/*
 * RmgPath.h, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */

#pragma once

#include "../GameConstants.h"
#include "../int3.h"
#include "RmgArea.h"

VCMI_LIB_NAMESPACE_BEGIN

namespace rmg
{

class Path
{
public:
	using MoveCostFunction = std::function<float(const int3 &, const int3 &)>;
	const static MoveCostFunction DEFAULT_MOVEMENT_FUNCTION;
	
	Path(const Area & area);
	Path(const Area & area, const int3 & src);
	Path(const Path & path) = default;
	Path & operator= (const Path & path);
	bool valid() const;
	
	Path search(const Tileset & dst, bool straight, std::function<float(const int3 &, const int3 &)> moveCostFunction = DEFAULT_MOVEMENT_FUNCTION) const;
	Path search(const int3 & dst, bool straight, std::function<float(const int3 &, const int3 &)> moveCostFunction = DEFAULT_MOVEMENT_FUNCTION) const;
	Path search(const Area & dst, bool straight, std::function<float(const int3 &, const int3 &)> moveCostFunction = DEFAULT_MOVEMENT_FUNCTION) const;
	Path search(const Path & dst, bool straight, std::function<float(const int3 &, const int3 &)> moveCostFunction = DEFAULT_MOVEMENT_FUNCTION) const;
	
	void connect(const Path & path);
	void connect(const int3 & path); //TODO: force connection?
	void connect(const Area & path); //TODO: force connection?
	void connect(const Tileset & path); //TODO: force connection?
	
	const Area & getPathArea() const;
	
	static Path invalid();
	static MoveCostFunction createCurvedCostFunction(const Area & border);
	static float nonEuclideanCostFunction(const int3& src, const int3& dst, const int3& center);
	
private:
	
	const Area * dArea = nullptr;
	Area dPath;
};
}

VCMI_LIB_NAMESPACE_END
