/*
*
* 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 "layer.h"
namespace qmapcontrol
{
    Layer::Layer(QString layername, MapAdapter* mapadapter, enum LayerType layertype, bool takeevents)
        :visible(true), mylayername(layername), mylayertype(layertype), mapAdapter(mapadapter), takeevents(takeevents), myoffscreenViewport(QRect(0,0,0,0))
    {
       draggingGeometry = false;
        //qDebug() << "creating new Layer: " << layername << ", type: " << contents;
        //qDebug() << this->layertype;
    }

    Layer::~Layer()
    {
        delete mapAdapter;
    }

    void Layer::setSize(QSize size)
    {
        this->size = size;
        screenmiddle = QPoint(size.width()/2, size.height()/2);
        //QMatrix mat;
        //mat.translate(480/2, 640/2);
        //mat.rotate(45);
        //mat.translate(-480/2,-640/2);
        //screenmiddle = mat.map(screenmiddle);
    }

    QString Layer::layername() const
    {
        return mylayername;
    }

    const MapAdapter* Layer::mapadapter() const
    {
        return mapAdapter;
    }

    void Layer::setVisible(bool visible)
    {
        this->visible = visible;
        emit(updateRequest());
    }

    void Layer::addGeometry(Geometry* geom)
    {
        //qDebug() << geom->getName() << ", " << geom->getPoints().at(0)->getWidget();

        geometries.append(geom);
        emit(updateRequest(geom->boundingBox()));
        //a geometry can request a redraw, e.g. when its position has been changed
        connect(geom, SIGNAL(updateRequest(QRectF)),
                this, SIGNAL(updateRequest(QRectF)));
    }
    void Layer::removeGeometry(Geometry* geometry)
    {
        for (int i=0; i<geometries.count(); i++)
        {
            if (geometry == geometries.at(i))
            {
                disconnect(geometry);
                geometries.removeAt(i);
                //delete geometry;
            }
        }
    }

    void Layer::clearGeometries()
    {
        foreach(Geometry *geometry, geometries){
            disconnect(geometry);
        }
        geometries.clear();
    }

    bool Layer::isVisible() const
    {
        return visible;
    }
    void Layer::zoomIn() const
    {
        mapAdapter->zoom_in();
    }
    void Layer::zoomOut() const
    {
        mapAdapter->zoom_out();
    }

    void Layer::mouseEvent(const QMouseEvent* evnt, const QPoint mapmiddle_px)
        {
            if (takesMouseEvents())
            {
                if (evnt->button() == Qt::LeftButton && evnt->type() == QEvent::MouseButtonPress)
                {
                    // check for collision
                    QPointF c = mapAdapter->displayToCoordinate(QPoint(evnt->x()-screenmiddle.x()+mapmiddle_px.x(),
                                                                       evnt->y()-screenmiddle.y()+mapmiddle_px.y()));
                    Point* tmppoint = new Point(c.x(), c.y());
                    for (int i=0; i<geometries.count(); i++)
                    {
                        if (geometries.at(i)->isVisible() && geometries.at(i)->Touches(tmppoint, mapAdapter))

                            //if (geometries.at(i)->Touches(c, mapAdapter))
                        {

                            emit(geometryClicked(geometries.at(i), QPoint(evnt->x(), evnt->y())));
                            draggingGeometry = true;
                            geometrySelected = geometries.at(i);
                        }
                    }
                    delete tmppoint;
                }

                if (evnt->type() == QEvent::MouseButtonRelease){
                  QPointF c = mapAdapter->displayToCoordinate(QPoint(evnt->x()-screenmiddle.x()+mapmiddle_px.x(),
                                                                   evnt->y()-screenmiddle.y()+mapmiddle_px.y()));
                    draggingGeometry = false;
                    emit (geometryEndDrag(geometrySelected, c));
                    geometrySelected = 0;
                }

                if ( evnt->type() == QEvent::MouseMove && draggingGeometry){
                    QPointF c = mapAdapter->displayToCoordinate(QPoint(evnt->x()-screenmiddle.x()+mapmiddle_px.x(),
                                                                     evnt->y()-screenmiddle.y()+mapmiddle_px.y()));
                    emit(geometryDragged(geometrySelected, c));
                }
            }
        }

    bool Layer::takesMouseEvents() const
    {
        return takeevents;
    }

    void Layer::drawYourImage(QPainter* painter, const QPoint mapmiddle_px) const
    {
        if (mylayertype == MapLayer)
        {
            //qDebug() << ":: " << mapmiddle_px;
            //QMatrix mat;
            //mat.translate(480/2, 640/2);
            //mat.rotate(45);
            //mat.translate(-480/2,-640/2);

            //mapmiddle_px = mat.map(mapmiddle_px);
            //qDebug() << ":: " << mapmiddle_px;
            _draw(painter, mapmiddle_px);
        }

        drawYourGeometries(painter, QPoint(mapmiddle_px.x()-screenmiddle.x(), mapmiddle_px.y()-screenmiddle.y()), myoffscreenViewport);
    }
    void Layer::drawYourGeometries(QPainter* painter, const QPoint mapmiddle_px, QRect viewport) const
    {
        QPoint offset;
        if (mylayertype == MapLayer)
            offset = mapmiddle_px;
        else
            offset = mapmiddle_px-screenmiddle;

        painter->translate(-mapmiddle_px+screenmiddle);
        for (int i=0; i<geometries.count(); i++)
        {
            geometries.at(i)->draw(painter, mapAdapter, viewport, offset);
        }
        painter->translate(mapmiddle_px-screenmiddle);

    }
    void Layer::_draw(QPainter* painter, const QPoint mapmiddle_px) const
    {
        // screen middle rotieren...

        int tilesize = mapAdapter->tilesize();
        int cross_x = int(mapmiddle_px.x())%tilesize; // position on middle tile
        int cross_y = int(mapmiddle_px.y())%tilesize;
        //qDebug() << screenmiddle << " - " << cross_x << ", " << cross_y;

        // calculate how many surrounding tiles have to be drawn to fill the display
        int space_left = screenmiddle.x() - cross_x;
        int tiles_left = space_left/tilesize;
        if (space_left>0)
            tiles_left+=1;

        int space_above = screenmiddle.y() - cross_y;
        int tiles_above = space_above/tilesize;
        if (space_above>0)
            tiles_above+=1;

        int space_right = screenmiddle.x() - (tilesize-cross_x);
        int tiles_right = space_right/tilesize;
        if (space_right>0)
            tiles_right+=1;

        int space_bottom = screenmiddle.y() - (tilesize-cross_y);
        int tiles_bottom = space_bottom/tilesize;
        if (space_bottom>0)
            tiles_bottom+=1;

        //int tiles_displayed = 0;
        int mapmiddle_tile_x = mapmiddle_px.x()/tilesize;
        int mapmiddle_tile_y = mapmiddle_px.y()/tilesize;

	const QPoint from = QPoint((-tiles_left+mapmiddle_tile_x)*tilesize, (-tiles_above+mapmiddle_tile_y)*tilesize);
	const QPoint to = QPoint((tiles_right+mapmiddle_tile_x+1)*tilesize, (tiles_bottom+mapmiddle_tile_y+1)*tilesize);

        myoffscreenViewport = QRect(from, to);

	// for the EmptyMapAdapter no tiles should be loaded and painted.
	if (mapAdapter->host() == "")
	{
	    return;
	}

        if (mapAdapter->isValid(mapmiddle_tile_x, mapmiddle_tile_y, mapAdapter->currentZoom()))
        {
            painter->drawPixmap(-cross_x+size.width(),
                                -cross_y+size.height(),
                                ImageManager::instance()->getImage(mapAdapter->host(), mapAdapter->query(mapmiddle_tile_x, mapmiddle_tile_y, mapAdapter->currentZoom())));
        }

        for (int i=-tiles_left+mapmiddle_tile_x; i<=tiles_right+mapmiddle_tile_x; i++)
        {
            for (int j=-tiles_above+mapmiddle_tile_y; j<=tiles_bottom+mapmiddle_tile_y; j++)
            {
                // check if image is valid
                if (!(i==mapmiddle_tile_x && j==mapmiddle_tile_y))
                    if (mapAdapter->isValid(i, j, mapAdapter->currentZoom()))
                    {

                    painter->drawPixmap(((i-mapmiddle_tile_x)*tilesize)-cross_x+size.width(),
                                        ((j-mapmiddle_tile_y)*tilesize)-cross_y+size.height(),
                                        ImageManager::instance()->getImage(mapAdapter->host(), mapAdapter->query(i, j, mapAdapter->currentZoom())));
                    //if (QCoreApplication::hasPendingEvents())
                    //  QCoreApplication::processEvents();
                }
            }
        }


        // PREFETCHING
        int upper = mapmiddle_tile_y-tiles_above-1;
        int right = mapmiddle_tile_x+tiles_right+1;
        int left = mapmiddle_tile_x-tiles_right-1;
        int lower = mapmiddle_tile_y+tiles_bottom+1;

        int j = upper;
        for (int i=left; i<=right; i++)
        {
            if (mapAdapter->isValid(i, j, mapAdapter->currentZoom()))
                ImageManager::instance()->prefetchImage(mapAdapter->host(), mapAdapter->query(i, j, mapAdapter->currentZoom()));
        }
        j = lower;
        for (int i=left; i<=right; i++)
        {
            if (mapAdapter->isValid(i, j, mapAdapter->currentZoom()))
                ImageManager::instance()->prefetchImage(mapAdapter->host(), mapAdapter->query(i, j, mapAdapter->currentZoom()));
        }
        int i = left;
        for (int j=upper+1; j<=lower-1; j++)
        {
            if (mapAdapter->isValid(i, j, mapAdapter->currentZoom()))
                ImageManager::instance()->prefetchImage(mapAdapter->host(), mapAdapter->query(i, j, mapAdapter->currentZoom()));
        }
        i = right;
        for (int j=upper+1; j<=lower-1; j++)
        {
            if (mapAdapter->isValid(i, j, mapAdapter->currentZoom()))
                ImageManager::instance()->prefetchImage(mapAdapter->host(), mapAdapter->query(i, j, mapAdapter->currentZoom()));
        }
    }

    QRect Layer::offscreenViewport() const
    {
        return myoffscreenViewport;
    }

    void Layer::moveWidgets(const QPoint mapmiddle_px) const
    {
        for (int i=0; i<geometries.count(); i++)
        {
            const Geometry* geom = geometries.at(i);
            if (geom->GeometryType == "Point")
            {
                if (((Point*)geom)->widget()!=0)
                {
                    QPoint topleft_relative = QPoint(mapmiddle_px-screenmiddle);
                    ((Point*)geom)->drawWidget(mapAdapter, topleft_relative);
                }
            }
        }
    }
    Layer::LayerType Layer::layertype() const
    {
        return mylayertype;
    }

    void Layer::setMapAdapter(MapAdapter* mapadapter)
    {

        mapAdapter = mapadapter;
    }
}