/*
 * $Revision: 2523 $
 *
 * last checkin:
 *   $Author: gutwenger $
 *   $Date: 2012-07-02 20:59:27 +0200 (Mon, 02 Jul 2012) $
 ***************************************************************/

/** \file
 * \brief Declaration of base class for drawing constraints.
 *
 * \author PG478
 *
 * \par License:
 * This file is part of the Open Graph Drawing Framework (OGDF).
 *
 * \par
 * Copyright (C)<br>
 * See README.txt in the root directory of the OGDF installation 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, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * \see  http://www.gnu.org/copyleft/gpl.html
 ***************************************************************/




#ifdef _MSC_VER
#pragma once
#endif

#ifndef OGDF_CONSTRAINTS_H
#define OGDF_CONSTRAINTS_H

#include "Graph.h"
#include "String.h"


namespace ogdf {


class GraphConstraints;
struct XmlTagObject;


/* -------------------------- Constraint ----------------------------------------- */
class Constraint
{
	friend class GraphConstraints;

private:
	ListIterator<Constraint *> listIt;

protected:
	String m_Name;
	/* */
	bool m_UserDisabled;

	int m_Status; // OK, Suspended, notOk
	/* The Graph this Constraint belongs to. No Constraint without a Graph! */
	const Graph *m_pGraph;

	/* Will be called by the GraphConstraints when a Node in mGraph is removed. */
        virtual void nodeDeleted(node /*v*/) { }

public:
	Constraint(const Graph &g) : m_pGraph(&g) { m_Status = 0; m_UserDisabled = false;  }

	virtual ~Constraint() {}

	const Graph& constGraph() const { return *m_pGraph; }

	virtual bool isValid() { return (!m_UserDisabled && (m_Status==0)); }

	virtual int getInternalStatus() { return m_Status; }

	virtual void setInternalStatus(int s) { m_Status = s; }

	//virtual bool load(int stuff) = 0;
	//virtual bool save(int stuff) = 0;
	//virtual bool checkConstraints(List<Constraint*> csts) {return true; }

	void userEnable() { m_UserDisabled = false; }

	void userDisable() { m_UserDisabled = true; }

	bool isUserDisabled() { return m_UserDisabled; }

	virtual int getType() { return 0; }

	static int getStaticType() { return 0; }

	void setName(String text) { m_Name = text; }

	String getName() { return m_Name; }

	//DEBUG
	virtual bool buildFromOgml(XmlTagObject * constraintTag, Hashing <String, node> * nodes);
	virtual bool storeToOgml(int id, ostream & os, int indentStep);
	//static void generateIndent(char ** indent, const int & indentSize);

	OGDF_NEW_DELETE
};


/* -------------------------- GraphConstraints ----------------------------------------- */
/* For each Graph a Set of Constraints*/
class GraphConstraints //: public GraphStructure
{
	friend class ConstraintManager;

protected:
	/* The Graph this Constraint belongs to. No Constraint without a Graph! */
	const Graph *m_pGraph;

	/* All Constraints for mGraph */
	List<Constraint *> m_List;

public:
	/* Constructor, GraphStructure */
	GraphConstraints(const Graph &g) : m_pGraph(&g), m_List() { }

	/* Returns the Graph */
	const Graph *constGraph() { return m_pGraph; }

	/* adds a Constraint to this Set */
	void addConstraint(Constraint *c) { c->listIt = m_List.pushBack(c); }

	/* removes a Constraint from this set */
	void removeConstraint(Constraint *c) { m_List.del(c->listIt); }

	/* returns all Constraints */
	List<Constraint *> *getConstraints() { return &m_List; }

	/* Return Constraint Count */
	int numberOfConstraints() { return m_List.size(); }

	/* returns all Constraints of Type type */
	List<Constraint *> getConstraintsOfType(int type);

	template<class TYP> void getConstraintsOfType(List<TYP *> *res) {
		//List<TYP *> res;
		ListConstIterator<Constraint *> it;
		for(it = m_List.begin(); it.valid(); ++it)
		{
			Constraint *c = *it;

			if (TYP::getStaticType()==c->getType())
			{
				if (c->isValid()) res->pushBack(static_cast<TYP *>(c));
			}
		}
		//return res;
	}

	void clear() {
		m_List.clear();
	}

	virtual ~GraphConstraints() {
		ListConstIterator<Constraint *> it;
		for(it = m_List.begin(); it.valid(); ++it)
		{
			Constraint *c = *it;
			delete c;
		}
	}

	virtual void nodeDeleted(node v);
        virtual void nodeAdded(node /*v*/)    { }
        virtual void edgeDeleted(edge /*e*/)  { }
        virtual void edgeAdded(edge /*e*/)    { }
	virtual void reInit()             { }
	virtual void cleared()            { }

	OGDF_NEW_DELETE
};


/* -------------------------- ConstraintManager ----------------------------------------- */
class ConstraintManager
{
public:

	static Constraint *createConstraintByName(const Graph &G, String *name);

	static String getClassnameOfConstraint(Constraint *c);

	OGDF_NEW_DELETE
};

} // end namespace

#endif