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 f8026eb1d9b10e468d28ee2e1296653e873c87db..23977c2074b920b646a639bef79c0f625b284bea 100644
--- a/src/main/java/net/minecraft/world/effect/MobEffectUtil.java
+++ b/src/main/java/net/minecraft/world/effect/MobEffectUtil.java
@@ -55,10 +55,23 @@ 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 - Add ElderGuardianAppearanceEvent
+        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 - Add ElderGuardianAppearanceEvent
         // CraftBukkit end
         Holder<MobEffect> holder = 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(holder) || entityplayer.getEffect(holder).getAmplifier() < mobeffect.getAmplifier() || entityplayer.getEffect(holder).endsWithin(i - 1));
+            // Paper start - Add ElderGuardianAppearanceEvent
+            boolean condition = entityplayer.gameMode.isSurvival() && (entity == null || !entity.isAlliedTo((Entity) entityplayer)) && vec3d.closerThan(entityplayer.position(), d0) && (!entityplayer.hasEffect(holder) || entityplayer.getEffect(holder).getAmplifier() < mobeffect.getAmplifier() || entityplayer.getEffect(holder).endsWithin(i - 1));
+            if (condition) {
+                return playerPredicate == null || playerPredicate.test(entityplayer); // Only test the player AFTER it is true
+            } else {
+                return false;
+            }
+            // Paper ned - Add ElderGuardianAppearanceEvent
         });
 
         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 4e4b68904151d0d851b13f14f89c1c305e95fd5a..fd995b1f29c47884e9db2cb92f1dd615d62ae032 100644
--- a/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java
+++ b/src/main/java/net/minecraft/world/entity/monster/ElderGuardian.java
@@ -67,7 +67,7 @@ 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((org.bukkit.entity.ElderGuardian) this.getBukkitEntity(), player.getBukkitEntity()).callEvent()); // CraftBukkit // Paper - Add ElderGuardianAppearanceEvent
 
             list.forEach((entityplayer) -> {
                 entityplayer.connection.send(new ClientboundGameEventPacket(ClientboundGameEventPacket.GUARDIAN_ELDER_EFFECT, this.isSilent() ? 0.0F : 1.0F));
