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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 ebe9b713905d33a4107fe32874a783e154bd0524..fee09e6ff72cf1da389d5811dd005642cd50a5b4 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
@@ -121,30 +121,47 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
         }
     }
 
+    private static final Predicate<net.minecraft.world.entity.LivingEntity> APPLY_WATER_GET_ENTITIES_PREDICATE = ThrownPotion.WATER_SENSITIVE.or(Axolotl.class::isInstance); // Paper
     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);
+        List<net.minecraft.world.entity.LivingEntity> list = this.level.getEntitiesOfClass(net.minecraft.world.entity.LivingEntity.class, axisalignedbb, ThrownPotion.APPLY_WATER_GET_ENTITIES_PREDICATE); // Paper
+        Map<LivingEntity, Double> affected = new HashMap<>(); // Paper
 
         if (!list.isEmpty()) {
             Iterator iterator = list.iterator();
 
             while (iterator.hasNext()) {
                 net.minecraft.world.entity.LivingEntity entityliving = (net.minecraft.world.entity.LivingEntity) iterator.next();
+                // Paper start - Change into single getEntities for axolotls & water sensitive
+                if (entityliving instanceof Axolotl axolotl) {
+                    affected.put(axolotl.getBukkitLivingEntity(), 1.0);
+                    continue;
+                }
+                // Paper end
                 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
+                    // Paper end
                 }
             }
         }
 
-        List<Axolotl> list1 = this.level.getEntitiesOfClass(Axolotl.class, axisalignedbb);
-        Iterator iterator1 = list1.iterator();
-
-        while (iterator1.hasNext()) {
-            Axolotl axolotl = (Axolotl) iterator1.next();
-
-            axolotl.rehydrate();
+        // Paper start
+        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();
+                if (entityliving instanceof Axolotl axolotl && event.getIntensity(affectedEntity) > 0) {
+                    axolotl.rehydrate();
+                } else {
+                    entityliving.hurt(DamageSource.indirectMagic(this, this.getOwner()), 1.0F);
+                }
+            }
+            // Paper end
         }
 
     }
@@ -165,6 +182,7 @@ 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) {