Added xp calc command

src/main/java/com/alttd/playerutils/commands/PlayerUtilsCommand.java

@@ -2,6 +2,7 @@ package com.alttd.playerutils.commands;
 
 import com.alttd.playerutils.PlayerUtils;
 import com.alttd.playerutils.commands.playerutils_subcommands.Glow;
+import com.alttd.playerutils.commands.playerutils_subcommands.XPCalc;
 import com.alttd.playerutils.commands.playerutils_subcommands.XPCheque;
 import com.alttd.playerutils.config.Messages;
 import com.alttd.playerutils.util.Logger;
@@ -30,7 +31,8 @@ public class PlayerUtilsCommand implements CommandExecutor, TabExecutor {
 
         subCommands = Arrays.asList(
                 new Glow(logger),
-                new XPCheque(playerUtils)
+                new XPCheque(playerUtils),
+                new XPCalc()
         );
     }
 

src/main/java/com/alttd/playerutils/commands/playerutils_subcommands/XPCalc.java

@@ -0,0 +1,73 @@
+package com.alttd.playerutils.commands.playerutils_subcommands;
+
+import com.alttd.playerutils.commands.SubCommand;
+import com.alttd.playerutils.config.Messages;
+import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.Optional;
+
+public class XPCalc extends SubCommand {
+    @Override
+    public boolean onCommand(CommandSender commandSender, String[] args) {
+        if (args.length != 3) {
+            return false;
+        }
+        Optional<Integer> optionalFrom = getInt(args[1]);
+        Optional<Integer> optionalTo = getInt(args[2]);
+
+        if (optionalFrom.isEmpty() || optionalTo.isEmpty())
+            return false;
+
+        long totalXpNeeded = 0;
+        int startingLevel = optionalFrom.get();
+        int endingLevel = optionalTo.get();
+        if (endingLevel < startingLevel) {
+            int tmp = startingLevel;
+            startingLevel = endingLevel;
+            endingLevel = tmp;
+        }
+
+        while (startingLevel < endingLevel) {
+            totalXpNeeded += getExpToNext(startingLevel);
+            startingLevel++;
+        }
+
+        commandSender.sendMiniMessage(Messages.XP_CALC.XP_NEEDED, Placeholder.parsed("xp_needed", String.valueOf(totalXpNeeded)));
+        return true;
+    }
+
+    @Override
+    public String getName() {
+        return "xpcalc";
+    }
+
+    @Override
+    public List<String> getTabComplete(CommandSender commandSender, String[] args) {
+        return List.of();
+    }
+
+    @Override
+    public String getHelpMessage() {
+        return Messages.HELP.XP_CALC;
+    }
+
+    private Optional<Integer> getInt(String arg) {
+        try {
+            return Optional.of(Integer.parseInt(arg));
+        } catch (NumberFormatException e) {
+            return Optional.empty();
+        }
+    }
+
+    public int getExpToNext(int level) {
+        if (level <= 15) {
+            return 2 * level + 7;
+        } else if (level <= 30) {
+            return 5 * level - 38;
+        } else {
+            return 9 * level - 158;
+        }
+    }
+}

src/main/java/com/alttd/playerutils/config/Messages.java

@@ -10,7 +10,7 @@ public class Messages extends AbstractConfig {
     private final Logger logger;
 
     Messages(PlayerUtils playerUtils, Logger logger) {
-        super(playerUtils, "config.yml", logger);
+        super(playerUtils, "messages.yml", logger);
         this.logger = logger;
     }
 
@@ -26,6 +26,7 @@ public class Messages extends AbstractConfig {
         public static String HELP_MESSAGE = "<green>Show this menu: <gold>/pu help</gold></green>";
         public static String GLOW = "<green>Glow in a specified color: <gold>/pu glow <color></gold></green>";
         public static String XP_CHEQUE = "<green>Create an xp cheque: <gold>/pu xpcheque <amount></gold></green>";
+        public static String XP_CALC = "<green>Calculate the amount of xp between levels: <gold>/pu xpcalc <from> <to></gold></green>";
 
         @SuppressWarnings("unused")
         private static void load() {
@@ -33,6 +34,7 @@ public class Messages extends AbstractConfig {
             HELP_MESSAGE = config.getString(prefix, "help", HELP_MESSAGE);
             GLOW = config.getString(prefix, "glow", GLOW);
             XP_CHEQUE = config.getString(prefix, "xp-cheque", XP_CHEQUE);
+            XP_CALC = config.getString(prefix, "xp-calc", XP_CALC);
         }
     }
 
@@ -84,4 +86,15 @@ public class Messages extends AbstractConfig {
             LORE = config.getStringList(prefix, "lore", LORE);
         }
     }
+
+    public static class XP_CALC {
+        private static final String prefix = "pu-command.xp-cheque.";
+
+        public static String XP_NEEDED = "<green>Xp needed <gold><xp_needed></gold>.</green>";
+
+        @SuppressWarnings("unused")
+        private static void load() {
+            XP_NEEDED = config.getString(prefix, "xp-needed", XP_NEEDED);
+        }
+    }
 }