From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Fri, 19 Mar 2021 23:39:09 -0400
Subject: [PATCH] Add ElderGuardianAppearanceEvent


diff --git a/src/main/java/net/minecraft/world/effect/MobEffectUtil.java b/src/main/java/net/minecraft/world/effect/MobEffectUtil.java
index fd803cbdad0e75f43279c5d5049b0152c2d013c3..2902a06b06bedf4fba42ac37a5371b0b353e0e98 100644
--- a/src/main/java/net/minecraft/world/effect/MobEffectUtil.java
+++ b/src/main/java/net/minecraft/world/effect/MobEffectUtil.java
@@ -54,10 +54,23 @@ public final class MobEffectUtil {
     }
 
     public static List<ServerPlayer> addEffectToPlayersAround(ServerLevel worldserver, @Nullable Entity entity, Vec3 vec3d, double d0, MobEffectInstance mobeffect, int i, org.bukkit.event.entity.EntityPotionEffectEvent.Cause cause) {
+        // Paper start
+        return addEffectToPlayersAround(worldserver, entity, vec3d, d0, mobeffect, i, cause, null);
+    }
+
+    public static List<ServerPlayer> addEffectToPlayersAround(ServerLevel worldserver, @Nullable Entity entity, Vec3 vec3d, double d0, MobEffectInstance mobeffect, int i, org.bukkit.event.entity.EntityPotionEffectEvent.Cause cause, @Nullable java.util.function.Predicate<ServerPlayer> playerPredicate) {
+        // Paper end
         // CraftBukkit end
         MobEffect mobeffectlist = mobeffect.getEffect();
         List<ServerPlayer> list = worldserver.getPlayers((entityplayer) -> {
-            return entityplayer.gameMode.isSurvival() && (entity == null || !entity.isAlliedTo((Entity) entityplayer)) && vec3d.closerThan(entityplayer.position(), d0) && (!entityplayer.hasEffect(mobeffectlist) || entityplayer.getEffect(mobeffectlist).getAmplifier() < mobeffect.getAmplifier() || entityplayer.getEffect(mobeffectlist).endsWithin(i - 1));
+            // Paper start
+            boolean condition = entityplayer.gameMode.isSurvival() && (entity == null || !entity.isAlliedTo((Entity) entityplayer)) && vec3d.closerThan(entityplayer.position(), d0) && (!entityplayer.hasEffect(mobeffectlist) || entityplayer.getEffect(mobeffectlist).getAmplifier() < mobeffect.getAmplifier() || entityplayer.getEffect(mobeffectlist).endsWithin(i - 1));
+            if (condition) {
+                return playerPredicate == null || playerPredicate.test(entityplayer); // Only test the player AFTER it is true
+            } else {
+                return false;
+            }
+            // Paper ned
         });
 
         list.forEach((entityplayer) -> {
diff --git a/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java b/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java
index 1dfdb378a2491b0ae64a4152e4cd8b539dfdf65b..efc1d49c5bfea7d1674b8a9de2c8b617657eda0f 100644
--- a/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java
+++ b/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java
@@ -70,7 +70,7 @@ public class ElderGuardian extends Guardian {
         super.customServerAiStep();
         if ((this.tickCount + this.getId()) % 1200 == 0) {
             MobEffectInstance mobeffect = new MobEffectInstance(MobEffects.DIG_SLOWDOWN, 6000, 2);
-            List<ServerPlayer> list = MobEffectUtil.addEffectToPlayersAround((ServerLevel) this.level(), this, this.position(), 50.0D, mobeffect, 1200, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK); // CraftBukkit
+            List<ServerPlayer> list = MobEffectUtil.addEffectToPlayersAround((ServerLevel) this.level(), this, this.position(), 50.0D, mobeffect, 1200, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK, (player) -> new io.papermc.paper.event.entity.ElderGuardianAppearanceEvent(getBukkitEntity(), player.getBukkitEntity()).callEvent()); // CraftBukkit // Paper
 
             list.forEach((entityplayer) -> {
                 entityplayer.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.GUARDIAN_ELDER_EFFECT, this.isSilent() ? 0.0F : 1.0F));