/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.etk.core.membership.impl;

import org.etk.common.logging.Logger;
import org.etk.core.membership.Membership;
import org.etk.core.membership.MembershipEventListener;
import org.etk.core.security.ConversationRegistry;
import org.etk.core.security.ConversationState;
import org.etk.core.security.Identity;
import org.etk.core.security.MembershipEntry;
import org.etk.core.security.StateKey;

import java.util.Iterator;

/**
 * @author <a href="mailto:andrew00x@gmail.com">Andrey Parfonov</a>
 * @version $Id: $
 */
public class MembershipUpdateListener extends MembershipEventListener {

  /** Logger. */
  private static final Logger LOG = Logger.getLogger(MembershipUpdateListener.class);

  /** @see ConversationRegistry. */
  private ConversationRegistry conversationRegistry;

  public MembershipUpdateListener(ConversationRegistry conversationRegistry) {
    this.conversationRegistry = conversationRegistry;
  }

  // >>>>>>>
  // Update Identity in each ConversationState. In fact each user may have few
  // ConversationStates but IdentityRegistry keeps Identity that was created
  // when user log-in last time. Any way Identity in IdentityRegistry will be
  // updated through ConversationRegistry.
  // If multi-login is disabled (see DefaultLoginModule, option
  // 'singleLogin'). Then updating may be more simple, in this case enough
  // just remove ConversationState (it should be only one) for specified user,
  // then update Identity in IdentityRegistry. ConversationRegistry will be
  // updated by SetCurrentIdentityFilter in next request.

  /**
   * {@inheritDoc}
   */
  @Override
  public void postDelete(Membership m) throws Exception {
    if (LOG.isDebugEnabled())
      LOG.debug(">>> In postDelete");
    String userId = m.getUserName();
    MembershipEntry expected = new MembershipEntry(m.getGroupId(), m.getMembershipType());
    for (StateKey key : conversationRegistry.getStateKeys(userId)) {
      ConversationState cstate = conversationRegistry.getState(key);
      Identity identity = cstate.getIdentity();
      Iterator<MembershipEntry> iter = identity.getMemberships().iterator();
      while (iter.hasNext()) {
        MembershipEntry tmp = iter.next();
        if (tmp.equals(expected)) {
          iter.remove();
          if (LOG.isDebugEnabled())
            LOG.debug("Removed membership entry " + tmp);
        }
      }
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void postSave(Membership m, boolean isNew) throws Exception {
    if (LOG.isDebugEnabled())
      LOG.debug(">>> In postSave");
    String userId = m.getUserName();
    MembershipEntry me = new MembershipEntry(m.getGroupId(), m.getMembershipType());
    for (StateKey key : conversationRegistry.getStateKeys(userId)) {
      ConversationState cstate = conversationRegistry.getState(key);
      Identity identity = cstate.getIdentity();
      Iterator<MembershipEntry> iter = identity.getMemberships().iterator();
      boolean contains = false;
      while (iter.hasNext()) {
        if (iter.next().equals(me)) {
          contains = true;
          break;
        }
      }
      if (!contains) {
        identity.getMemberships().add(me);
        if (LOG.isDebugEnabled())
          LOG.debug("Added membership entry " + me);
      }
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void preDelete(Membership m) throws Exception {
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void preSave(Membership m, boolean isNew) throws Exception {
  }

}