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    /*
 * File: $HeadURL$
 * Id  : $Id$
 * 
 * created by: Tom, Thomas Schneider
 * created on: 11.10.2013
 * 
 * Copyright: (c) Thomas Schneider 2013, all rights reserved
 */
package de.tsl2.nano.h5;

import static de.tsl2.nano.bean.def.BeanPresentationHelper.KEY_FILTER_FROM_LABEL;
import static de.tsl2.nano.bean.def.BeanPresentationHelper.KEY_FILTER_TO_LABEL;
import static de.tsl2.nano.bean.def.IBeanCollector.MODE_CREATABLE;
import static de.tsl2.nano.bean.def.IBeanCollector.MODE_EDITABLE;
import static de.tsl2.nano.bean.def.IBeanCollector.MODE_SEARCHABLE;
import static de.tsl2.nano.h5.HtmlUtil.BTN_ASSIGN;
import static de.tsl2.nano.h5.HtmlUtil.BTN_CANCEL;
import static de.tsl2.nano.h5.HtmlUtil.BTN_SUBMIT;
import static de.tsl2.nano.h5.HtmlUtil.beanID;
import static de.tsl2.nano.h5.NanoH5.OFFSET_FILTERLINES;
import static de.tsl2.nano.h5.NanoHTTPD.MIME_HTML;

import java.io.File;
import java.io.Serializable;
import java.lang.Thread.UncaughtExceptionHandler;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;

import javax.net.ssl.SSLContext;

import org.apache.commons.logging.Log;
import org.java_websocket.server.DefaultSSLWebSocketServerFactory;

import de.tsl2.nano.action.IAction;
import de.tsl2.nano.bean.BeanContainer;
import de.tsl2.nano.bean.BeanUtil;
import de.tsl2.nano.bean.Context;
import de.tsl2.nano.bean.def.Bean;
import de.tsl2.nano.bean.def.BeanCollector;
import de.tsl2.nano.bean.def.BeanDefinition;
import de.tsl2.nano.bean.def.BeanModifier;
import de.tsl2.nano.bean.def.BeanPresentationHelper;
import de.tsl2.nano.bean.def.BeanValue;
import de.tsl2.nano.bean.def.IBeanCollector;
import de.tsl2.nano.bean.def.IBeanFinder;
import de.tsl2.nano.bean.def.IPageBuilder;
import de.tsl2.nano.bean.def.IPresentable;
import de.tsl2.nano.bean.def.MethodAction;
import de.tsl2.nano.collection.CollectionUtil;
import de.tsl2.nano.collection.MapEntrySet;
import de.tsl2.nano.core.ENV;
import de.tsl2.nano.core.ISession;
import de.tsl2.nano.core.Main;
import de.tsl2.nano.core.ManagedException;
import de.tsl2.nano.core.exception.ExceptionHandler;
import de.tsl2.nano.core.exception.Message;
import de.tsl2.nano.core.execution.Profiler;
import de.tsl2.nano.core.log.LogFactory;
import de.tsl2.nano.core.messaging.EMessage;
import de.tsl2.nano.core.messaging.IListener;
import de.tsl2.nano.core.secure.Crypt;
import de.tsl2.nano.core.secure.PKI;
import de.tsl2.nano.core.util.ConcurrentUtil;
import de.tsl2.nano.core.util.DateUtil;
import de.tsl2.nano.core.util.FileUtil;
import de.tsl2.nano.core.util.ListSet;
import de.tsl2.nano.core.util.MapUtil;
import de.tsl2.nano.core.util.NetUtil;
import de.tsl2.nano.core.util.NumberUtil;
import de.tsl2.nano.core.util.ObjectUtil;
import de.tsl2.nano.core.util.StringUtil;
import de.tsl2.nano.core.util.Util;
import de.tsl2.nano.h5.NanoHTTPD.Method;
import de.tsl2.nano.h5.NanoHTTPD.Response;
import de.tsl2.nano.h5.NanoHTTPD.Response.Status;
import de.tsl2.nano.h5.collector.Controller;
import de.tsl2.nano.h5.configuration.BeanConfigurator;
import de.tsl2.nano.h5.navigation.EntityBrowser;
import de.tsl2.nano.h5.navigation.IBeanNavigator;
import de.tsl2.nano.h5.navigation.Parameter;
import de.tsl2.nano.h5.navigation.Workflow;
import de.tsl2.nano.h5.plugin.INanoPlugin;
import de.tsl2.nano.h5.websocket.NanoWebSocketServer;
import de.tsl2.nano.h5.websocket.WebSocketExceptionHandler;
import de.tsl2.nano.h5.websocket.chat.ChatMessage;
import de.tsl2.nano.persistence.Persistence;
import de.tsl2.nano.plugin.Plugins;
import de.tsl2.nano.service.util.BeanContainerUtil;
import de.tsl2.nano.serviceaccess.Authorization;
import de.tsl2.nano.serviceaccess.IAuthorization;
import de.tsl2.nano.util.XmlGenUtil;
import de.tsl2.nano.util.operation.IRange;

/**
 * user session for nano.h5 server
 * 
 * @author Tom, Thomas Schneider
 * @version $Revision$
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public class NanoH5Session extends BeanModifier implements ISession, Serializable, IListener {
    /** serialVersionUID */
    private static final long serialVersionUID = -8299446546343086394L;

    private static final Log LOG = LogFactory.getLog(NanoH5Session.class);

    transient String id;
    transient NanoH5 server;
    transient IPageBuilder builder;
    /** workflow or bean navigator */
    transient IBeanNavigator nav;
    /** html response */
    transient Response response;
    /** concatencation of database-name+schema+beans.jar */
    Context context;

    /** sessions classloader */
    transient ClassLoader sessionClassloader;
    /** requests user internet adress */
    transient InetAddress inetAddress;

    /** port of websocket, if used */
    transient int websocketPort;

    /** sessions exceptionHandler */
    transient ExceptionHandler exceptionHandler;

    /** logs all user actions to be given on error-handling */
    transient List actionLog;

    /** for profiling in status-line (current work-time of last request) */
    transient long startTime;

    /** session start */
    private long sessionStart;

    /** session access */
    private long lastAccess = System.currentTimeMillis();
    transient int requests;

    transient private IAuthorization authorization;
    transient private BeanContainer beanContainer;
    transient private BeanConfigurator beanConfigurator;

    /** workaround if nano sends the same page twice */
    boolean cacheReloaded;

    private String key;

    private WebSecurity webSec = new WebSecurity();

    private String requestId;
    
    public static final String PREFIX_STATUS_LINE = "@";

    public static final String PREFIX_CONTEXT_RANGE = "range:";

//    public static final String KEY_WEBSOCKET_PORT = "websocket.port";

    public static final NanoH5Session createSession(NanoH5 server,
            InetAddress inetAddress,
            IBeanNavigator navigator,
            ClassLoader appstartClassloader,
            IAuthorization authorization,
            Map context) {
        //TODO: respect the bean-set (bean-jar-file!)
        File storedSessionFile = getSessionFile(authorization);
        NanoH5Session session = null;
        if (storedSessionFile != null && storedSessionFile.exists()) {
            try {
                //try to load a temp stored session
                session = ENV.get(XmlGenUtil.class).loadXml(storedSessionFile.getPath(), NanoH5Session.class);
                session.init(server, inetAddress, navigator, appstartClassloader, authorization, context);
            } catch (Exception e) {
                //on error we create a new session object
                LOG.error(e);
            }
        }
        if (session == null) {
            session = new NanoH5Session(server, inetAddress, navigator, appstartClassloader, authorization, context);
        }
        return session;
    }

    private static File getSessionFile(IAuthorization authorization) {
        return authorization != null ? new File(ENV.getTempPathRel() + "session-" + authorization.getUser()) : null;
    }

    /**
     * constructor
     * 
     * @param server
     * @param inetAddress
     * @param navigation
     * @param appstartClassloader
     * @param authorization
     */
    protected NanoH5Session(NanoH5 server,
            InetAddress inetAddress,
            IBeanNavigator navigator,
            ClassLoader appstartClassloader,
            IAuthorization authorization,
            Map context) {
        super();
        init(server, inetAddress, navigator, appstartClassloader, authorization, context);
    }

    /**
     * init
     * 
     * @param server
     * @param inetAddress
     * @param navigator
     * @param appstartClassloader
     * @param authorization
     * @param context
     */
    protected void init(NanoH5 server,
            InetAddress inetAddress,
            IBeanNavigator navigator,
            ClassLoader appstartClassloader,
            IAuthorization authorization,
            Map context) {
        this.server = server;
        this.server.getEventController().addListener(this);
        this.server.getEventController().addListener((IListener)this, ChatMessage.class);
        this.inetAddress = inetAddress;
        this.builder = server.builder;
        this.nav = navigator;
        this.sessionClassloader = appstartClassloader;
        createExceptionHandler();
        this.actionLog = new LinkedList<>();
        this.authorization = authorization;
        initContext(authorization, context);
        this.sessionStart = System.currentTimeMillis();
        Persistence p = Persistence.current(); //only for id-creation
        this.id = inetAddress + p.getConnectionUrl() + "&" + p.getConnectionUserName() + "&" + p.getJarFile() + "&" + sessionStart;
    }

    /**
     * initContext
     * 
     * @param authorization
     * @param context
     */
    void initContext(IAuthorization authorization, Map context) {
        this.context = Context.create(authorization != null ? authorization.getUser().toString() : null, true);
        this.context.putAll(context);
    }

    /**
     * injectFromContext
     * 
     * @param beandefs
     * @param type
     * @param range
     * @param i
     */
    BeanDefinition injectContext(BeanDefinition beandef) {
        //inject search filter only on first time - before first search...
        if (beandef != null && beandef.isMultiValue() && beandef instanceof BeanCollector && !((BeanCollector) beandef).wasActivated()) {
            //fill search parameters...
            Iterator ranges = this.context.get(IRange.class);
            Class type;
            IRange range = null;
            while (ranges.hasNext()) {
                range = ranges.next();
                type = range.getFrom() != null ? range.getFrom().getClass() : null;
                IBeanFinder beanFinder;
                if (beandef.getDeclaringClass().equals(type)) {
                    beanFinder = ((BeanCollector) beandef).getBeanFinder();
                    if (beanFinder != null) {
                        Bean brange = beanFinder.getFilterRange();
                        brange.getAttribute("from").setValue(BeanContainer.attachEntities(range.getFrom()));
                        brange.getAttribute("to").setValue(BeanContainer.attachEntities(range.getTo()));
                        break;
                    }
                }
            }
        }
        return beandef;
    }

    /**
     * createExceptionHandler
     */
    private void createExceptionHandler() {
        if (ENV.get("websocket.use", true)) {
            NanoWebSocketServer socketServer = createWebSocketServer(
                ENV.get("app.ssl.keystore.file", "nanoh5.pks"), 
                ENV.get("app.ssl.keystore.password", "nanoh5"));
            this.exceptionHandler =
                (ExceptionHandler) ENV.addService(UncaughtExceptionHandler.class,
                    new WebSocketExceptionHandler(socketServer));
            socketServer.start();

        } else {
            this.exceptionHandler =
                (ExceptionHandler) ENV.addService(UncaughtExceptionHandler.class, new ExceptionHandler());
        }
        Thread.currentThread().setUncaughtExceptionHandler(exceptionHandler);
        ConcurrentUtil.setCurrent(exceptionHandler);
    }

    private NanoWebSocketServer createWebSocketServer(String keystoreName, String password) {
        final NanoWebSocketServer socketServer =
            new NanoWebSocketServer(this, createSocketAddress());
        if (ENV.get("app.ssl.activate", false)) {
            try {
                SSLContext sslContext = SSLContext.getInstance(ENV.get("app.ssl.wss.protocol", "TLSv1.2"));//SSLv3
                KeyStore keyStore = PKI.createKeyStore(KeyStore.getDefaultType(), keystoreName, password.toCharArray());
                sslContext.init(PKI.getKeyManagerFactory(keyStore, password).getKeyManagers(), null, null);
                socketServer.setWebSocketFactory(new DefaultSSLWebSocketServerFactory(sslContext));
            } catch (NoSuchAlgorithmException | KeyManagementException e) {
                //Don't stop the application, if websocket fails!
                LOG.error(e);
            }
        }
        websocketPort = socketServer.getPort();
        return socketServer;
    }

    private InetSocketAddress createSocketAddress() {
        URL url = NanoH5.getServiceURL(null);
        //workaround - see doc of NetUtil.getFreePort()
        return new InetSocketAddress(url.getHost(), NetUtil.getFreePort());
    }

    /**
     * setAuthorization
     * 
     * @param authorization
     */
    @Override
    public void setUserAuthorization(Object authorization) {
        this.authorization = (IAuthorization) authorization;
        initContext((IAuthorization) authorization, context);

        // <-- out-comment: we use the session-id on first request!
        // server.sessions.remove(inetAddress, this);
        // server.sessions.put(getKey(), this);
    }

    void setBeanContainer(BeanContainer beanContainer) {
        this.beanContainer = beanContainer;
    }

    /**
     * main session serve method. requests of type 'GET' and file-links are handled by the application class (NanoH5).
     * 
     * @param uri url, name of a bean, or number of selected item in a beancollector
     * @param method 'POST'
     * @param header request header
     * @param parms request
     * @param files
     * @return html response
     */
    public Response serve(String uri,
            String method,
            Map header,
            Map parms,
            Map files) {
        String msg = "No Usersession available - Please log in again!";
        ManagedException ex = null;
        try {
            logRequest(uri, method, header, parms, files);
            cacheReloaded = false;
            webSec.checkSession(this, method, header, parms);
            //refresh session values on the current thread
            assignSessionToCurrentThread(true, MapUtil.filter(header, "User-Agent"));

            //WORKAROUND for uri-problem
            String referer = header.get("referer");
            if (parms.containsKey(IAction.CANCELED)
                || (method.equals("POST") && referer != null && uri.length() > 1 && referer.contains(uri))) {
                uri = "/";
            }
            //extract bean-specific prefix
            BeanDefinition linkToModel = getUserAuthorization() != null ? nav.fromUrl(uri) : null;
            Object userResponse = null;
            /*
             * uri:
             * - file-system links is already handled in parent class.
             * - direct link to another page/bean
             * - selection-link-number in beancollector
             * - bean action of Html5PresentationHelper
             */
            Number uriLinkNumber = linkToModel != null 
                ? null 
                : getUserAuthorization() != null 
                    ? NumberUtil.extractNumber(uri.substring(1)) 
                    : null;
            //form-button clicked - or first page
            if (!parms.isEmpty() || linkToModel != null || uriLinkNumber != null || response == null
                || uri.contains(Html5Presentation.PREFIX_BEANREQUEST)) {
                if (linkToModel != null) {
                    userResponse = linkToModel;
                } else {
                    userResponse = processInput(uri, parms, uriLinkNumber);
                }
                Message.send("trying to load response " + userResponse);
                if (userResponse instanceof String && !userResponse.equals(IAction.CANCELED)) {
                    msg = (String) userResponse;
                    if (HtmlUtil.isURI(msg)) {
                        return server.serve(msg, Method.GET, header, parms, files);
                    } else if (!HtmlUtil.containsHtml(msg)) {
                        msg = HtmlUtil.createMessagePage(ENV.translate("tsl2nano.info", true), msg);
                    }
                } else {
//                    if (!exceptionHandler.hasExceptions()) {
//                    }
                    msg = getNextPage(userResponse);
                }
                response = server.createResponse(msg);
            } else {
                close();
                return webSec.addSessionHeader(this, server.createResponse(Html5Presentation.createMessagePage("start.template",
                    ENV.getName() + "
    " + "Restart Session", server.serviceURL)));
            }
        } catch (Throwable e /*respect errors like NoClassDefFound...the application should continue!*/) {
            LOG.error(e);
            if (nav == null) // -> session closed
            	return server.createResponse(Status.NOT_FOUND, MIME_HTML, e.getLocalizedMessage() != null ? e.getLocalizedMessage() : "Please login again!");
            ex = new ManagedException(e) {
                /** serialVersionUID */
                private static final long serialVersionUID = 1L;

                @Override
                public String getMessage() {
                    if (ENV.get("app.login.secure", false))
                        return super.getMessage();
                    else
                        return super.getMessage() + "\n\nAction-Stack:\n"
                            + StringUtil.toFormattedString(actionLog, 1000, true);
                }
            };
            Plugins.process(INanoPlugin.class).exceptionHandler(ex);
            if (nav.current() != null)
                msg = refreshPage(ex);
            String user = getUserAuthorization() != null ? (String)getUserAuthorization().getUser() : "unauthorized";
            try {// only a try, don't throw a new exception in this catch block
                FileUtil.writeBytes(msg.getBytes(), ENV.getTempPath() + "page-failed-" 
                        + "-" + DateUtil.getFormattedTimeStamp() + ".html", false);
            } catch (Exception e1) {
                LOG.error(e1);
            }
            response = server.createResponse(Status.BAD_REQUEST, MIME_HTML, msg);
            actionLog.clear();
            //don't forget that there was an exception. to be seen on the next exception ;-)
            logaction(ex.toString(), parms);
            EMessage.broadcast(this,
                ENV.translate("nanoh5.error", false,
                    user, 
                    nav.current() != null ? nav.current() : "UNDEFINED", ex.getLocalizedMessage()),
                "*");
        }
        //TODO: eliminate bug in NanoHTTPD not resetting uri...
//        header.clear();
//        response.header.remove(uri);
        Message.send(exceptionHandler, createStatusText(startTime));
        if (ex != null)
            Message.send(exceptionHandler, ex.toString());
        webSec.addSessionHeader(this, response);
        return Plugins.process(INanoPlugin.class).handleResponse(response);
    }

	private void logRequest(String uri, String method, Map header, Map parms,
			Map files) {
		if (LOG.isDebugEnabled()) {
		    LOG.debug(
		        String.format("serving request:\n\turi: %s\n\tmethod: %s\n\theader: %s\n\tparms: %s\n\tfiles: %s",
		            uri,
		            method,
		            header,
		            parms,
		            files));
		} else {
		    LOG.info(String.format("serving request " + requests + " : uri: %s, method: %s, %s, parms: %s",
		        uri,
		        method,
		        MapUtil.filter(header, "http-client-ip", "User-Agent"),
		        parms));
		}
	}

    public String createAntiCSRFToken() {
    	return webSec.createAntiCSRFToken(this);
    }
    /**
     * assignSessionToCurrentThread
     */
    public void assignSessionToCurrentThread(boolean newRequest, Map properties) {
        if (newRequest) {
            lastAccess = System.currentTimeMillis();
            requests++;
            if (nav != null && nav.current() instanceof Bean && ((Bean) nav.current()).getInstance() instanceof BeanConfigurator) {
                this.beanConfigurator = (BeanConfigurator) ((Bean) nav.current()).getInstance();
            }
            if (properties != null && !properties.isEmpty()) {
                ConcurrentUtil.setCurrent(properties);
            }
        }
        Thread.currentThread().setContextClassLoader(sessionClassloader);
        Thread.currentThread().setUncaughtExceptionHandler(exceptionHandler);
        ConcurrentUtil.setCurrent(getUserAuthorization(), beanContainer, beanConfigurator, nav, context);
    }

    /**
     * isMobile
     * @return true, if client request comes from mobile device
     */
    public boolean isMobile() {
        Map props = ConcurrentUtil.getCurrent(Map.class);
        if (props == null)
            return false;
        Object userAgent = props.get("User-Agent");
        return userAgent != null && userAgent.toString().contains("Mobile");
    }
    
    /**
     * defines, which values have to be provided to the current thread. each thread lives only for one request! this is
     * needed because the app instance provides most of this values and is open for all sessions.
     * 
     * @return types to be provided to the current thread
     */
    static final Class[] getThreadLocalTypes() {
        return new Class[] { BeanContainer.class, Authorization.class, BeanConfigurator.class, ExceptionHandler.class, 
        		Context.class, EntityBrowser.class, Workflow.class };
    }

    @Override
    public void close() {
        LOG.debug("closing session " + this);
        server.removeSession(this);
        nav = null;
        response = null;
        authorization = null;
        beanContainer = null;
        builder = null;
        if (sessionClassloader instanceof URLClassLoader) {
        	if (!sessionClassloader.equals(server.appstartClassloader)) {
	        	Util.trY(() -> ((URLClassLoader)sessionClassloader).close());
	        	if (Thread.currentThread().getContextClassLoader().equals(sessionClassloader))
	        		Thread.currentThread().setContextClassLoader(server.appstartClassloader);
        	}
        }
        sessionClassloader = null;
        if (exceptionHandler instanceof WebSocketExceptionHandler) {
            Util.trY(() -> ((WebSocketExceptionHandler) exceptionHandler).close());
        }
        exceptionHandler = null;
        context = null;
        ConcurrentUtil.removeCurrent(getThreadLocalTypes());
//        server = null;
    }

    String createStatusText(long startTime) {
        String user =
            authorization != null ? ENV.translate("tsl2nano.login.user", true) + ": "
                + authorization.getUser() + "§"
                + StringUtil.toHexString((getUserAuthorization() + "\n" + "RequestID: " + requests).getBytes())
                + ", " + "Online: "
                + DateUtil.getFormattedMinutes(getDuration()) + " min, " : "";
        String workflow = /*nav instanceof Workflow 
        		? "" + ENV.translate(nav.getName(), true) + ""
        			: */nav != null ? ENV.translate(nav.getName(), true) : "unknown";
        return PREFIX_STATUS_LINE + user
            + ENV.translate("tsl2nano.time", true)
            + ": " + DateUtil.getFormattedTime(new Date()) + ", "
            + (nav != null ? ENV.translate("tsl2nano.session", true)
                + ": " + workflow + "§"
                + StringUtil.toHexString(getContext().toString().getBytes()) : "")
            + ", "
            + ENV.translate("tsl2nano.request", true) + ": "
            + (int)DateUtil.seconds(System.currentTimeMillis() - startTime) + " sec "
            + (int)(response.getContentLength() / 1024) + " KB"
            + (LOG.isDebugEnabled() ? ", " + "Memory: " + (Profiler.getUsedMem() / (1024 * 1024)) + " MB" : "")
            + (LOG.isDebugEnabled() ? ", " + "working sessions: " + server.sessions.size() : "");
    }

    private String refreshPage(Object message) {
        try {
            return builder.build(this, nav.current(), message, true, nav.toArray());
        } catch (Exception e) {
            LOG.error(e);
            return message.toString();
        }
    }

    /**
     * pops the next model from navigation stack (see {@link #getNextModel(Object)} and asks the pagebuilder to create a
     * full html page for the given model.
     * 
     * @param returnCode return code of last request
     * @return html string
     */
    private String getNextPage(Object returnCode) {
        String msg = "";
        if (exceptionHandler.hasExceptions()) {
            msg = StringUtil.toFormattedString(exceptionHandler.clearExceptions(), 200, false);
        }
        if (returnCode instanceof BeanCollector) {
        	BeanCollector collector = (BeanCollector) returnCode;
    		Map preAdjustContext = collector.preAdjustContext(getContext());
        	if (preAdjustContext != null) {
        		nav.add(collector);
        		returnCode = preAdjustContext;
        	}
        }
        BeanDefinition model = injectContext(nav.next(returnCode));
        if (model != null)
            model.onActivation(getContextParameter());
        return model != null ? builder.build(this, model, msg, true, nav.toArray()) : server.createStartPage();
    }

    /**
     * process user input
     * 
     * @param uri page uri
     * @param parms response parameter
     * @param uriLinkNumber if navigator.current() is a bean-collector, it is the selected element number
     * @return user response object. may be {@link IAction#CANCELED} any saved or selected object or null.
     */
    private Object processInput(String uri, Map parms, Number uriLinkNumber) {
//        if (parms.containsKey(PageBuilder.COMMAND_RESTART)) {
//            stop();
//            main(null);
//        }
        unescape(parms);
        convertIDs(parms);
        Object responseObject = null;
        if (parms.containsKey(IAction.CANCELED)) {
            logaction(IAction.CANCELED, null);
            if (nav.current() != null) {
                ((BeanDefinition) nav.current()).onDeactivation(getContextParameter());

                //perhaps remove configuration bean
                BeanConfigurator configurator = ConcurrentUtil.getCurrent(BeanConfigurator.class);
                if (configurator != null
                    && ((BeanDefinition) nav.current()).getDeclaringClass().equals(BeanConfigurator.class)) {
                    ConcurrentUtil.removeCurrent(BeanConfigurator.class);
                }
            }
            return IAction.CANCELED;
        }

        // if (isSubmitAssign(parms, true)) // - with this constraint, the current input is lost on going to sub items
            refreshValues(nav.current(), parms);
        
        requestId = createRequestID();
        
        Plugins.process(INanoPlugin.class).handleSessionRequest(this, parms);
        
        if (nav.current() instanceof Controller) {
            Controller ctrl = (Controller) nav.current();
            Set keys = parms.keySet();
            for (String k : keys) {
                if (k != null && k.startsWith(Controller.PREFIX_CTRLACTION)) {
                    return ctrl.doAction(k, getContextParameter());
                }
            }
        }
        //follow links or fill selected items
        if (nav.current() instanceof BeanCollector) {
            BeanCollector collector = (BeanCollector) nav.current();
            //follow given link
            if (uriLinkNumber != null) {
                Collection data = collector.getCurrentData();
                if (data.isEmpty() && !ENV.get("app.mode.strict", false)) {
                    if (ENV.get("session.onemptycollector.create.newitem", true)) {
                        Message.send("navigation error: empty collector -> creating new item...");
                    } else {
                        Message.send("navigation error: empty collector -> going back to " + nav.current());
                        return nav.current();
                    }
                } else {
                    ListSet listSet = CollectionUtil.asListSet(data);
                    int selectedIndex = uriLinkNumber.intValue()
                        - (!collector.isSimpleList() && ENV.get("layout.grid.searchrow.show", true) && collector.hasMode(MODE_SEARCHABLE)
                            && collector.hasFilter() ? 2 : 0);
                    Object selectedItem = listSet.get(selectedIndex);
                    boolean isTypeList = BeanCollector.class.isAssignableFrom(collector.getClazz());
                    responseObject = isTypeList ? selectedItem : Bean.getBean(selectedItem);
                }
            } else {
                if (!isCanceled(parms)
                    && (/*isNewAction(parms, (BeanCollector) nav.current()) || */provideSelection(
                        (BeanCollector) nav.current(), parms))) {
                    if (isReturn(parms)) {
                        responseObject = null;
                    } else if (isOpenAction(parms, (BeanCollector) nav.current())) {
                        //normally, after a selection the navigation object will be hold on stack
                        if (ENV.get("app.edit.multiple", true)) {
                            responseObject = putSelectionOnStack((BeanCollector) nav.current());
                        } else {
                            responseObject = nav.current();
                        }
                    }
                }
            }
            setNavigationGimmicks(responseObject, parms);
        } else if (nav.current() instanceof Bean) {//detail bean
            //on database models with composite-ids, these ids should be synchronized with standard values.
            Bean bean = (Bean) nav.current();
            if (bean.isPersistable()) {
                BeanContainerUtil.synchronizeEmbeddedCompositeID(bean.getInstance());
            }
        }
        //collect available actions
        if (nav.current() != null) {
            responseObject = performAction(uri, nav.current(), parms, responseObject);
        }
        return responseObject;
    }

    private String createRequestID() {
        return Crypt.hashHex("" + new Random().nextDouble() + System.currentTimeMillis());
    }

    private IAction setNavigationGimmicks(Object responseObject, Map parms) {
        BeanCollector collector;
        IAction action = null;
        if (responseObject instanceof BeanCollector) {
            collector = (BeanCollector) responseObject;
            if (collector.hasMode(MODE_CREATABLE) && collector.getActionByName(BeanCollector.ACTION_NEW).isEnabled()) {
                if (collector.getCurrentData().isEmpty() && collector.doAutomaticSearch() && ENV.get("session.navigation.gimmick.onemptycollector.create.newitem", true)) {
                    if (collector.getCurrentData().isEmpty()) {
                        Message.send("empty collector -> creating new item...");
                        action = collector.getActionByName(BeanCollector.ACTION_NEW);
                        parms.put(action.getId(), "");
                    }
                }
            } else if (collector.hasMode(MODE_EDITABLE) && collector.getActionByName(BeanCollector.ACTION_OPEN).isEnabled()) {
                if (collector.getCurrentData().size() == 1 && ENV.get("session.navigation.gimmick.ononeitemincollector.select.first", false)) {
                    Message.send("collector with one item-> select that item...");
                    action = collector.getActionByName(BeanCollector.ACTION_OPEN);
                    parms.put(action.getId(), "");
                }
            }
        }
        return action;
    }

    /**
     * performAction
     * @param uri
     * @param current 
     * @param parms
     * @param responseObject
     * @return
     */
    Object performAction(String uri, BeanDefinition current, Map parms, Object responseObject) {
        Collection actions = evaluateActionsFor(current);
        Collection responseObjectActions = responseObject instanceof BeanDefinition ? evaluateActionsFor((BeanDefinition) responseObject) : null;
        //start the actions
        //respect action-call through menu-link (with method GET but starting with '!!!'
        Set keySet = new HashSet();
        if (uri.contains(Html5Presentation.PREFIX_ACTION)) {
            keySet.add(StringUtil.substring(uri, Html5Presentation.PREFIX_ACTION, null));
        }
        keySet.addAll(parms.keySet());
        for (Object k : keySet) {
            String p = (String) k;
            IAction action = getAction(actions, p);
            if (action != null) {
                ManagedException.assertion(action.isEnabled(), "action " + action.getShortDescription() + " is not enabled!");
                responseObject = performStandardAction(action, current, parms, responseObject);
                break;
            } else {
                if (p.endsWith(IPresentable.POSTFIX_SELECTOR)) {
                    logaction(p, null);
                    String n = StringUtil.substring(p, null, IPresentable.POSTFIX_SELECTOR);
                    final BeanValue assignableAttribute = (BeanValue) current.getAttribute(n);
                    ManagedException.assertion(assignableAttribute.isSelectable(), "attribute " + assignableAttribute + " is not selectable!");
                    responseObject = assignableAttribute.connectToSelector(current);
                    Message.send("open selection panel " + n + " ...");
                    action = setNavigationGimmicks(responseObject, parms);
                    if (action != null) {
                        ManagedException.assertion(action.isEnabled(), "action " + action.getShortDescription() + " is not enabled!");
                        responseObject = performStandardAction(action, (BeanDefinition) responseObject, parms, null);
                    }
                    break;
                } else {
                    //try it on the responseObject...
                    if (responseObjectActions != null) {//see navigation gimmicks
                        action = getAction(responseObjectActions, p);
                        if (action != null) {
                            ManagedException.assertion(action.isEnabled(), "action " + action.getShortDescription() + " is not enabled!");
                            responseObject = performStandardAction(action, (BeanDefinition) responseObject, parms, null);
                            break;
                        }
                    } else {//-> OK, it's no action...
//                        String msg;
//                        LOG.error(msg = "action with id " + p + " not found in beancollector " );
//                        Message.send(msg);
//                        if (ENV.get("app.mode.strict", false))
//                            throw new ManagedException(msg);
                    }
                }
            }
        }
        return responseObject;
    }

    private Collection evaluateActionsFor(BeanDefinition current) {
        Collection actions;
        actions = new ArrayList();
        if (current.getActions() != null) {
            actions.addAll(current.getActions());
        }
        actions.addAll(current.getPresentationHelper().getPageActions(this));
        actions.addAll(current.getPresentationHelper().getSessionActions(this));
        actions.addAll(current.getPresentationHelper().getApplicationActions(this));
        if (current.isMultiValue() && current instanceof BeanCollector) {
            actions.addAll(((BeanCollector) current).getColumnSortingActions());
            actions.add(((BeanCollector) current).getQuickSearchAction());
        }
        return actions;
    }

    private Object performStandardAction(IAction action,
            BeanDefinition current,
            Map parms,
            Object responseObject) {

        logaction(action, parms);
        Plugins.process(INanoPlugin.class).actionBeforeHandler(action);
        //send this information to the client to show a progress bar.
        Message.send("submit");
        Message.send(ENV.translate("tsl2nano.starting", true) + " "
            + action.getShortDescription() + " ...");
        if (current.isMultiValue() && action.getId().endsWith(BeanCollector.POSTFIX_QUICKSEARCH)) {
            action.setParameter(parms.get(Html5Presentation.ID_QUICKSEARCH_FIELD));
            responseObject = action.activate();
        } else if (current.isMultiValue() && current instanceof BeanCollector
            && isSearchRequest(action.getId(), (BeanCollector) current)) {
            responseObject = processSearchRequest(parms, (BeanCollector) current);
        } else {
            /*
             * submit/assign and cancel will not push a new element to the navigation stack!
             * TODO: refactore access to names ('reset' and 'save')
             */
            if (action.getParameter() == null) {
                if (current instanceof Bean && !current.isMultiValue())
                    action.setParameter(((Bean)current).getInstance());
                else if (current.isMultiValue())
                    action.setParameter(getContextParameter());
            }
            Object result;
            //on parametrized actions provide a new detail dialog/page
            if (!Util.isEmpty(action.getArgumentTypes())) {
                if (!nav.current().getName().equals(action.getShortDescription())) {//define the arguments
                    if (action instanceof MethodAction) {
                        result = nav.current() instanceof Bean ? ((MethodAction) action).toBean(((Bean)nav.current()).getInstance()) : ((MethodAction) action).toBean();
                    } else {
                        Map args = MapUtil.fromKeys(MethodAction.getArgumentNames(action));
                        //TODO: extend the BeanCollector to use @Constraint of each argument (=row)
                        BeanDefinition bean = BeanCollector.getBeanCollector(CollectionUtil.getContainer(args), 0);
                        bean.setName(action.getShortDescription());
                        bean.addAction(action);
                        result = bean;
                    }
                } else {//set the arguments and start the parameterized action
                    Object[] values = null;
                    if (nav.current() instanceof BeanCollector) {
                        MapEntrySet argSet = (MapEntrySet) ((BeanCollector) nav.current()).getCurrentData();
                        values = argSet.map().values().toArray();
                    } else {
                        values = nav.current().toValueMap(null).values().toArray();
                    }
                    Object[] args = action.getParameter() != null
                        ? CollectionUtil.concat(Arrays.copyOfRange(action.getParameter(), 0, 1),
                            values)
                        : values;
                    action.setParameter(args);
                    result = action.activate();
                }
            } else {
                result = action.activate();
                if (action.getId().endsWith(".save") || action.getId().endsWith(".delete")) {
                    if (ChatMessage.isChatMessage(nav.current()) && nav.current() instanceof Bean) {
                        ChatMessage.createChatRequest(this, (Bean)nav.current());
                    } else {
                        EMessage.broadcast(this,
                            ENV.translate("tsl2nano.value.changed", false,
                                nav.current().getName() + ": " + nav.current(),
                                this.getUserAuthorization().getUser(), action.getShortDescription()),
                            "*");
                    }
                } else if (action.getId().equals(PersistenceUI.ACTION_LOGIN_OK)) {
                	sessionClassloader = Thread.currentThread().getContextClassLoader();
                }
            }
            Plugins.process(INanoPlugin.class).actionAfterHandler(action);

            /*
             * if action is asynchron, it's a long term action showing the same page again
             * with progress informations
             */
//                if (action.isSynchron())
//                    throw new Message("starting long term request:\t" + action.getShortDescription());
            if (result != null && responseObject != IAction.CANCELED && !action.getId().endsWith("save")) {
                responseObject = result;
                if (current instanceof Bean
                    && ((Bean) current).getInstance() instanceof Persistence) {
                    setUserAuthorization(ConcurrentUtil.getCurrent(Authorization.class));
                    setBeanContainer(ConcurrentUtil.getCurrent(BeanContainer.class));
                }
            } else if (action.getId().endsWith("reset")) {
                responseObject = current;
            } else {
//                    action.activate();
//                return responseObject;
            }
        }
        return responseObject;
    }

    private void convertIDs(Map parms) {
        Set keys = parms.keySet();
        for (String k : keys) {
            parms.put(k, beanID(parms.get(k)));
        }
    }

    private void unescape(Map parms) {
        Set keys = parms.keySet();
        for (String k : keys) {
            parms.put(k, HtmlUtil.Unescape.un((parms.get(k))));
        }
    }

    /**
     * context parameters will be evaluated from context beans. these beans may have references to other beans. so the
     * context beans have to be in the right order.
     * 
     * @return context parameters
     */
    private Parameter getContextParameter() {
        Collection con = getContext().values();
        Parameter p = new Parameter();
        LOG.debug("filling context for session: " + this);
        //full beans
        BeanDefinition c;
        for (Object v : con) {
            c = Bean.getBean(v);
            p.put(c.getName(), c);
        }
        //all bean attributes
        for (Object v : con) {
            if (v instanceof IRange)
                v = ((IRange)v).getFrom();
            c = Bean.getBean(v);
            p.putAll(c.toValueMap(p));
        }
        //do that twice to let rules and queries use defined parameter
        LOG.debug("second iteration on context for session: " + this);
        for (Object v : con) {
            if (v instanceof IRange)
                v = ((IRange)v).getFrom();
            c = Bean.getBean(v);
            p.putAll(c.toValueMap(p));
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("session:" + this + "\n\tcontext parameters: " + p.keySet());
        }
        return p;
    }

    @SuppressWarnings("static-access")
    protected void addContextObject(BeanDefinition object) {
        ((Collection) this.context).add(object);
        ENV.get(XmlGenUtil.class).saveXml(getSessionFile(authorization).getPath(), this);
    }

    @SuppressWarnings("static-access")
    protected boolean removeContextObject(BeanDefinition object) {
        boolean result = ((Collection) this.context).remove(object);
        if (result)
            ENV.get(XmlGenUtil.class).saveXml(getSessionFile(authorization).getPath(), this);
        return result;
    }

    private void logaction(IAction action, Map parameter) {
        logaction(action.getId(), parameter);
    }

    private void logaction(String id, Map p) {
        actionLog.add(DateUtil.getFormattedTimeStamp() + " ==> " + id + " (" + nav.current() + ")"
            + (!Util.isEmpty(p) && (nav.current() != null && !Persistence.class.isAssignableFrom(nav.current().getClazz())) ? "\n\t" + p : ""));
    }

    private BeanDefinition putSelectionOnStack(BeanCollector c) {
        Collection selection = (Collection) c.getSelectionProvider().getValue();
        BeanDefinition firstElement = null;
        BeanDefinition bean;
        for (Object object : selection) {
            bean =
                (BeanDefinition) (object instanceof BeanDefinition ? object : Bean.getBean(object));
            //don't add the first element, see behaviour in getNextModel()
            if (firstElement != null) {
                nav.add(bean);
            } else {
                firstElement = bean;
            }
        }
        return firstElement;
    }

    private IAction getAction(Collection actions, String id) {
        if (actions != null) {
            for (IAction a : actions) {
                if (a.getId().trim().equals(id)) {
                    return a;
                }
            }
        }
        return null;
    }

    protected boolean isCanceled(Map parms) {
        return parms.containsKey(BTN_CANCEL);
    }

    protected boolean isReturn(Map parms) {
        return isCanceled(parms) || isSubmitAssign(parms);
    }

    protected boolean isSubmitAssign(Map parms) {
        return isSubmitAssign(parms, false);
    }
    protected boolean isSubmitAssign(Map parms, boolean any) {
        return parms.containsKey(BTN_ASSIGN) || parms.containsKey(BTN_SUBMIT) 
        || (any && parms.keySet().stream().anyMatch(k -> k.endsWith(".save") || k.endsWith(".assign")));
    }

    protected  boolean isNewAction(Map parms, BeanCollector model) {
        for (Object k : parms.keySet()) {
            if (isNewAction((String) k, model)) {
                return true;
            }
        }
        return false;
    }

    protected  boolean isNewAction(String actionId, BeanCollector model) {
        return actionId.equals(BeanContainer.getActionId(model.getClazz(), true, "new"));
    }

    protected  boolean isOpenAction(Map parms, BeanCollector model) {
        for (Object k : parms.keySet()) {
            if (isOpenAction((String) k, model)) {
                return true;
            }
        }
        return false;
    }

    protected  boolean isOpenAction(String actionId, BeanCollector model) {
        return actionId.equals(BeanContainer.getActionId(model.getClazz(), true, "open"));
    }

    protected  boolean isSearchRequest(Map parms, BeanCollector model) {
        for (Object k : parms.keySet()) {
            if (isSearchRequest((String) k, model)) {
                return true;
            }
        }
        return false;
    }

    /* *******************************************************************
     * search algorithms
     * ******************************************************************/

    protected  boolean isSearchRequest(String actionId, BeanCollector model) {
        return model.hasMode(IBeanCollector.MODE_SEARCHABLE) && actionId.equals(model.getSearchAction().getId());
    }

    protected  BeanCollector processSearchRequest(Map parms, BeanCollector model) {
//        try {
        //fill the search values
        Bean filterBean = model.getBeanFinder().getFilterRange();
        if (filterBean != null) {
            Bean from = (Bean) filterBean.getValueAsBean("from", false);
            Bean to = (Bean) filterBean.getValueAsBean("to", false);
            final String NAME = "name";
            if (!from.getAttributeNames()[0].equals(NAME) || from.getAttributeNames().length != 1) {
                from.getPresentationHelper().change(BeanPresentationHelper.PROP_DOVALIDATION, false);
//                if (from.hasAttribute(NAME)) {
//                    from.setAttributeFilter(NAME);
//                }
//            from.setName(null);
                to.getPresentationHelper().change(BeanPresentationHelper.PROP_DOVALIDATION, false);
//                if (to.hasAttribute(NAME))
//                {
//                    to.setAttributeFilter(NAME);
//            to.setName(null);
//                }
            }

            for (String p : parms.keySet()) {
                String rowName = StringUtil.substring(p, null, ".", true);
                String colName = StringUtil.substring(p, ".", null, true);
                if (from.getPresentationHelper().prop(KEY_FILTER_FROM_LABEL).equals(rowName)) {
                    from.changeToParsedValue(colName, parms.get(p));
                } else if (to.getPresentationHelper().prop(KEY_FILTER_TO_LABEL).equals(rowName)) {
                    to.changeToParsedValue(colName, parms.get(p));
                } else {
                    from.changeToParsedValue(colName, parms.get(p));
                    to.changeToParsedValue(colName, parms.get(p));
                }
            }
        }
        model.getSearchAction().activate();
        //TODO: put only, if range is filled - how can we evaluate that?
        putSearchParameterToContext(model);
//        } catch (Exception ex) {
//            //don't break the panel-creation - the full exception will be handled in main-session-routine.
//            LOG.error("couldn' fill search-panel values", ex);
//        }
        //a search request will show the same search panel again - but with filtered data.
        return model;
    }

    /**
     * putSearchParameterToContext
     * 
     * @param model
     */
    private  void putSearchParameterToContext(BeanCollector model) {
        // create shallow copies of filter, from, to
        if (model.getBeanFinder().getFilterRange() != null) {
            IRange filter = BeanUtil.clone(model.getBeanFinder().getFilterRange().getInstance());
            //replace entities with copies holding only the id
            Bean.getBean(filter).setValue("from", BeanContainer.detachEntities(BeanUtil.clone(filter.getFrom())));
            Bean.getBean(filter).setValue("to", BeanContainer.detachEntities(BeanUtil.clone(filter.getTo())));
            context.put(PREFIX_CONTEXT_RANGE + model.getDeclaringClass().getName(), filter);
        }
    }

    /**
     * evaluates all selected checkboxes of a table (given by a beancollector) and fills a collection with selected
     * table-beans
     * 
     * @param c model, holding table data
     * @param parms user response
     * @return all selected table beans
     */
    Collection getSelectedElements(BeanCollector c, Map parms) {
        Collection selectedElements = new LinkedList();
        Number selection;
        Collection data = c.getCurrentData();
        for (String p : parms.keySet()) {
            selection = NumberUtil.extractNumber(p);
            if (selection != null && "on".equalsIgnoreCase(parms.get(p))) {
                //evaluate selected element to be used by an action
                Object selectedBean = CollectionUtil.getList(data.iterator())
                    .get(selection.intValue()
                        - (ENV.get("layout.grid.searchrow.show", true) && !c.isSimpleList() && c.hasMode(MODE_SEARCHABLE) && c.hasFilter()
                            ? OFFSET_FILTERLINES : 0));
                selectedElements.add(selectedBean);
            }
        }
        return selectedElements;
    }

    /**
     * uses {@link #getSelectedElements(BeanCollector, Map)} to provide the selection to the
     * selectionprovider of the beancollector.
     * 
     * @param c table model
     * @param parms user response
     */
    boolean provideSelection(BeanCollector c, Map parms) {
        Collection elements = getSelectedElements(c, parms);
        c.getSelectionProvider().setValue(elements);
        if (c.getComposition() != null) {
            c.getCurrentData().retainAll(elements);
        }
        return !c.getSelectionProvider().isEmpty();
//
//        if (elements.size() > 0)
//            navigation.push(new Bean(elements.iterator().next()));
    }

    @Override
    public Object getId() {
        return id;
    }

    public String getKey() {
        if (key == null)
            key =  StringUtil.toHexString(Util.cryptoHash(ObjectUtil.serialize(id)));
        return key;
    }
    
    @Override
    public Context getContext() {
        return context;
    }

    public void setContext(Context context) {
    	this.context = context;
    }
    
    @Override
    public ClassLoader getSessionClassLoader() {
        return sessionClassloader;
    }

    @Override
    public UncaughtExceptionHandler getExceptionHandler() {
        return exceptionHandler;
    }

    @Override
    public long getDuration() {
        return System.currentTimeMillis() - sessionStart;
    }

    @Override
    public long getLastAccess() {
        return lastAccess;
    }

    @Override
    public Main getApplication() {
        return server;
    }

    @Override
    public IAuthorization getUserAuthorization() {
        return authorization;
    }

    @Override
    public BeanDefinition[] getNavigationStack() {
        return nav.toArray();
    }

    @Override
    public BeanDefinition getWorkingObject() {
        return nav.current();
    }

    public InetAddress getInetAddress() {
        return inetAddress;
    }
    
    /**
     * {@inheritDoc}
     */
    @Override
    public int getWebsocketPort() {
        return websocketPort;
    }

    public List getActionLog() {
		return actionLog;
	}
    
    @Override
    public boolean check(long timeout, boolean throwException) {
        boolean authenicatedButNotConnected =
            nav != null && nav.current() != null && !Persistence.class.isAssignableFrom(nav.current().getDeclaringClass())
                && authorization != null && !BeanContainer.isConnected();
        boolean expired = System.currentTimeMillis() - getLastAccess() > timeout || nav == null || nav.isEmpty()
            || authenicatedButNotConnected;
        if (expired) {
            LOG.info("session " + this + " expired!");
            if (throwException) {
                close();
                throw new ManagedException("session closed");
            }
        }
        return !expired;
    }

    @Override
    public void handleEvent(EMessage e) {
        if (e instanceof ChatMessage) {
            ((ChatMessage)e).handleChatRequest(this);
        } else if (ENV.get("session.onpersist.broadcast.alert", true)) {
            if (BeanContainer.instance().hasPermission(e.getMsg().toString(), null)
                && (e.getDestPath() == null
                    || toString().startsWith(StringUtil.substring(e.getDestPath(), null, "*")))) {
                Message.send(exceptionHandler, e.getMsg().toString());
            }
        }
    }

    @Override
    public String toString() {
        return getId().toString();
    }

	public void sendMessage(String txt) {
   		exceptionHandler.uncaughtException(Thread.currentThread(), new Message(txt));
	}

    public boolean isNew() {
        return requests == 0;
    }

    public String getRequestId() {
        return requestId;
    }
}
    
    
    
    

    




    
    
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