source: src/main/java/bargainingchips/utilityfunctions/UF_LessPriceCloseToQuantity.java@ 341

/**
 * 
 */
package bargainingchips.utilityfunctions;

import bargainingchips.Bundle;
import bargainingchips.BundleBuilder;
import bargainingchips.Chip;
import bargainingchips.ChipIssueValue;
import bargainingchips.ChipIssueValueBuilder;
import bargainingchips.wishlist.WishList;
import bargainingchips.wishlist.WishListBuilder;

/**
 * 
 * This utility function evaluates the utility of an offer based on its separate utilities regarding the ratio of its total price {@link UF_LessPrice}
 * with respect to the break even prices as well as the total deviation of the chips quantities {@link UF_CloseToQuantity} by considering the importance of price vs. quantity.
 * It calculates two separate utility functions uP for total offered vs. desired prices as well as uQ for total offered vs desired quantities.
 * The utility of the offered bundle is then is calculated by uP * uQ (dependent values).
 * 
 * 
 * @author Faria Nassiri-Mofakham
 *
 */
public class UF_LessPriceCloseToQuantity implements UtilityFunction {

        private WishList wishlist;
        private ChipIssueValue<Double> breakEvenPrices;


        public UF_LessPriceCloseToQuantity(WishList w, ChipIssueValue<Double> bEP)
        {
                this.wishlist = w;
                this.breakEvenPrices = bEP;     
        }


        @Override
        public Double getUtility(Bundle b) 
        {
                int totalDeviationQ = 0;
                double desiredP=0.0;
                for (Chip c : wishlist)
                {
                        int desiredQ = wishlist.getQuantity(c);
                        Integer offeredQ = b.getQuantity(c);
                        if (offeredQ == null)
                                offeredQ = 0;

                        int deviationOfferedQ = Math.abs(desiredQ - offeredQ);
                        totalDeviationQ += deviationOfferedQ;

                        desiredP += ((c!=null) ? breakEvenPrices.getUnitValue(c) : 0.0);
                }
                double offeredP = ((b!=null) ? b.getTotalPrice() : 0.0);
                if (offeredP > desiredP)
                {
                        //System.out.println("offeredPrice "+ offeredP + " > desiredPrice "+ desiredP);
                        return 0.0;
                }
                double uP = 1.0 - offeredP/desiredP;
                double uQ = 1.0 / (1 + totalDeviationQ);

                //System.out.println("uP "+uP+"\n"+"uQ "+uQ);
                
                double u = uP * uQ; 
                return ( Double.isNaN(u)? 0.0 : ( (u>1) ? 1 : ( u < 0) ? 0 : u));
        }

        @Override
        public String toString()
        {
                return this.getClass().getSimpleName() + ": WishList " + wishlist.toString() + ": BreakEvenPrices "+ breakEvenPrices.toString();
        }

        public static void main(String[] args) 
        {

                WishList wishlist1 = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
                ChipIssueValue<Double> prices1 = new ChipIssueValueBuilder<Double>().addIssue("Red", 100.0).addIssue("Green", 200.0).addIssue("Blue", 700.0).build();

                UF_LessPriceCloseToQuantity u1 = new UF_LessPriceCloseToQuantity(wishlist1, prices1);



                WishList wishlist2 = new WishListBuilder().addWish("Red", 7).addWish("Green", 5).build();
                ChipIssueValue<Double> prices2 = new ChipIssueValueBuilder<Double>().addIssue("Red", 10.0).addIssue("Green", 20.0).addIssue("Blue", 70.0).build();

                UF_LessPriceCloseToQuantity u2 = new UF_LessPriceCloseToQuantity(wishlist2, prices2);



                WishList wishlist3 = new WishListBuilder().addWish("Green", 4).addWish("Yellow", 6).addWish("Orange", 40).build();
                ChipIssueValue<Double> prices3 = new ChipIssueValueBuilder<Double>().addIssue("Green", 3.0).addIssue("Yellow", 5.0).addIssue("Orange", 1.0).build();

                UF_LessPriceCloseToQuantity u3 = new UF_LessPriceCloseToQuantity(wishlist3, prices3);



                Bundle offer1 = new BundleBuilder()
                                .addStack("Red", 1.0, 6)
                                .addStack("Green", 3.0, 15)
                                .addStack("Purple", 0.10, 10)
                                .build();

                Bundle offer2 = new BundleBuilder()
                                .addStack("Red", 1.0, 1)
                                .addStack("Green", 3.0, 1)
                                .addStack("Purple", 0.10, 1)                    
                                .build();       

                Bundle offer3 = new BundleBuilder()             
                                //                              .addStack("Green", 2.0, 3)
                                //                              .addStack("Yellow", 5.0, 4)
                                //                              .addStack("Orange", 1.0, 17)
                                //---                           
                                .addStack("Green", 3.0, 4)              
                                .addStack("Yellow", 5.0, 6)
                                .addStack("Orange", 1.0, 40)
                                //---                           
                                //                              .addStack("Green", 10.0, 1)             
                                //                              .addStack("Yellow", 10.0, 1)
                                //                              .addStack("Orange", 10.0, 1)
                                .build();

                System.out.println("\nu1 : "+u1 +"\nOffer1 = "+offer1);
                System.out.println("=> "+u1.getUtility(offer1));        
                System.out.println("\nu1 : "+u1 +"\nOffer2 = "+offer2);
                System.out.println("=> "+u1.getUtility(offer2));
                System.out.println("\nu1 : "+u1 +"\nOffer3 = "+offer3);
                System.out.println("=> "+u1.getUtility(offer3));

                System.out.println("\nu2 : "+u2 +"\nOffer1 = "+offer1);
                System.out.println("=> "+u2.getUtility(offer1));
                System.out.println("\nu2 : "+u2 +"\nOffer2 = "+offer2);
                System.out.println("=> "+u2.getUtility(offer2));
                System.out.println("\nu2 : "+u2 +"\nOffer3 = "+offer3);
                System.out.println("=> "+u2.getUtility(offer3));


                System.out.println("\nu3 : "+u3 +"\nOffer1 = "+offer1);
                System.out.println("=> "+u3.getUtility(offer1));
                System.out.println("\nu3 : "+u3 +"\nOffer2 = "+offer2);
                System.out.println("=> "+u3.getUtility(offer2));
                System.out.println("\nu3 : "+u3 +"\nOffer3 = "+offer3);
                System.out.println("=> "+u3.getUtility(offer3));        
                

        }

}