/**
 * 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.exoplatform.portal.webui.component;

import java.util.List;

import javax.portlet.MimeResponse;
import javax.portlet.PortletPreferences;
import javax.portlet.PortletRequest;
import javax.portlet.ResourceRequest;
import javax.portlet.ResourceURL;

import org.exoplatform.portal.mop.navigation.GenericScope;
import org.exoplatform.portal.mop.navigation.Scope;
import org.exoplatform.portal.mop.user.UserNode;
import org.exoplatform.web.url.navigation.NodeURL;
import org.exoplatform.web.url.navigation.NavigationResource;
import org.exoplatform.portal.webui.navigation.TreeNode;
import org.exoplatform.portal.webui.navigation.UIPortalNavigation;
import org.exoplatform.portal.webui.util.Util;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.application.portlet.PortletRequestContext;
import org.exoplatform.webui.config.annotation.ComponentConfig;
import org.exoplatform.webui.config.annotation.ComponentConfigs;
import org.exoplatform.webui.config.annotation.EventConfig;
import org.exoplatform.webui.core.UIPortletApplication;
import org.exoplatform.webui.core.lifecycle.UIApplicationLifecycle;
import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Created by The eXo Platform SARL
 * Author : Dang Van Minh
 *          minhdv81@yahoo.com
 * Jul 3, 2006  
 */
@ComponentConfigs({
   @ComponentConfig(lifecycle = UIApplicationLifecycle.class, template = "system:/groovy/webui/core/UISitemap.gtmpl"),
   @ComponentConfig(type = UIPortalNavigation.class, id = "UISiteMap", events = {
      @EventConfig(listeners = UIPortalNavigation.CollapseAllNodeActionListener.class),
      @EventConfig(listeners = UIPortalNavigation.CollapseNodeActionListener.class)})})
public class UISitemapPortlet extends UIPortletApplication
{

   public static final int DEFAULT_LEVEL = 2;
   
   public UISitemapPortlet() throws Exception
   {

      PortletRequestContext context = (PortletRequestContext)WebuiRequestContext.getCurrentInstance();
      PortletRequest prequest = context.getRequest();
      PortletPreferences prefers = prequest.getPreferences();
      String template = prefers.getValue("template", "system:/groovy/webui/core/UISitemapTree.gtmpl");

      UIPortalNavigation uiPortalNavigation = addChild(UIPortalNavigation.class, "UISiteMap", null);
      uiPortalNavigation.setTemplate(template);
      uiPortalNavigation.setUseAjax(isUseAjax());
      
      int level = DEFAULT_LEVEL; 
      try 
      {
         level = Integer.valueOf(prefers.getValue("level", String.valueOf(DEFAULT_LEVEL)));       
      }
      catch (Exception ex) 
      {
         log.warn("Preference for navigation level can only be integer");
      }
      
      if (level <= 0)
      {
         uiPortalNavigation.setScope(Scope.ALL);                     
      }
      else
      {
         uiPortalNavigation.setScope(GenericScope.treeShape(level));
      }
   }

   @Override
   public void serveResource(WebuiRequestContext context) throws Exception
   {
      super.serveResource(context);
      
      ResourceRequest req = context.getRequest();
      String nodeID = req.getResourceID();
            
      JSONArray jsChilds = getChildrenAsJSON(nodeID);
      if (jsChilds == null)
      {
         return;
      }
      
      MimeResponse res = context.getResponse(); 
      res.setContentType("text/json");
      res.getWriter().write(jsChilds.toString());
   }

   private JSONArray getChildrenAsJSON(String nodeID) throws Exception
   {            
      WebuiRequestContext context = WebuiRequestContext.getCurrentInstance();   
      List<TreeNode> childs = null;
      
      UIPortalNavigation uiPortalNavigation = getChild(UIPortalNavigation.class);
      TreeNode tnode = uiPortalNavigation.getTreeNodes().findNodes(nodeID);              
      if (tnode != null) 
      {
         UserNode userNode = uiPortalNavigation.updateNode(tnode.getNode());
         if (userNode != null)
         {
            tnode.setExpanded(true);     
            tnode.setChildren(userNode.getChildren());          
            childs = tnode.getChildren();
         }
      }
      
      JSONArray jsChilds = new JSONArray();
      if (childs == null)
      {
         return null;
      }                  
      MimeResponse res = context.getResponse();
      for (TreeNode child : childs)
      {
         jsChilds.put(toJSON(child, res));
      }
      return jsChilds;
   }

   private JSONObject toJSON(TreeNode tnode, MimeResponse res) throws Exception
   {
      UIPortalNavigation uiPortalNavigation = getChild(UIPortalNavigation.class);
      JSONObject json = new JSONObject();
      UserNode node = tnode.getNode();
      String nodeId = node.getId();
      
      json.put("label", node.getEncodedResolvedLabel());      
      json.put("hasChild", tnode.hasChild());            
      json.put("isExpanded", tnode.isExpanded());
      json.put("collapseURL", uiPortalNavigation.url("CollapseNode", nodeId));  
      
      ResourceURL rsURL = res.createResourceURL();
      rsURL.setResourceID(nodeId);
      json.put("getNodeURL", rsURL.toString());            
      
      if (node.getPageRef() != null)
      {
         NavigationResource resource = new NavigationResource(node);
         NodeURL url = Util.getPortalRequestContext().createURL(NodeURL.TYPE, resource);
         url.setAjax(isUseAjax());
         json.put("actionLink", url.toString());
      } 
      
      JSONArray childs = new JSONArray();
      for (TreeNode child : tnode.getChildren())
      {
         childs.put(toJSON(child, res));
      }      
      json.put("childs", childs);
      return json;
   }   
   
   public boolean isUseAjax()
   {
      PortletRequestContext context = (PortletRequestContext)WebuiRequestContext.getCurrentInstance();
      PortletRequest prequest = context.getRequest();
      PortletPreferences prefers = prequest.getPreferences();
      return Boolean.valueOf(prefers.getValue("useAJAX", "true"));
   }
}
