// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// FlowShopInit.h
// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
/*
    This library...

    Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
 */
//-----------------------------------------------------------------------------

#ifndef FLOWSHOPINIT_H_
#define FLOWSHOPINIT_H_

#include <eoInit.h>
#include "FlowShop.h"

/**
 * Functor
 * Initialisation of a random genotype built by the default constructor of the eoFlowShop class
 */
class FlowShopInit: public eoInit<FlowShop> {

public:

  /** 
   * constructor
   * @param const unsigned _N  the number of jobs to schedule
   */
  FlowShopInit(const unsigned _N) {
    N = _N;
  }
  
  /**
   * randomize a genotype
   * @param FlowShop & _genotype  a genotype that has been default-constructed
   */
  void operator()(FlowShop & _genotype) {
    // scheduling vector
    vector<unsigned> scheduling(N);
    // initialisation of possible values
    vector<unsigned> possibles(N);
    for(unsigned i=0 ; i<N ; i++)
      possibles[i] = i;
    // random initialization
    unsigned rInd;     // random index
    for (unsigned i=0; i<N; i++) {
      rInd = (unsigned) rng.uniform(N-i);
      scheduling[i] = possibles[rInd];
      possibles[rInd] = possibles[N-i-1];
    }
    _genotype.setScheduling(scheduling);
    _genotype.invalidate();	   // IMPORTANT in case the _genotype is old
  }


private:
  /** the number of jobs (size of a scheduling vector) */
  unsigned N;
 
};

#endif /*FLOWSHOPINIT_H_*/