From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Encode42 <me@encode42.dev>
Date: Tue, 11 May 2021 21:00:53 -0400
Subject: [PATCH] Configurable mob blindness

Ported from https://github.com/raltsmc/mobblindness

diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index b036b0145a83eeb424beb261483b0515518dacd5..2c5d453f57b28008e5b98cf6aec044cb3ffb2385 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -987,6 +987,17 @@ public abstract class LivingEntity extends Entity {
             if (entitytypes == EntityType.SKELETON && itemstack.is(Items.SKELETON_SKULL) || entitytypes == EntityType.ZOMBIE && itemstack.is(Items.ZOMBIE_HEAD) || entitytypes == EntityType.CREEPER && itemstack.is(Items.CREEPER_HEAD)) {
                 d0 *= 0.5D;
             }
+
+            // Purpur start
+            if (entity instanceof LivingEntity entityliving) {
+                if (entityliving.hasEffect(MobEffects.BLINDNESS)) {
+                    int amplifier = entityliving.getEffect(MobEffects.BLINDNESS).getAmplifier();
+                    for (int i = 0; i < amplifier; i++) {
+                        d0 *= this.level.purpurConfig.mobsBlindnessMultiplier;
+                    }
+                }
+            }
+            // Purpur end
         }
 
         return d0;
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index b0464be1ddd80616f002471a0b2b64602bd3e6f1..e0e50d90c2d801688810f8ef122ee1c4e905a39b 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -459,6 +459,7 @@ public class PurpurWorldConfig {
     public boolean persistentDroppableEntityDisplayNames = false;
     public boolean projectilesBypassMobGriefing = false;
     public boolean tickFluids = true;
+    public double mobsBlindnessMultiplier = 1;
     public double tridentLoyaltyVoidReturnHeight = 0.0D;
     public double voidDamageHeight = -64.0D;
     public double voidDamageDealt = 4.0D;
@@ -479,6 +480,7 @@ public class PurpurWorldConfig {
         persistentDroppableEntityDisplayNames = getBoolean("gameplay-mechanics.persistent-droppable-entity-display-names", persistentDroppableEntityDisplayNames);
         projectilesBypassMobGriefing = getBoolean("gameplay-mechanics.projectiles-bypass-mob-griefing", projectilesBypassMobGriefing);
         tickFluids = getBoolean("gameplay-mechanics.tick-fluids", tickFluids);
+        mobsBlindnessMultiplier = getDouble("gameplay-mechanics.entity-blindness-multiplier", mobsBlindnessMultiplier);
         tridentLoyaltyVoidReturnHeight = getDouble("gameplay-mechanics.trident-loyalty-void-return-height", tridentLoyaltyVoidReturnHeight);
         voidDamageHeight = getDouble("gameplay-mechanics.void-damage-height", voidDamageHeight);
         voidDamageDealt = getDouble("gameplay-mechanics.void-damage-dealt", voidDamageDealt);