Record gem and material inputs on alloy scrap

README.md

@@ -59,3 +59,5 @@ runs when a report was generated.
 
 Coverage proves the exercised Java behavior. It does not replace a live Paper
 server integration check with the pinned ItemsAdder/MMOItems/TLibs versions.
+
+Failed alloy forges record consumed ingredient quantities on scrap for Recycler recovery. Older scrap retains only its recorded base; missing catalyst history cannot be recovered.

src/main/java/net/tfminecraft/advancedcrafting/objects/alloys/AlloyForger.java

@@ -96,6 +96,11 @@ public NamableAlloy forge(Player p, int i) {
 			ItemManager itemManager = MMOItems.plugin.getItems();
 			ItemStack template = itemManager.getMMOItem(MMOItems.plugin.getTypes().get(scrapType),scrapId).newBuilder().build();
 			if(station.getBaseItem() != null) ScrapProvenance.applyTo(template, station.getBaseItem().getId());
+			var consumed = new java.util.LinkedHashMap<String, Integer>();
+			for (Ingredient ingredient : station.getIngredients()) {
+				consumed.merge(ingredient.getId(), 1, Integer::sum);
+			}
+			ScrapProvenance.applyInputs(template, consumed);
 			loc.getWorld().dropItem(loc, template);
 			return null;
 		}

src/main/java/net/tfminecraft/advancedcrafting/objects/data/ScrapProvenance.java

@@ -1,12 +1,17 @@
 package net.tfminecraft.advancedcrafting.objects.data;
 
 import java.util.Locale;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.bukkit.NamespacedKey;
 
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.persistence.PersistentDataType;
 
 import net.tfminecraft.advancedcrafting.utils.PDCKeys;
+import net.tfminecraft.advancedcrafting.AdvancedCrafting;
 
 /**
  * Records which base ingredient a failed alloy forge consumed, so scrap can be recycled into it.
@@ -34,4 +39,34 @@ public static String readBaseId(ItemStack item) {
 		}
 		return item.getItemMeta().getPersistentDataContainer().get(PDCKeys.scrapBase(), PersistentDataType.STRING);
 	}
+
+	/** Records consumed ingredient quantities per scrap, independently of the legacy base tag. */
+	public static void applyInputs(ItemStack item, Map<String, Integer> amounts) {
+		ItemMeta meta = item.getItemMeta();
+		var container = meta.getPersistentDataContainer();
+		var inputs = container.getAdapterContext().newPersistentDataContainer();
+		amounts.forEach((id, amount) -> inputs.set(
+				new NamespacedKey(AdvancedCrafting.plugin, id.toLowerCase(Locale.ROOT)),
+				PersistentDataType.INTEGER, amount));
+		container.set(PDCKeys.scrapInputs(), PersistentDataType.TAG_CONTAINER, inputs);
+		item.setItemMeta(meta);
+	}
+
+	/** Legacy scrap contains only a base tag; its catalysts cannot be reconstructed. */
+	public static Map<String, Integer> readInputs(ItemStack item) {
+		if (item == null || !item.hasItemMeta()) return Map.of();
+		var inputs = item.getItemMeta().getPersistentDataContainer().get(
+				PDCKeys.scrapInputs(), PersistentDataType.TAG_CONTAINER);
+		if (inputs == null) {
+			String base = readBaseId(item);
+			return base == null || base.isBlank() ? Map.of() : Map.of(base, 1);
+		}
+		Map<String, Integer> amounts = new LinkedHashMap<>();
+		for (var key : inputs.getKeys()) {
+			if (!inputs.has(key, PersistentDataType.INTEGER)) continue;
+			int amount = inputs.get(key, PersistentDataType.INTEGER);
+			if (amount > 0) amounts.put(key.getKey(), amount);
+		}
+		return amounts;
+	}
 }

src/main/java/net/tfminecraft/advancedcrafting/utils/PDCKeys.java

@@ -28,6 +28,10 @@ public static NamespacedKey scrapBase() {
 		return new NamespacedKey(AdvancedCrafting.plugin, "ac_scrap_base");
 	}
 
+	public static NamespacedKey scrapInputs() {
+		return new NamespacedKey(AdvancedCrafting.plugin, "ac_scrap_inputs");
+	}
+
 	public static NamespacedKey ingredientId() {
 		return new NamespacedKey(AdvancedCrafting.plugin, "ac_ingredient_id");
 	}

src/test/java/net/tfminecraft/advancedcrafting/ForgerCoverageTest.java

@@ -78,6 +78,8 @@ void forgeReturnsScrapKnownAlloysNewDiscoveriesAndRecoversStaleIndexes() throws
     try (var dbs = mockConstruction(AlloyDatabase.class)) {
       assertNull(forger(station, 0).forge(p));
       verify(dbs.constructed().getFirst()).saveRecipe(station, "scrap");
+      var dropped = loc.getWorld().getEntitiesByClass(org.bukkit.entity.Item.class).iterator().next().getItemStack();
+      assertEquals(Map.of("iron", 1, "copper", 1), ScrapProvenance.readInputs(dropped));
     }
     try (var dbs =
         mockConstruction(

src/test/java/net/tfminecraft/advancedcrafting/ScrapInputsTest.java

@@ -0,0 +1,41 @@
+package net.tfminecraft.advancedcrafting;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.Map;
+import net.tfminecraft.advancedcrafting.objects.data.ScrapProvenance;
+import net.tfminecraft.advancedcrafting.utils.PDCKeys;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.persistence.PersistentDataType;
+import org.junit.jupiter.api.Test;
+
+class ScrapInputsTest extends CoverageSupport {
+  @Test
+  void inputsRoundTripQuantitiesAndLegacyScrapReturnsOnlyItsBase() {
+    var scrap = new ItemStack(Material.IRON_NUGGET);
+    assertTrue(ScrapProvenance.readInputs(null).isEmpty());
+    assertTrue(ScrapProvenance.readInputs(org.mockito.Mockito.mock(ItemStack.class)).isEmpty());
+    assertTrue(ScrapProvenance.readInputs(scrap).isEmpty());
+    scrap.setItemMeta(scrap.getItemMeta());
+    var meta = scrap.getItemMeta();
+    meta.setDisplayName("Scrap");
+    scrap.setItemMeta(meta);
+    assertTrue(ScrapProvenance.readInputs(scrap).isEmpty());
+    ScrapProvenance.applyTo(scrap, "IRON");
+    assertEquals(Map.of("iron", 1), ScrapProvenance.readInputs(scrap));
+    ScrapProvenance.applyInputs(scrap, Map.of("IRON", 2, "ruby", 3, "zero", 0));
+    assertEquals(Map.of("iron", 2, "ruby", 3), ScrapProvenance.readInputs(scrap));
+    meta = scrap.getItemMeta();
+    var inputs = meta.getPersistentDataContainer().get(PDCKeys.scrapInputs(), PersistentDataType.TAG_CONTAINER);
+    inputs.set(new NamespacedKey(plugin, "bad"), PersistentDataType.STRING, "bad");
+    meta.getPersistentDataContainer().set(PDCKeys.scrapInputs(), PersistentDataType.TAG_CONTAINER, inputs);
+    scrap.setItemMeta(meta);
+    assertEquals(Map.of("iron", 2, "ruby", 3), ScrapProvenance.readInputs(scrap));
+    meta = scrap.getItemMeta();
+    meta.getPersistentDataContainer().remove(PDCKeys.scrapInputs());
+    meta.getPersistentDataContainer().set(PDCKeys.scrapBase(), PersistentDataType.STRING, " ");
+    scrap.setItemMeta(meta);
+    assertTrue(ScrapProvenance.readInputs(scrap).isEmpty());
+  }
+}