Make chestshop buying transactions fail if money deposit on seller's account fails.

Some economy plugins, such as Gringotts, only allow a limited amount of money in an account.
Thus, deposits to an account can fail. Chestshop would ignore the failure, which could cause a seller not
to receive the payment for selling an item.

This commit fixes the problem by canceling a transaction if the seller is not able to receive the money of a sale.

com/Acrobot/ChestShop/Configuration/Messages.java

@@ -17,6 +17,9 @@ public class Messages {
 
     public static String NOT_ENOUGH_MONEY = "You don't have enough money!";
     public static String NOT_ENOUGH_MONEY_SHOP = "Shop owner doesn't have enough money!";
+    
+    public static String DEPOSIT_FAILED = "Money deposit to shop owner failed!";
+    public static String DEPOSIT_FAILED_OWNER = "Money deposit to your account failed, shop transaction aborted!";
 
     public static byte NEWLINE_NOT_ENOUGH_MONEY_SHO; ///////////////////////////////////////////////////
 

com/Acrobot/ChestShop/Economy/Economy.java

@@ -31,7 +31,7 @@ public class Economy {
         return ChestShopSign.isAdminShop(acc);
     }
 
-    public static void add(String name, double amount) {
+    public static boolean add(String name, double amount) {
         if (isServerAccount(name) && !getServerAccountName().isEmpty()) {
             name = getServerAccountName();
         }
@@ -46,19 +46,19 @@ public class Economy {
             amount -= tax;
         }
 
-        manager.add(uName.getName(name), amount);
+        return manager.add(uName.getName(name), amount);
     }
 
     public static double getTax(float tax, double price) {
         return NumberUtil.roundDown((tax / 100F) * price);
     }
 
-    public static void subtract(String name, double amount) {
+    public static boolean subtract(String name, double amount) {
         if (isServerAccount(name) && !getServerAccountName().isEmpty()) {
             name = getServerAccountName();
         }
 
-        manager.subtract(uName.getName(name), roundUp(amount));
+        return manager.subtract(uName.getName(name), roundUp(amount));
     }
 
     public static boolean hasEnough(String name, double amount) {

com/Acrobot/ChestShop/Economy/EconomyManager.java

@@ -11,12 +11,14 @@ public class EconomyManager {
         return false;
     }
 
-    public void add(String player, double amount) {
+    public boolean add(String player, double amount) {
         printError();
+        return false;
     }
 
-    public void subtract(String player, double amount) {
+    public boolean subtract(String player, double amount) {
         printError();
+        return false;
     }
 
     public boolean hasEnough(String player, double amount) {

com/Acrobot/ChestShop/Economy/Register.java

@@ -16,12 +16,12 @@ public class Register extends EconomyManager {
         return method.hasAccount(player);
     }
 
-    public void add(String player, double amount) {
-        method.getAccount(player).add(amount);
+    public boolean add(String player, double amount) {
+        return method.getAccount(player).add(amount);
     }
 
-    public void subtract(String player, double amount) {
-        method.getAccount(player).subtract(amount);
+    public boolean subtract(String player, double amount) {
+        return method.getAccount(player).subtract(amount);
     }
 
     public boolean hasEnough(String player, double amount) {

com/Acrobot/ChestShop/Economy/Vault.java

@@ -13,12 +13,12 @@ public class Vault extends EconomyManager {
         return vaultPlugin.hasAccount(player);
     }
 
-    public void add(String player, double amount) {
-        vaultPlugin.depositPlayer(player, amount);
+    public boolean add(String player, double amount) {
+        return vaultPlugin.depositPlayer(player, amount).transactionSuccess();
     }
 
-    public void subtract(String player, double amount) {
-        vaultPlugin.withdrawPlayer(player, amount);
+    public boolean subtract(String player, double amount) {
+        return vaultPlugin.withdrawPlayer(player, amount).transactionSuccess();
     }
 
     public boolean hasEnough(String player, double amount) {

com/Acrobot/ChestShop/Events/PreTransactionEvent.java

@@ -125,6 +125,8 @@ public class PreTransactionEvent extends Event {
 
         CLIENT_DOES_NOT_HAVE_ENOUGH_MONEY,
         SHOP_DOES_NOT_HAVE_ENOUGH_MONEY,
+        /** not enough space in shop's account for money deposit on sell */
+        SHOP_DEPOSIT_FAILED,
 
         NOT_ENOUGH_SPACE_IN_CHEST,
         NOT_ENOUGH_SPACE_IN_INVENTORY,

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

@@ -14,7 +14,7 @@ import org.bukkit.inventory.ItemStack;
 import java.util.LinkedList;
 import java.util.List;
 
-import static com.Acrobot.ChestShop.Configuration.Messages.NOT_ENOUGH_STOCK_IN_YOUR_SHOP;
+import static com.Acrobot.ChestShop.Configuration.Messages.*;
 
 /**
  * @author Acrobot
@@ -58,12 +58,27 @@ public class ErrorMessageSender implements Listener {
                 sendMessageToOwner(event.getOwner(), messageOutOfStock);
                 message = Messages.NOT_ENOUGH_STOCK;
                 break;
+            case SHOP_DEPOSIT_FAILED:
+            	String messageDepositFailed = Messages.prefix(DEPOSIT_FAILED);
+                sendMessageToOwner(event.getOwner(), messageDepositFailed);
+                message = DEPOSIT_FAILED;
+                break;
             case SHOP_IS_RESTRICTED:
                 message = Messages.ACCESS_DENIED;
                 break;
             case INVALID_SHOP:
                 message = Messages.INVALID_SHOP_DETECTED;
                 break;
+			case CREATIVE_MODE_PROTECTION:
+				break;
+			case OTHER:
+				break;
+			case SPAM_CLICKING_PROTECTION:
+				break;
+			case TRANSACTION_SUCCESFUL:
+				break;
+			default:
+				break;
         }
 
         if (message != null) {

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

@@ -47,6 +47,17 @@ public class PartialTransactionModule implements Listener {
             event.setPrice(amountAffordable * pricePerItem);
             event.setStock(getCountedItemStack(stock, amountAffordable));
         }
+        
+        String seller = event.getOwner().getName();
+        boolean added = Economy.add(seller, price);
+        if (added) {
+        	// added amount successfully, owner has enough space for deposit
+        	// --> undo the add, for some other event to actually do.
+        	Economy.subtract(seller, price);
+        } else {
+        	event.setCancelled(SHOP_DEPOSIT_FAILED);
+        	return;
+        }
 
         stock = event.getStock();