/*
 *    Copyright 2012, 2013 Thomas Schöps
 *    Copyright 2014 Kai Pastor
 *
 *    This file is part of OpenOrienteering.
 *
 *    OpenOrienteering is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    OpenOrienteering 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with OpenOrienteering.  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef OPENORIENTEERING_DRAW_LINE_AND_AREA_H
#define OPENORIENTEERING_DRAW_LINE_AND_AREA_H

#include <memory>
#include <vector>

#include <QObject>
#include <QRectF>
#include <QString>

#include "tools/tool.h"

class QAction;
class QEvent;
class QPainter;
class QRectF;

namespace OpenOrienteering {

class CombinedSymbol;
class LineSymbol;
struct LineSymbolBorder;
class MapCoordF;
class MapEditorController;
class MapRenderables;
class MapWidget;
class PathObject;
class PointObject;
class PointSymbol;
class Symbol;


/**
 * Base class for drawing tools for line and area symbols.
 * Provides some common functionality, e.g. displaying the preview objects or
 * coping with changing symbols.
 */
class DrawLineAndAreaTool : public MapEditorTool
{
Q_OBJECT
public:
	DrawLineAndAreaTool(MapEditorController* editor, Type type, QAction* tool_action, bool is_helper_tool);
	~DrawLineAndAreaTool() override;
	
	void leaveEvent(QEvent* event) override;
	void finishEditing() override;
	
signals:
	void dirtyRectChanged(const QRectF& rect);
	void pathAborted();
	void pathFinished(OpenOrienteering::PathObject* path);
	
protected slots:
	virtual void setDrawingSymbol(const OpenOrienteering::Symbol* symbol);
	
protected:
	/**
	 * Creates point objects and symbols which serve as a preview for
	 * drawing the selected symbol.
	 */
	void createPreviewPoints();
	
	/** Creates preview point symbols for the given symbol. */
	void addPreviewPointSymbols(const Symbol* symbol);
	
	/** Creates preview point symbols for the border of the given line symbol. */
	void addPreviewPointSymbolsForBorder(const LineSymbol* line, const LineSymbolBorder* border);
	
	/**
	 * Sets the position of the preview objects (after cursor movements).
	 * @param map_coord The new position.
	 * @param points_index The index of the points set; there are two sets,
	 *     so the preview points can be displayed at two positions at the same time.
	 */
	void setPreviewPointsPosition(const MapCoordF& map_coord, int points_index = 0);
	
	/** Hides all preview points. */
	void hidePreviewPoints();
	
	
	/** Does necessary preparations to start drawing. */
	void startDrawing();
	
	/** Calls update() on the preview path, correctly handling its renderables. */
	virtual void updatePreviewPath();
	
	/** Aborts drawing. */
	virtual void abortDrawing();
	
	/** Finishes drawing, creating a new undo step. */
	virtual void finishDrawing();
	
	/** Finishes drawing, appending to the given object if not nullptr. */
	void finishDrawing(PathObject* append_to_object);
	
	
	/** Deletes preview all objects and points. */
	void deletePreviewObjects();
	
	/** Extends the rect to conver all preview objects. */
	void includePreviewRects(QRectF& rect);
	
	/** Draws the preview objects. */
	void drawPreviewObjects(QPainter* painter, MapWidget* widget);
	
	
	std::vector<PointSymbol*> preview_point_symbols;
	std::vector<bool> preview_point_symbols_external;
	std::vector<PointObject*> preview_points[2];
	
	std::unique_ptr<CombinedSymbol> path_combination;
	
	std::unique_ptr<MapRenderables> renderables;
	
	const Symbol* drawing_symbol = nullptr;
	PathObject* preview_path     = nullptr;
	int preview_point_radius     = 0;
	bool preview_points_shown    = false;
	bool is_helper_tool          = false;
	
};


}  // namespace OpenOrienteering
#endif
