Added Object & Jigsaw Loot Tables

- Added the ability for placed objects and jigsaws to have select loot tables
    - Includes the ability to filter loot tables based on block type/block state
    - Overrides loot tables from the biome/region, but if no loot tables are provided for an object, they will still be used
    - Uses weight based system for determining which table to pick (so it's guaranteed rather than by chance)
- Added WeightedRandom util class
- Fixed loot tables not being random based on the seed
- Fixed jigsaws breaking bedrock
- Fixed enchantments in loot tables not working for enchanted books
- Fixed mobs spawned in Jigsaws not being spawned in the center like they should be

src/main/java/com/volmit/iris/scaffold/engine/Engine.java

@@ -302,6 +302,17 @@ public interface Engine extends DataProvider, Fallible, GeneratorAccess, LootPro
         int rx = b.getX();
         int rz = b.getZ();
         double he = getFramework().getComplex().getHeightStream().get(rx, rz);
+        PlacedObject po = getFramework().getEngine().getObjectPlacement(rx, b.getY(), rz);
+        if (po != null && po.getPlacement() != null) {
+
+            if(B.isStorageChest(b.getBlockData()))
+            {
+                IrisLootTable table = po.getPlacement().getTable(b.getBlockData(), getData());
+                if (table != null) {
+                    return new KList<>(table);
+                }
+            }
+        }
         IrisRegion region = getFramework().getComplex().getRegionStream().get(rx, rz);
         IrisBiome biomeSurface = getFramework().getComplex().getTrueBiomeStream().get(rx, rz);
         IrisBiome biomeUnder = b.getY() < he ? getFramework().getComplex().getCaveBiomeStream().get(rx, rz) : biomeSurface;

src/main/java/com/volmit/iris/scaffold/jigsaw/PlannedPiece.java

@@ -1,17 +1,25 @@
 package com.volmit.iris.scaffold.jigsaw;
 
+import com.volmit.iris.Iris;
+import com.volmit.iris.generator.IrisEngine;
 import com.volmit.iris.manager.IrisDataManager;
 import com.volmit.iris.object.*;
 import com.volmit.iris.object.tile.TileData;
+import com.volmit.iris.scaffold.IrisWorlds;
+import com.volmit.iris.scaffold.engine.Engine;
+import com.volmit.iris.scaffold.engine.IrisAccess;
 import com.volmit.iris.util.AxisAlignedBB;
 import com.volmit.iris.util.IObjectPlacer;
 import com.volmit.iris.util.KList;
 import com.volmit.iris.util.RNG;
 import lombok.Data;
+import org.bukkit.Material;
 import org.bukkit.World;
+import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.block.TileState;
 import org.bukkit.block.data.BlockData;
+import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.util.BlockVector;
 
 @Data
@@ -129,8 +137,17 @@ public class PlannedPiece {
     }
 
     public void place(World world) {
+        IrisAccess a = IrisWorlds.access(world);
+
+        int minY = 0;
+        if (a != null) {
+            minY = a.getCompound().getDefaultEngine().getMinHeight();
+
+            if (!a.getCompound().getRootDimension().isBedrock()) minY--; //If the dimension has no bedrock, allow it to go a block lower
+        }
 
         getPiece().getPlacementOptions().getRotation().setEnabled(false);
+        int finalMinY = minY;
         getObject().place(position.getX()+getObject().getCenter().getBlockX(), position.getY()+getObject().getCenter().getBlockY(), position.getZ()+getObject().getCenter().getBlockZ(), new IObjectPlacer() {
             @Override
             public int getHighest(int x, int z) {
@@ -144,7 +161,22 @@ public class PlannedPiece {
 
             @Override
             public void set(int x, int y, int z, BlockData d) {
-                world.getBlockAt(x,y,z).setBlockData(d);
+                Block block = world.getBlockAt(x, y, z);
+
+                //Prevent blocks being set in or bellow bedrock
+                if (y <= finalMinY || block.getType() == Material.BEDROCK) return;
+
+                block.setBlockData(d);
+
+                if (a != null && getPiece().getPlacementOptions().getLoot().isNotEmpty() &&
+                        block.getState() instanceof InventoryHolder) {
+
+                    IrisLootTable table = getPiece().getPlacementOptions().getTable(block.getBlockData(), getData());
+                    if (table == null) return;
+                    Engine engine = a.getCompound().getEngineForHeight(y);
+                    engine.addItems(false, ((InventoryHolder) block.getState()).getInventory(), getStructure().getRng(),
+                            new KList<>(table), InventorySlotType.STORAGE, x, y, z, 15);
+                }
             }
 
             @Override
@@ -183,6 +215,6 @@ public class PlannedPiece {
                 tile.toBukkitTry(state);
                 state.update();
             }
-        }, piece.getPlacementOptions(), new RNG(), getData());
+        }, piece.getPlacementOptions(), getStructure().getRng(), getData());
     }
 }

src/main/java/com/volmit/iris/scaffold/jigsaw/PlannedStructure.java

@@ -162,14 +162,15 @@ public class PlannedStructure {
                 {
                     if(j.getSpawnEntity() != null)
                     {
+                        IrisAccess a = IrisWorlds.access(world);
+                        if (a == null) {
+                            Iris.warn("Cannot spawn entities from jigsaw in non Iris world!");
+                            break;
+                        }
                         IrisPosition p = i.getWorldPosition(j).add(new IrisPosition(j.getDirection().toVector().multiply(2)));
                         IrisEntity e = getData().getEntityLoader().load(j.getSpawnEntity());
-                        IrisAccess a = IrisWorlds.access(world);
 
-                        if(a != null)
-                        {
-                            e.spawn(a.getCompound().getEngineForHeight(p.getY()), new Location(world, p.getX(), p.getY(), p.getZ()), rng);
-                        }
+                        e.spawn(a.getCompound().getEngineForHeight(p.getY()), new Location(world, p.getX() + 0.5, p.getY(), p.getZ() + 0.5), rng);
                     }
                 }
             });