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 42d5b4ffc51da90a8f3bbec84e44ac2b0cb7b5ee..ac9f7e786d2e2042b8694a4ddd2f806758f9ea50 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -873,10 +873,18 @@ 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);
+                    // Purpur start
+                    net.minecraft.world.entity.animal.horse.AbstractHorse entityhorseskeleton;
+                    if (purpurConfig.zombieHorseSpawnChance > 0D && random.nextDouble() <= purpurConfig.zombieHorseSpawnChance) {
+                        entityhorseskeleton = EntityType.ZOMBIE_HORSE.create(this);
+                    } else {
+                        entityhorseskeleton = EntityType.SKELETON_HORSE.create(this);
+                        if (entityhorseskeleton != null) ((SkeletonHorse) entityhorseskeleton).setTrap(true);
+                    }
+                    // Purpur end
 
                     if (entityhorseskeleton != null) {
-                        entityhorseskeleton.setTrap(true);
+                        //entityhorseskeleton.setTrap(true); // Purpur - moved up
                         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 71333fd7ea1cde870bb1d76959d1b599d8c6376d..9e0017fb69ea24c866fe78f0dc7cc90cfdb17517 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -1021,6 +1021,7 @@ 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() {
         if (PurpurConfig.version < 10) {
             double oldValue = getDouble("mobs.zombie_horse.attributes.max-health", zombieHorseMaxHealthMin);
@@ -1034,6 +1035,7 @@ 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 double zombieVillagerMaxHealth = 20.0D;