PaperMC/patches/server/0102-LootTable-API-and-replenishable-lootables.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 1 May 2016 21:19:14 -0400
Subject: [PATCH] LootTable API and replenishable lootables

Provides an API to control the loot table for an object.
Also provides a feature that any Lootable Inventory (Chests in Structures)
can automatically replenish after a given time.

This feature is good for long term worlds so that newer players
do not suffer with "Every chest has been looted"

== AT ==
public org.bukkit.craftbukkit.block.CraftBlockEntityState getTileEntity()Lnet/minecraft/world/level/block/entity/BlockEntity;
public org.bukkit.craftbukkit.block.CraftLootable setLootTable(Lorg/bukkit/loot/LootTable;J)V
public org.bukkit.craftbukkit.entity.CraftMinecartContainer setLootTable(Lorg/bukkit/loot/LootTable;J)V

diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperContainerEntityLootableInventory.java b/src/main/java/com/destroystokyo/paper/loottable/PaperContainerEntityLootableInventory.java
new file mode 100644
index 0000000000000000000000000000000000000000..9ca389ca789dc54bba3542cac0aac2e1dc66c870
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperContainerEntityLootableInventory.java
@@ -0,0 +1,63 @@
+package com.destroystokyo.paper.loottable;
+
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.vehicle.AbstractMinecartContainer;
+import net.minecraft.world.entity.vehicle.ContainerEntity;
+import net.minecraft.world.level.Level;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+
+public class PaperContainerEntityLootableInventory implements PaperLootableEntityInventory {
+
+    private final ContainerEntity entity;
+
+    public PaperContainerEntityLootableInventory(ContainerEntity entity) {
+        this.entity = entity;
+    }
+
+    @Override
+    public org.bukkit.loot.LootTable getLootTable() {
+        return entity.getLootTable() != null ? Bukkit.getLootTable(CraftNamespacedKey.fromMinecraft(entity.getLootTable())) : null;
+    }
+
+    @Override
+    public void setLootTable(org.bukkit.loot.LootTable table, long seed) {
+        setLootTable(table);
+        setSeed(seed);
+    }
+
+    @Override
+    public void setSeed(long seed) {
+        entity.setLootTableSeed(seed);
+    }
+
+    @Override
+    public long getSeed() {
+        return entity.getLootTableSeed();
+    }
+
+    @Override
+    public void setLootTable(org.bukkit.loot.LootTable table) {
+        entity.setLootTable((table == null) ? null : CraftNamespacedKey.toMinecraft(table.getKey()));
+    }
+
+    @Override
+    public PaperLootableInventoryData getLootableData() {
+        return entity.getLootableData();
+    }
+
+    @Override
+    public Entity getHandle() {
+        return entity.getEntity();
+    }
+
+    @Override
+    public LootableInventory getAPILootableInventory() {
+        return (LootableInventory) entity.getEntity().getBukkitEntity();
+    }
+
+    @Override
+    public Level getNMSWorld() {
+        return entity.level();
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperLootableBlockInventory.java b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableBlockInventory.java
new file mode 100644
index 0000000000000000000000000000000000000000..24c6ff57cd25533e71f8a1d0b3c0ece2fdbbf87e
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableBlockInventory.java
@@ -0,0 +1,33 @@
+package com.destroystokyo.paper.loottable;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.entity.RandomizableContainerBlockEntity;
+import org.bukkit.Chunk;
+import org.bukkit.block.Block;
+
+public interface PaperLootableBlockInventory extends LootableBlockInventory, PaperLootableInventory {
+
+    RandomizableContainerBlockEntity getTileEntity();
+
+    @Override
+    default LootableInventory getAPILootableInventory() {
+        return this;
+    }
+
+    @Override
+    default Level getNMSWorld() {
+        return this.getTileEntity().getLevel();
+    }
+
+    default Block getBlock() {
+        final BlockPos position = this.getTileEntity().getBlockPos();
+        final Chunk bukkitChunk = this.getBukkitWorld().getChunkAt(org.bukkit.craftbukkit.block.CraftBlock.at(this.getNMSWorld(), position));
+        return bukkitChunk.getBlock(position.getX(), position.getY(), position.getZ());
+    }
+
+    @Override
+    default PaperLootableInventoryData getLootableData() {
+        return this.getTileEntity().lootableData;
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperLootableEntityInventory.java b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableEntityInventory.java
new file mode 100644
index 0000000000000000000000000000000000000000..2fba5bc0f982e143ad5f5bda55d768edc5f847df
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableEntityInventory.java
@@ -0,0 +1,28 @@
+package com.destroystokyo.paper.loottable;
+
+import net.minecraft.world.level.Level;
+import org.bukkit.entity.Entity;
+
+public interface PaperLootableEntityInventory extends LootableEntityInventory, PaperLootableInventory {
+
+    net.minecraft.world.entity.Entity getHandle();
+
+    @Override
+    default LootableInventory getAPILootableInventory() {
+        return this;
+    }
+
+    default Entity getEntity() {
+        return getHandle().getBukkitEntity();
+    }
+
+    @Override
+    default Level getNMSWorld() {
+        return getHandle().getCommandSenderWorld();
+    }
+
+    @Override
+    default PaperLootableInventoryData getLootableData() {
+        return getHandle().lootableData;
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventory.java b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventory.java
new file mode 100644
index 0000000000000000000000000000000000000000..8e6dac2cef7af26ad74928eff631c1826c2980bb
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventory.java
@@ -0,0 +1,75 @@
+package com.destroystokyo.paper.loottable;
+
+import org.bukkit.loot.Lootable;
+import java.util.UUID;
+import net.minecraft.world.level.Level;
+
+public interface PaperLootableInventory extends LootableInventory, Lootable {
+
+    PaperLootableInventoryData getLootableData();
+    LootableInventory getAPILootableInventory();
+
+    Level getNMSWorld();
+
+    default org.bukkit.World getBukkitWorld() {
+        return getNMSWorld().getWorld();
+    }
+
+    @Override
+    default boolean isRefillEnabled() {
+        return getNMSWorld().paperConfig().lootables.autoReplenish;
+    }
+
+    @Override
+    default boolean hasBeenFilled() {
+        return getLastFilled() != -1;
+    }
+
+    @Override
+    default boolean hasPlayerLooted(UUID player) {
+        return getLootableData().hasPlayerLooted(player);
+    }
+
+    @Override
+    default boolean canPlayerLoot(final UUID player) {
+        return getLootableData().canPlayerLoot(player, this.getNMSWorld().paperConfig());
+    }
+
+    @Override
+    default Long getLastLooted(UUID player) {
+        return getLootableData().getLastLooted(player);
+    }
+
+    @Override
+    default boolean setHasPlayerLooted(UUID player, boolean looted) {
+        final boolean hasLooted = hasPlayerLooted(player);
+        if (hasLooted != looted) {
+            getLootableData().setPlayerLootedState(player, looted);
+        }
+        return hasLooted;
+    }
+
+    @Override
+    default boolean hasPendingRefill() {
+        long nextRefill = getLootableData().getNextRefill();
+        return nextRefill != -1 && nextRefill > getLootableData().getLastFill();
+    }
+
+    @Override
+    default long getLastFilled() {
+        return getLootableData().getLastFill();
+    }
+
+    @Override
+    default long getNextRefill() {
+        return getLootableData().getNextRefill();
+    }
+
+    @Override
+    default long setNextRefill(long refillAt) {
+        if (refillAt < -1) {
+            refillAt = -1;
+        }
+        return getLootableData().setNextRefill(refillAt);
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventoryData.java b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventoryData.java
new file mode 100644
index 0000000000000000000000000000000000000000..6e72c43b9d3834eb91c02ce68e7d114ad907812d
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperLootableInventoryData.java
@@ -0,0 +1,188 @@
+package com.destroystokyo.paper.loottable;
+
+import io.papermc.paper.configuration.WorldConfiguration;
+import io.papermc.paper.configuration.type.DurationOrDisabled;
+import java.time.temporal.ChronoUnit;
+import java.util.concurrent.TimeUnit;
+import org.bukkit.entity.Player;
+import org.bukkit.loot.LootTable;
+import javax.annotation.Nullable;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+import java.util.UUID;
+
+public class PaperLootableInventoryData {
+
+    private static final Random RANDOM = new Random();
+
+    private long lastFill = -1;
+    private long nextRefill = -1;
+    private int numRefills = 0;
+    private Map<UUID, Long> lootedPlayers;
+    private final PaperLootableInventory lootable;
+
+    public PaperLootableInventoryData(PaperLootableInventory lootable) {
+        this.lootable = lootable;
+    }
+
+    long getLastFill() {
+        return this.lastFill;
+    }
+
+    long getNextRefill() {
+        return this.nextRefill;
+    }
+
+    long setNextRefill(long nextRefill) {
+        long prev = this.nextRefill;
+        this.nextRefill = nextRefill;
+        return prev;
+    }
+
+    public boolean shouldReplenish(@Nullable net.minecraft.world.entity.player.Player player) {
+        LootTable table = this.lootable.getLootTable();
+
+        // No Loot Table associated
+        if (table == null) {
+            return false;
+        }
+
+        // ALWAYS process the first fill or if the feature is disabled
+        if (this.lastFill == -1 || !this.lootable.getNMSWorld().paperConfig().lootables.autoReplenish) {
+            return true;
+        }
+
+        // Only process refills when a player is set
+        if (player == null) {
+            return false;
+        }
+
+        // Chest is not scheduled for refill
+        if (this.nextRefill == -1) {
+            return false;
+        }
+
+        final WorldConfiguration paperConfig = this.lootable.getNMSWorld().paperConfig();
+
+        // Check if max refills has been hit
+        if (paperConfig.lootables.maxRefills != -1 && this.numRefills >= paperConfig.lootables.maxRefills) {
+            return false;
+        }
+
+        // Refill has not been reached
+        if (this.nextRefill > System.currentTimeMillis()) {
+            return false;
+        }
+
+
+        final Player bukkitPlayer = (Player) player.getBukkitEntity();
+        LootableInventoryReplenishEvent event = new LootableInventoryReplenishEvent(bukkitPlayer, lootable.getAPILootableInventory());
+        event.setCancelled(!canPlayerLoot(player.getUUID(), paperConfig));
+        return event.callEvent();
+    }
+    public void processRefill(@Nullable net.minecraft.world.entity.player.Player player) {
+        this.lastFill = System.currentTimeMillis();
+        final WorldConfiguration paperConfig = this.lootable.getNMSWorld().paperConfig();
+        if (paperConfig.lootables.autoReplenish) {
+            long min = paperConfig.lootables.refreshMin.seconds();
+            long max = paperConfig.lootables.refreshMax.seconds();
+            this.nextRefill = this.lastFill + (min + RANDOM.nextLong(max - min + 1)) * 1000L;
+            this.numRefills++;
+            if (paperConfig.lootables.resetSeedOnFill) {
+                this.lootable.setSeed(0);
+            }
+            if (player != null) { // This means that numRefills can be incremented without a player being in the lootedPlayers list - Seems to be EntityMinecartChest specific
+                this.setPlayerLootedState(player.getUUID(), true);
+            }
+        } else {
+            this.lootable.clearLootTable();
+        }
+    }
+
+
+    public void loadNbt(CompoundTag base) {
+        if (!base.contains("Paper.LootableData", 10)) { // 10 = compound
+            return;
+        }
+        CompoundTag comp = base.getCompound("Paper.LootableData");
+        if (comp.contains("lastFill")) {
+            this.lastFill = comp.getLong("lastFill");
+        }
+        if (comp.contains("nextRefill")) {
+            this.nextRefill = comp.getLong("nextRefill");
+        }
+
+        if (comp.contains("numRefills")) {
+            this.numRefills = comp.getInt("numRefills");
+        }
+        if (comp.contains("lootedPlayers", net.minecraft.nbt.Tag.TAG_LIST)) {
+            ListTag list = comp.getList("lootedPlayers", net.minecraft.nbt.Tag.TAG_COMPOUND);
+            final int size = list.size();
+            if (size > 0) {
+                this.lootedPlayers = new HashMap<>(list.size());
+            }
+            for (int i = 0; i < size; i++) {
+                final CompoundTag cmp = list.getCompound(i);
+                lootedPlayers.put(cmp.getUUID("UUID"), cmp.getLong("Time"));
+            }
+        }
+    }
+    public void saveNbt(CompoundTag base) {
+        CompoundTag comp = new CompoundTag();
+        if (this.nextRefill != -1) {
+            comp.putLong("nextRefill", this.nextRefill);
+        }
+        if (this.lastFill != -1) {
+            comp.putLong("lastFill", this.lastFill);
+        }
+        if (this.numRefills != 0) {
+            comp.putInt("numRefills", this.numRefills);
+        }
+        if (this.lootedPlayers != null && !this.lootedPlayers.isEmpty()) {
+            ListTag list = new ListTag();
+            for (Map.Entry<UUID, Long> entry : this.lootedPlayers.entrySet()) {
+                CompoundTag cmp = new CompoundTag();
+                cmp.putUUID("UUID", entry.getKey());
+                cmp.putLong("Time", entry.getValue());
+                list.add(cmp);
+            }
+            comp.put("lootedPlayers", list);
+        }
+
+        if (!comp.isEmpty()) {
+            base.put("Paper.LootableData", comp);
+        }
+    }
+
+    void setPlayerLootedState(UUID player, boolean looted) {
+        if (looted && this.lootedPlayers == null) {
+            this.lootedPlayers = new HashMap<>();
+        }
+        if (looted) {
+            this.lootedPlayers.put(player, System.currentTimeMillis());
+        } else if (this.lootedPlayers != null) {
+            this.lootedPlayers.remove(player);
+        }
+    }
+
+    boolean canPlayerLoot(final UUID player, final WorldConfiguration worldConfiguration) {
+        final Long lastLooted = getLastLooted(player);
+        if (!worldConfiguration.lootables.restrictPlayerReloot || lastLooted == null) return true;
+
+        final DurationOrDisabled restrictPlayerRelootTime = worldConfiguration.lootables.restrictPlayerRelootTime;
+        if (restrictPlayerRelootTime.value().isEmpty()) return false;
+
+        return TimeUnit.SECONDS.toMillis(restrictPlayerRelootTime.value().get().seconds()) + lastLooted < System.currentTimeMillis();
+    }
+
+    boolean hasPlayerLooted(UUID player) {
+        return this.lootedPlayers != null && this.lootedPlayers.containsKey(player);
+    }
+
+    Long getLastLooted(UUID player) {
+        return lootedPlayers != null ? lootedPlayers.get(player) : null;
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/loottable/PaperTileEntityLootableInventory.java b/src/main/java/com/destroystokyo/paper/loottable/PaperTileEntityLootableInventory.java
new file mode 100644
index 0000000000000000000000000000000000000000..9cfa5d36a6991067a3866e0d437749fafcc0158e
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/loottable/PaperTileEntityLootableInventory.java
@@ -0,0 +1,65 @@
+package com.destroystokyo.paper.loottable;
+
+import io.papermc.paper.util.MCUtil;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.entity.RandomizableContainerBlockEntity;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+
+public class PaperTileEntityLootableInventory implements PaperLootableBlockInventory {
+    private RandomizableContainerBlockEntity tileEntityLootable;
+
+    public PaperTileEntityLootableInventory(RandomizableContainerBlockEntity tileEntityLootable) {
+        this.tileEntityLootable = tileEntityLootable;
+    }
+
+    @Override
+    public org.bukkit.loot.LootTable getLootTable() {
+        return tileEntityLootable.lootTable != null ? Bukkit.getLootTable(CraftNamespacedKey.fromMinecraft(tileEntityLootable.lootTable)) : null;
+    }
+
+    @Override
+    public void setLootTable(org.bukkit.loot.LootTable table, long seed) {
+        setLootTable(table);
+        setSeed(seed);
+    }
+
+    @Override
+    public void setLootTable(org.bukkit.loot.LootTable table) {
+        tileEntityLootable.lootTable = (table == null) ? null : CraftNamespacedKey.toMinecraft(table.getKey());
+    }
+
+    @Override
+    public void setSeed(long seed) {
+        tileEntityLootable.lootTableSeed = seed;
+    }
+
+    @Override
+    public long getSeed() {
+        return tileEntityLootable.lootTableSeed;
+    }
+
+    @Override
+    public PaperLootableInventoryData getLootableData() {
+        return tileEntityLootable.lootableData;
+    }
+
+    @Override
+    public RandomizableContainerBlockEntity getTileEntity() {
+        return tileEntityLootable;
+    }
+
+    @Override
+    public LootableInventory getAPILootableInventory() {
+        Level world = tileEntityLootable.getLevel();
+        if (world == null) {
+            return null;
+        }
+        return (LootableInventory) getBukkitWorld().getBlockAt(MCUtil.toLocation(world, tileEntityLootable.getBlockPos())).getState();
+    }
+
+    @Override
+    public Level getNMSWorld() {
+        return tileEntityLootable.getLevel();
+    }
+}
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index bc098b6a9c0e3b19b9154ab3727949232bddb20a..10687787a5fd1a81ad5a625848db4649381eab67 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -242,6 +242,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
     }
     // Paper end - Share random for entities to make them more random
 
+    public com.destroystokyo.paper.loottable.PaperLootableInventoryData lootableData; // Paper
     private CraftEntity bukkitEntity;
 
     public CraftEntity getBukkitEntity() {
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecartContainer.java b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecartContainer.java
index 67840327e934b631a85cf2d64911f5cfab4402b1..2704389bc3ec6dbbf1b568a4380972f8c0d62d15 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecartContainer.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecartContainer.java
@@ -35,6 +35,20 @@ public abstract class AbstractMinecartContainer extends AbstractMinecart impleme
     public ResourceKey<LootTable> lootTable;
     public long lootTableSeed;
 
+    // Paper start
+    {
+        this.lootableData = new com.destroystokyo.paper.loottable.PaperLootableInventoryData(new com.destroystokyo.paper.loottable.PaperContainerEntityLootableInventory(this));
+    }
+    @Override
+    public Entity getEntity() {
+        return this;
+    }
+
+    @Override
+    public com.destroystokyo.paper.loottable.PaperLootableInventoryData getLootableData() {
+        return this.lootableData;
+    }
+    // Paper end
     // CraftBukkit start
     public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
     private int maxStack = MAX_STACK;
@@ -144,12 +158,14 @@ public abstract class AbstractMinecartContainer extends AbstractMinecart impleme
     @Override
     protected void addAdditionalSaveData(CompoundTag nbt) {
         super.addAdditionalSaveData(nbt);
+        this.lootableData.saveNbt(nbt); // Paper
         this.addChestVehicleSaveData(nbt, this.registryAccess());
     }
 
     @Override
     protected void readAdditionalSaveData(CompoundTag nbt) {
         super.readAdditionalSaveData(nbt);
+        this.lootableData.loadNbt(nbt); // Paper
         this.readChestVehicleSaveData(nbt, this.registryAccess());
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/ChestBoat.java b/src/main/java/net/minecraft/world/entity/vehicle/ChestBoat.java
index 025e57993b85402c48db29d65ea3ceaf277ff27a..b04f7ce0805453f6c737fa9dc11c4129ca64e934 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/ChestBoat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/ChestBoat.java
@@ -70,12 +70,14 @@ public class ChestBoat extends Boat implements HasCustomInventoryScreen, Contain
     @Override
     protected void addAdditionalSaveData(CompoundTag nbt) {
         super.addAdditionalSaveData(nbt);
+        this.lootableData.saveNbt(nbt); // Paper
         this.addChestVehicleSaveData(nbt, this.registryAccess());
     }
 
     @Override
     protected void readAdditionalSaveData(CompoundTag nbt) {
         super.readAdditionalSaveData(nbt);
+        this.lootableData.loadNbt(nbt); // Paper
         this.readChestVehicleSaveData(nbt, this.registryAccess());
     }
 
@@ -257,6 +259,20 @@ public class ChestBoat extends Boat implements HasCustomInventoryScreen, Contain
         this.level().gameEvent((Holder) GameEvent.CONTAINER_CLOSE, this.position(), GameEvent.Context.of((Entity) player));
     }
 
+    // Paper start
+    {
+        this.lootableData = new com.destroystokyo.paper.loottable.PaperLootableInventoryData(new com.destroystokyo.paper.loottable.PaperContainerEntityLootableInventory(this));
+    }
+    @Override
+    public Entity getEntity() {
+        return this;
+    }
+
+    @Override
+    public com.destroystokyo.paper.loottable.PaperLootableInventoryData getLootableData() {
+        return this.lootableData;
+    }
+    // Paper end
     // CraftBukkit start
     public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
     private int maxStack = MAX_STACK;
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
index dbde2402fd46b0d06e8efeb90be6fb98d7ae7798..f33e5cf6d456e615050047e924d9b24268a2c51e 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
@@ -65,9 +65,8 @@ public interface ContainerEntity extends Container, MenuProvider {
             if (this.getLootTableSeed() != 0L) {
                 nbt.putLong("LootTableSeed", this.getLootTableSeed());
             }
-        } else {
-            ContainerHelper.saveAllItems(nbt, this.getItemStacks(), registriesLookup);
         }
+        ContainerHelper.saveAllItems(nbt, this.getItemStacks(), registriesLookup); // Paper - always save the items, table may still remain
     }
 
     default void readChestVehicleSaveData(CompoundTag nbt, HolderLookup.Provider registriesLookup) {
@@ -75,9 +74,8 @@ public interface ContainerEntity extends Container, MenuProvider {
         if (nbt.contains("LootTable", 8)) {
             this.setLootTable(ResourceKey.create(Registries.LOOT_TABLE, new ResourceLocation(nbt.getString("LootTable"))));
             this.setLootTableSeed(nbt.getLong("LootTableSeed"));
-        } else {
-            ContainerHelper.loadAllItems(nbt, this.getItemStacks(), registriesLookup);
         }
+        ContainerHelper.loadAllItems(nbt, this.getItemStacks(), registriesLookup); // Paper - always save the items, table may still remain
     }
 
     default void chestVehicleDestroyed(DamageSource source, Level world, Entity vehicle) {
@@ -99,13 +97,13 @@ public interface ContainerEntity extends Container, MenuProvider {
 
     default void unpackChestVehicleLootTable(@Nullable Player player) {
         MinecraftServer minecraftServer = this.level().getServer();
-        if (this.getLootTable() != null && minecraftServer != null) {
+        if (this.getLootableData().shouldReplenish(player) && minecraftServer != null) { // Paper
             LootTable lootTable = minecraftServer.reloadableRegistries().getLootTable(this.getLootTable());
             if (player != null) {
                 CriteriaTriggers.GENERATE_LOOT.trigger((ServerPlayer)player, this.getLootTable());
             }
 
-            this.setLootTable(null);
+            this.getLootableData().processRefill(player); // Paper
             LootParams.Builder builder = new LootParams.Builder((ServerLevel)this.level()).withParameter(LootContextParams.ORIGIN, this.position());
             if (player != null) {
                 builder.withLuck(player.getLuck()).withParameter(LootContextParams.THIS_ENTITY, player);
@@ -175,4 +173,13 @@ public interface ContainerEntity extends Container, MenuProvider {
     default boolean isChestVehicleStillValid(Player player) {
         return !this.isRemoved() && player.canInteractWithEntity(this.getBoundingBox(), 4.0);
     }
+    // Paper start
+    default Entity getEntity() {
+        throw new UnsupportedOperationException();
+    }
+
+    default com.destroystokyo.paper.loottable.PaperLootableInventoryData getLootableData() {
+        throw new UnsupportedOperationException();
+    }
+    // Paper end
 }
diff --git a/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
index c2493c15d8fe4587d6ee2db100cc13303b66b39b..5b183f12717008dd6c9863938c17b2e668ebded4 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
@@ -19,6 +19,7 @@ public abstract class RandomizableContainerBlockEntity extends BaseContainerBloc
     @Nullable
     public ResourceKey<LootTable> lootTable;
     public long lootTableSeed = 0L;
+    public final com.destroystokyo.paper.loottable.PaperLootableInventoryData lootableData = new com.destroystokyo.paper.loottable.PaperLootableInventoryData(new com.destroystokyo.paper.loottable.PaperTileEntityLootableInventory(this)); // Paper
 
     protected RandomizableContainerBlockEntity(BlockEntityType<?> type, BlockPos pos, BlockState state) {
         super(type, pos, state);
@@ -45,6 +46,56 @@ public abstract class RandomizableContainerBlockEntity extends BaseContainerBloc
         this.lootTableSeed = lootTableSeed;
     }
 
+    // Paper start
+    @Override
+    public boolean tryLoadLootTable(final net.minecraft.nbt.CompoundTag nbt) {
+        // Copied from super with changes, always check the original method
+        this.lootableData.loadNbt(nbt); // Paper
+        if (nbt.contains("LootTable", 8)) {
+            this.setLootTable(net.minecraft.Optionull.map(net.minecraft.resources.ResourceLocation.tryParse(nbt.getString("LootTable")), rl -> ResourceKey.create(net.minecraft.core.registries.Registries.LOOT_TABLE, rl)));
+            try { if (this.lootTable != null) org.bukkit.craftbukkit.util.CraftNamespacedKey.fromMinecraft(this.lootTable.location()); } catch (IllegalArgumentException ex) { this.lootTable = null; } // Paper - validate
+            if (nbt.contains("LootTableSeed", 4)) {
+                this.setLootTableSeed(nbt.getLong("LootTableSeed"));
+            } else {
+                this.setLootTableSeed(0L);
+            }
+            return false; // Paper - always load the items, table may still remain
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public boolean trySaveLootTable(final net.minecraft.nbt.CompoundTag nbt) {
+        this.lootableData.saveNbt(nbt);
+        RandomizableContainer.super.trySaveLootTable(nbt);
+        return false;
+    }
+
+    @Override
+    public void unpackLootTable(@org.jetbrains.annotations.Nullable final Player player) {
+        // Copied from super with changes, always check the original method
+        net.minecraft.world.level.Level level = this.getLevel();
+        BlockPos blockPos = this.getBlockPos();
+        ResourceKey<LootTable> resourceKey = this.getLootTable();
+        if (this.lootableData.shouldReplenish(player) && resourceKey != null && level != null && level.getServer() != null) { // Paper
+            net.minecraft.world.level.storage.loot.LootTable lootTable = level.getServer().reloadableRegistries().getLootTable(resourceKey);
+            if (player instanceof net.minecraft.server.level.ServerPlayer) {
+                net.minecraft.advancements.CriteriaTriggers.GENERATE_LOOT.trigger((net.minecraft.server.level.ServerPlayer)player, resourceKey);
+            }
+
+            this.lootableData.processRefill(player); // Paper
+            net.minecraft.world.level.storage.loot.LootParams.Builder builder = (new net.minecraft.world.level.storage.loot.LootParams.Builder((net.minecraft.server.level.ServerLevel)level)).withParameter(net.minecraft.world.level.storage.loot.parameters.LootContextParams.ORIGIN, net.minecraft.world.phys.Vec3.atCenterOf(blockPos));
+            if (player != null) {
+                builder.withLuck(player.getLuck()).withParameter(net.minecraft.world.level.storage.loot.parameters.LootContextParams.THIS_ENTITY, player);
+            }
+
+            lootTable.fill(this, builder.create(net.minecraft.world.level.storage.loot.parameters.LootContextParamSets.CHEST), this.getLootTableSeed());
+        }
+
+    }
+    // Paper end
+
     @Override
     public boolean isEmpty() {
         this.unpackLootTable(null);
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBrushableBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBrushableBlock.java
index 949e074a32b6593bd8b7405499e686a074e283e5..398ffe274bddee2b01350b9490def3d2fe854917 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBrushableBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBrushableBlock.java
@@ -58,7 +58,7 @@ public class CraftBrushableBlock extends CraftBlockEntityState<BrushableBlockEnt
         this.setLootTable(this.getLootTable(), seed);
     }
 
-    private void setLootTable(LootTable table, long seed) {
+    public void setLootTable(LootTable table, long seed) { // Paper - make public since it overrides a public method
         this.getSnapshot().setLootTable(CraftLootTable.bukkitToMinecraft(table), seed);
     }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftChest.java b/src/main/java/org/bukkit/craftbukkit/block/CraftChest.java
index 2b6a93a944b27290745278957a3577772b7b8212..29df470d6706a33dad4317a9aa599456d5c7f6ee 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftChest.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftChest.java
@@ -13,8 +13,9 @@ import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.inventory.CraftInventory;
 import org.bukkit.craftbukkit.inventory.CraftInventoryDoubleChest;
 import org.bukkit.inventory.Inventory;
+import com.destroystokyo.paper.loottable.PaperLootableBlockInventory; // Paper
 
-public class CraftChest extends CraftLootable<ChestBlockEntity> implements Chest {
+public class CraftChest extends CraftLootable<ChestBlockEntity> implements Chest, PaperLootableBlockInventory { // Paper
 
     public CraftChest(World world, ChestBlockEntity tileEntity) {
         super(world, tileEntity);
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftLootable.java b/src/main/java/org/bukkit/craftbukkit/block/CraftLootable.java
index 74315a46f6101775321b1cf4944c124c69aed182..c3215f15b3088199dcf96f62b58d0ec7c2b4125c 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftLootable.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftLootable.java
@@ -8,7 +8,7 @@ import org.bukkit.craftbukkit.CraftLootTable;
 import org.bukkit.loot.LootTable;
 import org.bukkit.loot.Lootable;
 
-public abstract class CraftLootable<T extends RandomizableContainerBlockEntity> extends CraftContainer<T> implements Nameable, Lootable {
+public abstract class CraftLootable<T extends RandomizableContainerBlockEntity> extends CraftContainer<T> implements Nameable, Lootable, com.destroystokyo.paper.loottable.PaperLootableBlockInventory { // Paper
 
     public CraftLootable(World world, T tileEntity) {
         super(world, tileEntity);
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftChestBoat.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftChestBoat.java
index cfde210ea9d4b62fe514d3ab0dbab2f43eda0c7a..c0f6939ed782dd3151ebd7ee9d3d7e292154e76c 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftChestBoat.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftChestBoat.java
@@ -7,8 +7,7 @@ import org.bukkit.craftbukkit.inventory.CraftInventory;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.loot.LootTable;
 
-public class CraftChestBoat extends CraftBoat implements org.bukkit.entity.ChestBoat {
-
+public class CraftChestBoat extends CraftBoat implements org.bukkit.entity.ChestBoat, com.destroystokyo.paper.loottable.PaperLootableEntityInventory { // Paper
     private final Inventory inventory;
 
     public CraftChestBoat(CraftServer server, ChestBoat entity) {
@@ -51,7 +50,7 @@ public class CraftChestBoat extends CraftBoat implements org.bukkit.entity.Chest
         return this.getHandle().getLootTableSeed();
     }
 
-    private void setLootTable(LootTable table, long seed) {
+    public void setLootTable(LootTable table, long seed) { // Paper - change visibility since it overrides a public method
         this.getHandle().setLootTable(CraftLootTable.bukkitToMinecraft(table));
         this.getHandle().setLootTableSeed(seed);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartChest.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartChest.java
index fd42f0b20132d08039ca7735d31a61806a6b07dc..b1a708de6790bbe336202b13ab862ced78de084f 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartChest.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartChest.java
@@ -7,7 +7,7 @@ import org.bukkit.entity.minecart.StorageMinecart;
 import org.bukkit.inventory.Inventory;
 
 @SuppressWarnings("deprecation")
-public class CraftMinecartChest extends CraftMinecartContainer implements StorageMinecart {
+public class CraftMinecartChest extends CraftMinecartContainer implements StorageMinecart, com.destroystokyo.paper.loottable.PaperLootableEntityInventory { // Paper
     private final CraftInventory inventory;
 
     public CraftMinecartChest(CraftServer server, MinecartChest entity) {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartHopper.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartHopper.java
index 39427b4f284e9402663be2b160ccb5f03f8b91da..17f5684cba9d3ed22d9925d1951520cc4751dfe2 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartHopper.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartHopper.java
@@ -6,7 +6,7 @@ import org.bukkit.craftbukkit.inventory.CraftInventory;
 import org.bukkit.entity.minecart.HopperMinecart;
 import org.bukkit.inventory.Inventory;
 
-public final class CraftMinecartHopper extends CraftMinecartContainer implements HopperMinecart {
+public final class CraftMinecartHopper extends CraftMinecartContainer implements HopperMinecart, com.destroystokyo.paper.loottable.PaperLootableEntityInventory { // Paper
     private final CraftInventory inventory;
 
     public CraftMinecartHopper(CraftServer server, MinecartHopper entity) {