src/main/java/buttondevteam/chat/commands/ucmds/NColorCommand.java

@@ -58,16 +58,16 @@ public class NColorCommand extends UCommandBase {
 			player.sendMessage("§cYour town doesn't have a color set. The town mayor can set it using /u towncolor.");
 			return true;
 		}
-		if (nameparts.length < towncolors.length) {
+		if (nameparts.length < towncolors.length + 1) { //+1: Nation color
-            player.sendMessage("§cYou need more vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1) + ")");
+			player.sendMessage("§cYou need more vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1 + 1) + ")"); //Nation color
 			return true;
 		}
-		if (nameparts.length > towncolors.length * 2) {
+		if (nameparts.length > (towncolors.length + 1) * 2) {
-            player.sendMessage("§cYou have waay too many vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1) + ")");
+			player.sendMessage("§cYou have waay too many vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1 + 1) + ")");
 			return true;
 		}
-		if (nameparts.length > towncolors.length) {
+		if (nameparts.length > towncolors.length + 1) {
-            player.sendMessage("§cYou have too many vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1) + ")");
+			player.sendMessage("§cYou have too many vertical lines (|) or colons (:) in your name. (Should have " + (towncolors.length - 1 + 1) + ")");
 			return true;
 		}
 		ChatPlayer.getPlayer(player.getUniqueId(), ChatPlayer.class).NameColorLocations()

src/main/java/buttondevteam/chat/commands/ucmds/admin/NationColorCommand.java

@@ -2,6 +2,7 @@ package buttondevteam.chat.commands.ucmds.admin;
 
 import buttondevteam.chat.PluginMain;
 import buttondevteam.chat.listener.TownyListener;
+import buttondevteam.lib.chat.Color;
 import com.palmergames.bukkit.towny.object.Nation;
 import com.palmergames.bukkit.towny.object.Town;
 import lombok.val;
@@ -37,6 +38,14 @@ public class NationColorCommand extends AdminCommandBase {
 		}
 		val c = TownColorCommand.getColorOrSendError(args[1], sender);
 		if (!c.isPresent()) return true;
+		if (!c.get().getName().equals(Color.White.getName())) { //Default nation color
+			for (val nc : PluginMain.NationColor.values()) {
+				if (nc.getName().equals(c.get().getName())) {
+					sender.sendMessage("§cAnother nation already uses this color!");
+					return true;
+				}
+			}
+		}
 		PluginMain.NationColor.put(args[0].toLowerCase(), c.get());
 		Bukkit.getScheduler().runTaskAsynchronously(PluginMain.Instance, () -> {
 			for (Town t : nation.getTowns())

src/main/java/buttondevteam/chat/commands/ucmds/admin/TownColorCommand.java

@@ -10,6 +10,7 @@ import org.bukkit.command.CommandSender;
 import org.dynmap.towny.DynmapTownyPlugin;
 
 import java.util.Arrays;
+import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
@@ -46,6 +47,33 @@ public class TownColorCommand extends AdminCommandBase {
                 return true;
 		    clrs[i - 1] = c.get();
         }
+	    for (Map.Entry<String, Color[]> other : PluginMain.TownColors.entrySet()) {
+		    Color nc, tnc;
+		    try {
+			    nc = PluginMain.NationColor.get(PluginMain.TU.getTownsMap().get(other.getKey()).getNation().getName().toLowerCase());
+		    } catch (Exception e) { //Too lazy for lots of null-checks and it may throw exceptions anyways
+			    nc = null;
+		    }
+		    if (nc == null) nc = Color.White; //Default nation color
+		    try {
+			    tnc = PluginMain.NationColor.get(targetTown.getNation().getName().toLowerCase());
+		    } catch (Exception e) {
+			    tnc = null;
+		    }
+		    if (tnc == null) tnc = Color.White; //Default nation color - TODO: Make configurable
+		    if (nc.getName().equals(tnc.getName())) {
+			    int C = 0;
+			    if (clrs.length == other.getValue().length)
+				    for (int i = 0; i < clrs.length; i++)
+					    if (clrs[i].getName().equals(other.getValue()[i].getName()))
+						    C++;
+					    else break;
+			    if (C == clrs.length) {
+				    sender.sendMessage("§cThis town color combination is already used!");
+				    return true;
+			    }
+		    }
+	    }
         PluginMain.TownColors.put(args[0].toLowerCase(), clrs);
 	    TownyListener.updateTownMembers(targetTown);