Added a discount module

com/Acrobot/ChestShop/ChestShop.java

@@ -164,6 +164,7 @@ public class ChestShop extends JavaPlugin {
         registerEvent(new SpamClickProtector(Config.getInteger(SHOP_INTERACTION_INTERVAL)));
 
         registerEvent(new RestrictedSign());
+        registerEvent(new DiscountModule());
 
         if (Config.getBoolean(ALLOW_PARTIAL_TRANSACTIONS)) {
             registerEvent(new PartialTransactionModule());

com/Acrobot/ChestShop/Listeners/PostTransaction/EmptyShopDeleter.java

@@ -3,7 +3,10 @@ package com.Acrobot.ChestShop.Listeners.PostTransaction;
 import com.Acrobot.ChestShop.Config.Config;
 import com.Acrobot.ChestShop.Config.Property;
 import com.Acrobot.ChestShop.Events.TransactionEvent;
+import com.Acrobot.ChestShop.Signs.ChestShopSign;
+import com.Acrobot.ChestShop.Utils.uBlock;
 import org.bukkit.Material;
+import org.bukkit.block.Chest;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.inventory.Inventory;
@@ -20,6 +23,11 @@ public class EmptyShopDeleter implements Listener {
         }
 
         if (shopShouldBeRemoved(event.getOwnerInventory())) {
+            if (!ChestShopSign.isAdminShop(event.getSign())) {
+                Chest connectedChest = uBlock.findConnectedChest(event.getSign());
+                connectedChest.getBlock().setType(Material.AIR);
+            }
+
             event.getSign().getBlock().setType(Material.AIR);
             event.getOwnerInventory().addItem(new ItemStack(Material.SIGN, 1));
         }

com/Acrobot/ChestShop/Listeners/PreTransaction/DiscountModule.java

@@ -0,0 +1,65 @@
+package com.Acrobot.ChestShop.Listeners.PreTransaction;
+
+import com.Acrobot.Breeze.Utils.PriceUtil;
+import com.Acrobot.ChestShop.ChestShop;
+import com.Acrobot.ChestShop.Config.BreezeConfiguration;
+import com.Acrobot.ChestShop.Containers.AdminInventory;
+import com.Acrobot.ChestShop.Events.PreTransactionEvent;
+import com.Acrobot.ChestShop.Permission;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+
+import java.io.File;
+import java.util.HashSet;
+import java.util.Set;
+
+import static com.Acrobot.Breeze.Utils.PriceUtil.NO_PRICE;
+import static com.Acrobot.ChestShop.Events.TransactionEvent.TransactionType.BUY;
+import static com.Acrobot.ChestShop.Signs.ChestShopSign.PRICE_LINE;
+
+/**
+ * @author Acrobot
+ */
+public class DiscountModule implements Listener {
+    private BreezeConfiguration config;
+    private Set<String> groupList = new HashSet<String>();
+
+    public DiscountModule() {
+        config = BreezeConfiguration.loadConfiguration(new File(ChestShop.getFolder(), "discounts.yml"));
+
+        config.options().header("This file is for discount management. You are able to do that:\n" +
+                "group1: 75\n" +
+                "That means that the person with ChestShop.discount.group1 permission will pay only 75% of the price. \n" +
+                "For example, if the price is 100 dollars, the player pays only 75 dollars.\n" +
+                "(Only works in buy-only Admin Shops!)");
+
+        config.reload();
+
+        groupList = config.getKeys(false);
+    }
+
+    @EventHandler
+    public void onPreTransaction(PreTransactionEvent event) {
+        if (event.isCancelled() || event.getTransactionType() != BUY || !(event.getOwnerInventory() instanceof AdminInventory)) {
+            return;
+        }
+
+        Player client = event.getClient();
+
+        if (Permission.has(client, Permission.ADMIN)) {
+            return;
+        }
+
+        if (PriceUtil.getSellPrice(event.getSign().getLine(PRICE_LINE)) != NO_PRICE) {
+            return;
+        }
+
+        for (String group : groupList) {
+            if (Permission.has(client, Permission.DISCOUNT + group)) {
+                event.setPrice(event.getPrice() * (config.getDouble(group) / 100));
+                return;
+            }
+        }
+    }
+}

com/Acrobot/ChestShop/Permission.java

@@ -21,7 +21,9 @@ public enum Permission {
     MOD("ChestShop.mod"),
     OTHER_NAME("ChestShop.name."),
     GROUP("ChestShop.group."),
-    NOFEE("ChestShop.nofee");
+
+    NOFEE("ChestShop.nofee"),
+    DISCOUNT("ChestShop.discount.");
 
     private final String permission;