add option to disable /ranks, make config clearer

src/main/java/sh/okx/rankup/Rankup.java

@@ -69,9 +69,11 @@ public class Rankup extends JavaPlugin {
       }
     });
 
+    if(config.getBoolean("ranks")) {
+      getCommand("ranks").setExecutor(new RankListCommand(this));
+    }
     getCommand("rankup").setExecutor(new RankupCommand(this));
     getCommand("rankup3").setExecutor(new InfoCommand(this));
-    getCommand("ranks").setExecutor(new RankListCommand(this));
     getServer().getPluginManager().registerEvents(new GuiListener(this), this);
   }
 
@@ -226,7 +228,7 @@ public class Rankup extends JavaPlugin {
     } else if (!rank.checkRequirements(player)) { // check if they can afford it
       MessageBuilder builder =
           getMessage(rank, Message.REQUIREMENTS_NOT_MET)
-              .replaceAll(player, rank);
+              .replaceAll(player, rank, rankups.nextRank(rank));
       if (economy != null) {
         double balance = economy.getBalance(player);
         double amount = rank.getRequirement("money").getAmount();
@@ -247,8 +249,8 @@ public class Rankup extends JavaPlugin {
     for(Requirement requirement : rank.getRequirements()) {
       replaceRequirements(builder, Variable.AMOUNT, requirement, () -> simpleFormat.format(requirement.getAmount()));
       replaceRequirements(builder, Variable.AMOUNT_NEEDED, requirement, () -> simpleFormat.format(requirement.getRemaining(player)));
-      replaceRequirements(builder, Variable.PERCENT_LEFT, requirement, () -> percentFormat.format((requirement.getRemaining(player) / requirement.getAmount()) * 100));
-      replaceRequirements(builder, Variable.PERCENT_DONE, requirement, () -> percentFormat.format((1-(requirement.getRemaining(player) / requirement.getAmount())) * 100));
+      replaceRequirements(builder, Variable.PERCENT_LEFT, requirement, () -> percentFormat.format(Math.max(0, (requirement.getRemaining(player) / requirement.getAmount()) * 100)));
+      replaceRequirements(builder, Variable.PERCENT_DONE, requirement, () -> percentFormat.format(Math.min(100, (1-(requirement.getRemaining(player) / requirement.getAmount())) * 100)));
     }
   }
 

src/main/java/sh/okx/rankup/commands/RankListCommand.java

@@ -27,15 +27,15 @@ public class RankListCommand implements CommandExecutor {
 
     sendHeaderFooter(sender, playerRank, Message.RANKS_HEADER);
 
-    int state = playerRank == null ? 2 : 0;
+    Message message = playerRank == null ? Message.RANKS_INCOMPLETE : Message.RANKS_COMPLETE;
     Rank rank = rankups.getFirstRank();
     do {
       Rank next = rankups.nextRank(rank);
       if(rank.equals(playerRank)) {
-        sendMessage(sender, 1, rank, next);
-        state = 2;
+        sendMessage(sender, Message.RANKS_CURRENT, rank, next);
+        message = Message.RANKS_COMPLETE;
       } else {
-        sendMessage(sender, state, rank, next);
+        sendMessage(sender, message, rank, next);
       }
       rank = next;
     } while(!rank.isLastRank());
@@ -55,20 +55,10 @@ public class RankListCommand implements CommandExecutor {
     builder.send(sender);
   }
 
-  private void sendMessage(CommandSender player, int state, Rank oldRank, Rank rank) {
-    if(state == 0) {
-      replaceRequirements(plugin.getMessage(oldRank, Message.RANKS_COMPLETE)
-          .replaceAll(player, oldRank, rank), player, oldRank)
-          .send(player);
-    } else if(state == 1) {
-      replaceRequirements(plugin.getMessage(oldRank, Message.RANKS_CURRENT)
-          .replaceAll(player, oldRank, rank), player, oldRank)
-          .send(player);
-    } else if(state == 2) {
-      replaceRequirements(plugin.getMessage(oldRank, Message.RANKS_INCOMPLETE)
-          .replaceAll(player, oldRank, rank), player, oldRank)
-          .send(player);
-    }
+  private void sendMessage(CommandSender player, Message message, Rank oldRank, Rank rank) {
+    replaceRequirements(plugin.getMessage(oldRank, message)
+        .replaceAll(player, oldRank, rank), player, oldRank)
+        .send(player);
   }
 
   private MessageBuilder replaceRequirements(MessageBuilder builder, CommandSender sender, Rank rank) {

src/main/java/sh/okx/rankup/commands/RankupCommand.java

@@ -53,9 +53,7 @@ public class RankupCommand implements CommandExecutor {
       case "text":
         confirming.put(player, System.currentTimeMillis());
         plugin.getMessage(rank, Message.CONFIRMATION)
-            .replace(Variable.PLAYER, player.getName())
-            .replace(Variable.RANK, rank.getRank())
-            .replace(Variable.RANK_NAME, rank.getName())
+            .replaceAll(player, rank, rankups.nextRank(rank))
             .send(player);
         break;
       case "gui":