PaperMC/patches/server/0683-Fix-PotionSplashEvent-for-water-splash-potions.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 20 May 2021 20:40:53 -0700
Subject: [PATCH] Fix PotionSplashEvent for water splash potions

Fixes SPIGOT-6221: https://hub.spigotmc.org/jira/projects/SPIGOT/issues/SPIGOT-6221

diff --git a/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java b/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
index 517a0f6bf847c5bf01851ae326d1b12332c2672c..1adcc0321b5528a4a173027be67139a9e9be5770 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
@@ -125,6 +125,7 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
     private void applyWater() {
         AABB axisalignedbb = this.getBoundingBox().inflate(4.0D, 2.0D, 4.0D);
         List<net.minecraft.world.entity.LivingEntity> list = this.level.getEntitiesOfClass(net.minecraft.world.entity.LivingEntity.class, axisalignedbb, ThrownPotion.WATER_SENSITIVE);
+        Map<LivingEntity, Double> affected = new HashMap<>(); // Paper
 
         if (!list.isEmpty()) {
             Iterator iterator = list.iterator();
@@ -134,11 +135,23 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
                 double d0 = this.distanceToSqr((Entity) entityliving);
 
                 if (d0 < 16.0D && entityliving.isSensitiveToWater()) {
-                    entityliving.hurt(DamageSource.indirectMagic(this, this.getOwner()), 1.0F);
+                    // Paper start
+                    double intensity = 1.0D - Math.sqrt(d0) / 4.0D;
+                    affected.put(entityliving.getBukkitLivingEntity(), intensity);
+                    // entityliving.hurt(DamageSource.indirectMagic(this, this.getOwner()), 1.0F); // Paper - moved down
                 }
             }
         }
 
+        org.bukkit.event.entity.PotionSplashEvent event = CraftEventFactory.callPotionSplashEvent(this, affected);
+        if (!event.isCancelled()) {
+            for (LivingEntity affectedEntity : event.getAffectedEntities()) {
+                net.minecraft.world.entity.LivingEntity entityliving = ((CraftLivingEntity) affectedEntity).getHandle();
+                entityliving.hurt(DamageSource.indirectMagic(entityliving, this.getOwner()), 1.0F);
+            }
+        }
+        // Paper end
+
         List<Axolotl> list1 = this.level.getEntitiesOfClass(Axolotl.class, axisalignedbb);
         Iterator iterator1 = list1.iterator();
 
@@ -166,6 +179,7 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
                     double d0 = this.distanceToSqr((Entity) entityliving);
 
                     if (d0 < 16.0D) {
+                        // Paper - diff on change, used when calling the splash event for water splash potions
                         double d1 = 1.0D - Math.sqrt(d0) / 4.0D;
 
                         if (entityliving == entity) {