source: src/main/java/onetomany/bargainingchipsgame/interactions/Offer.java@ 280

package onetomany.bargainingchipsgame.interactions;

import onetomany.bargainingchipsgame.Bundle;
import onetomany.bargainingchipsgame.BundleBuilder;

/**
 * An offer has two parts: (1) a bundle or null, (2) a message code: `bid', `accept', `end'.
 * When the code is 'bid', the first part is checked; for the two latter codes, the first part of the offer is null.
 * In other words, message `bid' means that offer contains a bundle which is proposed, `accept' means offer contains no bundle to propose, 
 * but an agreement with the deal (the received offer), and `end' again means that nothing to propose, and quitting the negotiation.
 * 
 * Immutable.
 */
public class Offer 
{
        /** 
         * Message codes: 
         * (1) `bid' [body contains a bundle], 
         * (2) `accept' [agree with the deal (based on the rules); null body], 
         * (3) `end' [quitting the negotiation; null body]
         */
        private final OfferType type; 
        private final Bundle bundle;
        
        /**
         * Creates a bid. Bundle is immutable and therefore so is Offer.
         */
        public Offer(Bundle b)
        {
                bundle = b;
                type = OfferType.BID;
        }

        /**
         * @return the proposal
         */
        public Bundle getBundle() 
        {
                return bundle;
        }
        
        @Override
        public String toString() 
        {
                if (type != OfferType.BID)
                        return type.toString();
                else
                        return type.toString() + ": " + bundle.toString();
        }
        
        public static Offer getSampleOffer(int qty)
        {
                return getSampleOffer("Red", qty);
        }
        
        /**
         * Just a sample example of an offer
         */
        public static Offer getSampleOffer(String color, int qty)
        {
                Bundle bundle = new BundleBuilder()
                                .addStack(color, 7.0, qty)
                                .build();
                return new Offer(bundle);
        }
}