Fix replacing items in NBT data:

It is not enough to change the material and quantity, apparently there are preset NBT data;

src/com/pretzel/dev/villagertradelimiter/listeners/PlayerListener.java

@@ -5,7 +5,13 @@ import com.pretzel.dev.villagertradelimiter.data.Cooldown;
 import com.pretzel.dev.villagertradelimiter.data.PlayerData;
 import com.pretzel.dev.villagertradelimiter.lib.Util;
 import com.pretzel.dev.villagertradelimiter.settings.Settings;
-import com.pretzel.dev.villagertradelimiter.wrappers.*;
+import com.pretzel.dev.villagertradelimiter.wrappers.IngredientWrapper;
+import com.pretzel.dev.villagertradelimiter.wrappers.PlayerWrapper;
+import com.pretzel.dev.villagertradelimiter.wrappers.RecipeWrapper;
+import com.pretzel.dev.villagertradelimiter.wrappers.VillagerWrapper;
+import java.time.Instant;
+import java.util.Date;
+import java.util.List;
 import org.bukkit.Material;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.configuration.ConfigurationSection;
@@ -18,10 +24,6 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
 
-import java.time.Instant;
-import java.util.Date;
-import java.util.List;
-
 public class PlayerListener implements Listener {
     private final VillagerTradeLimiter instance;
     private final Settings settings;
@@ -146,7 +148,7 @@ public class PlayerListener implements Listener {
      * @return The initial price of a recipe/trade, before any discounts are applied
      */
     private int getBasePrice(final RecipeWrapper recipe) {
-        int basePrice = recipe.getIngredient1().getAmount();
+        int basePrice = recipe.getIngredient1().getItemStack().getAmount();
         basePrice = settings.fetchInt(recipe, "Item1.Amount", basePrice);
         return Math.min(Math.max(basePrice, 1), 64);
     }
@@ -260,7 +262,13 @@ public class PlayerListener implements Listener {
      */
     private void setIngredient(final ConfigurationSection item, final IngredientWrapper ingredient) {
         if(item == null) return;
-        ingredient.setMaterialId("minecraft:"+item.getString("Material", ingredient.getMaterialId()).toLowerCase().replace("minecraft:",""));
+        ItemStack previous = ingredient.getItemStack();
-        ingredient.setAmount(item.getInt("Amount", ingredient.getAmount()));
+        Material material = Material.matchMaterial(item.getString("Material", previous.getType().getKey().getKey()));
+        if (material != null) {
+            ingredient.setItemStack(new ItemStack(
+                material,
+                item.getInt("Amount", previous.getAmount())
+            ));
+        }
     }
 }

src/com/pretzel/dev/villagertradelimiter/wrappers/IngredientWrapper.java

@@ -1,35 +1,35 @@
 package com.pretzel.dev.villagertradelimiter.wrappers;
 
 import de.tr7zw.changeme.nbtapi.NBTCompound;
+import org.bukkit.inventory.ItemStack;
 
 public class IngredientWrapper {
-    private final NBTCompound ingredient;
+    private final NBTCompound recipe;
-    private final String materialId;
+    private final String key;
-    private final int amount;
+    private final ItemStack itemStack;
 
-    /** @param ingredient The NBTCompound that contains the recipe's NBT data of the ingredient */
+    /**
-    public IngredientWrapper(final NBTCompound ingredient) {
+     * @param recipe The NBTCompound that contains the recipe's NBT data of the ingredient
-        this.ingredient = ingredient;
+     * @param key The key under which the recipe is located
-        this.materialId = getMaterialId();
+     */
-        this.amount = getAmount();
+    public IngredientWrapper(final NBTCompound recipe, final String key) {
+        this.recipe = recipe;
+        this.key = key;
+        this.itemStack = getItemStack();
     }
 
-    /** @return The ingredient's material id (e.g, minecraft:enchanted_book) */
+    /** @return The {@link ItemStack} representing the data in the recipe */
-    public String getMaterialId() { return ingredient.getString("id"); }
+    public ItemStack getItemStack() {
+        return recipe.getItemStack(key);
+    }
 
-    /** @return The number of items in the ingredient stack, between 1 and 64 */
+    /** @param itemStack The {@link ItemStack} which will replace the item in the recipe */
-    public int getAmount() { return ingredient.getByte("Count").intValue(); }
+    public void setItemStack(final ItemStack itemStack) {
-
+        recipe.setItemStack(key, itemStack);
-
+    }
-    /** @param id The ingredient's material id (e.g, minecraft:enchanted_book) */
-    public void setMaterialId(final String id) { this.ingredient.setString("id", id); }
-
-    /** @param amount The number of items in the ingredient stack, which is clamped between 1 and 64 by this function */
-    public void setAmount(int amount) { this.ingredient.setByte("Count", (byte)Math.max(Math.min(amount, 64), 1)); }
 
     /** Resets the material ID and the amount of this ingredient to default values */
     public void reset() {
-        setMaterialId(this.materialId);
+        setItemStack(itemStack);
-        setAmount(this.amount);
     }
 }

src/com/pretzel/dev/villagertradelimiter/wrappers/RecipeWrapper.java

@@ -20,9 +20,9 @@ public class RecipeWrapper {
     /** @param recipe The NBTCompound that contains the villager's NBT data of the recipe */
     public RecipeWrapper(final NBTCompound recipe) {
         this.recipe = recipe;
-        this.ingredient1 = new IngredientWrapper(recipe.getCompound("buy"));
+        this.ingredient1 = new IngredientWrapper(recipe, "buy");
-        this.ingredient2 = new IngredientWrapper(recipe.getCompound("buyB"));
+        this.ingredient2 = new IngredientWrapper(recipe, "buyB");
-        this.result = new IngredientWrapper(recipe.getCompound("sell"));
+        this.result = new IngredientWrapper(recipe, "sell");
         this.specialPrice = getSpecialPrice();
     }