source: src/main/java/parties/in4010/q12015/group3/Group3.java@ 47

package parties.in4010.q12015.group3;

import java.util.List;

import java.util.ArrayList;
import java.util.Arrays;

import genius.core.AgentID;
import genius.core.Bid;
import genius.core.actions.Accept;
import genius.core.actions.Action;
import genius.core.actions.ActionWithBid;
import genius.core.actions.DefaultAction;
import genius.core.actions.EndNegotiation;
import genius.core.actions.Offer;
import genius.core.bidding.BidDetails;
import genius.core.boaframework.OutcomeSpace;
import genius.core.boaframework.SortedOutcomeSpace;
import genius.core.issue.Value;
import genius.core.parties.AbstractNegotiationParty;
import genius.core.parties.NegotiationInfo;

/**
 * This is your negotiation party.
 */
public class Group3 extends AbstractNegotiationParty {
        private double alfa;
        private double beta;

        private double MIN_BID_UTILITY;
        private double LEARNING_TIME;
        private SortedOutcomeSpace sortedBids;
        private OutcomeSpace space;

        private double opponentWeights[];
        private double WEIGHT_PARAMETER = 0.1;

        private List<Action> opponentActions;
        private Bid previousBidOpponent;
        private double HIGH_WEIGHT;
        private int HAMMING_THRESHOLD;

        private List<Double> opponentUtils = new ArrayList<Double>();
        private double ACCEPTANCE_THRESHOLD;

        private int roundsCounter;

        public void receiveMessage(AgentID sender, Action action) {
                super.receiveMessage(sender, action);
                this.opponentActions.add(action);
        }

        public String getDescription() {
                return "Group 3.oct-19-4.2";
        }

        @Override
        public void init(NegotiationInfo info) {
                super.init(info);
                System.out.println("\n");
                System.out.println("####### STARTING SESSION #########");
                System.out.println("Initializing Agent");

                this.space = new OutcomeSpace(getUtilitySpace());
                sortedBids = new SortedOutcomeSpace(getUtilitySpace());
                this.opponentActions = new ArrayList<Action>();

                super.timeline = timeline;
                super.utilitySpace = getUtilitySpace();

                this.LEARNING_TIME = 0.1 * info.getDeadline().getValue();
                this.HAMMING_THRESHOLD = 3;
                this.HIGH_WEIGHT = 0.15;
                this.ACCEPTANCE_THRESHOLD = 0.75;

                this.alfa = 0.05;
                this.beta = -Math.log(alfa) / info.getDeadline().getValue();
                this.MIN_BID_UTILITY = 0.8;

                opponentWeights = new double[getUtilitySpace().getDomain().getIssues().size()];
                this.previousBidOpponent = null;

                for (int i = 0; i < getUtilitySpace().getDomain().getIssues().size(); i++)
                        opponentWeights[i] = 1 / (double) (getUtilitySpace().getDomain().getIssues().size());

                roundsCounter = 0;

                System.out.println("Initialization Completed!");
                System.out.println("Opponent Model: " + Arrays.toString(opponentWeights));
        }

        /**
        
         */
        @Override
        public Action chooseAction(List<Class<? extends Action>> validActions) {
                Action action = null;
                Action lastBidResponse = null;
                Bid nextBid = null;

                double opponentUtility, myUtility;

                System.out.println("\nROUND #" + roundsCounter++);

                if (opponentActions.isEmpty())
                        return new Offer(getPartyId(), getNextBid(null));

                try {
                        lastBidResponse = opponentActions.get(0);

                        Bid toBeAccepted = DefaultAction.getBidFromAction(opponentActions.get(opponentActions.size() - 1));

                        Bid toBeModeled = DefaultAction.getBidFromAction(lastBidResponse);

                        /* First we update the model of our opponent */
                        if (lastBidResponse instanceof Offer)
                                opponentWeights = this.updateModel(toBeModeled, opponentWeights);

                        if (lastBidResponse instanceof Accept) {
                                System.out.println("Reoffering previous Bid:");

                                toBeModeled = this.previousBidOpponent;
                        }

                        System.out.println("Opponent Model: " + Arrays.toString(opponentWeights));

                        /*
                         * Second, we choose the next bid wrt the preferences of the next
                         * opponent
                         */
                        nextBid = this.getNextBid(toBeModeled);

                        /* Last, we decide whether to accept the last bid or propose ours */
                        myUtility = getUtility(nextBid);
                        opponentUtility = getUtility(toBeAccepted);

                        if (isAcceptable(opponentUtility, myUtility)) {
                                System.out.println("Accepting Bid with utility: " + opponentUtility);
                                System.out.println(toBeAccepted.toString());
                                action = new Accept(getPartyId(), ((ActionWithBid) getLastReceivedAction()).getBid());
                        } else
                                action = new Offer(getPartyId(), nextBid);

                        /* Update parameters */
                        opponentUtils.add(opponentUtility);

                        this.previousBidOpponent = toBeModeled;
                } catch (Exception e) {
                        System.out.println("CHOOSE ACTION");
                        e.printStackTrace();
                        System.out.println("List of opponent actions:\n" + opponentActions.toString());
                        action = new EndNegotiation(getPartyId());
                }

                this.opponentActions.clear();

                return action;
        }

        /************************
         * ACCEPTANCE STRATEGY
         ****************************************/

        // ACcombi(T, MAXw)
        private boolean isAcceptable(double offeredUtilFromOpponent, double myOfferedUtil) {
                double time = timeline.getCurrentTime();
                double timeThreshold = ACCEPTANCE_THRESHOLD * getDeadlines().getValue();

                // ACnext
                if (offeredUtilFromOpponent > myOfferedUtil)
                        return true;

                // ACtime
                if (time > timeThreshold) {
                        // ACmaxW
                        if (offeredUtilFromOpponent > getMaxValue(opponentUtils))
                                return true;
                }

                return false;
        }

        public double getMaxValue(List<Double> values) {
                double maxValue = Double.MIN_VALUE;

                try {
                        for (Double d : values) {
                                if (d > maxValue) {
                                        maxValue = d;
                                }
                        }
                } catch (Exception e) {
                        System.out.println("GETMAXVALUE");
                        e.printStackTrace();
                }

                return maxValue;
        }

        /************************
         * BIDDING STRATEGY
         ****************************************/
        private boolean compareValues(Value v1, Value v2) {
                String v1Str = v1.toString();
                String v2Str = v2.toString();

                return v1Str.equals(v2Str);
        }

        private int computeHammingDistance(Bid b1, Bid b2) {
                int nIssues = b1.getIssues().size();
                int distance = 0;

                /*
                 * IF issues are different IF weight for that issue is small distance =
                 * 1 ELSE distance = 2
                 */

                for (int i = 1; i <= nIssues; i++) {
                        try {
                                if (!compareValues(b1.getValue(i), b2.getValue(i)))
                                        distance += opponentWeights[i - 1] > HIGH_WEIGHT ? 2 : 1;
                        } catch (Exception e) {
                                System.out.println("HAMMING");
                                e.printStackTrace();
                        }
                }

                return distance;
        }

        private Bid getNextBid(Bid opponent) {
                double time = timeline.getCurrentTime();
                double targetUtility;

                if (opponent == null) {
                        System.out.println("No previous bids to evaluate.");
                        return space.getMaxBidPossible().getBid();
                }

                List<BidDetails> allBids = this.sortedBids.getAllOutcomes();// space.getAllOutcomes();

                double maxUtility = 0;
                Bid maxUtilityBid = null;

                if (time < LEARNING_TIME) {
                        System.out.println("Learning period: bidding max.");
                        return space.getMaxBidPossible().getBid();
                }

                for (java.util.Iterator<BidDetails> i = allBids.iterator(); i.hasNext();) {
                        Bid bid = i.next().getBid();

                        if (getUtility(bid) < MIN_BID_UTILITY)
                                break;

                        if (computeHammingDistance(opponent, bid) < HAMMING_THRESHOLD)

                                if (getUtility(bid) > maxUtility) {
                                        maxUtility = getUtility(bid);
                                        maxUtilityBid = bid;
                                }
                }

                if (maxUtility > MIN_BID_UTILITY) {
                        System.out.println("Hamming Utility: " + maxUtility);
                        return maxUtilityBid;
                }

                targetUtility = 1 - alfa * Math.exp(beta * (time - LEARNING_TIME));

                System.out.println("Exponential decay: " + targetUtility);

                if (targetUtility < MIN_BID_UTILITY) {
                        System.out.println("Lower threshold reached.");
                        targetUtility = MIN_BID_UTILITY;
                }

                return sortedBids.getBidNearUtility(targetUtility).getBid();
        }

        /** OPPONENT MODELING */
        private double[] updateModel(Bid newBid, double[] currentWeights) {
                double sum = 0;

                if (previousBidOpponent == null)
                        return currentWeights;

                for (int i = 1; i <= newBid.getIssues().size(); i++) {
                        try {
                                if (newBid.getValue(i) == previousBidOpponent.getValue(i))
                                        currentWeights[i - 1] += WEIGHT_PARAMETER;

                                sum += currentWeights[i - 1];
                        } catch (Exception e) {
                                System.out.println("UPDATE 1");
                                e.printStackTrace();
                        }
                }

                try {
                        for (int i = 0; i < newBid.getIssues().size(); i++)
                                currentWeights[i] = currentWeights[i] / sum;
                } catch (Exception e) {
                        System.out.println("UPDATE 2");
                        e.printStackTrace();
                }

                return currentWeights;
        }

}