From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Fri, 19 Apr 2019 12:41:13 -0500
Subject: [PATCH] Mob Spawner API Enhancements


diff --git a/src/main/java/net/minecraft/world/level/BaseSpawner.java b/src/main/java/net/minecraft/world/level/BaseSpawner.java
index fe5e691ebbe930662f8a4f00811fdd8ed8ce1c52..b9e738542692aba7b78fc514ae8e3248df9998ea 100644
--- a/src/main/java/net/minecraft/world/level/BaseSpawner.java
+++ b/src/main/java/net/minecraft/world/level/BaseSpawner.java
@@ -31,7 +31,7 @@ public abstract class BaseSpawner {
 
     private static final Logger LOGGER = LogManager.getLogger();
     private static final int EVENT_SPAWN = 1;
-    private static WeightedRandomList<SpawnData> EMPTY_POTENTIALS = WeightedRandomList.create();
+    public static WeightedRandomList<SpawnData> EMPTY_POTENTIALS = WeightedRandomList.create(); // Paper - private->public
     public int spawnDelay = 20;
     public WeightedRandomList<SpawnData> spawnPotentials;
     public SpawnData nextSpawnData;
@@ -77,7 +77,7 @@ public abstract class BaseSpawner {
         this.spawnPotentials = BaseSpawner.EMPTY_POTENTIALS; // CraftBukkit - SPIGOT-3496, MC-92282
     }
 
-    private boolean isNearPlayer(Level world, BlockPos pos) {
+    public boolean isNearPlayer(Level world, BlockPos pos) { // Paper private->public
         return world.isAffectsSpawningPlayerNearby((double) pos.getX() + 0.5D, (double) pos.getY() + 0.5D, (double) pos.getZ() + 0.5D, (double) this.requiredPlayerRange); // Paper
     }
 
@@ -225,7 +225,7 @@ public abstract class BaseSpawner {
         }
     }
 
-    private void delay(Level world, BlockPos pos) {
+    public void delay(Level world, BlockPos pos) { // Paper private->public
         if (this.maxSpawnDelay <= this.minSpawnDelay) {
             this.spawnDelay = this.minSpawnDelay;
         } else {
@@ -239,7 +239,13 @@ public abstract class BaseSpawner {
     }
 
     public void load(@Nullable Level world, BlockPos pos, CompoundTag nbt) {
+        // Paper start - use larger int if set
+        if (nbt.contains("Paper.Delay")) {
+            this.spawnDelay = nbt.getInt("Paper.Delay");
+        } else {
         this.spawnDelay = nbt.getShort("Delay");
+        }
+        // Paper end
         List<SpawnData> list = Lists.newArrayList();
 
         if (nbt.contains("SpawnPotentials", 9)) {
@@ -258,10 +264,15 @@ public abstract class BaseSpawner {
                 this.setSpawnData(world, pos, mobspawnerdata);
             });
         }
-
+        // Paper start - use ints if set
+        if (nbt.contains("Paper.MinSpawnDelay", 99)) {
+            this.minSpawnDelay = nbt.getInt("Paper.MinSpawnDelay");
+            this.maxSpawnDelay = nbt.getInt("Paper.MaxSpawnDelay");
+            this.spawnCount = nbt.getShort("SpawnCount");
+        } else // Paper end
         if (nbt.contains("MinSpawnDelay", 99)) {
-            this.minSpawnDelay = nbt.getShort("MinSpawnDelay");
-            this.maxSpawnDelay = nbt.getShort("MaxSpawnDelay");
+            this.minSpawnDelay = nbt.getInt("MinSpawnDelay"); // Paper - short->int
+            this.maxSpawnDelay = nbt.getInt("MaxSpawnDelay"); // Paper - short->int
             this.spawnCount = nbt.getShort("SpawnCount");
         }
 
@@ -283,9 +294,20 @@ public abstract class BaseSpawner {
         if (minecraftkey == null) {
             return nbt;
         } else {
-            nbt.putShort("Delay", (short) this.spawnDelay);
-            nbt.putShort("MinSpawnDelay", (short) this.minSpawnDelay);
-            nbt.putShort("MaxSpawnDelay", (short) this.maxSpawnDelay);
+            // Paper start
+            if (spawnDelay > Short.MAX_VALUE) {
+                nbt.putInt("Paper.Delay", this.spawnDelay);
+            }
+            nbt.putShort("Delay", (short) Math.min(Short.MAX_VALUE, this.spawnDelay));
+
+            if (minSpawnDelay > Short.MAX_VALUE || maxSpawnDelay > Short.MAX_VALUE) {
+                nbt.putInt("Paper.MinSpawnDelay", this.minSpawnDelay);
+                nbt.putInt("Paper.MaxSpawnDelay", this.maxSpawnDelay);
+            }
+
+            nbt.putShort("MinSpawnDelay", (short) Math.min(Short.MAX_VALUE, this.minSpawnDelay));
+            nbt.putShort("MaxSpawnDelay", (short) Math.min(Short.MAX_VALUE, this.maxSpawnDelay));
+            // Paper end
             nbt.putShort("SpawnCount", (short) this.spawnCount);
             nbt.putShort("MaxNearbyEntities", (short) this.maxNearbyEntities);
             nbt.putShort("RequiredPlayerRange", (short) this.requiredPlayerRange);
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java b/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
index 38dc811970b8f90b11a2b0013da3b6b3b775cbec..6bc17063c7ed9da9a16e2f8ab6117d49729c9b28 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
@@ -116,4 +116,30 @@ public class CraftCreatureSpawner extends CraftBlockEntityState<SpawnerBlockEnti
     public void setSpawnRange(int spawnRange) {
         this.getSnapshot().getSpawner().spawnRange = spawnRange;
     }
+
+    // Paper start
+    @Override
+    public boolean isActivated() {
+        return this.getSnapshot().getSpawner().isNearPlayer(world.getHandle(), getPosition());
+    }
+
+    @Override
+    public void resetTimer() {
+        this.getSnapshot().getSpawner().delay(world.getHandle(), getPosition());
+    }
+
+    @Override
+    public void setSpawnedItem(org.bukkit.inventory.ItemStack itemStack) {
+        Preconditions.checkArgument(itemStack != null && !itemStack.getType().isAir(), "spawners cannot spawn air");
+        net.minecraft.world.item.ItemStack item = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(itemStack);
+        net.minecraft.nbt.CompoundTag compound = new net.minecraft.nbt.CompoundTag();
+        net.minecraft.nbt.CompoundTag entity = new net.minecraft.nbt.CompoundTag();
+        entity.putString("id", net.minecraft.core.Registry.ENTITY_TYPE.getKey(net.minecraft.world.entity.EntityType.ITEM).toString());
+        entity.put("Item", item.save(new net.minecraft.nbt.CompoundTag()));
+        compound.put("Entity", entity);
+        compound.putInt("Weight", this.getSnapshotNBT().contains("Weight", org.bukkit.craftbukkit.util.CraftMagicNumbers.NBT.TAG_ANY_NUMBER) ? this.getSnapshotNBT().getInt("Weight") : 1);
+        this.getSnapshot().getSpawner().setSpawnData(world.getHandle(), getPosition(), new net.minecraft.world.level.SpawnData(compound));
+        this.getSnapshot().getSpawner().spawnPotentials= net.minecraft.world.level.BaseSpawner.EMPTY_POTENTIALS;
+    }
+    // Paper end
 }