/*

  *   SONEWS News Server

  *   see AUTHORS for the list of contributors

  *

  *   This program is free software: you can redistribute it and/or modify

  *   it under the terms of the GNU 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.sonews.web;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Set;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.sonews.util.StringTemplate;

 import org.sonews.util.io.Resource;

 /**

  * Servlet providing a configuration web interface.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class SonewsConfigServlet extends AbstractSonewsServlet

 {

   private static final long serialVersionUID = 2432543253L;

   @Override

   public void doGet(HttpServletRequest req, HttpServletResponse resp)

     throws IOException

   {

     synchronized(this)

     {

       connectToNewsserver();

       String which = req.getParameter("which");

       if(which != null && which.equals("config"))

       {

         whichConfig(req, resp);

       }

       else if(which != null && which.equals("groupadd"))

       {

         whichGroupAdd(req, resp);

       }

       else if(which != null && which.equals("groupdelete"))

       {

         whichGroupDelete(req, resp);

       }

       else

       {

         whichNone(req, resp);

       }

       disconnectFromNewsserver();

     }

   }

   private void whichConfig(HttpServletRequest req, HttpServletResponse resp)

     throws IOException

   {

     StringBuilder keys = new StringBuilder();

     Set pnames = req.getParameterMap().keySet();

     for(Object obj : pnames)

     {

       String pname = (String)obj;

       if(pname.startsWith("configkey:"))

       {

         String value = req.getParameter(pname);

         String key   = pname.split(":")[1];

         if(!value.equals("<not set>"))

         {

           printlnToNewsserver("XDAEMON SET " + key + " " + value);

           readlnFromNewsserver();

           keys.append(key); 

           keys.append("<br/>");

         }

       }

     }

     StringTemplate tmpl = getTemplate("ConfigUpdated.tmpl");

     tmpl.set("UPDATED_KEYS", keys.toString());

     resp.setStatus(HttpServletResponse.SC_OK);

     resp.getWriter().println(tmpl.toString());

     resp.getWriter().flush();

   }

   private void whichGroupAdd(HttpServletRequest req, HttpServletResponse resp)

     throws IOException

   {

     String[] groupnames = req.getParameter("groups").split("\n");

     for(String groupname : groupnames)

     {

       groupname = groupname.trim();

       if(groupname.equals(""))

       {

         continue;

       }

       printlnToNewsserver("XDAEMON GROUPADD " + groupname + " 0");

       String line = readlnFromNewsserver();

       if(!line.startsWith("200 "))

       {

         System.out.println("Warning " + groupname + " probably not created!");

       }

     }

     StringTemplate tmpl = getTemplate("GroupAdded.tmpl");

     tmpl.set("GROUP", req.getParameter("groups"));

     resp.setStatus(HttpServletResponse.SC_OK);

     resp.getWriter().println(tmpl.toString());

     resp.getWriter().flush();

   }

   private void whichGroupDelete(HttpServletRequest req, HttpServletResponse resp)

     throws IOException

   {

     String groupname = req.getParameter("group");

     printlnToNewsserver("XDAEMON GROUPDEL " + groupname);

     String line = readlnFromNewsserver();

     if(!line.startsWith("200 "))

       throw new IOException(line);

     StringTemplate tmpl = getTemplate("GroupDeleted.tmpl");

     tmpl.set("GROUP", groupname);

     resp.setStatus(HttpServletResponse.SC_OK);

     resp.getWriter().println(tmpl.toString());

     resp.getWriter().flush();

   }

   private void whichNone(HttpServletRequest req, HttpServletResponse resp)

     throws IOException

   {

     StringTemplate tmpl = getTemplate("SonewsConfigServlet.tmpl");

     // Retrieve config keys from server

     List<String> configKeys = new ArrayList<String>();

     printlnToNewsserver("XDAEMON LIST CONFIGKEYS");

     String line = readlnFromNewsserver();

     if(!line.startsWith("200 "))

       throw new IOException("XDAEMON command not supported!");

     for(;;)

     {

       line = readlnFromNewsserver();

       if(line.equals("."))

         break;

       else

         configKeys.add(line);

     }

     // Construct config table

     StringBuilder strb = new StringBuilder();

     for(String key : configKeys)

     {

       strb.append("<tr><td><code>");

       strb.append(key);

       strb.append("</code></td><td>");

       // Retrieve config value from server

       String value = "<not set>";

       printlnToNewsserver("XDAEMON GET " + key);

       line = readlnFromNewsserver();

       if(line.startsWith("200 "))

       {

         value = readlnFromNewsserver();

         readlnFromNewsserver(); // Read the "."

       }

       strb.append("<input type=text name=\"configkey:");

       strb.append(key);

       strb.append("\" value=\"");

       strb.append(value);

       strb.append("\"/></td></tr>");

     }

     tmpl.set("CONFIG", strb.toString());

     // Retrieve served newsgroup names from server

     List<String> groups = new ArrayList<String>();

     printlnToNewsserver("LIST");

     line = readlnFromNewsserver();

     if(line.startsWith("215 "))

     {

       for(;;)

       {

         line = readlnFromNewsserver();

         if(line.equals("."))

         {

           break;

         }

         else

         {

           groups.add(line.split(" ")[0]);

         }

       }

     }

     else

       throw new IOException("Error issuing LIST command!");

     // Construct groups list

     StringTemplate tmplGroupList = new StringTemplate(

       Resource.getAsString("org/sonews/web/tmpl/GroupList.tmpl", true));

     strb = new StringBuilder();

     for(String group : groups)

     {

       tmplGroupList.set("GROUPNAME", group);

       strb.append(tmplGroupList.toString());

     }

     tmpl.set("GROUP", strb.toString());

     // Set server name

     tmpl.set("SERVERNAME", hello.split(" ")[2]);

     tmpl.set("TITLE", "Configuration");

     resp.getWriter().println(tmpl.toString());

     resp.getWriter().flush();

     resp.setStatus(HttpServletResponse.SC_OK);

   }

 }