source: src/main/java/parties/in4010/q12015/group6/Group6.java@ 126

package parties.in4010.q12015.group6;

import java.util.List;
import java.util.Random;
import java.util.Set;
import java.util.TreeMap;

import genius.core.Bid;
import genius.core.actions.Accept;
import genius.core.actions.Action;
import genius.core.actions.Offer;
import genius.core.parties.AbstractNegotiationParty;

/**
 * This is your negotiation party.
 */
public class Group6 extends AbstractNegotiationParty {
        // Make data available throughout the code
        private Bid opponentbestbid = null;
        private Bid myBid;
        private Boolean firstround = true;
        private Bid bestBid = null;
        private double utilBestbid = 0D;
        private Bid partnerBid;
        private double offeredUtilFromOpponent = 0;
        private TreeMap<Double, Bid> OpponentModel = new TreeMap<Double, Bid>();
        private double oppUtil;

        private Action actionOfPartner = null;
        private Bid oppBid;

        /**
         * init is called when a next session starts with the same opponent.
         */
        // Initially we initialized our opponentModel here but this gave a
        // nullpointerexception.
        public void init() {

        }

        // Receive the incoming action of the other agents.
        public void receiveMessage(java.lang.Object sender, Action opponentAction) {
                // actionOfPartner is defined in the beginning of the code and is
                // defined as private
                // Meaning that other parts of the code can access the opponentAction.
                actionOfPartner = opponentAction;

                // The opponent model is only update if the action of partner is an
                // offer.
                if (actionOfPartner instanceof Offer) {
                        oppBid = ((Offer) actionOfPartner).getBid();
                        oppUtil = getUtility(oppBid);
                        // The current offer is inserted into the opponent model
                        updateOpponentModel(oppUtil, oppBid);
                }
                // System.out.println("Size: "+ OpponentModel.size());
        }

        // The Action that is send to genius based on the opponentAction is
        // generated here.
        @Override
        public Action chooseAction(List<Class<? extends Action>> validActions) {

                // The Utility threshold is retrieved, this will be used to choose
                // whether to accept or make a counter bid.
                double minUtil = getNewThreshold();
                Action action = null;
                try {
                        if (validActions.contains(Accept.class)) {
                                // if action of partner is instance of accept.
                                // decide to accept or offer.

                                // System.out.println("Minimum Util: " + minUtil);

                                // If the offered utility of the opponent is higher than the
                                // utility of
                                // our threshold a Accept will be returned.
                                if (oppUtil > minUtil) {
                                        return new Accept(getPartyId(), oppBid);
                                }

                                // A bid will be retrieved from our bidselector.
                                action = chooseRandomBidAction(minUtil);

                                Bid myBid = ((Offer) action).getBid();
                                double myOfferedUtil = getUtility(myBid);
                                System.out.println("Generated bid: " + myOfferedUtil);

                                // A set of all the opponent best bids that have been stored are
                                // generated.
                                Set<Double> keys = OpponentModel.keySet();

                                // A random number is generated to
                                // randomly select a bid from the opponentModel.
                                Random randomGenerator = new Random();
                                int randomInt = randomGenerator.nextInt(5) + 1;
                                int keyId = 1;

                                // The key of a bid is given an ID so that
                                // using the randomInt a bid can be retrieved from
                                // the opponentModel.
                                for (Double key : keys) {
                                        if (keyId == randomInt) {
                                                bestBid = OpponentModel.get(key);
                                        }
                                        keyId++;
                                }

                                // The utility of the retrieved bid is generated here
                                utilBestbid = getUtility(bestBid);
                                System.out.println("Best bid: " + utilBestbid);

                                // Based on the utility of the bestBid that was retrieved
                                // a offer will be made. If the utility of the best bid is
                                // higher than the offered utility of the opponent a new
                                // bid will be placed.
                                if (myOfferedUtil < utilBestbid) {
                                        // System.out.println("Util: " + utilBestbid + " Bid: " +
                                        // bestBid);
                                        action = new Offer(getPartyId(), bestBid);
                                }
                        }

                        if (!validActions.contains(Accept.class))
                        // if action of partner is not instance of accept
                        // choose to offer a counter bid.
                        {
                                action = chooseRandomBidAction(minUtil);

                        }

                        // If anything goes wrong
                } catch (Exception e) {
                        System.out.println("Exception in ChooseAction:" + e.getMessage());
                        action = new Accept(getPartyId(), oppBid); // best guess if things
                                                                                                                // go wrong.
                }
                return action;
        }

        // This is our Bid selector which choose a bid based on
        // a given floor entry. The bid selector works by randomly
        // generating bids. As soon as a bid goes above the utility
        // Threshold the bid will be returned.
        private Action chooseRandomBidAction(Double minUtil) {
                Bid nextBid = null;
                // generate the random bids.
                nextBid = generateRandomBid();
                double util = getUtility(nextBid);

                System.out.println("Minimum Util: " + minUtil);

                // The a new bid will be generated if the utility of
                // the previous random bid is bellow the threshold.
                // Once the generated bid goes above the threshold
                // the nextBid becomes myBid.
                while (util < minUtil) {
                        nextBid = generateRandomBid();
                        util = getUtility(nextBid);
                        System.out.println("Util: " + util);
                }
                // This returns accept if anything goes wrong.
                if (nextBid == null)
                        return (new Accept(getPartyId(), oppBid));

                // This returns myBid as an offer.
                return (new Offer(getPartyId(), nextBid));
        }

        // The threshold is generated using a time based
        // method. Based on the time the negotiation has
        // been running a threshold is calculated.
        private double getNewThreshold() {
                double utilThreshold = 0.0;
                double time = timeline.getTime(); // retrieve the elapsed time
                if (time <= (60.0 / 180.0)) {
                        utilThreshold = 0.85 + 0.1 * time; // Generate an increasing
                                                                                                // threshold, starting at 0.85
                }
                if (time <= (140.0 / 180.0) && time >= (60.0 / 180.0)) {
                        utilThreshold = 0.85; // The threshold remains steady
                }
                if (time > (140.0 / 180.0) && time < (160.0 / 180.0)) {
                        utilThreshold = 1.1 - 0.38 * time; // utilThreshold starts at 0.80
                                                                                                // and decreases to 0.74
                }
                if (time > (160.0 / 180.0)) {
                        utilThreshold = 1.18 - 0.5 * time; // utilThreshold starts at 0.72
                                                                                                // and decreases to 0.65
                }
                // System.out.println("Time: " + time);
                // System.out.println("Util: " + utilThreshold);
                // Return the calculated threshold
                return utilThreshold;
        }

        // The opponentModel works by placing the opponent bids in order.
        // A max of 5 bids are stored, meaning that the lowest bid will be discarded
        // if the amount of bids exceeds the maximum amount of 5.
        public TreeMap<Double, Bid> updateOpponentModel(double OfferedUtil, Bid OfferedBid) {
                // If the max size is below 5 or the offered utility is above the lowest
                // utility
                // update the opponentmodel.
                if (OpponentModel.size() < 5 || OpponentModel.firstEntry().getKey() < OfferedUtil) {
                        // if oppentmodel size is already 5 remove the lowest bid and add
                        // the new higher bid.
                        if (OpponentModel.size() == 5) {
                                // System.out.println("Removed Opponent Model utility:"
                                // +OpponentModel.firstEntry().getKey());
                                OpponentModel.remove(OpponentModel.firstEntry().getKey());
                        }
                        // Add the new bid to the opponentmodel
                        OpponentModel.put(OfferedUtil, OfferedBid);
                        // System.out.println("With utility:" + OfferedUtil);
                }
                // System.out.println("check size: "+ OpponentModel.size());
                return OpponentModel;
        }

        @Override
        public String getDescription() {
                return "in4010.q12015.group6";
        }
}