source: src/main/java/agents/anac/y2014/BraveCat/OfferingStrategies/BRTOfferingStrategy.java@ 126

package agents.anac.y2014.BraveCat.OfferingStrategies;

import java.util.HashMap;
import java.util.Random;

import agents.anac.y2014.BraveCat.OpponentModelStrategies.OMStrategy;
import agents.anac.y2014.BraveCat.OpponentModels.NoModel;
import agents.anac.y2014.BraveCat.OpponentModels.OpponentModel;
import agents.anac.y2014.BraveCat.necessaryClasses.BidGenerator;
import agents.anac.y2014.BraveCat.necessaryClasses.NegotiationSession;
import agents.anac.y2014.BraveCat.necessaryClasses.Schedular;
import genius.core.bidding.BidDetails;
import genius.core.utility.NonlinearUtilitySpace;

public class BRTOfferingStrategy extends OfferingStrategy {
        private BidGenerator bidGenerator;
        private Random random300;
        private BidDetails LastBestBid = null;
        private double k;
        private double Pmax;
        private double Pmin;
        private double e;// This value should be adjusted by the estimated
                                                // concession value of the opponent.

        public BRTOfferingStrategy(NegotiationSession negoSession,
                        OpponentModel model, OMStrategy oms, double e, double k) {
                random300 = new Random();
                this.e = e;// beta value.
                this.k = k;
                this.negotiationSession = negoSession;
                bidGenerator = new BidGenerator(negotiationSession);

                if (this.negotiationSession.getUtilitySpace() instanceof NonlinearUtilitySpace)
                        System.out.println("Nonlinear Utility Space!");
                this.omStrategy = oms;
                try {
                        this.Pmax = 1;
                        System.out.println("Pmax: " + this.Pmax);
                        this.Pmin = this.negotiationSession.getUtilitySpace()
                                        .getReservationValueUndiscounted();
                        System.out.println("Pmin: " + this.Pmin);
                        this.schedular = new Schedular(negotiationSession);
                } catch (Exception ex) {
                        System.out
                                        .println("Exception occured when determining Pmax and Pmin!");
                }
        }

        @Override
        public void init(NegotiationSession negoSession, OpponentModel model,
                        OMStrategy oms, HashMap<String, Double> parameters)
                        throws Exception {
                if (parameters.get("e") != null) {
                        this.negotiationSession = negoSession;

                        this.e = ((Double) parameters.get("e")).doubleValue();

                        if (parameters.get("k") != null)
                                this.k = ((Double) parameters.get("k")).doubleValue();
                        else {
                                this.k = 0.0D;
                        }
                        if (parameters.get("min") != null)
                                this.Pmin = ((Double) parameters.get("min")).doubleValue();
                        else {
                                this.Pmin = negoSession.getMinBidinDomain()
                                                .getMyUndiscountedUtil();
                        }
                        if (parameters.get("max") != null) {
                                this.Pmax = ((Double) parameters.get("max")).doubleValue();
                        } else {
                                BidDetails maxBid = negoSession.getMaxBidinDomain();
                                this.Pmax = maxBid.getMyUndiscountedUtil();
                        }

                        this.opponentModel = model;
                        this.omStrategy = oms;
                } else {
                        throw new Exception(
                                        "Constant \"e\" for the concession speed was not set.");
                }
        }

        @Override
        public BidDetails determineOpeningBid() {
                BidDetails temp = null;
                try {
                        temp = this.bidGenerator.selectBid(Pmax);
                        System.out.println("Opening Bid Utility is: "
                                        + this.negotiationSession.getUtilitySpace().getUtility(
                                                        temp.getBid()));
                } catch (Exception ex) {
                }
                return temp;
        }

        @Override
        public BidDetails determineNextBid() {
                double time = this.negotiationSession.getTime();

                this.Pmin = this.negotiationSession.getUtilitySpace()
                                .getReservationValueWithDiscount(time);

                // If this is the last bid, the agent chooses to send the best bid
                // received from the opponent, so as to avoid a break off,
                // hoping that this bid is still acceptable for the opponent, and it
                // will result in an agreement.
                if (this.schedular.FinalRounds() || this.schedular.LastRound())
                        return negotiationSession.getOpponentBidHistory()
                                        .getBestDiscountedBidDetails(
                                                        negotiationSession.getUtilitySpace());
                double targetUtility = TargetUtilityGenerator(time, this.Pmax,
                                this.Pmin, this.e, this.k);
                // System.out.println(targetUtility);
                targetUtility = TargetUtilityRandomizer(targetUtility);
                // System.out.println(targetUtility);
                try {
                        targetUtility = BehaviouralTargetUtility(targetUtility);
                } catch (Exception ex) {
                        System.out
                                        .println("Exception occured when calculating behavioral target utility!");
                }
                // System.out.println(targetUtility);
                try {
                        if (targetUtility > 1)
                                targetUtility = 1;
                } catch (Exception ex) {
                        System.out
                                        .println("Exception occured when bringing the target utility into the range!");
                }

                // System.out.println(targetUtility);

                if ((this.opponentModel instanceof NoModel))
                        this.nextBid = this.negotiationSession.getOutcomeSpace()
                                        .getBidNearUtility(targetUtility);
                else {
                        try {
                                this.nextBid = this.omStrategy.getBid(this.bidGenerator
                                                .NBidsNearUtility(targetUtility, 10));
                        } catch (Exception ex) {
                        }
                }
                return this.nextBid;
        }

        public double BehaviouralTargetUtility(double targetUtility)
                        throws Exception {
                if (LastBestBid == null) {
                        // System.out.println(this.negotiationSession.getOpponentBidHistory().size());
                        LastBestBid = this.negotiationSession.getOpponentBidHistory()
                                        .getLastBidDetails();
                        return targetUtility;
                } else {
                        if (this.negotiationSession.getUtilitySpace().getUtility(
                                        LastBestBid.getBid()) < this.negotiationSession
                                        .getUtilitySpace().getUtility(
                                                        this.negotiationSession.getOpponentBidHistory()
                                                                        .getLastBid())) {
                                double NewUtility = targetUtility
                                                - (this.negotiationSession.getUtilitySpace()
                                                                .getUtility(
                                                                                this.negotiationSession
                                                                                                .getOpponentBidHistory()
                                                                                                .getLastBid()) - this.negotiationSession
                                                                .getUtilitySpace().getUtility(
                                                                                LastBestBid.getBid()));
                                LastBestBid = this.negotiationSession.getOpponentBidHistory()
                                                .getLastBidDetails();
                                // System.out.println(NewUtility - targetUtility);
                                return NewUtility;
                        }
                }
                return targetUtility;
        }

        public double TargetUtilityRandomizer(double targetUtility) {
                Random r = new Random();
                double z = Math.abs(r.nextGaussian());
                return targetUtility
                                - ((double) ((1 - targetUtility) * z * (1 - this.negotiationSession
                                                .getTime())) / 2.58);
        }

        public double TargetUtilityGenerator(double t, double Pmax, double Pmin,
                        double e, double k) {
                double temp = Pmin + (Pmax - Pmin) * (1.0D - f(t, e, k));
                return temp;
        }

        public double f(double t, double e, double k) {
                if (e == 0.0D)
                        return k;
                double ft = k + (1.0D - k) * Math.pow(t, 1.0D / e);
                return ft;
        }

        public NegotiationSession getNegotiationSession() {
                return this.negotiationSession;
        }

        public double EstimateOpponentConcession() {
                return 1 - ((double) this.negotiationSession.getOpponentBidHistory().numberOfUniqueBidsInBidHistory / this.negotiationSession
                                .getOpponentBidHistory().numberOfTotalBidsInBidHistory);
        }

        @Override
        public String GetName() {
                return "BRTOfferingStrategy";
        }
}