source: src/main/java/parties/in4010/q12015/group16/Group16.java@ 3

package parties.in4010.q12015.group16;

import java.util.List;

import genius.core.AgentID;
import genius.core.Bid;
import genius.core.actions.Accept;
import genius.core.actions.Action;
import genius.core.actions.NoAction;
import genius.core.actions.Offer;
import genius.core.boaframework.SortedOutcomeSpace;
import genius.core.parties.AbstractNegotiationParty;
import genius.core.parties.NegotiationInfo;
import genius.core.utility.AdditiveUtilitySpace;

/**
 * This is your negotiation party.
 */
public class Group16 extends AbstractNegotiationParty {
        // Utility value below which no bids will be accepted
        private double reservationValue = 0.7;
        // Utility value of the worst bid we can make
        private double bidLowerBound = 0.9;
        // Utility value of the best bid we can make
        private double bidUpperBound = 1.0;

        // The general model
        private GeneralModel GM;

        // Index for all possible bids sorted by utility
        private SortedOutcomeSpace outcomeSpace;

        // The most recent action and offer received from an opponent, updated in
        // receiveMessage
        private Action lastReceivedAction = null;
        private Bid lastReceivedOffer = null;

        /**
         * This is the first call made to a NegotiationParty after its
         * instantiation. Tells which utility space and timeline we are running in.
         * This is called one time only.
         * 
         * @param utilSpace
         *            (a copy of/ read-only version of) the UtilitySpace to be used
         *            for this session.
         * @param timeline
         *            the TimeLineInfo about current session.
         * @param agentID
         *            the AgentID.
         * @throws RuntimeException
         *             if init() fails.
         */
        @Override
        public void init(NegotiationInfo info) {
                super.init(info);

                utilitySpace.setDiscount(0);
                utilitySpace.setReservationValue(reservationValue);

                try {
                        outcomeSpace = new SortedOutcomeSpace(utilitySpace);
                } catch (Exception e) {
                        e.printStackTrace();
                }

                GM = new GeneralModel((AdditiveUtilitySpace) utilitySpace, outcomeSpace);
        }

        /**
         * Each round this method gets called and ask you to accept or offer. The
         * first party in the first round is a bit different, it can only propose an
         * offer.
         *
         * @param validActions
         *            Either a list containing both accept and offer or only offer.
         * @return The chosen action.
         */
        @Override
        public Action chooseAction(List<Class<? extends Action>> validActions) {
                Action action = new NoAction(getPartyId());

                if (lastReceivedAction instanceof Offer || lastReceivedAction instanceof Accept) {
                        if (isAcceptable(lastReceivedOffer)) {
                                return new Accept(getPartyId(), lastReceivedOffer);
                        }
                }
                if (validActions.contains(Offer.class)) {
                        return new Offer(getPartyId(), getBid());
                }

                return action;
        }

        /**
         * All offers proposed by the other parties will be received as a message.
         * You can use this information to your advantage, for example to predict
         * their utility.
         *
         * @param sender
         *            The party that did the action.
         * @param action
         *            The action that party did.
         */
        @Override
        public void receiveMessage(AgentID sender, Action action) {
                super.receiveMessage(sender, action);
                lastReceivedAction = action;

                if (action instanceof Offer) {
                        try {
                                GM.getOpponent(action.getAgent()).update(((Offer) action).getBid());
                                lastReceivedOffer = ((Offer) action).getBid();
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                }
        }

        /**
         * If we're in the first half of the negotiation, returns bids within the
         * [bidLowerBound, bidUpperBound] interval. If we're in the second half of
         * the negotiation, tries to get the next bid from the GeneralModel. If this
         * fails, falls back to the first method of returning bids.
         * 
         * @return bid to offer next
         */
        private Bid getBid() {
                Bid bid = null;
                if (getTimeLine().getTime() <= 0.65) {
                        bid = getBidWithinBounds();
                } else {
                        try {
                                if (!GM.isGenerated())
                                        GM.generate();
                                bid = GM.getProposal();
                                if (bid == null) {
                                        bidLowerBound = bidLowerBound - 0.1;
                                        bidUpperBound = bidUpperBound - 0.1;
                                        bid = getBidWithinBounds();
                                }
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                }
                return bid;
        }

        /**
         * @return bid with utility in the [bidLowerBound, bidUpperBound] interval.
         */
        private Bid getBidWithinBounds() {
                double randomUtility = bidLowerBound + (bidUpperBound - bidLowerBound) * rand.nextDouble();
                return outcomeSpace.getBidNearUtility(randomUtility).getBid();
        }

        /**
         * Determines whether b is acceptable
         * 
         * @param b
         *            bid to accept or reject
         * @return true if b should be accepted
         */
        private boolean isAcceptable(Bid b) {
                if (getTimeLine().getTime() <= 0.5) {
                        // Before half of the negotiation, accept a bid if its utility is
                        // equal to or higher than the utility of the best bid we can make
                        return getUtility(b) >= bidUpperBound;
                } else if (getTimeLine().getTime() <= 0.97) {
                        // Concede after half of the negotiation
                        return getUtility(b) >= reservationValue + 0.15;
                } else {
                        // In the last phase of a negotiation, accept a bid if its utility
                        // is equal to or higher than our reservation value
                        return getUtility(b) >= reservationValue;
                }
        }

        @Override
        public String getDescription() {
                return "This is Agent 16, deal with it";
        }
}