/*
* <moeoQexploreWeightStrategy.h>
* Copyright (C) DOLPHIN Project-Team, INRIA Futurs, 2006-2007
* (C) OPAC Team, LIFL, 2002-2007
*
* François Legillon
*
* This software is governed by the CeCILL license under French law and
* abiding by the rules of distribution of free software.  You can  use,
* modify and/ or redistribute the software under the terms of the CeCILL
* license as circulated by CEA, CNRS and INRIA at the following URL
* "http://www.cecill.info".
*
* As a counterpart to the access to the source code and  rights to copy,
* modify and redistribute granted by the license, users are provided only
* with a limited warranty  and the software's author,  the holder of the
* economic rights,  and the successive licensors  have only  limited liability.
*
* In this respect, the user's attention is drawn to the risks associated
* with loading,  using,  modifying and/or developing or reproducing the
* software by the user in light of its specific status of free software,
* that may mean  that it is complicated to manipulate,  and  that  also
* therefore means  that it is reserved for developers  and  experienced
* professionals having in-depth computer knowledge. Users are therefore
* encouraged to load and test the software's suitability as regards their
* requirements in conditions enabling the security of their systems and/or
* data to be ensured and,  more generally, to use and operate it in the
* same conditions as regards security.
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL license and that you accept its terms.
*
* ParadisEO WebSite : http://paradiseo.gforge.inria.fr
* Contact: paradiseo-help@lists.gforge.inria.fr
*
 */
//-----------------------------------------------------------------------------

#ifndef MOEOQEXPLWEIGHTSTRAT_H_
#define MOEOQEXPLWEIGHTSTRAT_H_
#include <scalarStuffs/weighting/moeoVariableWeightStrategy.h>
#include <algorithm>
#include <utility>
#include <utils/rnd_generators.h>
//#include <rnd_generators.h>
/**
 * Change all weights according to a pattern ressembling to a "double strategy" 2 to 1 then 1 to 2.
 * Can only be applied to 2 objectives vector problem
 */
template <class MOEOT>
class moeoQexploreWeightStrategy: public moeoVariableWeightStrategy<MOEOT>
{
	public:
		/**
		 * default constructor
		 */
		moeoQexploreWeightStrategy():random(default_random),depth(0),num(0){}
		
		/**
		 * constructor with a given random generator, for algorithms wanting to keep the same generator for some reason
		 * @param _random an uniform random generator
		 */
		moeoQexploreWeightStrategy(UF_random_generator<double> &_random):random(_random),depth(0),num(0){}
		/**
		 * 
		 * @param _weights the weights to change
		 * @param moeot a moeot, not used
		 */
		void operator()(std::vector<double> &_weights,const MOEOT &moeot){
			if (depth==0){
				if (num==0){
					num++;
					_weights[0]=0;
					_weights[1]=1;
				}else{
					num=1;
					depth=1;
					_weights[0]=1;
					_weights[1]=0;
				}
			}else{
				while (num<depth && !coprim(depth,num)){
					num++;
				}
				if (num>=depth){
					depth++;
					num=1;
				}
				_weights[0]=(num+0.0)/depth;
				_weights[1]=1-(num+0.0)/depth;
				num++;
			}
		}


	private:

		bool coprim(int a, int b){
			if (b==0){
				return a==1;
			}else {
				return coprim(b,a%b);
			}
		}

		void next_num(){

		}
		UF_random_generator<double> &random;
		UF_random_generator<double> default_random;
		int depth,num,idx;
		std::list<double> toTest;
};

#endif