package de.tivsource.page.css.actions;
   
   import java.io.File;
   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.text.SimpleDateFormat;
   import java.util.Calendar;
   import java.util.GregorianCalendar;
   
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.apache.struts2.ServletActionContext;
  import org.apache.struts2.convention.annotation.Action;
  import org.apache.struts2.convention.annotation.Actions;
  import org.apache.struts2.convention.annotation.Result;
  import org.apache.struts2.interceptor.ServletRequestAware;
  
  import com.opensymphony.xwork2.ActionSupport;
  
  import de.tivsource.ejb3plugin.InjectEJB;
  import de.tivsource.page.common.css.CSSFile;
  import de.tivsource.page.dao.cssfile.CSSFileDaoLocal;
  import de.tivsource.page.dao.property.PropertyDaoLocal;
  
  
  
  /**
   *
   * @author Marc Michele
   */
  public class CssAction extends ActionSupport implements ServletRequestAware {
  
      /**
       * Generierte Versions-Kennung der Klasse.
       */
      private static final long serialVersionUID = 7367696315767291095L;
  
      private static final Logger logger = LogManager.getLogger(CssAction.class);
  
      /**
       * Servlet-Request der die Post und Get Daten der Session enthält.
       */
      private HttpServletRequest servletRequest;
  
      @InjectEJB(name="PropertyDao")
      private PropertyDaoLocal propertyDaoLocal;
  
      @InjectEJB(name="CSSFileDao")
      private CSSFileDaoLocal cssFileDaoLocal;
  
      private FileInputStream cssFileInputStream;
      
      public void setServletRequest(HttpServletRequest servletRequest) {
          this.servletRequest = servletRequest;
      }
  
      /**
       * @return the cssFileInputStream
       */
      public FileInputStream getCssFileInputStream() {
          return cssFileInputStream;
      }
  
      /**
       * Die Methode get() laedt eine Kategorie anhand des
       * ServletRequest-Parameters "category_id" aus der entsprechenden
       * Datenbanktabelle und speichert diese in die Variable "this.category"
       * 
       * @return SUCCESS oder ERROR (wenn Exception);
       */
      @Actions({
          @Action(
              value = "*",
              results = {
                  @Result(
                      name = "success", 
                      type="stream", 
                      params= { "contentType","text/css","inputName","cssFileInputStream"}
                  ),
                  @Result(name = "input", type="tiles", location="cssTemplate")
              }
          )
      })
      public String execute() {
          logger.trace("execute() aufgerufen.");
  
          // Lese lastModified aus der Datenbank
          String lastModified = propertyDaoLocal.findByKey("cssFile.lastModified").getValue();
          // Hole If-Modified-Since aus der Anfrage
          String since = servletRequest.getHeader("If-Modified-Since");
          logger.info("If-Modified-Since: " + since);
  
          // Setze Fomatierung
          // "Thu, 01 Dec 1994 16:00:00 GMT"
          SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz");
          Calendar gregorianCalendar = new GregorianCalendar();
         gregorianCalendar.add(Calendar.HOUR, 12);
         String expires = simpleDateFormat.format(gregorianCalendar.getTime());
 
         HttpServletResponse response = ServletActionContext.getResponse();
         //response.setHeader("Cache-control", "no-cache, no-store");
         //response.setHeader("Pragma", "no-cache");
 
         response.setHeader("Expires", expires);
         response.setHeader("Last-Modified", lastModified);
         response.setHeader("Retry-After", expires);
 
         if(since!=null && since.equals(lastModified)) {
             response.setStatus(304);
             return INPUT;
         }
 
         String cssFileUuid = ServletActionContext.getRequest().getServletPath();
 
         logger.info("CSS-Datei UUID: " + cssFileUuid);
         cssFileUuid = cssFileUuid.replaceAll("/", "");
         cssFileUuid = cssFileUuid.replaceAll(".css", "");
         logger.info("CSS-Datei UUID: " + cssFileUuid);
 
         CSSFile cssFile = this.cssFileDaoLocal.findByUuid(cssFileUuid);
         try {
             this.cssFileInputStream = new FileInputStream(new File(cssFile.getPath()));
             return SUCCESS;
         } catch (FileNotFoundException e) {
             e.printStackTrace();
             return ERROR;
         }
 
     }// Ende execute()
 
 }// Ende class