Add chat cool-down feature

src/main/java/wtf/beatrice/limbomanager/Cache.java

@@ -2,14 +2,18 @@ package wtf.beatrice.limbomanager;
 
 import org.bukkit.World;
 import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
 import wtf.beatrice.limbomanager.objects.Coordinates;
 import wtf.beatrice.limbomanager.objects.LocationCheckRunnable;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 
 public class Cache
 {
 
+    public static List<Player> chatCooldown = new ArrayList<>();
     public static final String worldName = "limbo";
     public static World limboWorld;
     public static final Coordinates baseCoords = new Coordinates(1000, 1000);

src/main/java/wtf/beatrice/limbomanager/LimboManager.java

@@ -35,6 +35,7 @@ public class LimboManager extends JavaPlugin {
         pluginManager.registerEvents(new CommandCanceller(), this);
         pluginManager.registerEvents(new RiskyBlocksHandler(), this);
         pluginManager.registerEvents(new WorldLoadHandler(), this);
+        pluginManager.registerEvents(new PlayerChatManager(), this);
 
         // no need to check if folder exists, it will just skip creation.
         getDataFolder().mkdirs();

src/main/java/wtf/beatrice/limbomanager/listeners/PlayerChatManager.java

@@ -0,0 +1,33 @@
+package wtf.beatrice.limbomanager.listeners;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
+import wtf.beatrice.limbomanager.Cache;
+import wtf.beatrice.limbomanager.LimboManager;
+
+public class PlayerChatManager implements Listener
+{
+
+    @EventHandler
+    public void onPlayerChat(AsyncPlayerChatEvent event)
+    {
+
+        int coolDown = Cache.getConfiguration().getInt("chat.cool-down", 3);
+        if(coolDown < 1) return; // disable this feature if cooldown is 0 or negative.
+
+        Player player = event.getPlayer();
+
+        if(Cache.chatCooldown.contains(player))
+        {
+            player.sendMessage("Chat is limited in this server. Please wait.");
+            event.setCancelled(true);
+            return;
+        }
+
+        Cache.chatCooldown.add(player);
+        Bukkit.getScheduler().runTaskLater(LimboManager.getInstance(), () -> Cache.chatCooldown.remove(player), 20L * coolDown);
+    }
+}

src/main/resources/config.yml

@@ -8,4 +8,6 @@ island:
     y: 20.0
     z: 0.0
     yaw: 0.0
-    pitch: 0.0
+    pitch: 0.0
+chat:
+  cool-down: 3