/** \file
 * \brief Merges nodes with solar system rules.
 *
 * \author Gereon Bartel
 *
 * \par License:
 * This file is part of the Open Graph Drawing Framework (OGDF).
 *
 * \par
 * Copyright (C)<br>
 * See README.md in the OGDF root directory for details.
 *
 * \par
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * Version 2 or 3 as published by the Free Software Foundation;
 * see the file LICENSE.txt included in the packaging of this file
 * for details.
 *
 * \par
 * 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 General Public License for more details.
 *
 * \par
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, see
 * http://www.gnu.org/copyleft/gpl.html
 */

#pragma once

#include <ogdf/basic/Graph.h>
#include <ogdf/basic/basic.h>
#include <ogdf/energybased/multilevel_mixer/MultilevelBuilder.h>

#include <map>
#include <vector>

namespace ogdf {
class MultilevelGraph;

//! The solar merger for multilevel layout.
/**
 * @ingroup gd-multi
 */
class OGDF_EXPORT SolarMerger : public MultilevelBuilder {
	struct PathData {
		explicit PathData(int targetSunParam = 0, double len = 0.0f, int num = 0)
			: targetSun(targetSunParam), length(len), number(num) { }

		int targetSun;
		double length;
		int number;
	};

	bool m_sunSelectionSimple;
	bool m_massAsNodeRadius;
	NodeArray<unsigned int> m_mass;
	NodeArray<double> m_radius;
	NodeArray<int> m_celestial; // 0 = unknown, 1 = sun, 2 = planet, 3 = moon
	NodeArray<node> m_orbitalCenter;
	NodeArray<double> m_distanceToOrbit;
	NodeArray<std::vector<PathData>> m_pathDistances;
	std::map<int, std::map<int, PathData>> m_interSystemPaths;

	node sunOf(node object);
	double distanceToSun(node object, MultilevelGraph& MLG);
	void addPath(node sourceSun, node targetSun, double distance);
	void findInterSystemPaths(Graph& G, MultilevelGraph& MLG);
	int calcSystemMass(node v);
	bool collapseSolarSystem(MultilevelGraph& MLG, node sun, int level);
	bool buildOneLevel(MultilevelGraph& MLG) override;
	std::vector<node> selectSuns(MultilevelGraph& MLG);

public:
	explicit SolarMerger(bool simple = false, bool massAsNodeRadius = false);

	void buildAllLevels(MultilevelGraph& MLG) override;
};

}
