source: src/main/java/negotiator/boaframework/acceptanceconditions/other/AC_CombiProb.java

package negotiator.boaframework.acceptanceconditions.other;

import java.util.Map;

import genius.core.BidHistory;
import genius.core.boaframework.AcceptanceStrategy;
import genius.core.boaframework.Actions;
import genius.core.boaframework.NegotiationSession;
import genius.core.boaframework.OfferingStrategy;
import genius.core.boaframework.OpponentModel;

/**
 * This is the decoupled Acceptance Conditions Based on Tim Baarslag's paper on
 * Acceptance Conditions: "Acceptance Conditions in Automated Negotiation"
 * 
 * This Acceptance Condition accepts a bid if it is higher than any bid seen so
 * far
 * 
 * Decoupling Negotiating Agents to Explore the Space of Negotiation Strategies
 * T. Baarslag, K. Hindriks, M. Hendrikx, A. Dirkzwager, C.M. Jonker
 * 
 * @author Alex Dirkzwager
 */
public class AC_CombiProb extends AcceptanceStrategy {

        private double time;

        /**
         * Empty constructor for the BOA framework.
         */
        public AC_CombiProb() {
        }

        public AC_CombiProb(NegotiationSession negoSession, OfferingStrategy strat, double t) {
                this.negotiationSession = negoSession;
                this.offeringStrategy = strat;
                this.time = t;
        }

        @Override
        public void init(NegotiationSession negoSession, OfferingStrategy strat, OpponentModel opponentModel,
                        Map<String, Double> parameters) throws Exception {
                this.negotiationSession = negoSession;
                if (parameters.get("t") != null) {
                        time = parameters.get("t");
                } else {
                        throw new Exception("Paramaters were not correctly set");
                }
        }

        @Override
        public String printParameters() {
                return "[t: " + time + "]";
        }

        @Override
        public Actions determineAcceptability() {
                if (negotiationSession.getOpponentBidHistory().getLastBidDetails().getMyUndiscountedUtil() >= offeringStrategy
                                .getNextBid().getMyUndiscountedUtil()) {
                        return Actions.Accept;
                }

                if (negotiationSession.getTime() < time) {
                        return Actions.Reject;
                }

                double offeredUndiscountedUtility = negotiationSession.getOpponentBidHistory().getLastBidDetails()
                                .getMyUndiscountedUtil();
                double now = negotiationSession.getTime();
                double timeLeft = 1 - now;

                // if we will still see a lot of bids
                BidHistory recentBids = negotiationSession.getOpponentBidHistory().filterBetweenTime(now - timeLeft, now);
                int remainingBids = recentBids.size();
                if (remainingBids > 10)
                        return Actions.Reject;

                // v2.0
                double window = timeLeft;
                // double window = 5 * timeLeft;
                BidHistory recentBetterBids = negotiationSession.getOpponentBidHistory()
                                .filterBetween(offeredUndiscountedUtility, 1, now - window, now);
                int n = recentBetterBids.size();
                double p = timeLeft / window;
                if (p > 1)
                        p = 1;

                double pAllMiss = Math.pow(1 - p, n);
                if (n == 0)
                        pAllMiss = 1;
                double pAtLeastOneHit = 1 - pAllMiss;

                double avg = recentBetterBids.getAverageUtility();

                double expectedUtilOfWaitingForABetterBid = pAtLeastOneHit * avg;

                if (offeredUndiscountedUtility > expectedUtilOfWaitingForABetterBid)
                        return Actions.Accept;

                return Actions.Reject;
        }

        @Override
        public String getName() {
                return "Other - CombiProb";
        }

}