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package com.pdd.pop.ext.glassfish.grizzly.strategies;

import java.io.IOException;
import java.util.concurrent.Executor;
import java.util.logging.Logger;

import com.pdd.pop.ext.glassfish.grizzly.Connection;
import com.pdd.pop.ext.glassfish.grizzly.Context;
import com.pdd.pop.ext.glassfish.grizzly.Grizzly;
import com.pdd.pop.ext.glassfish.grizzly.IOEvent;
import com.pdd.pop.ext.glassfish.grizzly.IOEventLifeCycleListener;
import com.pdd.pop.ext.glassfish.grizzly.Transport;
import com.pdd.pop.ext.glassfish.grizzly.asyncqueue.AsyncQueue;
import com.pdd.pop.ext.glassfish.grizzly.threadpool.ThreadPoolConfig;

/**
 * {@link com.pdd.pop.ext.glassfish.grizzly.IOStrategy}, which executes {@link com.pdd.pop.ext.glassfish.grizzly.Processor}s in a current thread.
 *
 * @author Alexey Stashok
 */
public final class SameThreadIOStrategy extends AbstractIOStrategy {

    private static final SameThreadIOStrategy INSTANCE = new SameThreadIOStrategy();

    private static final Logger logger = Grizzly.logger(SameThreadIOStrategy.class);


    private static final InterestLifeCycleListenerWhenIoEnabled LIFECYCLE_LISTENER_WHEN_IO_ENABLED =
            new InterestLifeCycleListenerWhenIoEnabled();

    private static final InterestLifeCycleListenerWhenIoDisabled LIFECYCLE_LISTENER_WHEN_IO_DISABLED =
            new InterestLifeCycleListenerWhenIoDisabled();
    
    // ------------------------------------------------------------ Constructors


    private SameThreadIOStrategy() { }


    // ---------------------------------------------------------- Public Methods


    public static SameThreadIOStrategy getInstance() {
        return INSTANCE;
    }


    // ------------------------------------------------- Methods from IOStrategy


    @Override
    public boolean executeIoEvent(final Connection connection,
            final IOEvent ioEvent, final boolean isIoEventEnabled)
            throws IOException {
        
        IOEventLifeCycleListener listener = null;
        if (isReadWrite(ioEvent)) {
            listener = isIoEventEnabled
                    ? LIFECYCLE_LISTENER_WHEN_IO_ENABLED
                    : LIFECYCLE_LISTENER_WHEN_IO_DISABLED;
        }

        fireIOEvent(connection, ioEvent, listener, logger);

        return true;
    }

    @Override
    public Executor getThreadPoolFor(final Connection connection,
            final IOEvent ioEvent) {
        return null;
    }

    // ----------------------------------- Methods from WorkerThreadPoolConfigProducer


    @Override
    public ThreadPoolConfig createDefaultWorkerPoolConfig(final Transport transport) {
        return null;
    }

    // ---------------------------------------------------------- Nested Classes


    private static final class InterestLifeCycleListenerWhenIoEnabled
            extends IOEventLifeCycleListener.Adapter {

        @Override
        public void onReregister(final Context context) throws IOException {
            onComplete(context, null);
        }

        @Override
        public void onComplete(final Context context, final Object data) throws IOException {
            if (context.wasSuspended() || context.isManualIOEventControl()) {
                final IOEvent ioEvent = context.getIoEvent();
                final Connection connection = context.getConnection();
                
                if (AsyncQueue.EXPECTING_MORE_OPTION.equals(data)) {
                    connection.simulateIOEvent(ioEvent);
                } else {
                    connection.enableIOEvent(ioEvent);
                }
            }
        }

        @Override
        public void onContextSuspend(final Context context) throws IOException {
            // check manual io event control, to not disable ioevent twice
            if (!context.wasSuspended() && !context.isManualIOEventControl()) {
                disableIOEvent(context);
            }
        }

        @Override
        public void onContextManualIOEventControl(final Context context)
                throws IOException {
            // check suspended mode, to not disable ioevent twice
            if (!context.wasSuspended() && !context.isManualIOEventControl()) {
                disableIOEvent(context);
            }
        }

        private static void disableIOEvent(final Context context)
                throws IOException {
            final Connection connection = context.getConnection();
            final IOEvent ioEvent = context.getIoEvent();
            connection.disableIOEvent(ioEvent);
        }

    }
    
    private static final class InterestLifeCycleListenerWhenIoDisabled
            extends IOEventLifeCycleListener.Adapter {

        @Override
        public void onReregister(final Context context) throws IOException {
            onComplete(context, null);
        }

        @Override
        public void onComplete(final Context context, final Object data)
                throws IOException {
            
            final IOEvent ioEvent = context.getIoEvent();
            final Connection connection = context.getConnection();
            if (AsyncQueue.EXPECTING_MORE_OPTION.equals(data)) {
                connection.simulateIOEvent(ioEvent);
            } else {
                connection.enableIOEvent(ioEvent);
            }
        }
    }    
}