From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Tue, 29 Mar 2022 13:46:23 -0700
Subject: [PATCH] Fire CauldronLevelChange on initial fill

Also don't fire level events or game events if stalactite
drip is cancelled

diff --git a/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java b/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java
index 4c9334dde0734a3550a810845cee53f474e9c96b..ef7f1a871144f4a6897769f2459a4dd5eeffa5b4 100644
--- a/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java
+++ b/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java
@@ -80,7 +80,7 @@ public interface CauldronInteraction {
             } else {
                 if (!world.isClientSide) {
                     // CraftBukkit start
-                    if (!LayeredCauldronBlock.changeLevel(iblockdata, world, blockposition, Blocks.WATER_CAULDRON.defaultBlockState(), entityhuman, CauldronLevelChangeEvent.ChangeReason.BOTTLE_EMPTY)) {
+                    if (!LayeredCauldronBlock.changeLevel(iblockdata, world, blockposition, Blocks.WATER_CAULDRON.defaultBlockState(), entityhuman, CauldronLevelChangeEvent.ChangeReason.BOTTLE_EMPTY, false)) { // Paper
                         return InteractionResult.SUCCESS;
                     }
                     // CraftBukkit end
@@ -128,7 +128,7 @@ public interface CauldronInteraction {
             if ((Integer) iblockdata.getValue(LayeredCauldronBlock.LEVEL) != 3 && PotionUtils.getPotion(itemstack) == Potions.WATER) {
                 if (!world.isClientSide) {
                     // CraftBukkit start
-                    if (!LayeredCauldronBlock.changeLevel(iblockdata, world, blockposition, iblockdata.cycle(LayeredCauldronBlock.LEVEL), entityhuman, CauldronLevelChangeEvent.ChangeReason.BOTTLE_EMPTY)) {
+                    if (!LayeredCauldronBlock.changeLevel(iblockdata, world, blockposition, iblockdata.cycle(LayeredCauldronBlock.LEVEL), entityhuman, CauldronLevelChangeEvent.ChangeReason.BOTTLE_EMPTY, false)) { // Paper
                         return InteractionResult.SUCCESS;
                     }
                     // CraftBukkit end
@@ -212,7 +212,7 @@ public interface CauldronInteraction {
         } else {
             if (!world.isClientSide) {
                 // CraftBukkit start
-                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.CAULDRON.defaultBlockState(), player, CauldronLevelChangeEvent.ChangeReason.BUCKET_FILL)) {
+                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.CAULDRON.defaultBlockState(), player, CauldronLevelChangeEvent.ChangeReason.BUCKET_FILL, false)) { // Paper
                     return InteractionResult.SUCCESS;
                 }
                 // CraftBukkit end
@@ -233,7 +233,7 @@ public interface CauldronInteraction {
     static InteractionResult emptyBucket(Level world, BlockPos pos, Player player, InteractionHand hand, ItemStack stack, BlockState state, SoundEvent soundEvent) {
         if (!world.isClientSide) {
             // CraftBukkit start
-            if (!LayeredCauldronBlock.changeLevel(state, world, pos, state, player, CauldronLevelChangeEvent.ChangeReason.BUCKET_EMPTY)) {
+            if (!LayeredCauldronBlock.changeLevel(state, world, pos, state, player, CauldronLevelChangeEvent.ChangeReason.BUCKET_EMPTY, false)) { // Paper
                 return InteractionResult.SUCCESS;
             }
             // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/level/block/CauldronBlock.java b/src/main/java/net/minecraft/world/level/block/CauldronBlock.java
index 588b3e911d9b22dad2928ea9e32e8a8a3a8e9b96..a821a981adbebdcf22997731b9bbea3d033cd2b1 100644
--- a/src/main/java/net/minecraft/world/level/block/CauldronBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/CauldronBlock.java
@@ -43,10 +43,18 @@ public class CauldronBlock extends AbstractCauldronBlock {
     public void handlePrecipitation(BlockState state, Level world, BlockPos pos, Biome.Precipitation precipitation) {
         if (CauldronBlock.shouldHandlePrecipitation(world, precipitation)) {
             if (precipitation == Biome.Precipitation.RAIN) {
-                world.setBlockAndUpdate(pos, Blocks.WATER_CAULDRON.defaultBlockState());
+                // Paper start - call event for initial fill
+                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.WATER_CAULDRON.defaultBlockState(), null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL, false)) { // avoid duplicate game event
+                    return;
+                }
+                // Paper end
                 world.gameEvent((Entity) null, GameEvent.BLOCK_CHANGE, pos);
             } else if (precipitation == Biome.Precipitation.SNOW) {
-                world.setBlockAndUpdate(pos, Blocks.POWDER_SNOW_CAULDRON.defaultBlockState());
+                // Paper start - call event for initial fill
+                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.POWDER_SNOW_CAULDRON.defaultBlockState(), null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL, false)) { // avoid duplicate game event
+                    return;
+                }
+                // Paper end
                 world.gameEvent((Entity) null, GameEvent.BLOCK_CHANGE, pos);
             }
 
@@ -64,11 +72,19 @@ public class CauldronBlock extends AbstractCauldronBlock {
 
         if (fluid == Fluids.WATER) {
             iblockdata1 = Blocks.WATER_CAULDRON.defaultBlockState();
-            LayeredCauldronBlock.changeLevel(state, world, pos, iblockdata1, null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL); // CraftBukkit
+            // Paper start - don't send level event or game event if cancelled
+            if (!LayeredCauldronBlock.changeLevel(state, world, pos, iblockdata1, null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL)) { // CraftBukkit
+                return;
+            }
+            // Paper end
             world.levelEvent(1047, pos, 0);
         } else if (fluid == Fluids.LAVA) {
             iblockdata1 = Blocks.LAVA_CAULDRON.defaultBlockState();
-            LayeredCauldronBlock.changeLevel(state, world, pos, iblockdata1, null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL); // CraftBukkit
+            // Paper start - don't send level event or game event if cancelled
+            if (!LayeredCauldronBlock.changeLevel(state, world, pos, iblockdata1, null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL)) { // CraftBukkit
+                return;
+            }
+            // Paper end
             world.levelEvent(1046, pos, 0);
         }
 
diff --git a/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java b/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java
index a8b2c49ebf531d730d681ca3bceb4dc74b433fdb..7daf2ec30fd31023d326a6149661f38bfc1d646b 100644
--- a/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java
@@ -101,7 +101,13 @@ public class LayeredCauldronBlock extends AbstractCauldronBlock {
     }
 
     // CraftBukkit start
-    public static boolean changeLevel(BlockState iblockdata, Level world, BlockPos blockposition, BlockState newBlock, Entity entity, CauldronLevelChangeEvent.ChangeReason reason) {
+    // Paper start
+    public static boolean changeLevel(BlockState iblockdata, Level world, BlockPos blockposition, BlockState newBlock, @javax.annotation.Nullable Entity entity, CauldronLevelChangeEvent.ChangeReason reason) { // Paper - entity is nullable
+        return changeLevel(iblockdata, world, blockposition, newBlock, entity, reason, true);
+    }
+
+    public static boolean changeLevel(BlockState iblockdata, Level world, BlockPos blockposition, BlockState newBlock, @javax.annotation.Nullable Entity entity, CauldronLevelChangeEvent.ChangeReason reason, boolean sendGameEvent) { // Paper - entity is nullable
+    // Paper end
         CraftBlockState newState = CraftBlockStates.getBlockState(world, blockposition);
         newState.setData(newBlock);
 
@@ -114,7 +120,7 @@ public class LayeredCauldronBlock extends AbstractCauldronBlock {
             return false;
         }
         newState.update(true);
-        world.gameEvent(GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(newBlock));
+        if (sendGameEvent) world.gameEvent(GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(newBlock)); // Paper
         return true;
     }
     // CraftBukkit end