/*******************************************************************************
 * Copyright (c) 2003, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Created on Mar 29, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package org.eclipse.jst.j2ee.internal.war.ui.util;

import java.lang.ref.WeakReference;
import java.util.*;

import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.NotificationWrapper;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.EList;
import org.eclipse.jst.j2ee.internal.web.providers.WebAppItemProvider;
import org.eclipse.jst.j2ee.webapplication.WebApp;
import org.eclipse.jst.j2ee.webapplication.WebapplicationPackage;
import org.eclipse.jst.j2ee.webapplication.WelcomeFileList;
import org.eclipse.jst.j2ee.webservice.wsclient.WebServicesClient;
import org.eclipse.jst.j2ee.webservice.wsclient.Webservice_clientPackage;
import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelEvent;
import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelListener;

/**
 * @author jlanuti
 * 
 * To change the template for this generated type comment go to Window - Preferences - Java - Code
 * Generation - Code and Comments
 */
public class J2EEWebAppItemProvider extends WebAppItemProvider {

	private List children = new ArrayList();
	private boolean isInitializing = false;
	private WebErrorPageGroupItemProvider webErrorPageGroup;
	private WebServletGroupItemProvider webServletGroup;
	private WebServletMappingGroupItemProvider webServletMappingGroup;
	private WebFiltersGroupItemProvider webFiltersGroup;
	private WebFilterMappingGroupItemProvider webFilterMappingGroup;
	private WebReferencesGroupItemProvider webRefsGroup;
	private WebSecurityGroupItemProvider webSecurityGroup;
	private J2EEWebServiceClientDDManager clientMgr;
	private WebListenerGroupItemProvider webListenerGroup;
	private WebWelcomeFileGroupItemProvider webWelcomeFileGroup;
	private WebContextParamGroupItemProvider webContextParamGroup;

	/**
	 * Listen and fire updates for 1.3 web service clients
	 */
	private class J2EEWebServiceClientDDManager extends AdapterImpl implements EditModelListener {
		private WeakReference weakWebApp;
		WebServicesClient client;

		public J2EEWebServiceClientDDManager(WeakReference weakWebApp) {
			this.weakWebApp = weakWebApp;
			init();
		}

		

		public void init() {
			// TODO fix up notification
			// editModel = webServiceMgr.getWSEditModel(ProjectUtilities.getProject(webApp));
			// if (editModel != null) {
			// editModel.addListener(this);
			// if (editModel.get13WebServicesClientResource() != null) {
			// client = editModel.get13WebServicesClientResource().getWebServicesClient();
			// if (client != null)
			// client.eAdapters().add(this);
			// }
			// }
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.wst.common.internal.emfworkbench.integration.EditModelListener#editModelChanged(org.eclipse.wst.common.internal.emfworkbench.integration.EditModelEvent)
		 */
		public void editModelChanged(EditModelEvent anEvent) {
			// TODO fix up notification
			// if (editModel == null)
			// init();
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.emf.common.notify.Adapter#notifyChanged(org.eclipse.emf.common.notify.Notification)
		 */
		public void notifyChanged(Notification notification) {
			if (notification.getEventType() == Notification.ADD || notification.getEventType() == Notification.ADD_MANY || notification.getEventType() == Notification.REMOVE || notification.getEventType() == Notification.REMOVE_MANY) {
				if (notification.getFeatureID(WebServicesClient.class) == Webservice_clientPackage.WEB_SERVICES_CLIENT__SERVICE_REFS) {
					NotificationWrapper notificationWrapper = new NotificationWrapper(webRefsGroup, notification);
					fireNotifyChanged(notificationWrapper);
				}
			}
			super.notifyChanged(notification);
		}

		public void dispose() {
			// TODO fix up notification
			
		    webErrorPageGroup.dispose();
		    webContextParamGroup.dispose();
		    webWelcomeFileGroup.dispose(); 
			webServletGroup.dispose();
			webServletMappingGroup.dispose();
			webFiltersGroup.dispose();
			webFilterMappingGroup.dispose();
			webRefsGroup.dispose();
			webSecurityGroup.dispose();
			webListenerGroup.dispose();
			
			weakWebApp = null;
			 if (client != null)
				 client.eAdapters().remove(this);
			 children.clear();
		}
	}

	/**
	 * Default constructor
	 */
	public J2EEWebAppItemProvider(AdapterFactory adapterFactory) {
		super(adapterFactory);
	}

	/**
	 * Initialize the list of children
	 */
	private void initChildren() {
		if (isInitializing)
			return;
		
		isInitializing = true;
		try {
			children.clear();
			if (clientMgr == null) {
				clientMgr = new J2EEWebServiceClientDDManager(weakWebApp);
			}
//			if (!((WebApp)weakWebApp.get()).getErrorPages().isEmpty()) {
//			    children.add(webErrorPageGroup = new WebErrorPageGroupItemProvider(adapterFactory, weakWebApp));
//			} else {
//			    WebErrorPageGroupItemProvider child = null;
//			    for (int i=0; i < children.size(); i++) {
//		            Object object = children.get(i);
//		            if (object instanceof WebErrorPageGroupItemProvider) {
//		                child = (WebErrorPageGroupItemProvider) object;
//		                break;
//		            }
//		        }
//			    if (child != null) {
//			        child.dispose();
//			    }
//			}
//            if (!((WebApp)weakWebApp.get()).getContextParams().isEmpty()) {
//                children.add(webContextParamGroup = new WebContextParamGroupItemProvider(adapterFactory, weakWebApp));
//            } else {
//                WebContextParamGroupItemProvider child = null;
//                for (int i=0; i < children.size(); i++) {
//                    Object object = children.get(i);
//                    if (object instanceof WebContextParamGroupItemProvider) {
//                        child = (WebContextParamGroupItemProvider) object;
//                        break;
//                    }
//                }
//                if (child != null) {
//                    child.dispose();
//                }
//            }
//            WelcomeFileList welcomeFileList = ((WebApp)weakWebApp.get()).getFileList();
//            if (welcomeFileList != null && !welcomeFileList.getFile().isEmpty()) {
//                children.add(webWelcomeFileGroup = new WebWelcomeFileGroupItemProvider(adapterFactory, weakWebApp));
//            } else {
//                WebWelcomeFileGroupItemProvider child = null;
//                for (int i=0; i < children.size(); i++) {
//                    Object object = children.get(i);
//                    if (object instanceof WebWelcomeFileGroupItemProvider) {
//                        child = (WebWelcomeFileGroupItemProvider) object;
//                        break;
//                    }
//                }
//                if (child != null) {
//                    child.dispose();
//                }
//            }
            
            children.add(webErrorPageGroup = new WebErrorPageGroupItemProvider(adapterFactory, weakWebApp));
            children.add(webContextParamGroup = new WebContextParamGroupItemProvider(adapterFactory, weakWebApp));
            children.add(webWelcomeFileGroup = new WebWelcomeFileGroupItemProvider(adapterFactory, weakWebApp));
            
			children.add(webServletGroup = new WebServletGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webServletMappingGroup = new WebServletMappingGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webFiltersGroup = new WebFiltersGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webFilterMappingGroup = new WebFilterMappingGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webRefsGroup = new WebReferencesGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webSecurityGroup = new WebSecurityGroupItemProvider(adapterFactory, weakWebApp));
			children.add(webListenerGroup = new WebListenerGroupItemProvider(adapterFactory, weakWebApp));
		} finally {
			isInitializing = false;
		}
	}

	protected WeakReference weakWebApp = null;

	public Collection getChildren(Object object) {		
		if (object instanceof WebApp) {
			WebApp webApp = (WebApp) object;
			// If uninitialized or web app needs to re-initialize, init the children
			if(weakWebApp == null || children.isEmpty() || webApp != weakWebApp.get()) {
				weakWebApp = new WeakReference(webApp);
				initChildren();
			}
//			if (isInitializing) return children;
//			isInitializing = true;
//			updateContextParams(webApp);
//			updateWelcomePages(webApp);
//			isInitializing = false;
			return children;			
		} 
		return Collections.EMPTY_LIST;
	}

    private void updateContextParams(WebApp webApp) {
        EList contextParams = webApp.getContextParams();
        if (contextParams == null || contextParams.isEmpty()) {
            if (webContextParamGroup != null) { 
                children.remove(webContextParamGroup);
                webContextParamGroup.dispose();
                webContextParamGroup = null;
            }
        } else if (webContextParamGroup == null) { 
            children.add(webContextParamGroup = new WebContextParamGroupItemProvider(adapterFactory, weakWebApp));
        }
    }

    private void updateWelcomePages(WebApp webApp) {
        WelcomeFileList fileList = webApp.getFileList();
        if (fileList == null || fileList.getFile().isEmpty()) {
            if (webWelcomeFileGroup != null) { 
                children.remove(webWelcomeFileGroup);
                webWelcomeFileGroup.dispose();
                webWelcomeFileGroup = null;
            }
        } else if (webWelcomeFileGroup == null) { 
            children.add(webWelcomeFileGroup = new WebWelcomeFileGroupItemProvider(adapterFactory, weakWebApp));
        }
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.edit.provider.ItemProviderAdapter#hasChildren(java.lang.Object)
	 */
	public boolean hasChildren(Object object) {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.common.notify.Adapter#notifyChanged(org.eclipse.emf.common.notify.Notification)
	 */
	public void notifyChanged(Notification notification) {
		// We only care about adds and removes for the different item provider
		// groups
		if (notification.getEventType() == Notification.ADD || notification.getEventType() == Notification.ADD_MANY || notification.getEventType() == Notification.REMOVE || notification.getEventType() == Notification.REMOVE_MANY) {
			Object notifier = null;
			switch (notification.getFeatureID(WebApp.class)) {
			    case WebapplicationPackage.WEB_APP__ERROR_PAGES :
			        notifier = webErrorPageGroup;
			        break;
                case WebapplicationPackage.WEB_APP__CONTEXT_PARAMS :
                    notifier = webContextParamGroup;
                    break;
                case WebapplicationPackage.WEB_APP__FILE_LIST :
                    notifier = webWelcomeFileGroup;
                    break;
				case WebapplicationPackage.WEB_APP__SERVLETS :
					notifier = webServletGroup;
					break;
				case WebapplicationPackage.WEB_APP__SERVLET_MAPPINGS :
					notifier = webServletMappingGroup;
					break;
				case WebapplicationPackage.WEB_APP__FILTERS :
					notifier = webFiltersGroup;
					break;
				case WebapplicationPackage.WEB_APP__FILTER_MAPPINGS :
					notifier = webFilterMappingGroup;
					break;
				case WebapplicationPackage.WEB_APP__EJB_LOCAL_REFS :
				case WebapplicationPackage.WEB_APP__EJB_REFS :
				case WebapplicationPackage.WEB_APP__MESSAGE_DESTINATION_REFS :
				case WebapplicationPackage.WEB_APP__RESOURCE_ENV_REFS :
				case WebapplicationPackage.WEB_APP__RESOURCE_REFS :
				case WebapplicationPackage.WEB_APP__SERVICE_REFS :
					notifier = webRefsGroup;
					break;
				case WebapplicationPackage.WEB_APP__SECURITY_ROLES :
				case WebapplicationPackage.WEB_APP__CONSTRAINTS :
					notifier = webSecurityGroup;
					break;
				case WebapplicationPackage.WEB_APP__LISTENERS :
					notifier = webListenerGroup;
					break;
			}
			if (notifier != null) {
				NotificationWrapper notificationWrapper = new NotificationWrapper(notifier, notification);
				fireNotifyChanged(notificationWrapper);
				return;
			}
		}
		super.notifyChanged(notification);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.emf.edit.provider.IDisposable#dispose()
	 */
	public void dispose() {
		if (clientMgr != null)
			clientMgr.dispose();
		super.dispose();
	}
}