package protocol;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import onetomany.bargainingchipsgame.interactions.Accept;
import onetomany.bargainingchipsgame.interactions.Offer;
import onetomany.bargainingchipsgame.interactions.OfferBy;

public class AsynchronousOffersProtocol extends BilateralProtocol 
{

	public AsynchronousOffersProtocol(BlockingQueue<Offer> fromA,
			BlockingQueue<Offer> toA, BlockingQueue<Offer> fromB,
			BlockingQueue<Offer> toB) {
		super(fromA, toA, fromB, toB);
		// TODO Auto-generated constructor stub
	}

	/**
	 * An offer is valid iff:
	 * 1) An offer or walk-away is sent by anyone at any time: $o_{t+1} \in \Omega \cup \{End\}$; or
     * 2) A bid is accepted by the other: $o_{t+1} = Accept$ and $o_{t}\in\Omega$ and $g_t \neq g_{t+1}$; or
     * 3) An accept is acknowledged, concluding the thread: $o_{t+1} = Accept$ and $o_{t} = Accept$ and $o_{t-1} \in \Omega$ and $g_{t-1} = g_{t+1} \neq g_{t}$.
	 */	
	@Override
	protected boolean validate(OfferBy curOffer) 
	{
		// 1)
		if (curOffer.isBid() || curOffer.isEnd())
			return true;
		
		// 2)
		if (log.size() < 2) 		// o_t should exist
			return false;
		
		String curSender = curOffer.getSender();
		OfferBy prevOffer = getLastOffer();
		String prevSender = prevOffer.getSender();
		if (curOffer.isAccept() && prevOffer.isBid() && !curSender.equals(prevSender))
			return true;
		
		// 3)
		if (log.size() < 3) 		// o_{t-1} should exist
			return false;
		
		OfferBy prevprev = log.get(log.size() - 2);
		String prevprevSender = prevprev.getSender();
		
		if (curOffer.isAccept() && prevOffer.isAccept() 
				&& prevprev.isBid() && prevprevSender.equals(curSender) 
				&& !curSender.equals(prevSender))
			return true;
		
		return false;
	}
	
	public static void main(String[] args) throws InterruptedException 
	{
		BlockingQueue<Offer> fromA  = new LinkedBlockingQueue<Offer>();
		BlockingQueue<Offer> toA	= new LinkedBlockingQueue<Offer>();
		BlockingQueue<Offer> fromB  = new LinkedBlockingQueue<Offer>();
		BlockingQueue<Offer> toB	= new LinkedBlockingQueue<Offer>();
		
		AsynchronousOffersProtocol aop = new AsynchronousOffersProtocol(fromA, toA, fromB, toB);
		
		Thread aopThread = new Thread(aop);
		aopThread.start();
		
		fromA.put(Offer.getSampleOffer(3));
		Thread.sleep(1000);
		fromA.put(Offer.getSampleOffer(6));
		Thread.sleep(1000);
		fromB.put(Offer.getSampleOffer(7));
		Thread.sleep(1000);
		fromA.put(new Accept(Offer.getSampleOffer(6)));
		
		Thread.sleep(1000);
		System.out.println(toB);
	}

}