arena: leaving the box during a fight (e.g. ender pearl glitch) counts as knocked out

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/Fight.java

@@ -237,11 +237,22 @@ final class Fight {
      * The player took lethal damage: out of the fight and back to the tribune.
      */
     void defeated(Player player) {
+        this.knockOut(player, Component.empty(), "ist ausgeschieden");
+    }
+
+    /**
+     * The player got out of the box, for example by glitching through a wall with an ender pearl.
+     */
+    void leftBox(Player player) {
+        this.knockOut(player, Component.text("Du hast die Arena verlassen", NamedTextColor.GRAY), "hat die Arena verlassen");
+    }
+
+    private void knockOut(Player player, Component subtitle, String what) {
         if(this.over || !this.eliminate(player.getUniqueId())) return;
-        player.showTitle(Title.title(Component.text("Ausgeschieden", NamedTextColor.RED), Component.empty()));
+        player.showTitle(Title.title(Component.text("Ausgeschieden", NamedTextColor.RED), subtitle));
         Style.play(player, Sound.BLOCK_BEACON_DEACTIVATE, 1f);
         this.arena.toTribune(player);
-        this.announceElimination(player.getUniqueId(), "ist ausgeschieden");
+        this.announceElimination(player.getUniqueId(), what);
         this.checkEnd();
     }
 

arena/src/main/java/eu/mhsl/craftattack/spawn/arena/appliances/arena/FightListener.java

@@ -12,6 +12,7 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
 import org.bukkit.event.player.PlayerRespawnEvent;
 import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.inventory.ItemStack;
@@ -94,4 +95,17 @@ class FightListener extends ApplianceListener<Arena> {
             event.setCancelled(true);
         }
     }
+
+    /**
+     * Whoever ends up outside the box anyway (ender pearl through a wall or corner) loses.
+     */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onMove(PlayerMoveEvent event) {
+        if(!event.hasChangedBlock()) return;
+        Player player = event.getPlayer();
+        if(this.getAppliance().state(player) != Arena.PlayerState.FIGHT || !this.isFighting(player)) return;
+        Fight fight = this.getAppliance().fightOf(player);
+        if(event.getTo().getWorld() == this.getAppliance().worlds().play() && fight.region().contains(event.getTo().getX(), event.getTo().getY(), event.getTo().getZ())) return;
+        fight.leftBox(player);
+    }
 }