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package com.sun.grizzly.ssl;

import java.io.IOException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult.HandshakeStatus;
import com.sun.grizzly.Connection;
import com.sun.grizzly.Grizzly;
import com.sun.grizzly.impl.ReadyFutureImpl;

/**
 * Blocking {@link SSLHandshaker} implementation.
 *
 * @see SSLHandshaker
 * 
 * @author Alexey Stashok
 */
public class BlockingSSLHandshaker implements SSLHandshaker {
    private Logger logger = Grizzly.logger;

    /**
     * {@inheritDoc}
     */
    public Future handshake(
            SSLStreamReader reader,
            SSLStreamWriter writer,
            SSLEngineConfigurator configurator) throws IOException {

        Connection connection = reader.getConnection();
        
        SSLResourcesAccessor resourceAccessor =
                SSLResourcesAccessor.getInstance();
        SSLEngine sslEngine = resourceAccessor.getSSLEngine(connection);

        if (sslEngine == null) {
            sslEngine = configurator.createSSLEngine();
            resourceAccessor.setSSLEngine(connection, sslEngine);
        }

        boolean isLoggingFinest = logger.isLoggable(Level.FINEST);

        if (isLoggingFinest) {
            logger.finest("connection=" + connection + " engine=" + sslEngine +
                    " handshakeStatus=" + sslEngine.getHandshakeStatus());
        }

        HandshakeStatus handshakeStatus = sslEngine.getHandshakeStatus();

        if (handshakeStatus == HandshakeStatus.NOT_HANDSHAKING) {
            sslEngine.beginHandshake();
            handshakeStatus = sslEngine.getHandshakeStatus();
        }

        boolean readerMode = reader.isBlocking();
        boolean writerMode = writer.isBlocking();

        try {
            reader.setBlocking(true);
            writer.setBlocking(true);

            while (handshakeStatus != HandshakeStatus.FINISHED &&
                    handshakeStatus != HandshakeStatus.NOT_HANDSHAKING) {

                if (isLoggingFinest) {
                    logger.finest("Loop Engine: " + sslEngine +
                            " handshakeStatus=" + sslEngine.getHandshakeStatus());
                }

                switch (handshakeStatus) {
                    case NEED_UNWRAP:
                    {
                        if (isLoggingFinest) {
                            logger.finest("NEED_UNWRAP Engine: " + sslEngine);
                        }

                        Future future = reader.handshakeUnwrap(null);
                        future.get(10, TimeUnit.SECONDS);
                        handshakeStatus = sslEngine.getHandshakeStatus();
                        break;
                    }
                    case NEED_WRAP:
                    {
                        if (isLoggingFinest) {
                            logger.finest("NEED_WRAP Engine: " + sslEngine);
                        }

                        Future future = writer.handshakeWrap(null);
                        future.get(10, TimeUnit.SECONDS);
                        handshakeStatus = sslEngine.getHandshakeStatus();
                        break;
                    }
                    case NEED_TASK:
                    {
                        if (isLoggingFinest) {
                            logger.finest("NEED_TASK Engine: " + sslEngine);
                        }
                        SSLUtils.executeDelegatedTask(sslEngine);
                        handshakeStatus = sslEngine.getHandshakeStatus();
                        break;
                    }
                    default:
                    {
                        throw new RuntimeException("Invalid Handshaking State" +
                                handshakeStatus);
                    }
                }
            }
        } catch (Exception e) {
            return new ReadyFutureImpl(e);
        } finally {
            reader.setBlocking(readerMode);
            writer.setBlocking(writerMode);
        }

        return new ReadyFutureImpl(sslEngine);
    }
}