/*
 * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */


package com.sun.jmx.snmp.daemon;



// java import
//
import java.util.Enumeration;
import java.util.Vector;
import java.util.logging.Level;
// jmx imports
//
import com.sun.jmx.snmp.SnmpPdu;
import com.sun.jmx.snmp.SnmpVarBind;
import com.sun.jmx.snmp.SnmpOid;
import com.sun.jmx.snmp.SnmpValue;
import com.sun.jmx.snmp.SnmpDefinitions;
import com.sun.jmx.snmp.SnmpStatusException;
import com.sun.jmx.snmp.SnmpEngine;
// SNMP Runtime import
//
import static com.sun.jmx.defaults.JmxProperties.SNMP_ADAPTOR_LOGGER;
import com.sun.jmx.snmp.agent.SnmpMibAgent;
import com.sun.jmx.snmp.agent.SnmpMibRequest;
import com.sun.jmx.snmp.ThreadContext;
import com.sun.jmx.snmp.daemon.SnmpAdaptorServer;
import com.sun.jmx.snmp.internal.SnmpIncomingRequest;
import com.sun.jmx.snmp.ThreadContext;

class SnmpSubBulkRequestHandler extends SnmpSubRequestHandler {
    private SnmpAdaptorServer server = null;

    /**
     * The constuctor initialize the subrequest with the whole varbind list contained
     * in the original request.
     */
    protected SnmpSubBulkRequestHandler(SnmpEngine engine,
                                        SnmpAdaptorServer server,
                                        SnmpIncomingRequest incRequest,
                                        SnmpMibAgent agent,
                                        SnmpPdu req,
                                        int nonRepeat,
                                        int maxRepeat,
                                        int R) {
        super(engine, incRequest, agent, req);
        init(server, req, nonRepeat, maxRepeat, R);
    }

    /**
     * The constuctor initialize the subrequest with the whole varbind list contained
     * in the original request.
     */
    protected SnmpSubBulkRequestHandler(SnmpAdaptorServer server,
                                        SnmpMibAgent agent,
                                        SnmpPdu req,
                                        int nonRepeat,
                                        int maxRepeat,
                                        int R) {
        super(agent, req);
        init(server, req, nonRepeat, maxRepeat, R);
    }

    public void run() {

        size= varBind.size();

        try {
            // Invoke a getBulk operation
            //
            /* NPCTE fix for bugId 4492741, esc 0, 16-August-2001 */
            final ThreadContext oldContext =
                ThreadContext.push("SnmpUserData",data);
            try {
                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                        "run", "[" + Thread.currentThread() +
                        "]:getBulk operation on " + agent.getMibName());
                }
                agent.getBulk(createMibRequest(varBind,version,data),
                              nonRepeat, maxRepeat);
            } finally {
                ThreadContext.restore(oldContext);
            }
            /* end of NPCTE fix for bugId 4492741 */

        } catch(SnmpStatusException x) {
            errorStatus = x.getStatus() ;
            errorIndex=  x.getErrorIndex();
            if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
                SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSubRequestHandler.class.getName(),
                    "run", "[" + Thread.currentThread() +
                    "]:an Snmp error occured during the operation", x);
            }
        }
        catch(Exception x) {
            errorStatus = SnmpDefinitions.snmpRspGenErr ;
            if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
                SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSubRequestHandler.class.getName(),
                    "run", "[" + Thread.currentThread() +
                    "]:a generic error occured during the operation", x);
            }
        }
        if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
            SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                "run", "[" + Thread.currentThread() +
                  "]:operation completed");
        }
    }

    private void init(SnmpAdaptorServer server,
                      SnmpPdu req,
                      int nonRepeat,
                      int maxRepeat,
                      int R) {
        this.server = server;
        this.nonRepeat= nonRepeat;
        this.maxRepeat= maxRepeat;
        this.globalR= R;

        final int max= translation.length;
        final SnmpVarBind[] list= req.varBindList;
        final NonSyncVector<SnmpVarBind> nonSyncVarBind =
                ((NonSyncVector<SnmpVarBind>)varBind);
        for(int i=0; i < max; i++) {
            translation[i]= i;
            // we need to allocate a new SnmpVarBind. Otherwise the first
            // sub request will modify the list...
            //
            final SnmpVarBind newVarBind =
                new SnmpVarBind(list[i].oid, list[i].value);
            nonSyncVarBind.addNonSyncElement(newVarBind);
        }
    }

    /**
     * The method updates find out which element to use at update time. Handle oid overlapping as well
     */
    private SnmpVarBind findVarBind(SnmpVarBind element,
                                    SnmpVarBind result) {

        if (element == null) return null;

        if (result.oid == null) {
             return element;
        }

        if (element.value == SnmpVarBind.endOfMibView) return result;

        if (result.value == SnmpVarBind.endOfMibView) return element;

        final SnmpValue val = result.value;

        int comp = element.oid.compareTo(result.oid);
        if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
            SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                "findVarBind","Comparing OID element : " + element.oid +
                  " with result : " + result.oid);
            SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                "findVarBind","Values element : " + element.value +
                  " result : " + result.value);
        }
        if (comp < 0) {
            // Take the smallest (lexicographically)
            //
            return element;
        }
        else {
            if(comp == 0) {
                // Must compare agent used for reply
                // Take the deeper within the reply
                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                        "findVarBind"," oid overlapping. Oid : " +
                          element.oid + "value :" + element.value);
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                         "findVarBind","Already present varBind : " +
                          result);
                }
                SnmpOid oid = result.oid;
                SnmpMibAgent deeperAgent = server.getAgentMib(oid);

                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                        "findVarBind","Deeper agent : " + deeperAgent);
                }
                if(deeperAgent == agent) {
                    if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                        SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                            "findVarBind","The current agent is the deeper one. Update the value with the current one");
                    }
                    return element;
                } else {
                    if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                        SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                            "findVarBind","The current agent is not the deeper one. return the previous one.");
                    }
                    return result;
                }

                /*
                   Vector v = new Vector();
                   SnmpMibRequest getReq = createMibRequest(v,
                   version,
                   null);
                   SnmpVarBind realValue = new SnmpVarBind(oid);
                   getReq.addVarBind(realValue);
                   try {
                   deeperAgent.get(getReq);
                   } catch(SnmpStatusException e) {
                   e.printStackTrace();
                   }

                   if(isDebugOn())
                   trace("findVarBind", "Biggest priority value is : " +
                   realValue.value);

                   return realValue;
                */

            }
            else {
                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                        "findVarBind","The right varBind is the already present one");
                }
                return result;
            }
        }
    }
    /**
     * The method updates a given var bind list with the result of a
     * previsouly invoked operation.
     * Prior to calling the method, one must make sure that the operation was
     * successful. As such the method getErrorIndex or getErrorStatus should be
     * called.
     */
    protected void updateResult(SnmpVarBind[] result) {
        // we can assume that the run method is over ...
        //

        final Enumeration e= varBind.elements();
        final int max= result.length;

        // First go through all the values once ...
        for(int i=0; i < size; i++) {
            // May be we should control the position ...
            //
            if (e.hasMoreElements() == false)
                return;

            // bugId 4641694: must check position in order to avoid
            //       ArrayIndexOutOfBoundException
            final int pos=translation[i];
            if (pos >= max) {
                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINEST)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINEST, SnmpSubRequestHandler.class.getName(),
                        "updateResult","Position '"+pos+"' is out of bound...");
                }
                continue;
            }

            final SnmpVarBind element= (SnmpVarBind) e.nextElement();

            if (element == null) continue;
            if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                    "updateResult","Non repeaters Current element : " +
                      element + " from agent : " + agent);
            }
            final SnmpVarBind res = findVarBind(element,result[pos]);

            if(res == null) continue;

            result[pos] = res;
        }

        // Now update the values which have been repeated
        // more than once.
        int localR= size - nonRepeat;
        for (int i = 2 ; i <= maxRepeat ; i++) {
            for (int r = 0 ; r < localR ; r++) {
                final int pos = (i-1)* globalR + translation[nonRepeat + r] ;
                if (pos >= max)
                    return;
                if (e.hasMoreElements() ==false)
                    return;
                final SnmpVarBind element= (SnmpVarBind) e.nextElement();

                if (element == null) continue;
                if (SNMP_ADAPTOR_LOGGER.isLoggable(Level.FINER)) {
                    SNMP_ADAPTOR_LOGGER.logp(Level.FINER, SnmpSubRequestHandler.class.getName(),
                        "updateResult","Repeaters Current element : " +
                          element + " from agent : " + agent);
                }
                final SnmpVarBind res = findVarBind(element, result[pos]);

                if(res == null) continue;

                result[pos] = res;
            }
        }
    }

    // PROTECTED VARIABLES
    //------------------

    /**
     * Specific to the sub request
     */
    protected int nonRepeat=0;

    protected int maxRepeat=0;

    /**
     * R as defined in RCF 1902 for the global request the sub-request is associated to.
     */
    protected int globalR=0;

    protected int size=0;
}
