source: src/main/java/boa/components/Top3Agent/OfferingStrat_Top3.java@ 262

package boa.components.Top3Agent;


import java.util.List;
import java.util.Random;

import genius.core.Bid; 
import genius.core.bidding.BidDetails;
import genius.core.boaframework.OfferingStrategy;
import genius.core.uncertainty.UserModel;

/**
 * Offering Strategy of Top 3 Agent which
 * UNDER UNCERTAINTY: Offers one of the 3 best bids in the user model at random.
 * OTHERWISE: Offers the best bid in the domain.
 * @author Adel Magra
*/

public class OfferingStrat_Top3 extends OfferingStrategy{
        
        public BidDetails determineOpeningBid(){
                return determineNextBid();
        }
        
        /**
         * Finds the best three bid and offers one at random. If it doesn't find them, it offers a random bid.
         * @return the next bid to offer
         */
        public BidDetails determineNextBid() {  
                
                /**
                 * Uncertainty case
                 */
                UserModel userModel = negotiationSession.getUserModel();
                if (userModel != null) {
                        List<Bid> bidOrder = userModel.getBidRanking().getBidOrder();
                        
                        //In case ranking <= 3, the min bid is in top 3 and we clearly don't want to offer it.
                        //So we just offer the best bid.
                        if(bidOrder.size()<=3)
                                return new BidDetails(userModel.getBidRanking().getMaximalBid(),userModel.getBidRanking().getHighUtility());
                        
                        Bid[] best3 = {bidOrder.get(bidOrder.size()-1),bidOrder.get(bidOrder.size()-2),bidOrder.get(bidOrder.size()-3)};
                        Random generator = new Random();
                        int randomIndex = generator.nextInt(best3.length);
                        double scaleFactor = (bidOrder.size()-randomIndex)/bidOrder.size();
                        return new BidDetails(best3[randomIndex],userModel.getBidRanking().getHighUtility()*scaleFactor);
                }
                
                /**
                 * Normal utility case.
                 */
                return negotiationSession.getMaxBidinDomain();
        }
        
        public String getName() {
                return "O_S Top3";
        }
        
        
        
}