/*
 * Copyright (C) 2003-2008 eXo Platform SAS.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see<http://www.gnu.org/licenses/>.
 */
package org.exoplatform.services.wcm.navigation;

import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Constructor;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;

import javax.portlet.MimeResponse;
import javax.portlet.ResourceURL;

import org.exoplatform.portal.application.PortalRequestContext;
import org.exoplatform.portal.config.UserACL;
import org.exoplatform.portal.config.UserPortalConfig;
import org.exoplatform.portal.config.UserPortalConfigService;
import org.exoplatform.portal.mop.SiteKey;
import org.exoplatform.portal.mop.SiteType;
import org.exoplatform.portal.mop.Visibility;
import org.exoplatform.portal.mop.navigation.NavigationContext;
import org.exoplatform.portal.mop.navigation.Scope;
import org.exoplatform.portal.mop.user.UserNavigation;
import org.exoplatform.portal.mop.user.UserNode;
import org.exoplatform.portal.mop.user.UserNodeFilterConfig;
import org.exoplatform.portal.mop.user.UserPortal;
import org.exoplatform.portal.mop.user.UserPortalImpl;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import org.exoplatform.services.security.ConversationState;
import org.exoplatform.services.wcm.utils.WCMCoreUtils;
import org.exoplatform.webui.application.WebuiRequestContext;

/**
 * Created by The eXo Platform SAS
 * Author : Phan Le Thanh Chuong
 *          chuong.phan@exoplatform.com, phan.le.thanh.chuong@gmail.com
 * Nov 21, 2008
 */
public class NavigationUtils {

  public static final Scope ECMS_NAVIGATION_SCOPE = Scope.CHILDREN;
 
  private static ThreadLocal<Map<String, String>> gotNavigationKeeper = 
    new ThreadLocal<Map<String, String>>();
  
  private static Constructor<UserNavigation> userNavigationCtor = null;

  private static final Log LOG = ExoLogger.getLogger(NavigationUtils.class.getName());
  
  static {
    try {
      //reflection here to get UserNavigation to avoid for using such as: 
      //spaceNav = userPortal.getNavigation(SiteKey.group(groupId));
      userNavigationCtor = UserNavigation.class.getDeclaredConstructor(
                               new Class[] {UserPortalImpl.class, NavigationContext.class, boolean.class});
      userNavigationCtor.setAccessible(true);
    } catch (Exception e) {
      LOG.error(e);
    }
  }  

  public static boolean gotNavigation(String portal, String user) { 
    Map<String, String> navigations = gotNavigationKeeper.get();
    if (navigations == null) return false;
    String navigation = navigations.get(portal + " " + user);
    return (navigation != null);
  }
  
  public static UserNavigation getUserNavigationOfPortal(UserPortal userPortal, String portalName) throws Exception {
    UserPortalConfigService userPortalConfigService = WCMCoreUtils.getService(UserPortalConfigService.class);
    UserACL userACL = WCMCoreUtils.getService(UserACL.class);    
    NavigationContext portalNav = userPortalConfigService.getNavigationService().
                                                          loadNavigation(new SiteKey(SiteType.PORTAL, portalName));
    if (portalNav == null) {
      return null;
    }
    UserPortalConfig userPortalCfg = userPortalConfigService.getUserPortalConfig(portalName, ConversationState.getCurrent().getIdentity().getUserId(), PortalRequestContext.USER_PORTAL_CONTEXT); 
    return userNavigationCtor.newInstance(userPortal, portalNav, userACL.hasEditPermission(userPortalCfg.getPortalConfig()));
  }
  
  /**
   * @purpose Get UserNavigation of a specified element
   * @param UserPortal
   * @param Site Key
   * @return UserNavigation of group  
   */
  public static UserNavigation getUserNavigation(UserPortal userPortal, SiteKey siteKey) throws Exception {
    UserPortalConfigService userPortalConfigService = WCMCoreUtils.getService(UserPortalConfigService.class);
    NavigationContext portalNav = userPortalConfigService.getNavigationService().loadNavigation(siteKey);
    UserACL userACL = WCMCoreUtils.getService(UserACL.class);
    if (portalNav == null) {
      return null;
    }
    UserPortalConfig userPortalCfg = userPortalConfigService.getUserPortalConfig(userPortalConfigService.getDefaultPortal(), ConversationState.getCurrent().getIdentity().getUserId(), PortalRequestContext.USER_PORTAL_CONTEXT);
    return userNavigationCtor.newInstance(userPortal, portalNav, userACL.hasEditPermission(userPortalCfg.getPortalConfig()));
  }
  
  public static void removeNavigationAsJson (String portalName, String username) throws Exception
  {
    String key = portalName + " " + username;
    Map<String, String> navigations = gotNavigationKeeper.get();
    if (navigations != null)
    {
       navigations.remove(key);
       gotNavigationKeeper.set(navigations);
    }
  }
  
  public static String getNavigationAsJSON(String portalName, String username) throws Exception {
    String key = portalName + " " + username;
    Map<String, String> navigations = gotNavigationKeeper.get();
    if (navigations == null) {
      navigations = new Hashtable<String, String>();
    } else {
      String navigationData = navigations.get(key);
      if (navigationData != null) {
        return navigationData;
      }
    }
    UserPortalConfigService userPortalConfigService = WCMCoreUtils.getService(UserPortalConfigService.class);
    UserPortalConfig userPortalCfg = userPortalConfigService.getUserPortalConfig(portalName,
                                                                                 username,
                                                                                 PortalRequestContext.USER_PORTAL_CONTEXT);
    UserPortal userPortal = userPortalCfg.getUserPortal();
    
    //filter nodes
    UserNodeFilterConfig.Builder filterConfigBuilder = UserNodeFilterConfig.builder();
    filterConfigBuilder.withReadWriteCheck().withVisibility(Visibility.DISPLAYED, Visibility.TEMPORAL);
    filterConfigBuilder.withTemporalCheck();
    UserNodeFilterConfig filterConfig = filterConfigBuilder.build();
    
    //get nodes
    UserNavigation navigation = getUserNavigationOfPortal(userPortal, portalName);
    UserNode root = userPortal.getNode(navigation, ECMS_NAVIGATION_SCOPE, filterConfig, null);

    String ret = createJsonTree(navigation, root);
    navigations.put(key, ret);
    gotNavigationKeeper.set(navigations);
    return ret;
  }
  
  private static String createJsonTree(UserNavigation navigation, UserNode rootNode) throws Exception {
    StringBuffer sbJsonTree = new StringBuffer();
    sbJsonTree.append("[");
    sbJsonTree.append("{");
    sbJsonTree.append("\"ownerId\":\"").append(navigation.getKey().getName()).append("\",");
    sbJsonTree.append("\"ownerType\":\"").append(navigation.getKey().getTypeName()).append("\",");
    sbJsonTree.append("\"priority\":\"").append(navigation.getPriority()).append("\",");
    sbJsonTree.append("\"nodes\":").append(addJsonNodes(rootNode.getChildren().iterator()));
    sbJsonTree.append("}");
    sbJsonTree.append("]");
    return sbJsonTree.toString();
  }
  
  private static StringBuffer addJsonNodes(Iterator<UserNode> children) throws Exception {
    StringBuffer sbJsonTree = new StringBuffer();
    sbJsonTree.append("[");
    boolean first = true;

    while (children.hasNext()) {
      UserNode child = children.next();
      if (!first) {
        sbJsonTree.append(",");
      }
      first = false;
      sbJsonTree.append("{");
      sbJsonTree.append("\"icon\":").append(child.getIcon() != null ? "\"" + child.getIcon() + "\""
                                                                   : "null").append(",");
      sbJsonTree.append("\"label\":\"").append(child.getLabel()).append("\",");
      sbJsonTree.append("\"name\":\"").append(child.getName()).append("\",");
      sbJsonTree.append("\"resolvedLabel\":\"").append(child.getResolvedLabel()).append("\",");
      String childURI = "";
      if (child.getPageRef() != null){
        childURI = child.getURI();
      }
      sbJsonTree.append("\"uri\":\"").append(childURI).append("\",");

      WebuiRequestContext context = WebuiRequestContext.getCurrentInstance();
      MimeResponse res = context.getResponse();
      ResourceURL resourceURL = res.createResourceURL();
      resourceURL.setResourceID(res.encodeURL(child.getURI()));
      Writer w = new StringWriter();
      resourceURL.write(w, true);      
      sbJsonTree.append("\"getNodeURL\":\"").append(w.toString()).append("\",");
      sbJsonTree.append("\"nodes\":").append(addJsonNodes(child.getChildren().iterator()));
      sbJsonTree.append("}");
    }
    sbJsonTree.append("]");
    return sbJsonTree;
  }
}
