tb insert command and new placeholders

src/main/java/me/roinujnosde/titansbattle/hooks/papi/TBExpansion.java

@@ -3,6 +3,7 @@
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
 import me.roinujnosde.titansbattle.TitansBattle;
+import me.roinujnosde.titansbattle.games.Game;
 import me.roinujnosde.titansbattle.managers.DatabaseManager;
 import me.roinujnosde.titansbattle.types.GameConfiguration;
 import me.roinujnosde.titansbattle.types.Group;
@@ -24,17 +25,21 @@ public class TBExpansion extends PlaceholderExpansion {
     private final TitansBattle plugin;
 
     private static final List<String> PLACEHOLDERS;
+    private static final Pattern PARTICIPANTS_SIZE;
+    private static final Pattern GROUPS_SIZE;
     private static final Pattern ARENA_IN_USE_PATTERN;
     private static final Pattern LAST_WINNER_GROUP_PATTERN;
     private static final Pattern LAST_WINNER_KILLER_PATTERN;
     private static final Pattern PREFIX_PATTERN;
 
     static {
+        PARTICIPANTS_SIZE = Pattern.compile("participants_size");
+        GROUPS_SIZE = Pattern.compile("groups_size");
         ARENA_IN_USE_PATTERN = Pattern.compile("arena_in_use_(?<arena>\\S+)");
         LAST_WINNER_GROUP_PATTERN = Pattern.compile("last_winner_group_(?<game>\\S+)");
         LAST_WINNER_KILLER_PATTERN = Pattern.compile("last_(?<type>winner|killer)_(?<game>\\S+)");
         PREFIX_PATTERN = Pattern.compile("(?<game>^\\S+)_(?<type>winner|killer)_prefix");
-        PLACEHOLDERS = Arrays.asList("%titansbattle_arena_in_use_<arena>%", "%titansbattle_last_winner_group_<game>%",
+        PLACEHOLDERS = Arrays.asList("%titansbattle_groups_size%" ,"%titansbattle_participants_size%" ,"%titansbattle_arena_in_use_<arena>%", "%titansbattle_last_winner_group_<game>%",
                 "%titansbattle_last_<killer|winner>_<game>%", "%titansbattle_<game>_<killer|winner>_prefix%",
                 "%titansbattle_group_total_victories%", "%titansbattle_total_kills%", "%titansbattle_total_deaths%");
     }
@@ -75,6 +80,21 @@ public boolean canRegister() {
 
     @Override
     public String onRequest(OfflinePlayer player, @NotNull String params) {
+
+        Matcher participantsSizeMatcher = PARTICIPANTS_SIZE.matcher(params);
+        if (participantsSizeMatcher.matches()) {
+            Optional<Game> currentGame = plugin.getGameManager().getCurrentGame();
+            return currentGame.map(game -> String.valueOf(game.getParticipants().size()))
+                    .orElse("0");
+        }
+
+        Matcher groupsSizeMatcher = GROUPS_SIZE.matcher(params);
+        if (groupsSizeMatcher.matches()) {
+            Optional<Game> currentGame = plugin.getGameManager().getCurrentGame();
+            return currentGame.map(game -> String.valueOf(game.getGroupParticipants().size()))
+                    .orElse("0");
+        }
+
         Matcher arenaInUse = ARENA_IN_USE_PATTERN.matcher(params);
         if (arenaInUse.find()) {
             String arenaName = arenaInUse.group("arena");