source: src/main/java/agents/anac/y2019/podagent/Group1_BS.java

package agents.anac.y2019.podagent;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Random;

import genius.core.Bid;
import genius.core.bidding.BidDetails;
import genius.core.boaframework.NegotiationSession;
import genius.core.boaframework.OMStrategy;
import genius.core.boaframework.OfferingStrategy;
import genius.core.boaframework.OpponentModel;
import genius.core.boaframework.SortedOutcomeSpace;
import genius.core.misc.Range;
import genius.core.uncertainty.UserModel;

public class Group1_BS extends OfferingStrategy {

        private final int HOW_MANY_BIDS_TO_START_WITH = 5;
        private boolean panicMode = false;
        private boolean extremePanicMode = false;
        private double targetUtility = 1;
        private double undiscountedTargetUtil = 1;
        private double timeLimitForStep = 0.1;
        private List<BidDetails> possibleBids = null;
        private double lastStepTime = 0;
        private NegotiationSession negoSession;
        public OpponentModel opponentModel;
        private SortedOutcomeSpace outcomespace;
        private boolean hardHeaded = false;
        private boolean omHardHeaded = false;
        private Random rand = new Random();
        private Double reservation;


        @Override
        public void init(NegotiationSession negoSession, OpponentModel model, OMStrategy oms,
                        Map<String, Double> parameters) throws Exception {
                super.init(negoSession, parameters);
                this.negoSession = negoSession;
                this.reservation = negoSession.getUtilitySpace().getReservationValue();
                if(this.reservation == null) {
                        System.out.println("No reservation");
                }
                this.opponentModel = model;
                outcomespace = new SortedOutcomeSpace(negotiationSession.getUtilitySpace());
                negotiationSession.setOutcomeSpace(outcomespace);
                setNewStep();
        }

        @Override
        public BidDetails determineOpeningBid() {
                int bidI = rand.nextInt(HOW_MANY_BIDS_TO_START_WITH);
                bidI = Math.min(bidI, possibleBids.size() - 1);
                return possibleBids.remove(bidI);
        }

        @Override
        public BidDetails determineNextBid() {
                setPanicModeIfNeccesary();

                if (extremePanicMode) {
                        return negoSession.getOpponentBidHistory().getBestBidDetails();
                }

                if (possibleBids.isEmpty() || negoSession.getTime() >= timeLimitForStep + lastStepTime || panicMode) {
                        setNewStep();
                }
                BidDetails bestBid = null;
                double bestOpponentUtility = 0;
                for (BidDetails bid : possibleBids) {
                        double opponentUtil = opponentModel.getBidEvaluation(bid.getBid());
                        if (opponentUtil > bestOpponentUtility) {
                                bestBid = bid;
                                bestOpponentUtility = opponentUtil;
                        }
                }

                possibleBids.remove(bestBid);
                return bestBid;
        }

        @Override
        public String getName() {
                return "Group1_BS";
        }

        /**
         * Calculate concession rate depending on time and friendliness factor
         * 
         * @return concession rate between 0 and 1
         */
        public double getCurrentConcessionRate() {
                double time = negoSession.getTime(); // Between 0 and 1
                double friendlinessFactor = getFriendlinessFactor();
                // Concession function 1 - t^3
                double timeDiscount = (this.undiscountedTargetUtil - (1 - Math.pow(time, 3)));
                // Concession amount is scaled by friendliness factor
                double discount = timeDiscount * friendlinessFactor;
                this.undiscountedTargetUtil = (1 - Math.pow(time, 3));
                double newUtility = this.targetUtility - discount;
                if (newUtility < this.reservation) {
                        return this.reservation;
                }
                if (newUtility > 1) {
                        return 1;
                } else if (newUtility < 0) {
                        return 0;
                }
                return newUtility;
        }

        /**
         * Reads the friendliness factor from the opponent model
         * 
         * @return value between 0 and 1 that indicates the willingness of our opponent
         *         to cooperate
         */
        private double getFriendlinessFactor() {
                // If the panic mode is on, ignore the friendliness factor
                if (panicMode) {
                        return 1;
                } else if (opponentModel instanceof Group1_OM) {
                        omHardHeaded = ((Group1_OM) opponentModel).isHardHeaded();
                        return ((Group1_OM) opponentModel).getOpponentSentiment(lastStepTime);
                }
                // Fallback
                else {
                        return 0.5;
                }
        }

        /**
         * Panic mode depending on passed time
         */
        private void setPanicModeIfNeccesary() {
                // Extreme panic in the last 33% of panic mode
                if (!extremePanicMode && 1 - negoSession.getTime() < 0.05 / 3) {
                        extremePanicMode = true;
                }
                // Panic in the last 5% of negotiation time
                if (!panicMode && 1 - negoSession.getTime() < 0.05) {
                        panicMode = true;
                        hardHeaded = omHardHeaded;
                }
        }

        /**
         * New step - recalculate concession and range of good bids
         */
        private void setNewStep() {
                // Make sure the steps don't get too small
                timeLimitForStep = timeLimitForStep > 0.01 ? timeLimitForStep * 0.9 : timeLimitForStep;
                if (!hardHeaded) {
                        targetUtility = getCurrentConcessionRate();
                } else {
                        // Go back to 1 against hard headed opponents
                        targetUtility = 1;
                }
                // Set range of possible bids
                Range range = new Range(targetUtility, 1);
                possibleBids = negoSession.getOutcomeSpace().getBidsinRange(range);
                lastStepTime = this.negotiationSession.getTime();
        }

        /**
         * Getter for panic mode
         * 
         * @return panic mode status
         */
        public Boolean getPanicMode() {
                return (panicMode);
        }
}