/*
    * 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.skin;
  
  import java.io.Reader;
  import java.io.StringReader;
  import java.util.Map;
  
  import javax.jcr.Node;
  import javax.jcr.PathNotFoundException;
  
  import org.exoplatform.portal.resource.Resource;
  import org.exoplatform.portal.resource.ResourceResolver;
  import org.exoplatform.portal.resource.SkinConfig;
  import org.exoplatform.portal.resource.SkinService;
  import org.exoplatform.services.log.ExoLogger;
  import org.exoplatform.services.log.Log;
  import org.exoplatform.services.wcm.portal.LivePortalManagerService;
  import org.exoplatform.services.wcm.utils.WCMCoreUtils;
  
  /**
   * Created by The eXo Platform SAS
   * Author : Hoa Pham
   *          hoa.phamvu@exoplatform.com
   * Nov 25, 2008
   */
  public class WCMSkinResourceResolver implements ResourceResolver {
    private SkinService skinService;
    private LivePortalManagerService livePortalService;
  
    /** The log. */
    private static final Log LOG = ExoLogger.getLogger(WCMSkinResourceResolver.class.getName());
  
    public WCMSkinResourceResolver(SkinService skinService, LivePortalManagerService livePortalService) {
      this.skinService = skinService;
      this.livePortalService = livePortalService;
    }
  
    public Resource resolve(String path) {
      if(!path.matches(XSkinService.SKIN_PATH_REGEXP)) return null;
      
      Map<String,String> params = XSkinService.getSkinParams(path);    
      String skinModule = params.get(XSkinService.MODULE_PARAM);
      String siteName = params.get(XSkinService.SITENAME_PARAM);
      String skinName = params.get(XSkinService.SKIN_PARAM);
      
      if (!skinModule.matches(XSkinService.MODULE_NAME_REGEXP)) return null;
      
      String cssPath = null;
      SkinConfig portalSkinConfig = skinService.getSkin(skinModule,skinName);
      if(portalSkinConfig != null) {
        cssPath = portalSkinConfig.getCSSPath();
      }
      //get css for shared portal if the portalName is shared Portal
      if(cssPath == null) {
        for(SkinConfig skinConfig: skinService.getPortalSkins(skinName)) {
          if(skinConfig.getModule().equals(skinModule)) {
            cssPath = skinConfig.getCSSPath();
            break;
          }
        }
      }
      try {
        Node portalNode = livePortalService.getLivePortal(WCMCoreUtils.getSystemSessionProvider(), siteName);
        String pureCssData = WCMCoreUtils.getSiteGlobalActiveStylesheet(portalNode);
        final String cssData = pureCssData.replaceAll("@import(.*)[^/]*.css(.*);", "");
        if(cssData == null)
          return null;
        return new Resource(cssPath) {
          public Reader read() {
            return new StringReader(cssData);
          }
        };
      } catch(PathNotFoundException e) {
        return null;
      } catch(Exception e) {
        if (LOG.isErrorEnabled()) {
          LOG.error("Unexpected error happens", e);
        }
      }
      return null;
    }
  }