import java.util.TimeZone;
import java.util.Calendar;
import java.util.Locale;

import java.util.regex.Pattern;
import java.util.regex.Matcher;

import java.io.BufferedReader;

import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamException;

/**
 * This class stores the incoming data from XML.
 * It is needed because of the stream nature of the XML parser.
 **/
public class CAMSIParser
{
   final static Pattern event_pattern;

   static
   {
      event_pattern = Pattern.compile
      (
         "[^<]*<td><[^>]*>([0-9]+)/([0-9]+)/([0-9]+)</[^>]*></td>"
         + "<td><[^>]*>([0-9]+):([0-9]+)</[^>]*></td>"
         + "<td><[^>]*>([0-9]+):([0-9]+)</[^>]*></td>"
         + "<td><[^>]*>([^<]*)</[^>]*></td>" // 8th
         + "<td><[^>]*>([^<]*)</[^>]*></td>"
         + "<td><[^>]*>([^<]*)</[^>]*></td>"
      );
   }

   public static void parse
   (
      final BufferedReader reader,
      final Group group,
      final String uid_prefix
   )
   throws Exception
   {
      int uid;
      String line;
      Matcher matcher;

      uid = 0;

      while (reader.ready())
      {
         line = reader.readLine();
         matcher = event_pattern.matcher(line);

         if (matcher.matches())
         {
            final Event e;
            final java.util.Calendar c_start, c_end;

            c_start = java.util.Calendar.getInstance
            (
               TimeZone.getTimeZone("Europe/Paris"),
               Locale.FRENCH
            );

            c_start.set
            (
               java.util.Calendar.DAY_OF_MONTH,
               Integer.parseInt(matcher.group(1))
            );

            c_start.set
            (
               java.util.Calendar.MONTH,
               /* It's Java... don't question it. */
               (Integer.parseInt(matcher.group(2)) - 1)
            );

            c_start.set
            (
               java.util.Calendar.YEAR,
               Integer.parseInt(matcher.group(3))
            );

            c_start.set
            (
               java.util.Calendar.HOUR_OF_DAY,
               Integer.parseInt(matcher.group(4))
            );

            c_start.set
            (
               java.util.Calendar.MINUTE,
               Integer.parseInt(matcher.group(5))
            );


            c_end = (java.util.Calendar) c_start.clone();

            c_end.set
            (
               java.util.Calendar.HOUR_OF_DAY,
               Integer.parseInt(matcher.group(6))
            );

            c_end.set
            (
               java.util.Calendar.MINUTE,
               Integer.parseInt(matcher.group(7))
            );

            e = new Event();

            e.set_start_time(c_start);
            e.set_end_time(c_end);
            e.set_name(matcher.group(8));
            e.add_speaker(matcher.group(9));
            e.add_location(matcher.group(10));
            e.set_uid(uid_prefix + (uid++));

            group.add_event(e);
         }
      }

      reader.close();
   }
}