From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Sat, 22 Aug 2020 20:47:11 -0700
Subject: [PATCH] Allow toggling special MobSpawners per world

In vanilla, these are all hardcoded on for world type 0 (overworld) and hardcoded off for every other world type. Default config behaviour matches this.

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 11f92c1011a1accaf485e5785d2e9ebc8440406c..af57326c8d461d3c5d84f582d5bc6345c3c9367b 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -663,7 +663,24 @@ public class ServerLevel extends Level implements WorldGenLevel {
         this.dragonParts = new Int2ObjectOpenHashMap();
         this.tickTime = flag1;
         this.server = minecraftserver;
-        this.customSpawners = list;
+        // Purpur start - enable/disable MobSpawners per world
+        this.customSpawners = Lists.newArrayList();
+        if (purpurConfig.phantomSpawning) {
+            customSpawners.add(new net.minecraft.world.level.levelgen.PhantomSpawner());
+        }
+        if (purpurConfig.patrolSpawning) {
+            customSpawners.add(new net.minecraft.world.level.levelgen.PatrolSpawner());
+        }
+        if (purpurConfig.catSpawning) {
+            customSpawners.add(new net.minecraft.world.entity.npc.CatSpawner());
+        }
+        if (purpurConfig.villageSiegeSpawning) {
+            customSpawners.add(new net.minecraft.world.entity.ai.village.VillageSiege());
+        }
+        if (purpurConfig.villagerTraderSpawning) {
+            customSpawners.add(new net.minecraft.world.entity.npc.WanderingTraderSpawner(iworlddataserver));
+        }
+        // Purpur end
         this.serverLevelData = iworlddataserver;
         ChunkGenerator chunkgenerator = worlddimension.generator();
         // CraftBukkit start
diff --git a/src/main/java/net/minecraft/world/entity/npc/WanderingTraderSpawner.java b/src/main/java/net/minecraft/world/entity/npc/WanderingTraderSpawner.java
index 8385eb1d60f377da94e3178ab506feefb43563fd..a5443f92786427c42092aec8350e7ab37704db7a 100644
--- a/src/main/java/net/minecraft/world/entity/npc/WanderingTraderSpawner.java
+++ b/src/main/java/net/minecraft/world/entity/npc/WanderingTraderSpawner.java
@@ -159,7 +159,17 @@ public class WanderingTraderSpawner implements CustomSpawner {
             int k = pos.getX() + this.random.nextInt(range * 2) - range;
             int l = pos.getZ() + this.random.nextInt(range * 2) - range;
             int i1 = world.getHeight(Heightmap.Types.WORLD_SURFACE, k, l);
-            BlockPos blockposition2 = new BlockPos(k, i1, l);
+            // Purpur start - allow traders to spawn below nether roof
+            BlockPos.MutableBlockPos blockposition2 = new BlockPos.MutableBlockPos(k, i1, l);
+            if (world.dimensionType().hasCeiling()) {
+                do {
+                    blockposition2.relative(net.minecraft.core.Direction.DOWN);
+                } while (!world.getBlockState(blockposition2).isAir());
+                do {
+                    blockposition2.relative(net.minecraft.core.Direction.DOWN);
+                } while (world.getBlockState(blockposition2).isAir() && blockposition2.getY() > 0);
+            }
+            // Purpur end
 
             if (NaturalSpawner.isSpawnPositionOk(SpawnPlacements.Type.ON_GROUND, world, blockposition2, EntityType.WANDERING_TRADER)) {
                 blockposition1 = blockposition2;
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 32b2444c0e96d4ba53693764a4caf0b596ed947f..e0447c62f0c5df368a3ea41d63f64e23ccb06271 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -69,6 +69,12 @@ public class PurpurWorldConfig {
         return PurpurConfig.config.getBoolean("world-settings." + worldName + "." + path, PurpurConfig.config.getBoolean("world-settings.default." + path));
     }
 
+    private boolean getBoolean(String path, Predicate<Boolean> predicate) {
+        String val = getString(path, "default").toLowerCase();
+        Boolean bool = BooleanUtils.toBooleanObject(val, "true", "false", "default");
+        return predicate.test(bool);
+    }
+
     private double getDouble(String path, double def) {
         PurpurConfig.config.addDefault("world-settings.default." + path, def);
         return PurpurConfig.config.getDouble("world-settings." + worldName + "." + path, PurpurConfig.config.getDouble("world-settings.default." + path));
@@ -237,6 +243,21 @@ public class PurpurWorldConfig {
         }
     }
 
+    public boolean catSpawning;
+    public boolean patrolSpawning;
+    public boolean phantomSpawning;
+    public boolean villagerTraderSpawning;
+    public boolean villageSiegeSpawning;
+    private void mobSpawnerSettings() {
+        // values of "default" or null will default to true only if the world environment is normal (aka overworld)
+        Predicate<Boolean> predicate = (bool) -> (bool != null && bool) || (bool == null && environment == World.Environment.NORMAL);
+        catSpawning = getBoolean("gameplay-mechanics.mob-spawning.village-cats", predicate);
+        patrolSpawning = getBoolean("gameplay-mechanics.mob-spawning.raid-patrols", predicate);
+        phantomSpawning = getBoolean("gameplay-mechanics.mob-spawning.phantoms", predicate);
+        villagerTraderSpawning = getBoolean("gameplay-mechanics.mob-spawning.wandering-traders", predicate);
+        villageSiegeSpawning = getBoolean("gameplay-mechanics.mob-spawning.village-sieges", predicate);
+    }
+
     public boolean idleTimeoutKick = true;
     public boolean idleTimeoutTickNearbyEntities = true;
     public boolean idleTimeoutCountAsSleeping = false;