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package com.sun.grizzly.http;

import com.sun.grizzly.DefaultSelectionKeyHandler;
import com.sun.grizzly.SelectionKeyHandler;
import com.sun.grizzly.util.Copyable;
import com.sun.grizzly.util.SelectionKeyAttachment;
import java.nio.channels.SelectionKey;
import java.util.Iterator;

/**
 * Default HTTP {@link SelectionKeyHandler} implementation
 *
 * @author Jean-Francois Arcand
 * @author Alexey Stashok
 */
public class SelectorThreadKeyHandler extends DefaultSelectionKeyHandler {

    private SelectorThread selectorThread;

    public SelectorThreadKeyHandler() {
    }

    public SelectorThreadKeyHandler(SelectorThread selectorThread) {
        this.selectorThread = selectorThread;
    }

    @Override
    public void copyTo(Copyable copy) {
        super.copyTo(copy);
        SelectorThreadKeyHandler copyHandler = (SelectorThreadKeyHandler) copy;
        copyHandler.selectorThread = selectorThread;
    }

    @Override
    public void cancel(SelectionKey key) {
        if (key != null) {
            if (selectorThread.getThreadPool() instanceof StatsThreadPool) {
                if (selectorThread.isMonitoringEnabled() &&
                        ((StatsThreadPool) selectorThread.getThreadPool()).getStatistic().decrementOpenConnectionsCount(key.channel())) {
                    selectorThread.getRequestGroupInfo().decreaseCountOpenConnections();
                }
            }
            super.cancel(key);
        }
    }

    @Override
    public void doRegisterKey(SelectionKey key, int ops, long currentTime) {
        final Object attachment = key.attachment();
        if (attachment != null && attachment.equals(SelectionKeyAttachment.DEREGISTERED)) {
            return;
        }

        if (!key.isValid()) {
            selectorHandler.getSelectionKeyHandler().cancel(key);
        } else {
            key.interestOps(key.interestOps() | ops);
            addExpirationStamp(key, currentTime);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void expire(Iterator iterator) {
        if (timeout == SelectionKeyAttachment.UNLIMITED_TIMEOUT) {
            return;
        }

        final long currentTime = System.currentTimeMillis();
        if (currentTime < nextKeysExpiration) {
            return;
        }

        nextKeysExpiration = currentTime + 1000;
        while (iterator.hasNext()) {
            SelectionKey key = iterator.next();
            if (!key.isValid()) {
                continue;
            }

            Object attachment = key.attachment();
            if (attachment != null) {
                long expire = getExpirationStamp(attachment);

                if (expire >= 0) {
                    long idleLimit = getIdleLimit(attachment);

                    if (idleLimit >= 0 && currentTime - expire >= idleLimit &&
                            (!(attachment instanceof SelectionKeyAttachment) ||
                            ((SelectionKeyAttachment) attachment).timedOut(key))) {
                        //preventing further idle timeout detection for same key
                        //due to we dont directly cancel key anymore we cant
                        //rely in key.isvalid detection
                        addExpirationStamp(key,
                                SelectionKeyAttachment.UNLIMITED_TIMEOUT);
                        cancel(key);
                    }
                }
            }
        }
    }

    /**
     * returns idle limit
     * @param attachment
     * @return
     */
    private long getIdleLimit(Object attachment) {
        if (attachment instanceof SelectionKeyAttachment) {
            long idleLimit = ((SelectionKeyAttachment) attachment).getIdleTimeoutDelay();
            if (idleLimit != SelectionKeyAttachment.UNSET_TIMEOUT) {
                return idleLimit;
            }
        }
        return timeout;
    }
}