/*
   mapwidget.h
   This file is part of the Project::OSiRiON world editor 
   and is distributed under the terms and conditions of 
   the GNU General Public License version 2
*/

#ifndef __INCLUDED_EDITOR_MAPWIDGET__
#define __INCLUDED_EDITOR_MAPWIDGET__

#include "entityproperties.h"

#include <QWidget>
#include <QList>

namespace editor
{

class EntityWidget;
class Manipulator;

/**
 * @brief MapWidget shows the zone map with the blue grid line
 * */
class MapWidget : public QWidget
{
	Q_OBJECT
	
public:
	MapWidget(QWidget *parent = 0);
	
	/**
	 * @brief add an entity to the map
	 * */
	EntityWidget *addEntity();
	
	void save(QTextStream &textstream);
	
	/**
	 * @brief return the currently selected entity
	 * */
	inline EntityWidget *selected() {
		return mapwidget_selected;
	}
	
	/**
	 * @return the current map zoom factor
	 * */
	float zoom() const;

protected:
	
	/**
	 * @brief handle draw events
	 * */
	virtual void paintEvent(QPaintEvent *event);
	
	/**
	 * @brief handle resize events
	 * */
	virtual void resizeEvent(QResizeEvent *event);

	/**
	 * @brief handle mouse button press events
	 * */
	virtual void mousePressEvent(QMouseEvent *event);

	/**
	 * @brief handle mouse button press events
	 * */
	virtual void mouseReleaseEvent(QMouseEvent *event);

	/**
	 * @brief handle mouse move press events
	 * */
	virtual void mouseMoveEvent(QMouseEvent *event);

	/**
	 * @brief handle mousewheel events
	 * */	
	virtual void wheelEvent(QWheelEvent *event);
	
	/**
	 * @brief handle keypress events
	 * */	
	virtual void keyPressEvent(QKeyEvent *event);

signals:
	/**
	 * @brief the selected() signal is emitted if an entity on the map is selected
	 * */
	void propertiesChanged(EntityProperties *properties);

public slots:
	/**
	 * @brief move and resize child widgets
	 * This should be called whenever a child location on the map has changed.
	 * */
	void resizeChildren();
	
	/**
	 * @brief delete selected entities
	 * */
	void deleteSelected();
	
	/**
	 * @brief duplicate selected entities
	 * */
	void duplicateSelected();
	
	/**
	 * @brief called when an entity on the map has been clicked
	 * */
	void select(EntityWidget *entity);
	
private slots:	
	/**
	 * @brief clear current selection
	 * */
	void deselect();
	
	/**
	 * @brief entity is dragged
	 * */
	void dragEntity(EntityWidget *entity, int x, int y);
	
private:
	void doBoxSelect();
	
	typedef QList<EntityWidget *> Entities;
	
	int dragstart_x;
	int dragstart_y;
	
	int dragstop_x;
	int dragstop_y;
	
	bool is_dragging;
	bool is_box_selecting;
	
	// zoom factor, as a power of 2
	int			mapwidget_zoomfactor;
	
	// center of the map, in world coordinates
	Vector3f		mapwidget_center;

	Entities		mapwidget_enties;
	EntityWidget		*mapwidget_selected;
	
	Manipulator		*mapwidget_manipulator;
};

}

#endif // __INCLUDED_EDITOR_MAPWIDGET__