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package com.sun.grizzly.cometd.standalone;

import com.sun.grizzly.Controller;
import com.sun.grizzly.comet.CometContext;
import com.sun.grizzly.comet.CometEngine;
import com.sun.grizzly.cometd.BayeuxCometHandler;
import com.sun.grizzly.cometd.CometdNotificationHandler;
import com.sun.grizzly.cometd.CometdRequest;
import com.sun.grizzly.cometd.CometdResponse;
import com.sun.grizzly.cometd.EventRouter;
import com.sun.grizzly.cometd.EventRouterImpl;
import java.io.IOException;

import com.sun.grizzly.tcp.http11.GrizzlyAdapter;
import com.sun.grizzly.tcp.http11.GrizzlyRequest;
import com.sun.grizzly.tcp.http11.GrizzlyResponse;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;

/**
 * Standalone Cometd implementation. This class is used when Cometd is enabled
 * from the Grizzly standalone WebServer. To enable it, just add:
 *
 * -Dcom.sun.grizzly.adapterClass=com.sun.grizzly.cometd.standalone.CometdAdapter
 *
 * @author Jeanfrancois Arcand
 */
public class CometdAdapter extends GrizzlyAdapter {
    
    /**
     * All request to that context-path will be considered as cometd enabled.
     */
    private String contextPath = "/cometd/cometd";
    
    /**
     * The Bayeux {@link CometHandler} implementation.
     */
    private BayeuxCometHandler bayeuxCometHandler;
    
    
    /**
     * The EventRouter used to route JSON message.
     */
    private EventRouter eventRouter;
    
    
    public static final String COMETD_REQUEST = "request";
    
    public static final String COMETD_RESPONSE = "response";
    
    private ReentrantLock initializedLock = new ReentrantLock();
    
    
    public CometdAdapter() {
        super();
        setHandleStaticResources(true);
    }
    
    
    /**
     * Route the request to the cometd implementation. If the request point to
     * a static file, delegate the call to the Grizzly WebServer implementation.
     */
    @Override
    public void service(GrizzlyRequest request, GrizzlyResponse response) {
        try {
            CometEngine cometEngine = CometEngine.getEngine();
            CometContext cometContext = cometEngine.getCometContext(contextPath);

            initializedLock.lock();
            try {
                if (cometContext == null) {
                    cometContext = cometEngine.register(contextPath);
                    cometContext.setExpirationDelay(-1);
                    cometContext.setBlockingNotification(true);
                    cometContext.setNotificationHandler(new CometdNotificationHandler());

                    bayeuxCometHandler = new BayeuxCometHandler();
                    eventRouter = new EventRouterImpl(cometContext);
                    int mainHandlerHash = cometContext.addCometHandler(bayeuxCometHandler, true);
                    cometContext.addAttribute(BayeuxCometHandler.BAYEUX_COMET_HANDLER, mainHandlerHash);
                }
            } finally {
                initializedLock.unlock();
            }

            CometdRequest cometdReq = (CometdRequest) request.getNote(COMETD_REQUEST);
            CometdResponse cometdRes = (CometdResponse) request.getNote(COMETD_RESPONSE);

            if (cometdReq == null) {
                cometdReq = new CometdRequest(request) {

                    public String[] getParameterValues(String s) {
                        return request.getParameterValues(s);
                    }
                };

                cometdRes = new CometdResponse(response) {
                    public void write(String s) throws IOException {
                        response.getWriter().write(s);
                    }

                    public void flush() throws IOException {
                        response.getWriter().flush();
                    }

                    public void setContentType(String s) {
                        response.setContentType(s);
                    }
                };
                request.setNote(COMETD_REQUEST, cometdReq);
                request.setNote(COMETD_RESPONSE, cometdRes);
            }

            eventRouter.route(cometdReq, cometdRes);
        } catch (IOException ex) {
            Controller.logger().log(Level.SEVERE,"CometdAdapter exception", ex);
        }
    }
 
    /**
     * Return the comet context path used by this Adapter. By default, it return
     * "/cometd"
     */
    public String getContextPath() {
        return contextPath;
    }

    
    /**
     * Set the comet context path.
     */
    public void setContextPath(String contextPath) {
        this.contextPath = contextPath;
    }
}