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 9ebd5310ee358acd83123a30415d9f7eb6aa36d9..f301c20e808b77cb3fcffd9a7c8102928306456e 100644
--- a/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java
+++ b/src/main/java/net/minecraft/core/cauldron/CauldronInteraction.java
@@ -81,7 +81,7 @@ public interface CauldronInteraction {
             if (potioncontents != null && potioncontents.is(Potions.WATER)) {
                 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 - Call CauldronLevelChangeEvent
                         return ItemInteractionResult.SUCCESS;
                     }
                     // CraftBukkit end
@@ -136,7 +136,7 @@ public interface CauldronInteraction {
                 if (potioncontents != null && potioncontents.is(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 - Call CauldronLevelChangeEvent
                             return ItemInteractionResult.SUCCESS;
                         }
                         // CraftBukkit end
@@ -222,7 +222,7 @@ 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 - Call CauldronLevelChangeEvent
                     return ItemInteractionResult.SUCCESS;
                 }
                 // CraftBukkit end
@@ -243,7 +243,7 @@ public interface CauldronInteraction {
     static ItemInteractionResult 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 - Call CauldronLevelChangeEvent
                 return ItemInteractionResult.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 8d5ad9848d9652b4fd7179c425c47a683ee169ef..c9968934f4ecaa8d81e545f279b3001c7b1ce545 100644
--- a/src/main/java/net/minecraft/world/level/block/CauldronBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/CauldronBlock.java
@@ -44,9 +44,19 @@ 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) {
+                // Paper start - Call CauldronLevelChangeEvent
+                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.WATER_CAULDRON.defaultBlockState(), null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL, false)) { // avoid duplicate game event
+                    return;
+                }
+                // Paper end - Call CauldronLevelChangeEvent
                 world.setBlockAndUpdate(pos, Blocks.WATER_CAULDRON.defaultBlockState());
                 world.gameEvent((Entity) null, (Holder) GameEvent.BLOCK_CHANGE, pos);
             } else if (precipitation == Biome.Precipitation.SNOW) {
+                // Paper start - Call CauldronLevelChangeEvent
+                if (!LayeredCauldronBlock.changeLevel(state, world, pos, Blocks.POWDER_SNOW_CAULDRON.defaultBlockState(), null, CauldronLevelChangeEvent.ChangeReason.NATURAL_FILL, false)) { // avoid duplicate game event
+                    return;
+                }
+                // Paper end - Call CauldronLevelChangeEvent
                 world.setBlockAndUpdate(pos, Blocks.POWDER_SNOW_CAULDRON.defaultBlockState());
                 world.gameEvent((Entity) null, (Holder) GameEvent.BLOCK_CHANGE, pos);
             }
@@ -65,11 +75,19 @@ 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 - Call CauldronLevelChangeEvent; 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 - Call CauldronLevelChangeEvent
             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 - Call CauldronLevelChangeEvent; 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 - Call CauldronLevelChangeEvent
             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 7c67efa6e344870b764eb39d5508190349e2e911..b222ac8e5b966c515be2aca86083f5640853cd29 100644
--- a/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/LayeredCauldronBlock.java
@@ -102,7 +102,13 @@ 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 - Call CauldronLevelChangeEvent
+    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 - Call CauldronLevelChangeEvent
         CraftBlockState newState = CraftBlockStates.getBlockState(world, blockposition);
         newState.setData(newBlock);
 
@@ -115,7 +121,7 @@ public class LayeredCauldronBlock extends AbstractCauldronBlock {
             return false;
         }
         newState.update(true);
-        world.gameEvent((Holder) GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(newBlock));
+        if (sendGameEvent) world.gameEvent((Holder) GameEvent.BLOCK_CHANGE, blockposition, GameEvent.Context.of(newBlock)); // Paper - Call CauldronLevelChangeEvent
         return true;
     }
     // CraftBukkit end