/** \file
 * \brief The algorithm computes a planar embedding with minimum cost.
 *
 * \author Dzmitry Sledneu
 *
 * \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/graphalg/MinCostFlowModule.h>
#include <ogdf/planarity/EmbedderModule.h>

#include <memory>

namespace ogdf {
class Skeleton;
class StaticPlanarSPQRTree;

//! The algorithm computes a planar embedding with minimum cost.
/**
 * @ingroup ga-planembed
 *
 * See paper "Optimal Orthogonal Graph Drawing with Convex Bend Costs"
 * by Thomas Blasius, Ignaz Rutter, Dorothea Wagner (2012) for details.
 */
class OGDF_EXPORT EmbedderOptimalFlexDraw : public EmbedderModule {
public:
	EmbedderOptimalFlexDraw();

	virtual void doCall(Graph& G, adjEntry& adjExternal) override;

	/// Sets the module option to compute min-cost flow.
	void setMinCostFlowComputer(MinCostFlowModule<int>* pMinCostFlowComputer) {
		m_minCostFlowComputer.reset(pMinCostFlowComputer);
	}

	/// Sets bend costs for each edge.
	void cost(EdgeArray<int>* cost) { m_cost = cost; }

private:
	std::unique_ptr<MinCostFlowModule<int>> m_minCostFlowComputer;

	EdgeArray<int>* m_cost;

	void createNetwork(node parent, node mu, int bends, NodeArray<int> cost[], Skeleton& skeleton,
			EdgeArray<node>& edgeNode, Graph& N, EdgeArray<int>& upper, EdgeArray<int>& perUnitCost,
			NodeArray<int>& supply);

	void optimizeOverEmbeddings(StaticPlanarSPQRTree& T, node parent, node mu, int bends,
			NodeArray<int> cost[], NodeArray<long long> embedding[]);

	void computePrincipalSplitComponentCost(StaticPlanarSPQRTree& T, NodeArray<int> cost[],
			NodeArray<long long> embedding[], node parent, node mu);
};

}
