import choco.kernel.solver.search.integer.AbstractIntVarSelector;
import choco.kernel.solver.variables.integer.IntDomainVar;
import choco.kernel.solver.variables.AbstractVar;
import choco.kernel.memory.IStateInt;

public class MinSaturationHeuristic extends AbstractIntVarSelector {

    private IntDomainVar[] vars;                // 0/1 decision variables
    private int n;                              // number of decision variables
    private int[] saturation;                   // saturation of vertex i
    private ReversibleSortedArray candidateSet; // the uninstantiated variables

    public MinSaturationHeuristic(IntDomainVar[] vars,int[] saturation,ReversibleSortedArray candidateSet){
	this.vars = vars; n = vars.length; this.saturation = saturation; this.candidateSet = candidateSet;
    }

    public IntDomainVar selectIntVar(){
	int minSaturation             = Integer.MAX_VALUE;
	IntDomainVar minSaturationVar = null;
	int i                         = 0;
	for (int k=0;k<candidateSet.size();k++){
	    i = candidateSet.get(k);
	    if (saturation[i] < minSaturation){minSaturationVar = vars[i]; minSaturation = saturation[i];}
	}     
	return minSaturationVar;
    }
    //
    // select the uninstantiated variable with minimum saturation
    //
}