beginItemRectHash.clear();
    m_beginPositionHash.clear();
    m_beginPositionInSceneSpaceHash.clear();
    m_itemList.clear();

    m_beginTopMarginHash.clear();
    m_beginLeftMarginHash.clear();
    m_beginRightMarginHash.clear();
    m_beginBottomMarginHash.clear();
    m_beginHorizontalCenterHash.clear();
    m_beginVerticalCenterHash.clear();
}

void MoveManipulator::reparentTo(QGraphicsItem *newParent)
{
    deleteSnapLines();

    if (!newParent)
        return;

    if (!itemsCanReparented())
        return;

//    foreach (QGraphicsItem* item, m_itemList) {
//        QmlItemNode parent(newParent->qmlItemNode());
//        if (parent.isValid()) {
//            item->qmlItemNode().setParentProperty(parent.nodeAbstractProperty("data"));
//        }
//    }

//    m_snapper.setContainerQGraphicsItem(newParent);
//    m_snapper.setTransformtionSpaceQGraphicsItem(m_snapper.containerQGraphicsItem());
//    m_snapper.updateSnappingLines(m_itemList);

    updateHashes();
}


void MoveManipulator::end(const QPointF &/*endPoint*/)
{
    m_isActive = false;
    deleteSnapLines();

    clear();
}

void MoveManipulator::moveBy(double deltaX, double deltaY)
{
    foreach (QGraphicsItem* item, m_itemList) {
//        QmlAnchors anchors(item->qmlItemNode().anchors());

//        if (anchors.instanceHasAnchor(AnchorLine::Top)) {
//            anchors.setMargin(AnchorLine::Top, anchors.instanceMargin(AnchorLine::Top) + deltaY);
//        }

//        if (anchors.instanceHasAnchor(AnchorLine::Left)) {
//            anchors.setMargin(AnchorLine::Left, anchors.instanceMargin(AnchorLine::Left) + deltaX);
//        }

//        if (anchors.instanceHasAnchor(AnchorLine::Bottom)) {
//            anchors.setMargin(AnchorLine::Bottom, anchors.instanceMargin(AnchorLine::Bottom) - deltaY);
//        }

//        if (anchors.instanceHasAnchor(AnchorLine::Right)) {
//            anchors.setMargin(AnchorLine::Right, anchors.instanceMargin(AnchorLine::Right) - deltaX);
//        }

//        if (anchors.instanceHasAnchor(AnchorLine::HorizontalCenter)) {
//            anchors.setMargin(AnchorLine::HorizontalCenter, anchors.instanceMargin(AnchorLine::HorizontalCenter) + deltaX);
//        }

//        if (anchors.instanceHasAnchor(AnchorLine::VerticalCenter)) {
//            anchors.setMargin(AnchorLine::VerticalCenter, anchors.instanceMargin(AnchorLine::VerticalCenter) + deltaY);
//        }

        item->moveBy(deltaX, deltaY);
    }
}

void MoveManipulator::setOpacityForAllElements(qreal opacity)
{
    foreach (QGraphicsItem* item, m_itemList)
        item->setOpacity(opacity);
}

void MoveManipulator::deleteSnapLines()
{
//    if (m_layerItem) {
//        foreach (QGraphicsItem *item, m_graphicsLineList)
//            m_layerItem->scene()->removeItem(item);
//    }
//    m_graphicsLineList.clear();
//    m_view->scene()->update();
}

bool MoveManipulator::isActive() const
{
    return m_isActive;
}

}