Initial setup

src/main/java/mod/treestar/shopmod/SilverShop.java

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+package mod.treestar.shopmod;
+
+import mod.treestar.shopmod.itemprovider.SilverShopItemProvider;
+import org.gotti.wurmunlimited.modloader.interfaces.WurmServerMod;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SilverShop implements WurmServerMod {
+
+    @Override
+    public void init() {
+
+    }
+}

src/main/java/mod/treestar/shopmod/SilverShopService.java

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+package mod.treestar.shopmod;
+
+import com.wurmonline.server.players.Player;
+import mod.treestar.shopmod.categoryprovider.SilverShopCategoryProvider;
+import mod.treestar.shopmod.datamodels.SilverShopCategory;
+import mod.treestar.shopmod.datamodels.SilverShopItem;
+import mod.treestar.shopmod.datamodels.SilverShopPurchaseOrder;
+import mod.treestar.shopmod.itemprovider.SilverShopItemProvider;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+
+public class SilverShopService {
+    private HashMap<Integer, SilverShopCategory> categories;
+    private HashMap<Integer, SilverShopItem> items;
+    private List<SilverShopCategoryProvider> categoryProviders;
+    private List<SilverShopItemProvider> itemProviders;
+
+    private static SilverShopService instance;
+
+    public void init() {
+        for (SilverShopCategoryProvider categoryProvider : categoryProviders) {
+
+            List<SilverShopCategory> providerCategories = categoryProvider.getCategories();
+            for (SilverShopCategory category : providerCategories) {
+                if (categories.containsKey(category.getId())) {
+                    // Ignore it. The newer category simply won't update any details.
+                    continue;
+                }
+
+                categories.put(category.getId(), category);
+            }
+        }
+        for (SilverShopItemProvider itemProvider : itemProviders) {
+            List<SilverShopItem> providerItems = itemProvider.getItems();
+
+        }
+    }
+
+    public boolean canPurchase(SilverShopPurchaseOrder purchaseOrder, Player shopper) {
+        long totalCost = purchaseOrder.getTotalCost();
+
+        if(shopper.getMoney() < totalCost) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public boolean attemptPurchase(SilverShopPurchaseOrder purchaseOrder, Player shopper) {
+        if(!canPurchase(purchaseOrder, shopper)) {
+            return false;
+        }
+
+        long totalCost = purchaseOrder.getTotalCost();
+        try {
+            if (shopper.chargeMoney(totalCost)) {
+                return true;
+            }
+        } catch (IOException e) {
+            return false;
+        }
+
+        return false;
+    }
+
+    public static SilverShopService getInstance() {
+        if(instance == null) {
+            instance = new SilverShopService();
+        }
+        return instance;
+    }
+}

src/main/java/mod/treestar/shopmod/categoryprovider/SilverShopCategoryProvider.java

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+package mod.treestar.shopmod.categoryprovider;
+
+import mod.treestar.shopmod.datamodels.SilverShopCategory;
+
+import java.util.List;
+
+public interface SilverShopCategoryProvider {
+    void init();
+    List<SilverShopCategory> getCategories();
+}

src/main/java/mod/treestar/shopmod/datamodels/SilverShopCategory.java

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+package mod.treestar.shopmod.datamodels;
+
+import java.util.List;
+
+/**
+ * A category containing some number of items for the silver shop.
+ */
+public class SilverShopCategory {
+    private int id;
+    private String name;
+    private String description;
+
+    private List<SilverShopItem> items;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public List<SilverShopItem> getItems() {
+        return items;
+    }
+
+    public void setItems(List<SilverShopItem> items) {
+        this.items = items;
+    }
+}

src/main/java/mod/treestar/shopmod/datamodels/SilverShopItem.java

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+package mod.treestar.shopmod.datamodels;
+
+import mod.treestar.shopmod.purchasehandlers.SilverShopItemPurchaseEffect;
+
+/**
+ * Represents a single item for purchase in the silver shop. This may be an in-game item, service, etc.
+ */
+public class SilverShopItem {
+    private int id;
+    private String name;
+    private String description;
+    private String image;
+    private long ironPrice;
+    private int categoryId;
+
+    private SilverShopItemPurchaseEffect purchaseHandler;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public String getImage() {
+        return image;
+    }
+
+    public void setImage(String image) {
+        this.image = image;
+    }
+
+    public long getIronPrice() {
+        return ironPrice;
+    }
+
+    public void setIronPrice(long ironPrice) {
+        this.ironPrice = ironPrice;
+    }
+
+    public SilverShopItemPurchaseEffect getPurchaseHandler() {
+        return purchaseHandler;
+    }
+
+    public void setPurchaseHandler(SilverShopItemPurchaseEffect purchaseHandler) {
+        this.purchaseHandler = purchaseHandler;
+    }
+
+    public int getCategoryId() {
+        return categoryId;
+    }
+
+    public void setCategoryId(int categoryId) {
+        this.categoryId = categoryId;
+    }
+}

src/main/java/mod/treestar/shopmod/datamodels/SilverShopPurchaseOrder.java

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+package mod.treestar.shopmod.datamodels;
+
+import java.util.List;
+
+/**
+ * A single purchase in the shop.
+ */
+public class SilverShopPurchaseOrder {
+    private List<SilverShopItem> shoppingCart;
+
+    public List<SilverShopItem> getShoppingCart() {
+        return shoppingCart;
+    }
+
+    public void setShoppingCart(List<SilverShopItem> shoppingCart) {
+        this.shoppingCart = shoppingCart;
+    }
+
+    public long getTotalCost() {
+        return getShoppingCart().stream().mapToLong(SilverShopItem::getIronPrice).sum();
+    }
+}

src/main/java/mod/treestar/shopmod/itemprovider/SilverShopItemProvider.java

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+package mod.treestar.shopmod.itemprovider;
+
+import mod.treestar.shopmod.datamodels.SilverShopCategory;
+import mod.treestar.shopmod.datamodels.SilverShopItem;
+
+import java.util.List;
+
+/**
+ * An interface representing a provider of silver shop items.
+ */
+public interface SilverShopItemProvider {
+    void init();
+    List<SilverShopItem> getItems();
+}

src/main/java/mod/treestar/shopmod/purchasehandlers/SilverShopItemPurchaseEffect.java

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+package mod.treestar.shopmod.purchasehandlers;
+
+import com.wurmonline.server.players.Player;
+
+public interface SilverShopItemPurchaseEffect {
+    /**
+     * What happens after a player successfully purchases the item. This assumes the transaction was completed successfully.
+     * @param player the player that performed the purchase
+     */
+    void onPurchase(Player player);
+}

src/main/java/mod/treestar/shopmod/purchasehandlers/SilverShopWurmItemPurchaseEffect.java

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+package mod.treestar.shopmod.purchasehandlers;
+
+import com.wurmonline.server.FailedException;
+import com.wurmonline.server.items.*;
+import com.wurmonline.server.players.Player;
+
+/**
+ * Simple item purchase effect that gives a player a specific item on a successful purchase.
+ * @see SilverShopItemPurchaseEffect
+ */
+public class SilverShopWurmItemPurchaseEffect implements SilverShopItemPurchaseEffect {
+    private int itemTemplateId;
+    private float ql;
+    private boolean randomQl;
+    private byte rarity;
+
+    @Override
+    public void onPurchase(Player player) {
+        try {
+            Item item = ItemFactory.createItem(itemTemplateId, ql, (byte) 0, (byte) 0, null);
+            player.getInventory().insertItem(item);
+            ItemTemplate template = ItemTemplateFactory.getInstance().getTemplate(itemTemplateId);
+            player.sendSystemMessage(String.format("You receive a %s.", template.getName()));
+        } catch (NoSuchTemplateException e) {
+            throw new RuntimeException(e);
+        } catch (FailedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}