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/net/minecraft/world/entity/LivingEntity.java b/net/minecraft/world/entity/LivingEntity.java
index dc0656378d81a77e1d49895a90f92f27e3e247f3..28d3b200ab0c3e8993dfb89a3e48146898c6b85e 100644
--- a/net/minecraft/world/entity/LivingEntity.java
+++ b/net/minecraft/world/entity/LivingEntity.java
@@ -1065,6 +1065,17 @@ public abstract class LivingEntity extends Entity implements Attackable {
             if (entitytypes == EntityType.SKELETON && itemstack.is(Items.SKELETON_SKULL) || entitytypes == EntityType.ZOMBIE && itemstack.is(Items.ZOMBIE_HEAD) || entitytypes == EntityType.PIGLIN && itemstack.is(Items.PIGLIN_HEAD) || entitytypes == EntityType.PIGLIN_BRUTE && itemstack.is(Items.PIGLIN_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 19e77eadb5ece2da43eb82f7b7d196e1616348af..1ae95a30b6e4cf69028dc61c398651bde526418f 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -138,6 +138,7 @@ public class PurpurWorldConfig {
     public boolean imposeTeleportRestrictionsOnNetherPortals = false;
     public boolean imposeTeleportRestrictionsOnEndPortals = false;
     public boolean tickFluids = true;
+    public double mobsBlindnessMultiplier = 1;
     private void miscGameplayMechanicsSettings() {
         useBetterMending = getBoolean("gameplay-mechanics.use-better-mending", useBetterMending);
         alwaysTameInCreative = getBoolean("gameplay-mechanics.always-tame-in-creative", alwaysTameInCreative);
@@ -158,6 +159,7 @@ public class PurpurWorldConfig {
         imposeTeleportRestrictionsOnNetherPortals = getBoolean("gameplay-mechanics.impose-teleport-restrictions-on-nether-portals", imposeTeleportRestrictionsOnNetherPortals);
         imposeTeleportRestrictionsOnEndPortals = getBoolean("gameplay-mechanics.impose-teleport-restrictions-on-end-portals", imposeTeleportRestrictionsOnEndPortals);
         tickFluids = getBoolean("gameplay-mechanics.tick-fluids", tickFluids);
+        mobsBlindnessMultiplier = getDouble("gameplay-mechanics.entity-blindness-multiplier", mobsBlindnessMultiplier);
     }
 
     public int daytimeTicks = 12000;