Added "Allow Normal Furnaces" option.

src/main/java/com/songoda/epicfurnaces/EpicFurnaces.java

@@ -391,6 +391,13 @@ public class  EpicFurnaces extends SongodaPlugin {
         }
     }
 
+    public boolean isLeveledFurnace(ItemStack itemStack) {
+        NBTCore nbt = NmsManager.getNbt();
+        NBTItem nbtItem = nbt.of(itemStack);
+
+        return nbtItem.has("level") && nbtItem.has("uses");
+    }
+
     public ItemStack createLeveledFurnace(Material material, int level, int uses) {
         ItemStack item = new ItemStack(material, 1);
 

src/main/java/com/songoda/epicfurnaces/furnace/FurnaceManager.java

@@ -2,6 +2,7 @@ package com.songoda.epicfurnaces.furnace;
 
 import com.google.common.collect.Multimap;
 import com.google.common.collect.MultimapBuilder;
+import com.songoda.epicfurnaces.settings.Settings;
 import com.songoda.epicfurnaces.utils.GameArea;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
@@ -36,7 +37,7 @@ public class FurnaceManager {
     }
 
     public Furnace getFurnace(Location location) {
-        if (!registeredFurnaces.containsKey(location)) {
+        if (!Settings.ALLOW_NORMAL_FURNACES.getBoolean() && !registeredFurnaces.containsKey(location)) {
             addFurnace(new FurnaceBuilder(location).build());
         }
         return registeredFurnaces.get(location);

src/main/java/com/songoda/epicfurnaces/listeners/BlockListeners.java

@@ -3,6 +3,7 @@ package com.songoda.epicfurnaces.listeners;
 import com.songoda.epicfurnaces.EpicFurnaces;
 import com.songoda.epicfurnaces.furnace.Furnace;
 import com.songoda.epicfurnaces.furnace.FurnaceBuilder;
+import com.songoda.epicfurnaces.settings.Settings;
 import com.songoda.epicfurnaces.utils.GameArea;
 import org.bukkit.Location;
 import org.bukkit.Material;
@@ -57,6 +58,10 @@ public class BlockListeners implements Listener {
 
         ItemStack item = event.getItemInHand();
 
+        if (!plugin.isLeveledFurnace(item) && Settings.ALLOW_NORMAL_FURNACES.getBoolean()) {
+            return;
+        }
+
         Location location = event.getBlock().getLocation();
 
         Furnace furnace = event.getItemInHand().getItemMeta().hasDisplayName() && plugin.getFurnaceLevel(item) != 1
@@ -83,6 +88,11 @@ public class BlockListeners implements Listener {
             return;
 
         Furnace furnace = plugin.getFurnaceManager().getFurnace(block);
+
+        if (furnace == null) {
+            return;
+        }
+
         int level = plugin.getFurnaceManager().getFurnace(block).getLevel().getLevel();
 
         plugin.clearHologram(furnace);

src/main/java/com/songoda/epicfurnaces/listeners/FurnaceListeners.java

@@ -36,8 +36,11 @@ public class FurnaceListeners implements Listener {
     @EventHandler
     public void onFuel(FurnaceBurnEvent event) {
         Furnace furnace = plugin.getFurnaceManager().getFurnace(event.getBlock().getLocation());
+        if (furnace == null) {
+            return;
+        }
 
-        Level level = furnace != null ? furnace.getLevel() : plugin.getLevelManager().getLowestLevel();
+        Level level = furnace.getLevel();
 
         if (level.getFuelDuration() != 0) return;
 

src/main/java/com/songoda/epicfurnaces/listeners/InteractListeners.java

@@ -2,6 +2,7 @@ package com.songoda.epicfurnaces.listeners;
 
 import com.songoda.core.gui.GuiManager;
 import com.songoda.epicfurnaces.EpicFurnaces;
+import com.songoda.epicfurnaces.furnace.Furnace;
 import com.songoda.skyblock.SkyBlock;
 import org.bukkit.Bukkit;
 import org.bukkit.block.Block;
@@ -52,9 +53,14 @@ public class InteractListeners implements Listener {
                     return;
         }
     
-    
+
+        Furnace furnace = plugin.getFurnaceManager().getFurnace(block.getLocation());
+        if (furnace == null) {
+            return;
+        }
+
         event.setCancelled(true);
 
-        plugin.getFurnaceManager().getFurnace(block.getLocation()).overview(guiManager, player);
+        furnace.overview(guiManager, player);
     }
 }

src/main/java/com/songoda/epicfurnaces/listeners/InventoryListeners.java

@@ -1,6 +1,7 @@
 package com.songoda.epicfurnaces.listeners;
 
 import com.songoda.epicfurnaces.EpicFurnaces;
+import com.songoda.epicfurnaces.furnace.Furnace;
 import org.bukkit.Material;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
@@ -29,8 +30,10 @@ public class InventoryListeners implements Listener {
                 || event.getDestination().getItem(0).getAmount() != 1) {
             return;
         }
-        plugin.getFurnaceManager().getFurnace(((org.bukkit.block.Furnace)
+        Furnace furnace = plugin.getFurnaceManager().getFurnace(((org.bukkit.block.Furnace)
-                event.getDestination().getHolder()).getLocation()).updateCook();
+                event.getDestination().getHolder()).getLocation());
+        if (furnace != null)
+            furnace.updateCook();
     }
 
     @SuppressWarnings("unchecked")

src/main/java/com/songoda/epicfurnaces/settings/Settings.java

@@ -54,6 +54,10 @@ public class Settings {
     public static final ConfigSetting CUSTOM_RECIPES = new ConfigSetting(config, "Main.Use Custom Recipes", true);
     public static final ConfigSetting NO_REWARDS_FROM_RECIPES = new ConfigSetting(config, "Main.No Rewards From Custom Recipes", true);
 
+    public static final ConfigSetting ALLOW_NORMAL_FURNACES = new ConfigSetting(config, "Main.Allow Normal Furnaces", false,
+            "Should normal furnaces not be converted into",
+            "Epic Furnaces?");
+
     public static final ConfigSetting PARTICLE_TYPE = new ConfigSetting(config, "Main.Upgrade Particle Type", "SPELL_WITCH",
             "The type of particle shown when a furnace is upgraded.");