Add LuckPerms rank price multipliers

pom.xml

@@ -42,6 +42,12 @@
       <version>1.7.1</version>
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>net.luckperms</groupId>
+      <artifactId>api</artifactId>
+      <version>5.4</version>
+      <scope>provided</scope>
+    </dependency>
     <dependency>
       <groupId>com.zaxxer</groupId>
       <artifactId>HikariCP</artifactId>

src/main/java/com/yourorg/servershop/ServerShopPlugin.java

@@ -22,6 +22,7 @@ public final class ServerShopPlugin extends JavaPlugin {
     private ShopService shopService;
     private DynamicPricingManager dynamic;
     private CategorySettings categorySettings;
+    private RankMultipliers rankMultipliers;
 
     @Override public void onEnable() {
         saveDefaultConfig();
@@ -33,6 +34,7 @@ public final class ServerShopPlugin extends JavaPlugin {
             return;
         }
         this.categorySettings = new CategorySettings(this);
+        this.rankMultipliers = new RankMultipliers(this);
         this.catalog = new Catalog(this); catalog.reload();
         this.weekly = new WeeklyShopManager(this);
         this.logger = new LoggerManager(this);
@@ -79,4 +81,5 @@ public String prefixed(String msg) {
     public ShopService shop() { return shopService; }
     public DynamicPricingManager dynamic() { return dynamic; }
     public CategorySettings categorySettings() { return categorySettings; }
+    public RankMultipliers rankMultipliers() { return rankMultipliers; }
 }

src/main/java/com/yourorg/servershop/commands/AdminCommand.java

@@ -17,7 +17,12 @@ public boolean handle(CommandSender sender, String[] args) {
         switch (args[1].toLowerCase()) {
             case "category": return handleCategory(sender, slice(args, 2));
             case "import": return handleImport(sender);
-            case "reload": plugin.reloadConfig(); plugin.catalog().reload(); sender.sendMessage(plugin.prefixed("Reloaded.")); return true;
+            case "reload":
+                plugin.reloadConfig();
+                plugin.catalog().reload();
+                plugin.rankMultipliers().reload();
+                sender.sendMessage(plugin.prefixed("Reloaded."));
+                return true;
             default: help(sender); return true;
         }
     }

src/main/java/com/yourorg/servershop/commands/ShopCommand.java

@@ -51,7 +51,7 @@ private boolean search(CommandSender sender, String[] args) {
             for (int i=start;i<end;i++) {
                 Material m = enabled.get(i);
                 var e = plugin.catalog().get(m).orElse(null); if (e == null) continue;
-                double price = plugin.shop().priceBuy(m);
+                double price = sender instanceof Player p ? plugin.shop().priceBuy(p, m) : plugin.shop().priceBuy(m);
                 sender.sendMessage(" - "+m.name()+": $"+String.format("%.2f", price));
             }
         }
@@ -64,7 +64,7 @@ private boolean price(CommandSender sender, String[] args) {
         if (mat == null) { sender.sendMessage(plugin.prefixed(msg("unknown-material").replace("%material%", args[1]))); return true; }
         Optional<ItemEntry> opt = plugin.catalog().get(mat);
         if (opt.isEmpty() || !opt.get().canBuy()) { sender.sendMessage(plugin.prefixed(msg("not-for-sale").replace("%material%", mat.name()))); return true; }
-        double price = plugin.shop().priceBuy(mat);
+        double price = sender instanceof Player p ? plugin.shop().priceBuy(p, mat) : plugin.shop().priceBuy(mat);
         sender.sendMessage(plugin.prefixed(mat.name() + ": $" + String.format("%.2f", price)));
         return true;
     }

src/main/java/com/yourorg/servershop/config/RankMultipliers.java

@@ -0,0 +1,65 @@
+package com.yourorg.servershop.config;
+
+import com.yourorg.servershop.ServerShopPlugin;
+import net.luckperms.api.LuckPerms;
+import net.luckperms.api.LuckPermsProvider;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.entity.Player;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Handles per-rank buy/sell multipliers via LuckPerms groups.
+ * If LuckPerms is not present, all multipliers default to 1.0.
+ */
+public final class RankMultipliers {
+    private final ServerShopPlugin plugin;
+    private LuckPerms luckPerms;
+    private final Map<String, Multiplier> multipliers = new HashMap<>();
+
+    public RankMultipliers(ServerShopPlugin plugin) {
+        this.plugin = plugin;
+        // Attempt to hook into LuckPerms if present
+        try {
+            if (plugin.getServer().getPluginManager().getPlugin("LuckPerms") != null) {
+                this.luckPerms = LuckPermsProvider.get();
+            }
+        } catch (Exception ignored) {}
+        reload();
+    }
+
+    /** Reload multipliers from config. */
+    public void reload() {
+        multipliers.clear();
+        ConfigurationSection sec = plugin.getConfig().getConfigurationSection("rankMultipliers");
+        if (sec != null) {
+            for (String key : sec.getKeys(false)) {
+                double buy = sec.getDouble(key + ".buy", 1.0);
+                double sell = sec.getDouble(key + ".sell", 1.0);
+                multipliers.put(key.toLowerCase(), new Multiplier(buy, sell));
+            }
+        }
+    }
+
+    public double buyMultiplier(Player p) {
+        Multiplier m = multipliers.get(groupOf(p));
+        return m != null ? m.buy : 1.0;
+    }
+
+    public double sellMultiplier(Player p) {
+        Multiplier m = multipliers.get(groupOf(p));
+        return m != null ? m.sell : 1.0;
+    }
+
+    private String groupOf(Player p) {
+        if (luckPerms != null) {
+            var user = luckPerms.getPlayerAdapter(Player.class).getUser(p);
+            if (user != null) return user.getPrimaryGroup().toLowerCase();
+        }
+        return "default";
+    }
+
+    private record Multiplier(double buy, double sell) {}
+}
+

src/main/java/com/yourorg/servershop/gui/CategoryMenu.java

@@ -12,7 +12,7 @@ public final class CategoryMenu implements MenuView {
     private final ServerShopPlugin plugin;
     public CategoryMenu(ServerShopPlugin plugin) { this.plugin = plugin; }
 
-    @Override public Inventory build() {
+    @Override public Inventory build(Player viewer) {
         int rows = Math.max(1, plugin.getConfig().getInt("gui.rows.categories", 3));
         Inventory inv = Bukkit.createInventory(null, rows*9, title());
         int slot = 10;

src/main/java/com/yourorg/servershop/gui/ItemsMenu.java

@@ -13,14 +13,14 @@ public final class ItemsMenu implements MenuView {
     private final ServerShopPlugin plugin; private final String category;
     public ItemsMenu(ServerShopPlugin plugin, String category) { this.plugin = plugin; this.category = category; }
 
-    @Override public Inventory build() {
+    @Override public Inventory build(Player viewer) {
         int rows = Math.max(1, plugin.getConfig().getInt("gui.rows.items", 6));
         Inventory inv = Bukkit.createInventory(null, rows*9, title());
         var mats = plugin.catalog().categories().getOrDefault(category, List.of());
         int i = 10;
         for (var m : mats) {
-            double buy = plugin.shop().priceBuy(m);
-            double sell = plugin.shop().priceSell(m);
+            double buy = plugin.shop().priceBuy(viewer, m);
+            double sell = plugin.shop().priceSell(viewer, m);
             inv.setItem(i, GuiUtil.item(m.isItem() ? m : Material.BOOK, "&e"+m.name(), GuiUtil.lore(
                     "&7Buy: &a$"+String.format("%.2f", buy),
                     "&7Sell: &6$"+(sell>0?String.format("%.2f", sell):"-"),
@@ -40,7 +40,7 @@ public final class ItemsMenu implements MenuView {
         var m = org.bukkit.Material.matchMaterial(org.bukkit.ChatColor.stripColor(it.getItemMeta().getDisplayName()));
         if (m == null) return;
         if (e.isRightClick()) {
-            double buy = plugin.shop().priceBuy(m);
+            double buy = plugin.shop().priceBuy(p, m);
             p.sendMessage(plugin.prefixed(m.name()+": $"+String.format("%.2f", buy)));
             return;
         }

src/main/java/com/yourorg/servershop/gui/MenuManager.java

@@ -22,7 +22,7 @@ public final class MenuManager implements Listener {
     public void openSearch(Player p, String query, java.util.List<org.bukkit.Material> results, int page) { open(p, new SearchMenu(plugin, query, results, page)); }
 
     private void open(Player p, MenuView view) {
-        Inventory inv = view.build();
+        Inventory inv = view.build(p);
         open.put(p.getUniqueId(), view);
         p.openInventory(inv);
     }

src/main/java/com/yourorg/servershop/gui/MenuView.java

@@ -1,10 +1,11 @@
 package com.yourorg.servershop.gui;
 
+import org.bukkit.entity.Player;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.inventory.Inventory;
 
 public interface MenuView {
-    Inventory build();
+    Inventory build(Player viewer);
     void onClick(InventoryClickEvent e);
     String title();
 }

src/main/java/com/yourorg/servershop/gui/SearchMenu.java

@@ -20,16 +20,16 @@ public SearchMenu(ServerShopPlugin plugin, String query, List<Material> results,
         this.plugin = plugin; this.query = query; this.results = results; this.page = Math.max(0, page);
     }
 
-    @Override public Inventory build() {
+    @Override public Inventory build(Player viewer) {
         Inventory inv = Bukkit.createInventory(null, 6*9, title());
         int start = page * PAGE_SIZE;
         int end = Math.min(results.size(), start + PAGE_SIZE);
         int i = 10;
         for (int idx = start; idx < end; idx++) {
             Material m = results.get(idx);
             if (!plugin.categorySettings().isEnabled(plugin.catalog().categoryOf(m))) continue;
-            double buy = plugin.shop().priceBuy(m);
-            double sell = plugin.shop().priceSell(m);
+            double buy = plugin.shop().priceBuy(viewer, m);
+            double sell = plugin.shop().priceSell(viewer, m);
             inv.setItem(i, GuiUtil.item(m.isItem()?m:Material.PAPER, "&e"+m.name(), GuiUtil.lore(
                     "&7Buy: &a$"+String.format("%.2f", buy),
                     "&7Sell: &6$"+(sell>0?String.format("%.2f", sell):"-"),
@@ -51,7 +51,7 @@ public SearchMenu(ServerShopPlugin plugin, String query, List<Material> results,
         if (name.equalsIgnoreCase("Next Page")) { plugin.menus().openSearch(p, query, results, page+1); return; }
         var m = org.bukkit.Material.matchMaterial(org.bukkit.ChatColor.stripColor(it.getItemMeta().getDisplayName()));
         if (m == null) return;
-        if (e.isRightClick()) { double buy = plugin.shop().priceBuy(m); p.sendMessage(plugin.prefixed(m.name()+": $"+String.format("%.2f", buy))); return; }
+        if (e.isRightClick()) { double buy = plugin.shop().priceBuy(p, m); p.sendMessage(plugin.prefixed(m.name()+": $"+String.format("%.2f", buy))); return; }
         int qty = e.isShiftClick() ? 16 : 1;
         plugin.shop().buy(p, m, qty).ifPresent(err -> p.sendMessage(plugin.prefixed(err)));
     }

src/main/java/com/yourorg/servershop/gui/SellMenu.java

@@ -14,11 +14,15 @@ public final class SellMenu implements MenuView {
     private final ServerShopPlugin plugin;
     public SellMenu(ServerShopPlugin plugin) { this.plugin = plugin; }
 
-    @Override public Inventory build() {
-        return Bukkit.createInventory(null, 6*9, title());
+    @Override
+    public Inventory build(Player viewer) {
+        Inventory inv = Bukkit.createInventory(null, 6*9, title());
+        populate(inv, viewer);
+        return inv;
     }
 
-    @Override public void onClick(InventoryClickEvent e) {
+    @Override
+    public void onClick(InventoryClickEvent e) {
         if (!(e.getWhoClicked() instanceof Player p)) return;
         var it = e.getCurrentItem(); if (it == null) return;
         var m = it.getType(); if (m == Material.AIR) return;
@@ -30,22 +34,30 @@ public final class SellMenu implements MenuView {
         refresh(p);
     }
 
-    @Override public String title() { return plugin.getConfig().getString("gui.titles.sell", "Sell Items"); }
+    @Override
+    public String title() { return plugin.getConfig().getString("gui.titles.sell", "Sell Items"); }
 
     public void refresh(Player p) {
-        Inventory inv = p.getOpenInventory().getTopInventory();
+        populate(p.getOpenInventory().getTopInventory(), p);
+    }
+
+    private void populate(Inventory inv, Player p) {
         inv.clear();
-        java.util.Map<Material, Integer> map = new java.util.TreeMap<>(java.util.Comparator.comparing(Enum::name));
+        Map<Material, Integer> map = new TreeMap<>(Comparator.comparing(Enum::name));
         for (ItemStack s : p.getInventory().getContents()) {
-            if (s == null) continue; var m = s.getType();
-            var e = plugin.catalog().get(m).orElse(null); if (e == null || !e.canSell()) continue;
+            if (s == null) continue;
+            var m = s.getType();
+            var e = plugin.catalog().get(m).orElse(null);
+            if (e == null || !e.canSell()) continue;
             map.put(m, map.getOrDefault(m, 0) + s.getAmount());
         }
         int i = 10;
         for (var ent : map.entrySet()) {
-            double unit = plugin.shop().priceSell(ent.getKey());
+            double unit = plugin.shop().priceSell(p, ent.getKey());
             inv.setItem(i, GuiUtil.item(ent.getKey().isItem()?ent.getKey():Material.PAPER, "&a"+ent.getKey().name(), GuiUtil.lore(
-                    "&7Unit: &6$"+String.format("%.2f", unit), "&7You have: &e"+ent.getValue(), "&8Click: sell stack  |  Shift: sell all of this")));
+                    "&7Unit: &6$"+String.format("%.2f", unit),
+                    "&7You have: &e"+ent.getValue(),
+                    "&8Click: sell stack  |  Shift:sell all of this")));
             i += (i % 9 == 7) ? 3 : 1;
         }
         inv.setItem(6*9-5, GuiUtil.item(Material.BARRIER, "&cSell All", GuiUtil.lore("&7Sells every sellable item")));
@@ -55,10 +67,12 @@ private void sellAll(Player p) {
         double total = 0.0; int stacks = 0;
         for (int i = 0; i < p.getInventory().getSize(); i++) {
             ItemStack s = p.getInventory().getItem(i);
-            if (s == null) continue; var m = s.getType();
-            var e = plugin.catalog().get(m).orElse(null); if (e == null || !e.canSell()) continue;
+            if (s == null) continue;
+            var m = s.getType();
+            var e = plugin.catalog().get(m).orElse(null);
+            if (e == null || !e.canSell()) continue;
             int qty = s.getAmount();
-            double unit = plugin.shop().priceSell(m);
+            double unit = plugin.shop().priceSell(p, m);
             double amount = unit * qty;
             total += amount; stacks++;
             p.getInventory().setItem(i, null);

src/main/java/com/yourorg/servershop/gui/WeeklyMenu.java

@@ -11,11 +11,11 @@ public final class WeeklyMenu implements MenuView {
     private final ServerShopPlugin plugin;
     public WeeklyMenu(ServerShopPlugin plugin) { this.plugin = plugin; }
 
-    @Override public Inventory build() {
+    @Override public Inventory build(Player viewer) {
         Inventory inv = Bukkit.createInventory(null, 6*9, title());
         int i = 10;
         for (var m : plugin.weekly().currentPicks()) {
-            double price = plugin.shop().priceBuy(m);
+            double price = plugin.shop().priceBuy(viewer, m);
             inv.setItem(i, GuiUtil.item(m.isItem()?m:Material.BOOK, "&b"+m.name(), GuiUtil.lore(
                     "&7Weekly price: &a$"+String.format("%.2f", price),
                     "&8Left-click: buy 1  |  Shift-left: buy 16")));

src/main/java/com/yourorg/servershop/shop/ShopService.java

@@ -20,7 +20,7 @@ public Optional<String> buy(Player p, Material mat, int qty) {
         String cat = plugin.catalog().categoryOf(mat);
         if (!plugin.categorySettings().isEnabled(cat)) return Optional.of("Category disabled: "+cat);
         double unit = plugin.dynamic().buyPrice(mat, opt.get().buyPrice());
-        double total = unit * qty;
+        double total = unit * qty * plugin.rankMultipliers().buyMultiplier(p);
         var econ = plugin.economy();
         if (econ.getBalance(p) + 1e-9 < total) {
             double need = Math.max(0, total - econ.getBalance(p));
@@ -45,7 +45,7 @@ public Optional<String> sell(Player p, Material mat, int qty) {
         int removed = removeFromInventory(p, mat, qty);
         if (removed <= 0) return Optional.of("You don't have that.");
         double unit = plugin.dynamic().sellPrice(mat, opt.get().sellPrice());
-        double total = unit * removed;
+        double total = unit * removed * plugin.rankMultipliers().sellMultiplier(p);
         plugin.economy().depositPlayer(p, total);
         plugin.dynamic().adjustOnSell(mat, removed);
         plugin.logger().logAsync(new Transaction(Instant.now(), p.getName(), Transaction.Type.SELL, mat, removed, total));
@@ -58,11 +58,21 @@ public double priceBuy(Material mat) {
         return plugin.dynamic().buyPrice(mat, e.buyPrice());
     }
 
+    public double priceBuy(Player p, Material mat) {
+        double base = priceBuy(mat);
+        return base < 0 ? base : base * plugin.rankMultipliers().buyMultiplier(p);
+    }
+
     public double priceSell(Material mat) {
         var e = plugin.catalog().get(mat).orElse(null); if (e == null || !e.canSell()) return -1;
         return plugin.dynamic().sellPrice(mat, e.sellPrice());
     }
 
+    public double priceSell(Player p, Material mat) {
+        double base = priceSell(mat);
+        return base < 0 ? base : base * plugin.rankMultipliers().sellMultiplier(p);
+    }
+
     private int removeFromInventory(Player p, Material mat, int qty) {
         int remaining = qty;
         for (int i = 0; i < p.getInventory().getSize(); i++) {

src/main/resources/config.yml

@@ -45,3 +45,10 @@ gui:
     categories: 3
     items: 6
     sell: 6
+rankMultipliers:
+  default:
+    buy: 1.0
+    sell: 1.0
+  VIP:
+    buy: 0.95
+    sell: 1.05

src/main/resources/plugin.yml

@@ -3,6 +3,7 @@ main: com.yourorg.servershop.ServerShopPlugin
 version: 1.2.0
 api-version: '1.20'
 depend: [Vault]
+softdepend: [LuckPerms]
 author: yourorg
 description: Dynamic server shop with GUIs, MySQL logging, importer, and per-item dynamic pricing.
 commands: