source: src/main/java/agents/anac/y2019/harddealer/HardDealer_BS.java@ 201

package agents.anac.y2019.harddealer;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import genius.core.bidding.BidDetails;
import genius.core.boaframework.BOAparameter;
import genius.core.boaframework.NegotiationSession;
import genius.core.boaframework.NoModel;
import genius.core.boaframework.OMStrategy;
import genius.core.boaframework.OfferingStrategy;
import genius.core.boaframework.OpponentModel;
import genius.core.boaframework.SortedOutcomeSpace;
import genius.core.timeline.Timeline;

/**
 * We have used the TimedependentAgent class to implement our bidding strategy.
 * Below are the original creators, the code is edited by Sven Hendrikx.
 */
/**
 * This is an abstract class used to implement a TimeDependentAgent Strategy
 * adapted from [1] [1] S. Shaheen Fatima Michael Wooldridge Nicholas R.
 * Jennings Optimal Negotiation Strategies for Agents with Incomplete
 * Information http://eprints.ecs.soton.ac.uk/6151/1/atal01.pdf
 *
 * The default strategy was extended to enable the usage of opponent models.
 */
public class HardDealer_BS extends OfferingStrategy {

        /**
         * k in [0, 1]. For k = 0 the agent starts with a bid of maximum utility
         */
        private double reservationValue;
        private double k;
        /** Maximum target utility */
        private double Pmax;
        /** Minimum target utility */
        private double Pmin;
        /** Concession factor */
        private double e;
        /** Outcome space */
        private SortedOutcomeSpace outcomespace;
        /**
         * Method which initializes the agent by setting all parameters. The
         * parameter "e" is the only parameter which is required.
         */
        @Override
        public void init(NegotiationSession negoSession, OpponentModel model, OMStrategy oms,
                        Map<String, Double> parameters) throws Exception {
                super.init(negoSession, parameters);
                if (parameters.get("e") != null) {
                        this.negotiationSession = negoSession;

                        outcomespace = new SortedOutcomeSpace(negotiationSession.getUtilitySpace());

                        negotiationSession.setOutcomeSpace(outcomespace);
                        
                        // We initialize "e" as a function of the negotiation length since different lengths require different concession rates.
                        // This will be overwritten if the the timeline is of type Time
                        // for more info see report section on bidding strategy
                        this.e = (1.8) / negotiationSession.getTimeline().getTotalTime();
                        this.reservationValue = negotiationSession.getUtilitySpace().getReservationValue();
                        
                        if (parameters.get("k") != null)
                                this.k = parameters.get("k");
                        else
                                this.k = 0;

                        if (parameters.get("min") != null)
                                this.Pmin = parameters.get("min");
                        else
                                this.Pmin = negoSession.getMinBidinDomain().getMyUndiscountedUtil();

                        if (parameters.get("max") != null) {
                                Pmax = parameters.get("max");
                        } else {
                                BidDetails maxBid = negoSession.getMaxBidinDomain();
                                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() {
                return determineNextBid();
        }

        /**
         * Simple offering strategy which retrieves the target utility and looks for
         * the nearest bid if no opponent model is specified. If an opponent model
         * is specified, then the agent return a bid according to the opponent model
         * strategy.
         */
        @Override
        public BidDetails determineNextBid() {          
                double time = negotiationSession.getTime();
                double TargetValue;
                
                if (p(time) < reservationValue)
                        TargetValue = reservationValue;
                else
                        TargetValue = p(time);
                
                // In case there is no model, just be time dependent
                if (opponentModel instanceof NoModel) {
                        nextBid = negotiationSession.getOutcomeSpace().getBidNearUtility(TargetValue);
                } else {
                        nextBid = omStrategy.getBid(outcomespace, TargetValue);
                }
                
                return nextBid;
        }

        public double f(double t) {
                // First 10% of session: Slowly come up from bids with util .9 to allow the opponent to model us.
                if (t < .1)
                {
                        return 20*(t-0.1)*(t-0.1);
                }
                else
                {
                        if (e == 0)
                                return k;
                        
                        double ft = k + (1 - k) * Math.pow(t, 1.0 / e);
                        return ft;
                }

        }

        public double p(double t) {
                return Pmin + (Pmax - Pmin) * (1 - f(t));
                        
        }
        
        public NegotiationSession getNegotiationSession() {
                return negotiationSession;
        }

        @Override
        public Set<BOAparameter> getParameterSpec() {
                Set<BOAparameter> set = new HashSet<BOAparameter>();
                set.add(new BOAparameter("e", this.e, "Concession rate"));
                set.add(new BOAparameter("k", this.k, "Offset"));
                set.add(new BOAparameter("min", this.Pmin, "Minimum utility"));
                set.add(new BOAparameter("max", this.Pmax, "Maximum utility"));

                return set;
        }

        @Override
        public String getName() {
                return "HardDealer_BS";
        }
}