handle edge case

player drops new item from a looted chest onto ground, add origin to it

src/main/java/lol/hyper/toolstats/ToolStats.java

@@ -73,6 +73,7 @@ public final class ToolStats extends JavaPlugin {
     public ProjectileShoot projectileShoot;
     public ToolStatsKeys toolStatsKeys;
     public InventoryClose inventoryClose;
+    public PlayerDrop playerDrop;
 
     @Override
     public void onEnable() {
@@ -126,6 +127,7 @@ public final class ToolStats extends JavaPlugin {
         blockDispenseEvent = new BlockDispenseEvent(this);
         projectileShoot = new ProjectileShoot(this);
         inventoryClose = new InventoryClose(this);
+        playerDrop = new PlayerDrop(this);
 
         Bukkit.getServer().getPluginManager().registerEvents(blockBreak, this);
         Bukkit.getServer().getPluginManager().registerEvents(chunkPopulate, this);
@@ -148,6 +150,7 @@ public final class ToolStats extends JavaPlugin {
         Bukkit.getServer().getPluginManager().registerEvents(blockDispenseEvent, this);
         Bukkit.getServer().getPluginManager().registerEvents(projectileShoot, this);
         Bukkit.getServer().getPluginManager().registerEvents(inventoryClose, this);
+        Bukkit.getServer().getPluginManager().registerEvents(playerDrop, this);
 
         this.getCommand("toolstats").setExecutor(commandToolStats);
 

src/main/java/lol/hyper/toolstats/events/PlayerDrop.java

@@ -0,0 +1,65 @@
+/*
+ * This file is part of ToolStats.
+ *
+ * ToolStats is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ToolStats is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ToolStats.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package lol.hyper.toolstats.events;
+
+import lol.hyper.toolstats.ToolStats;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+
+public class PlayerDrop implements Listener {
+
+    private final ToolStats toolStats;
+
+    public PlayerDrop(ToolStats toolStats) {
+        this.toolStats = toolStats;
+    }
+
+    @EventHandler
+    public void onDrop(PlayerDropItemEvent event) {
+        Player player = event.getPlayer();
+        if (!toolStats.configTools.checkWorld(player.getWorld().getName())) {
+            return;
+        }
+
+        if (toolStats.generateLoot.generatedInventory.isEmpty()) {
+            return;
+        }
+
+        player.getScheduler().runDelayed(toolStats, scheduledTask -> {
+            Inventory opened = player.getOpenInventory().getTopInventory();
+            if (toolStats.generateLoot.generatedInventory.containsKey(opened)) {
+                Item droppedItemEntity = event.getItemDrop();
+                ItemStack droppedItem = droppedItemEntity.getItemStack();
+
+                if (!toolStats.itemChecker.isValidItem(droppedItem.getType())) {
+                    return;
+                }
+
+                ItemStack newItem = toolStats.inventoryClose.addLootedOrigin(droppedItem, player);
+                if (newItem != null) {
+                    droppedItemEntity.setItemStack(newItem);
+                }
+            }
+        }, null, 1);
+    }
+}