Inital commit

src/main/java/pl/pabilo8/immersiveintelligence/ImmersiveIntelligence.java

@@ -19,6 +19,7 @@
 import pl.pabilo8.immersiveintelligence.common.compat.IICompatModule;
 import pl.pabilo8.immersiveintelligence.common.event.IEOverrideEventHandler;
 import pl.pabilo8.immersiveintelligence.common.event.LightEngineerEventHandler;
+import pl.pabilo8.immersiveintelligence.common.util.IEVillagerHandlerCustom;
 import pl.pabilo8.immersiveintelligence.common.util.IISkinHandler;
 import pl.pabilo8.immersiveintelligence.common.util.Reflector;
 
@@ -63,6 +64,8 @@ public void init(FMLInitializationEvent event)
 		proxy.init();
 
 		IISounds.init();
+
+		IEVillagerHandlerCustom.initIEVillagerTrades();
 	}
 
 	@EventHandler

src/main/java/pl/pabilo8/immersiveintelligence/common/util/IEVillagerHandlerCustom.java

@@ -0,0 +1,96 @@
+package pl.pabilo8.immersiveintelligence.common.util;
+
+import blusunrize.immersiveengineering.common.util.IEVillagerHandler;
+import net.minecraft.entity.IMerchant;
+import net.minecraft.entity.passive.EntityVillager;
+import net.minecraft.init.Items;
+import net.minecraft.item.ItemStack;
+import net.minecraft.village.MerchantRecipe;
+import net.minecraft.village.MerchantRecipeList;
+import net.minecraftforge.fml.common.registry.VillagerRegistry;
+import net.minecraftforge.oredict.OreDictionary;
+
+import java.util.Random;
+
+import java.lang.reflect.Field;
+import java.util.List;
+
+public class IEVillagerHandlerCustom extends IEVillagerHandler {
+
+	// Initialize trades with instance method
+	public static void initIEVillagerTrades() {
+		// Call parent initialization method if needed
+		IEVillagerHandler.initIEVillagerTrades();
+
+		// Retrieve the profession and add career if it doesn't already exist
+		VillagerRegistry.VillagerProfession engineerProfession = IEVillagerHandler.PROF_ENGINEER;
+		if (engineerProfession != null) {
+			boolean careerExists = false;
+
+			try {
+				// Access private "careers" field using reflection
+				Field careersField = VillagerRegistry.VillagerProfession.class.getDeclaredField("careers");
+				careersField.setAccessible(true);
+				List<VillagerRegistry.VillagerCareer> careers = (List<VillagerRegistry.VillagerCareer>) careersField.get(engineerProfession);
+
+				// Check if the "gunsmith" career already exists
+				for (VillagerRegistry.VillagerCareer career : careers) {
+					if ("immersiveengineering.gunsmith".equals(career.getName())) {
+						careerExists = true;
+						break;
+					}
+				}
+
+				// Add career if it doesn't exist
+				if (!careerExists) {
+					VillagerRegistry.VillagerCareer careerGunsmith = new VillagerRegistry.VillagerCareer(engineerProfession, "immersiveengineering.gunsmith");
+
+					// Add a custom trade for iron barrel replacement
+					careerGunsmith.addTrade(1, new EntityVillager.ITradeList[]{
+							new ReplaceSteelBarrelWithIron()
+					});
+				}
+			} catch (NoSuchFieldException | IllegalAccessException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	// Custom trade class for replacing steel barrel with iron barrel
+	private static class ReplaceSteelBarrelWithIron implements EntityVillager.ITradeList
+	{
+		@Override
+		public void addMerchantRecipe(IMerchant merchant, MerchantRecipeList recipeList, Random random)
+		{
+			// Retrieve OreDict items
+			ItemStack steelBarrelStack = getOreDictStack("gunbarrelSteel");
+			ItemStack ironBarrelStack = getOreDictStack("gunbarrelIron");
+
+			// Check that both items exist before adding the trade
+			if(!steelBarrelStack.isEmpty()&&!ironBarrelStack.isEmpty())
+			{
+				// Remove existing trade if it matches the trade you want to replace
+				recipeList.removeIf(recipe ->
+						recipe.getItemToBuy().isItemEqual(new ItemStack(Items.EMERALD, 4))&&
+								recipe.getSecondItemToBuy().isItemEqual(ironBarrelStack)
+				);
+
+				// Add the new trade with iron barrel and set the price
+				recipeList.add(new MerchantRecipe(
+						new ItemStack(Items.EMERALD, 4), // 4 emeralds price
+						ironBarrelStack
+				));
+			}
+		}
+
+		// Retrieve an item from the Ore Dictionary
+		private ItemStack getOreDictStack(String oreDictName)
+		{
+			if(OreDictionary.doesOreNameExist(oreDictName)&&!OreDictionary.getOres(oreDictName).isEmpty())
+			{
+				return OreDictionary.getOres(oreDictName).get(0).copy();
+			}
+			return ItemStack.EMPTY;
+		}
+	}
+}