source: ai2020/group6/PowerWeightedOptInStrategy.java@ 4

package ai2020.group6;

import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import geniusweb.actions.PartyId;
import geniusweb.actions.Vote;
import geniusweb.actions.Votes;
import geniusweb.issuevalue.Bid;

/**
 * PowerWeightedOptInStrategy collects the amount of power backing a bid such that
 * more sophisticated strategies could use this.
 * 
 * @author Group 6
 */
public abstract class PowerWeightedOptInStrategy implements IOptInStrategy {

        public abstract Vote vote ( MAState state, Bid bid, Integer power, Integer minpower );

        @Override
        public Votes optInVote(MAState state, List<Votes> votes) {
                Map<PartyId, Integer> agentpowers = state.getPowerMap();
                Map<Bid, Integer> bidpowers = new HashMap<>();
                Map<Bid, Integer> bidthresholds = new HashMap<>();
                votes.stream().forEach(agentvotes -> {
                        PartyId agentid = agentvotes.getActor();
                        agentvotes.getVotes().forEach(vote -> {
                                Integer power = bidpowers.getOrDefault(vote.getBid(), 0);
                                Integer minpower = bidthresholds.getOrDefault(vote.getBid(), 0);
                                power += agentpowers.getOrDefault(agentid, 0);
                                bidpowers.put(vote.getBid(), power);
                                bidthresholds.put(vote.getBid(), Math.max(vote.getMinPower(), minpower));
                        });
                });
                Set<Vote> optin = new HashSet<Vote>();
                bidpowers.forEach((bid, power) -> {
                        Vote vote = vote(state, bid, bidpowers.getOrDefault(bid, 0), bidthresholds.getOrDefault(bid, 0));
                        if (vote != null)
                                optin.add(vote);
                });

                return new Votes(state.getId(), optin);         
        }

}