/*
 *  Copyright (c) 2002-2003, The Joust Project
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions 
 *  are met:
 *
 *  - Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *  - Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 *  - Neither the name of the Joust Project nor the names of its
 *    contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 *  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 *  POSSIBILITY OF SUCH DAMAGE.
 *
 *  File created by keith @ Feb 24, 2003
 *
 */

package edu.tufts.vue.collab.im;

import net.kano.joscar.snac.SnacRequest;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class SnacManager {
    protected Map conns = new HashMap();
    protected PendingSnacMgr pendingSnacs = new PendingSnacMgr();
    protected List listeners = new ArrayList();
    protected Map supportedFamilies = new IdentityHashMap();

    public SnacManager() { }

    public SnacManager(PendingSnacListener listener) {
        addListener(listener);
    }

    public void register(BasicConn conn) {
        int[] families = conn.getSnacFamilies();
        supportedFamilies.put(conn, families);

        for (int i = 0; i < families.length; i++) {
            int familyCode = families[i];
            Integer family = new Integer(familyCode);

            List handlers = (List) conns.get(family);

            if (handlers == null) {
                handlers = new LinkedList();
                conns.put(family, handlers);
            }

            if (!handlers.contains(conn)) handlers.add(conn);
        }
    }

    public void dequeueSnacs(BasicConn conn) {
        int[] infos = (int[]) supportedFamilies.get(conn);

        if (infos != null) {
            for (int i = 0; i < infos.length; i++) {
                int familyCode = infos[i];
                if (pendingSnacs.isPending(familyCode)) {
                    dequeueSnacs(familyCode);
                }
            }
        }
    }

    protected void dequeueSnacs(int familyCode) {
        SnacRequest[] pending = pendingSnacs.getPending(familyCode);
        
        pendingSnacs.setPending(familyCode, false);

        for (Iterator it = listeners.iterator(); it.hasNext();) {
            PendingSnacListener listener = (PendingSnacListener) it.next();

            listener.dequeueSnacs(pending);
        }
    }

    public void unregister(BasicConn conn) {
        for (Iterator it = conns.values().iterator(); it.hasNext();) {
            List handlers = (List) it.next();

            handlers.remove(conn);
        }
    }

    public BasicConn getConn(int familyCode) {
        Integer family = new Integer(familyCode);

        List handlers = (List) conns.get(family);

        if (handlers == null || handlers.size() == 0) return null;

        return (BasicConn) handlers.get(0);
    }


    public boolean isPending(int familyCode) {
        return pendingSnacs.isPending(familyCode);
    }

    public void addRequest(SnacRequest request) {
        pendingSnacs.add(request);
    }

    public void addListener(PendingSnacListener l) {
        if (!listeners.contains(l)) listeners.add(l);
    }

    public void removeListener(PendingSnacListener l) {
        listeners.remove(l);
    }

    public void setPending(int family, boolean pending) {
        pendingSnacs.setPending(family, pending);
    }
}