import java.util.ArrayList;
import java.util.List;

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

public class Event
{
   private final List<String> locations;
   private final List<String> speakers;
   private final List<String> attendees;
   private String name;
   private String category;
   private String uid;
   private String description;
   private java.util.Calendar start_time;
   private java.util.Calendar end_time;
   private java.util.Calendar creation_time;

   public Event ()
   {
      locations = new ArrayList<String>();
      speakers = new ArrayList<String>();
      attendees = new ArrayList<String>();

      name = null;
      category = null;
      description = null;
      start_time = null;
      end_time = null;

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

   public String get_name ()
   {
      return name;
   }

   public void set_name (final String val)
   {
      if (val != null)
      {
         name =
            val.trim
            (
            ).replaceAll
            (
               "(?<!\\\\),",
               "\\\\,"
            ).replaceAll
            (
               "(?<!\\\\);",
               "\\\\;"
            );
      }
   }

   public void set_description (final String val)
   {
      if (val != null)
      {
         description =
            val.replaceAll
            (
               "(?<!\\\\),",
               "\\\\,"
            ).replaceAll
            (
               "(?<!\\\\);",
               "\\\\;"
            );
      }
   }

   public void set_category (final String val)
   {
      if (val != null)
      {
         category = val;
      }
   }

   public void set_uid (final String val)
   {
      if (val != null)
      {
         uid = val;
      }
   }

   public void set_start_time (final java.util.Calendar val)
   {
      if (val != null)
      {
         start_time = val;
      }
   }

   public void set_end_time (final java.util.Calendar val)
   {
      if (val != null)
      {
         end_time = val;
      }
   }

   public void add_location (final String str)
   {
      locations.add(str);
   }

   public void add_speaker (final String str)
   {
      speakers.add(str);
   }

   public void add_attendee (final String str)
   {
      attendees.add(str);
   }

   public String toString()
   {
      final StringBuilder sb;
      final String creation_time_str;

      sb = new StringBuilder();

      creation_time_str = get_time(creation_time);

      sb.append("BEGIN:VEVENT");

      sb.append("\r\nSUMMARY:");

      if (category != null)
      {
         sb.append("[");
         sb.append(category);
         sb.append("] ");
      }

      if (name != null)
      {
         sb.append(name);
      }

      if (!locations.isEmpty())
      {
         sb.append("\r\nLOCATION:");

         for (final String s: locations)
         {
            sb.append(s);
            sb.append("\\n");
         }

         sb.delete(sb.length() - 2, sb.length());
      }

      sb.append("\r\nDESCRIPTION:");

      if (description != null)
      {
         sb.append(description);

         if
         (
            !speakers.isEmpty()
            || !attendees.isEmpty()
         )
         {
            sb.append("\\n");
         }
      }
      if (!speakers.isEmpty())
      {

         for (final String s: speakers)
         {
            sb.append("[Speaker] ");
            sb.append(s);
            sb.append("\\n");
         }

         if (attendees.isEmpty())
         {
            sb.delete(sb.length() - 2, sb.length());
         }
      }

      if (!attendees.isEmpty())
      {

         for (final String s: attendees)
         {
            sb.append("[Attendee] ");
            sb.append(s);
            sb.append("\\n");
         }

         sb.delete(sb.length() - 2, sb.length());
      }


      sb.append("\r\nUID:");
      sb.append(uid);

      sb.append("\r\nCREATED:");
      sb.append(creation_time_str);

      sb.append("\r\nLAST-MODIFIED:");
      sb.append(creation_time_str);

      sb.append("\r\nDTSTART:");
      sb.append(get_time(start_time));

      sb.append("\r\nDTEND:");
      sb.append(get_time(end_time));

      sb.append("\r\nSTATUS:CONFIRMED");

      sb.append("\r\nSEQUENCE:0");

      sb.append("\r\nTRANSP:OPAQUE");

      sb.append("\r\nEND:VEVENT");

      return sb.toString();
   }

   private String get_time (final java.util.Calendar cal)
   {
      final StringBuilder sb;
      int val;

      sb = new StringBuilder();

      sb.append(cal.get(java.util.Calendar.YEAR));

      val = cal.get(java.util.Calendar.MONTH) + 1; /* Java... don't ask... */

      if (val < 10)
      {
         sb.append("0");
      }

      sb.append(val);

      append_two_digit(sb, cal, java.util.Calendar.DAY_OF_MONTH);

      sb.append("T");

      append_two_digit(sb, cal, java.util.Calendar.HOUR_OF_DAY);
      append_two_digit(sb, cal, java.util.Calendar.MINUTE);

      sb.append("00");

      return sb.toString();
   }

   private void append_two_digit
   (
      final StringBuilder sb,
      final java.util.Calendar cal,
      final int val_id
   )
   {
      final int val;

      val = cal.get(val_id);

      if (val < 10)
      {
         sb.append("0");
      }

      sb.append(val);
   }
}