From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sun, 7 Jul 2019 19:52:16 -0500
Subject: [PATCH] Zombie horse naturally spawn


diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index d3624f5a4e3ab9f09d1588a648acba6920e95cfc..f9df95b189318f08c42bb120c4fa815fc47683ac 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -777,9 +777,15 @@ public class ServerLevel extends Level implements WorldGenLevel {
                 boolean flag1 = this.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && this.random.nextDouble() < (double) difficultydamagescaler.getEffectiveDifficulty() * this.paperConfig().entities.spawning.skeletonHorseThunderSpawnChance.or(0.01D) && !this.getBlockState(blockposition.below()).is(Blocks.LIGHTNING_ROD); // Paper
 
                 if (flag1) {
-                    SkeletonHorse entityhorseskeleton = (SkeletonHorse) EntityType.SKELETON_HORSE.create(this);
-
-                    entityhorseskeleton.setTrap(true);
+                    // Purpur start
+                    net.minecraft.world.entity.animal.horse.AbstractHorse entityhorseskeleton = EntityType.SKELETON_HORSE.create(this);
+                    if (purpurConfig.zombieHorseSpawnChance > 0D && random.nextDouble() <= purpurConfig.zombieHorseSpawnChance) {
+                        entityhorseskeleton = EntityType.ZOMBIE_HORSE.create(this);
+                    } else {
+                        entityhorseskeleton = EntityType.SKELETON_HORSE.create(this);
+                        ((SkeletonHorse) entityhorseskeleton).setTrap(true);
+                    }
+                    // Purpur end
                     entityhorseskeleton.setAge(0);
                     entityhorseskeleton.setPos((double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ());
                     this.addFreshEntity(entityhorseskeleton, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.LIGHTNING); // CraftBukkit
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 336b214230600b8b1d223c65470820e388f676d9..6a5507be0f9a78855225437676865e15f06bcd9a 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -1416,6 +1416,7 @@ public class PurpurWorldConfig {
     public double zombieHorseJumpStrengthMax = 1.0D;
     public double zombieHorseMovementSpeedMin = 0.2D;
     public double zombieHorseMovementSpeedMax = 0.2D;
+    public double zombieHorseSpawnChance = 0.0D;
     private void zombieHorseSettings() {
         zombieHorseRidableInWater = getBoolean("mobs.zombie_horse.ridable-in-water", zombieHorseRidableInWater);
         zombieHorseCanSwim = getBoolean("mobs.zombie_horse.can-swim", zombieHorseCanSwim);
@@ -1431,6 +1432,7 @@ public class PurpurWorldConfig {
         zombieHorseJumpStrengthMax = getDouble("mobs.zombie_horse.attributes.jump_strength.max", zombieHorseJumpStrengthMax);
         zombieHorseMovementSpeedMin = getDouble("mobs.zombie_horse.attributes.movement_speed.min", zombieHorseMovementSpeedMin);
         zombieHorseMovementSpeedMax = getDouble("mobs.zombie_horse.attributes.movement_speed.max", zombieHorseMovementSpeedMax);
+        zombieHorseSpawnChance = getDouble("mobs.zombie_horse.spawn-chance", zombieHorseSpawnChance);
     }
 
     public boolean zombieVillagerRidable = false;