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/*

*

* This file is part of QMapControl,

* an open-source cross-platform map widget

*

* Copyright (C) 2007 - 2008 Kai Winter

*

* 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, either version 3 of the License, or

* (at your option) any later version.

*

* 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 QMapControl. If not, see <http://www.gnu.org/licenses/>.

*

* Contact e-mail: kaiwinter@gmx.de

* Program URL   : http://qmapcontrol.sourceforge.net/

*

*/

#include "layermanager.h"

namespace qmapcontrol

{

    LayerManager::LayerManager(MapControl* mapcontrol, QSize size)

        :mapcontrol(mapcontrol), scroll(QPoint(0,0)), size(size), whilenewscroll(QPoint(0,0))

    {

        // genauer berechnen?

        offSize = size *2;

        composedOffscreenImage = QPixmap(offSize);

        composedOffscreenImage2 = QPixmap(offSize);

        zoomImage = QPixmap(size);

        zoomImage.fill(Qt::white);

        screenmiddle = QPoint(size.width()/2, size.height()/2);

    }

    LayerManager::~LayerManager()

    {

        mylayers.clear();

    }

    QPointF LayerManager::currentCoordinate() const

    {

        return mapmiddle;

    }

    QPixmap LayerManager::getImage() const

    {

        return composedOffscreenImage;

    }

    Layer* LayerManager::layer() const

    {

        Q_ASSERT_X(mylayers.size()>0, "LayerManager::getLayer()", "No layers were added!");

        return mylayers.first();

    }

    Layer* LayerManager::layer(const QString& layername) const

    {

        QListIterator<Layer*> layerit(mylayers);

        while (layerit.hasNext())

        {

            Layer* l = layerit.next();

            if (l->layername() == layername)

                return l;

        }

        return 0;

    }

    QList<QString> LayerManager::layers() const

    {

        QList<QString> keys;

        QListIterator<Layer*> layerit(mylayers);

        while (layerit.hasNext())

        {

            keys.append(layerit.next()->layername());

        }

        return keys;

    }

    void LayerManager::scrollView(const QPoint& point)

    {

        scroll += point;

        zoomImageScroll+=point;

        mapmiddle_px += point;

        mapmiddle = layer()->mapadapter()->displayToCoordinate(mapmiddle_px);

        if (!checkOffscreen())

        {

            newOffscreenImage();

        }

        else

        {

            moveWidgets();

        }

    }

    void LayerManager::moveWidgets()

    {

        QListIterator<Layer*> it(mylayers);

        while (it.hasNext())

        {

            it.next()->moveWidgets(mapmiddle_px);

        }

    }

    void LayerManager::setView(const QPointF& coordinate)

    {

        mapmiddle_px = layer()->mapadapter()->coordinateToDisplay(coordinate);

        mapmiddle = coordinate;

        //TODO: muss wegen moveTo() raus

        if (!checkOffscreen())

        {

            newOffscreenImage();

        }

        else

        {

            //TODO:

            // verschiebung ausrechnen

            // oder immer neues offscreenimage

            newOffscreenImage();

        }

    }

    void LayerManager::setView(QList<QPointF> coordinates)

    {

        setMiddle(coordinates);

        // mapcontrol->update();

    }

    void LayerManager::setViewAndZoomIn(const QList<QPointF> coordinates)

    {

        while (containsAll(coordinates))

        {

            setMiddle(coordinates);

            zoomIn();

        }

        if (!containsAll(coordinates))

        {

            zoomOut();

        }

        mapcontrol->update();

    }

    void LayerManager::setMiddle(QList<QPointF> coordinates)

    {

        int sum_x = 0;

        int sum_y = 0;

        for (int i=0; i<coordinates.size(); i++)

        {

            // mitte muss in px umgerechnet werden, da aufgrund der projektion die mittebestimmung aus koordinaten ungenau ist

            QPoint p = layer()->mapadapter()->coordinateToDisplay(coordinates.at(i));

            sum_x += p.x();

            sum_y += p.y();

        }

        QPointF middle = layer()->mapadapter()->displayToCoordinate(QPoint(sum_x/coordinates.size(), sum_y/coordinates.size()));

        // middle in px rechnen!

        setView(middle);

    }

    bool LayerManager::containsAll(QList<QPointF> coordinates) const

    {

        QRectF bb = getViewport();

        bool containsall = true;

        for (int i=0; i<coordinates.size(); i++)

        {

            if (!bb.contains(coordinates.at(i)))

                return false;

        }

        return containsall;

    }

    QPoint LayerManager::getMapmiddle_px() const

    {

        return mapmiddle_px;

    }

    QRectF LayerManager::getViewport() const

    {

        QPoint upperLeft = QPoint(mapmiddle_px.x()-screenmiddle.x(), mapmiddle_px.y()+screenmiddle.y());

        QPoint lowerRight = QPoint(mapmiddle_px.x()+screenmiddle.x(), mapmiddle_px.y()-screenmiddle.y());

        QPointF ulCoord = layer()->mapadapter()->displayToCoordinate(upperLeft);

        QPointF lrCoord = layer()->mapadapter()->displayToCoordinate(lowerRight);

        QRectF coordinateBB = QRectF(ulCoord, QSizeF( (lrCoord-ulCoord).x(), (lrCoord-ulCoord).y()));

        return coordinateBB;

    }

    void LayerManager::addLayer(Layer* layer)

    {

        mylayers.append(layer);

        layer->setSize(size);

        connect(layer, SIGNAL(updateRequest(QRectF)),

                this, SLOT(updateRequest(QRectF)));

        connect(layer, SIGNAL(updateRequest()),

                this, SLOT(updateRequest()));

        if (mylayers.size()==1)

        {

            setView(QPointF(0,0));

        }

    }

    void LayerManager::newOffscreenImage(bool clearImage, bool showZoomImage)

    {

        //      qDebug() << "LayerManager::newOffscreenImage()";

        whilenewscroll = mapmiddle_px;

        if (clearImage)

        {

            composedOffscreenImage2.fill(Qt::white);

        }

        QPainter painter(&composedOffscreenImage2);

        if (showZoomImage)

        {

            painter.drawPixmap(screenmiddle.x()-zoomImageScroll.x(), screenmiddle.y()-zoomImageScroll.y(),zoomImage);

        }

        //only draw basemaps

        for (int i=0; i<mylayers.count(); i++)

        {

            Layer* l = mylayers.at(i);

            if (l->isVisible())

            {

                if (l->layertype() == Layer::MapLayer)

                {

                    l->drawYourImage(&painter, whilenewscroll);

                }

            }

        }

        composedOffscreenImage = composedOffscreenImage2;

        scroll = mapmiddle_px-whilenewscroll;

        mapcontrol->update();

    }

    void LayerManager::zoomIn()

    {

        QCoreApplication::processEvents();

        ImageManager::instance()->abortLoading();

        // layer rendern abbrechen?

        zoomImageScroll = QPoint(0,0);

        zoomImage.fill(Qt::white);

        QPixmap tmpImg = composedOffscreenImage.copy(screenmiddle.x()+scroll.x(),screenmiddle.y()+scroll.y(), size.width(), size.height());

        QPainter painter(&zoomImage);

        painter.save();

        painter.translate(screenmiddle);

        painter.scale(2, 2);

        painter.translate(-screenmiddle);

        painter.drawPixmap(0,0,tmpImg);

        painter.restore();

        QListIterator<Layer*> it(mylayers);

        //TODO: remove hack, that mapadapters wont get set zoom multiple times

        QList<const MapAdapter*> doneadapters;

        while (it.hasNext())

        {

            Layer* l = it.next();

            if (!doneadapters.contains(l->mapadapter()))

            {

                l->zoomIn();

                doneadapters.append(l->mapadapter());

            }

        }

        mapmiddle_px = layer()->mapadapter()->coordinateToDisplay(mapmiddle);

        whilenewscroll = mapmiddle_px;

        newOffscreenImage();

    }

    bool LayerManager::checkOffscreen() const

    {

        // calculate offscreenImage dimension (px)

        QPoint upperLeft = mapmiddle_px - screenmiddle;

        QPoint lowerRight = mapmiddle_px + screenmiddle;

        QRect viewport = QRect(upperLeft, lowerRight);

        QRect testRect = layer()->offscreenViewport();

        if (!testRect.contains(viewport))

        {

            return false;

        }

        return true;

    }

    void LayerManager::zoomOut()

    {

        QCoreApplication::processEvents();

        ImageManager::instance()->abortLoading();

        zoomImageScroll = QPoint(0,0);

        zoomImage.fill(Qt::white);

        QPixmap tmpImg = composedOffscreenImage.copy(screenmiddle.x()+scroll.x(),screenmiddle.y()+scroll.y(), size.width(), size.height());

        QPainter painter(&zoomImage);

        painter.translate(screenmiddle);

        painter.scale(0.5,0.5);

        painter.translate(-screenmiddle);

        painter.drawPixmap(0,0,tmpImg);

        painter.translate(screenmiddle);

        painter.scale(2,2);

        painter.translate(-screenmiddle);

        QListIterator<Layer*> it(mylayers);

        //TODO: remove hack, that mapadapters wont get set zoom multiple times

        QList<const MapAdapter*> doneadapters;

        while (it.hasNext())

        {

            Layer* l = it.next();

            if (!doneadapters.contains(l->mapadapter()))

            {

                l->zoomOut();

                doneadapters.append(l->mapadapter());

            }

        }

        mapmiddle_px = layer()->mapadapter()->coordinateToDisplay(mapmiddle);

        whilenewscroll = mapmiddle_px;

        newOffscreenImage();

    }

    void LayerManager::setZoom(int zoomlevel)

    {

        int current_zoom;

        if (layer()->mapadapter()->minZoom() < layer()->mapadapter()->maxZoom())

        {

            current_zoom = layer()->mapadapter()->currentZoom();

        }

        else

        {

            current_zoom = layer()->mapadapter()->minZoom() - layer()->mapadapter()->currentZoom();

        }

        if (zoomlevel < current_zoom)

        {

            for (int i=current_zoom; i>zoomlevel; i--)

            {

                zoomOut();

            }

        }

        else

        {

            for (int i=current_zoom; i<zoomlevel; i++)

            {

                zoomIn();

            }

        }

    }

    void LayerManager::mouseEvent(const QMouseEvent* evnt)

    {

        QListIterator<Layer*> it(mylayers);

        while (it.hasNext())

        {

            Layer* l = it.next();

            if (l->isVisible())

            {

                l->mouseEvent(evnt, mapmiddle_px);

            }

        }

    }

    void LayerManager::updateRequest(QRectF rect)

    {

        const QPoint topleft = mapmiddle_px - screenmiddle;

        QPointF c = rect.topLeft();

        if (getViewport().contains(c) || getViewport().contains(rect.bottomRight()))

        {

            // QPoint point = getLayer()->getMapAdapter()->coordinateToDisplay(c);

            // QPoint finalpoint = point-topleft;

            // QRect rect_px = QRect(int(finalpoint.x()-(rect.width()-1)/2), int(finalpoint.y()-(rect.height()-1)/2),

            //  int(rect.width()+1), int(rect.height()+1));

            //

            // mapcontrol->updateRequest(rect_px);

            mapcontrol->update();

            // newOffscreenImage();

        }

    }

    void LayerManager::updateRequest()

    {

        newOffscreenImage();

    }

    void LayerManager::forceRedraw()

    {

        newOffscreenImage();

    }

    void LayerManager::removeZoomImage()

    {

        zoomImage.fill(Qt::white);

        forceRedraw();

    }

    void LayerManager::drawGeoms(QPainter* painter)

    {

        QListIterator<Layer*> it(mylayers);

        while (it.hasNext())

        {

            Layer* l = it.next();

            if (l->layertype() == Layer::GeometryLayer && l->isVisible())

            {

                l->drawYourGeometries(painter, mapmiddle_px, layer()->offscreenViewport());

            }

        }

    }

    void LayerManager::drawImage(QPainter* painter)

    {

        painter->drawPixmap(-scroll.x()-screenmiddle.x(),

                            -scroll.y()-screenmiddle.y(),

                            composedOffscreenImage);

    }

    int LayerManager::currentZoom() const

    {

        return layer()->mapadapter()->currentZoom();

    }

    void LayerManager::resize(QSize newSize)

    {

        size = newSize;

        offSize = newSize *2;

        composedOffscreenImage = QPixmap(offSize);

        composedOffscreenImage2 = QPixmap(offSize);

        zoomImage = QPixmap(newSize);

        zoomImage.fill(Qt::white);

        screenmiddle = QPoint(newSize.width()/2, newSize.height()/2);

        QListIterator<Layer*> it(mylayers);

        while (it.hasNext())

        {

            Layer* l = it.next();

            l->setSize(newSize);

        }

        newOffscreenImage();

    }

}