/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License.  You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is the Grendel mail/news client.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are Copyright (C) 1997
 * Netscape Communications Corporation.  All Rights Reserved.
 *
 * Created: Will Scullin <scullin@netscape.com>, 19 Nov 1997.
 *
 * Contributors: Jeff Galyan <talisman@anamorphic.com>
 *               Edwin Woudt <edwin@woudt.nl>
 */

package grendel.ui;

import java.util.Properties;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import java.util.Vector;

import javax.mail.AuthenticationFailedException;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;

import javax.swing.JOptionPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.EventListenerList;

import grendel.prefs.base.ServerArray;
import grendel.prefs.base.ServerStructure;
import grendel.view.ViewedStore;
import grendel.view.ViewedStoreBase;

import java.lang.ClassNotFoundException;
import java.lang.NoSuchMethodException;
import java.lang.IllegalAccessException;
import java.lang.IllegalArgumentException;
import java.lang.InstantiationException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;


public class StoreFactory {
  static StoreFactory fInstance = null;

  Session fSession = null;
  ViewedStore[] fStores = null;
  DialogAuthenticator fAuthenticator = null;
  EventListenerList fListeners = new EventListenerList();

  private StoreFactory() {
    //Preferences prefs = PreferencesFactory.Get();
    //fAuthenticator = new DialogAuthenticator();
    //fSession = Session.getDefaultInstance(prefs.getAsProperties(),
    //                             fAuthenticator);
    fSession = Session.getDefaultInstance(new Properties(),null);
    fSession.setDebug(true);
  }

  public synchronized static StoreFactory Instance() {
    if (fInstance == null) {
      fInstance = new StoreFactory();
    }
    return fInstance;
  }

  public Session getSession() {
    return fSession;
  }

  public synchronized ViewedStore[] getStores() {
    if (fStores == null) {
      updateStores();
    }

    return fStores;
  }

  private synchronized ViewedStore createStore(int ID) {

    ServerStructure prefs = ServerArray.GetMaster().get(ID);

    Store store = null;
    ViewedStore viewedStore = null;

    String proto = prefs.getType();
    URLName urlName = new URLName(proto,null,-1,null,null,null);

    // ### Very wrong temporary hack -- these protocols should be registered 
    // correctly with JavaMail trough the javamail.providers file

    try {
      Class c = null;
      if (proto.equalsIgnoreCase("berkeley")) {
        c = Class.forName("grendel.storage.BerkeleyStore");
        urlName = new URLName(proto,null,-1,prefs.getBerkeleyDirectory(),null,null);
      } else if (proto.equalsIgnoreCase("pop3")) {
        c = Class.forName("com.sun.mail.pop3.POP3Store;");
      } else if (proto.equalsIgnoreCase("news")) {
        c = Class.forName("dog.mail.nntp.NNTPStore");
        //c = Class.forName("grendel.storage.NewsStore");
      }

      if (c != null) {
        Object args[] = { fSession, urlName };
        Class types[] = { args[0].getClass(), args[1].getClass() };
        Constructor cc = c.getConstructor(types);
        store = (Store) cc.newInstance(args);
      }
    } catch (ClassNotFoundException c) {        // Class.forName
    } catch (NoSuchMethodException c) {         // Constructor.getConstructor
    } catch (IllegalAccessException c) {        // Constructor.newInstance
    } catch (IllegalArgumentException c) {      // Constructor.newInstance
    } catch (InstantiationException c) {        // Constructor.newInstance
    } catch (InvocationTargetException c) {     // Constructor.newInstance
    }

    if (store == null) {
      try {
        store = fSession.getStore(proto);
      } catch (MessagingException e) {
        System.out.println("Got exception " + e +
                           " while creating store of type" + proto);
        e.printStackTrace();
      }
    }

    viewedStore = new ViewedStoreBase(store, ID);

    return viewedStore;
  }
  
  private synchronized void closeStores() {
    for (int i=0; i<fStores.length; i++) {
      try {
        fStores[i].getStore().close();
      } catch (MessagingException mex) {
        mex.printStackTrace();
      }
    }
  }

  private synchronized void updateStores() {
    if (fSession == null) {
      getSession();
    }

    if (fStores != null) {
      closeStores();
    }
        
    ServerArray prefs = ServerArray.GetMaster();

    fStores = new ViewedStore[prefs.size()];
    
    for (int i=0; i<prefs.size(); i++) {
      fStores[i] = createStore(i);
    }
  }

  public synchronized void refreshStores() {
    updateStores();

    Object[] listeners = fListeners.getListenerList();
    ChangeEvent event = null;
    for (int i = 0; i < listeners.length - 1; i += 2) {
      // Lazily create the event:
      if (event == null)
        event = new ChangeEvent(this);
      ((ChangeListener)listeners[i+1]).stateChanged(event);
    }
  }

  public void addChangeListener(ChangeListener l) {
    fListeners.add(ChangeListener.class, l);
  }

  public void removeChangeListener(ChangeListener l) {
    fListeners.remove(ChangeListener.class, l);
  }
}