Implement gamble shops

src/main/java/com/alttd/playershops/conversation/ConversationManager.java

@@ -71,7 +71,7 @@ public class ConversationManager implements ConversationAbandonedListener {
     private class ChangeTypePrompt extends FixedSetPrompt {
 
         public ChangeTypePrompt() {
-            super("buy", "sell", "none");
+            super("buy", "sell", "none", "gamble");
         }
 
         public @NotNull Component getPromptMessage(ConversationContext context) {

src/main/java/com/alttd/playershops/shop/PlayerShop.java

@@ -17,42 +17,30 @@ import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.scheduler.BukkitRunnable;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.UUID;
+import java.util.*;
 
+@Getter
 public class PlayerShop {
 
-    @Getter
     private UUID shopID;
-    @Getter @Setter // TODO a way to check if the player changed name and update if needed
+    @Setter // TODO a way to check if the player changed name and update if needed
     private String ownerName;
-    @Getter
     private UUID ownerUUID;
-    @Getter
     private ShopType type = ShopType.NONE;
-    @Getter
     private final Location signLocation;
-    @Getter
     private final Location shopLocation;
-    @Getter
     private String server;
-    @Getter
     private double price;
-    @Getter
     private int amount;
-    @Getter
     private double balance;
-    @Getter
     private ItemStack itemStack;
-    @Getter @Setter
+    @Setter
     private long lastTransaction;
-    @Getter @Setter
+    @Setter
     private boolean notifiedOwner = false;
-    @Getter @Setter
+    @Setter
     private boolean dirty;
-    @Getter
-    private List<ShopTransaction> transactions = new ArrayList<>();
+    private final List<ShopTransaction> transactions = new ArrayList<>();
 
     public PlayerShop(Location shopLocation, Location signLocation, Player player) {
         this(shopLocation, signLocation, player.getUniqueId(), player.getName());
@@ -101,8 +89,7 @@ public class PlayerShop {
                 return (int) (balance / getPrice());
             }
             case GAMBLE -> {
-                Logger.warn("Tried to call getRemainingStock on unimplemented GAMBLE type");
-                return 0; //not implemented since gamble shops don't exist yet
+                return getInventory().getContents().length;
             }
             default -> {
                 return 0;
@@ -231,7 +218,7 @@ public class PlayerShop {
         return switch (getType()) {
             case SELL -> executeSellTransaction(orders, player);
             case BUY -> executeBuyTransaction(orders, player);
-            case GAMBLE -> executeGambleTransaction(orders, player);
+            case GAMBLE -> executeGambleTransaction(player);
             default -> TransactionError.NONE; // This should not happen
         };
     }
@@ -318,7 +305,44 @@ public class PlayerShop {
         return TransactionError.NONE;
     }
 
-    private TransactionError executeGambleTransaction(int orders, Player player) {
+    private TransactionError executeGambleTransaction(Player player) {
+        ItemStack itemStack = getRandomItem();
+        if (itemStack == null)
+            return null;
+
+        itemStack = itemStack.clone();
+        double price = getPrice();
+
+        int shopItems = InventoryUtils.countItems(getInventory(), itemStack);
+        if (shopItems < itemStack.getAmount())
+            return TransactionError.INSUFFICIENT_FUNDS_SHOP;
+
+        boolean hasFunds = EconomyUtils.hasSufficientFunds(player, price);
+        if (!hasFunds)
+            return TransactionError.INSUFFICIENT_FUNDS_PLAYER;
+
+        boolean hasRoom = EconomyUtils.canAcceptFunds(this, price);
+        if (!hasRoom)
+            return TransactionError.INVENTORY_FULL_SHOP;
+
+        boolean playerHasRoom = InventoryUtils.hasRoom(player.getInventory(), itemStack);
+        if (!playerHasRoom)
+            return TransactionError.INVENTORY_FULL_PLAYER;
+
+        PlayerExchangeShopEvent playerExchangeShopEvent = new PlayerExchangeShopEvent(player, this);
+        if (Util.callCancellableEvent(playerExchangeShopEvent)) {
+            return TransactionError.CANCELLED;
+        }
+
+        if (!addBalance(price))
+            return TransactionError.CANCELLED;
+
+        InventoryUtils.removeItem(getInventory(), itemStack);
+        EconomyUtils.removeFunds(player, price);
+        InventoryUtils.addItem(player.getInventory(), itemStack);
+        player.updateInventory();
+
+        addTransaction(new ShopTransaction(ShopAction.GAMBLE, player.getName(), 1, price));
         return TransactionError.NONE;
     }
 
@@ -388,6 +412,26 @@ public class PlayerShop {
         transactions.add(transaction);
     }
 
+    private ItemStack getRandomItem() {
+        if (!isInitialized())
+            return null;
+        if (this.getInventory().isEmpty())
+            return null;
+        ArrayList<ItemStack> contents = new ArrayList<>();
+        for (ItemStack it : this.getInventory().getContents()) {
+            if (it != null) {
+                contents.add(it);
+            }
+
+        }
+        if (contents.isEmpty())
+            return null;
+        Collections.shuffle(contents);
+
+        int index = new Random().nextInt(contents.size());
+        return contents.get(index);
+    }
+
     @Override
     public String toString() {
         return "Shop: " + this.getShopID()

src/main/java/com/alttd/playershops/shop/ShopAction.java

@@ -3,6 +3,7 @@ package com.alttd.playershops.shop;
 public enum ShopAction {
     BUY,
     SELL,
+    GAMBLE,
     CREATE,
     CANCELLED;
 }