Make Furious Zombies spawn naturally

src/main/java/mod/icarus/crimsonrevelations/NewCrimsonRevelations.java

@@ -4,6 +4,7 @@
 import mod.icarus.crimsonrevelations.events.CRClientEvents;
 import mod.icarus.crimsonrevelations.events.CREvents;
 import mod.icarus.crimsonrevelations.init.CRCreativeTabs;
+import mod.icarus.crimsonrevelations.init.CREntities;
 import mod.icarus.crimsonrevelations.init.CRRecipes;
 import mod.icarus.crimsonrevelations.init.CRRenderRegistry;
 import mod.icarus.crimsonrevelations.init.CRResearchRegistry;
@@ -54,6 +55,7 @@ public void init(FMLInitializationEvent event) {
 
     @EventHandler
     public void postinit(FMLPostInitializationEvent event) {
+        CREntities.registerEntitySpawns();
         CRCompatHandler.postInit();
     }
 }

src/main/java/mod/icarus/crimsonrevelations/config/CRConfig.java

@@ -19,6 +19,22 @@ public class CRConfig {
     public static TAIntegrationSettings thaumic_augmentation_settings = new TAIntegrationSettings();
 
     public static class GeneralSettings {
+        @Config.Name("Furious Zombie: Spawning")
+        @Config.Comment("Enables Furious Zombies to spawn naturally. [default: true]")
+        @Config.RequiresMcRestart
+        public boolean FURIOUS_ZOMBIE_SPAWNING = true;
+
+        @Config.Name("Furious Zombie: Underground Spawning")
+        @Config.Comment("Enables Furious Zombies to spawn naturally underground. [default: false]")
+        @Config.RequiresMcRestart
+        public boolean FURIOUS_ZOMBIE_UNDERGROUND_SPAWNING = false;
+
+        @Config.Name("Furious Zombie: Spawn Weight")
+        @Config.Comment("Default spawn weight of Furious Zombies. [default: 5]")
+        @Config.RangeInt(min = 0, max = 99999)
+        @Config.RequiresMcRestart
+        public int FURIOUS_ZOMBIE_WEIGHT = 5;
+
         @Config.Name("Primordial Scribing Tools: Curiosity Chance")
         @Config.Comment("The chance for a curiosity to be obtained from the Primordial Scribing Tools. [default: 0.3]")
         @Config.RangeDouble(min = 0.0D, max = 1.0D)

src/main/java/mod/icarus/crimsonrevelations/init/CREntities.java

@@ -4,8 +4,11 @@
 import mod.icarus.crimsonrevelations.config.CRConfig;
 import mod.icarus.crimsonrevelations.entity.boss.EntityOvergrownTaintacle;
 import mod.icarus.crimsonrevelations.entity.projectile.EntityPrimalArrow;
+
 import net.minecraft.entity.Entity;
+import net.minecraft.entity.EnumCreatureType;
 import net.minecraft.util.ResourceLocation;
+
 import net.minecraftforge.event.RegistryEvent;
 import net.minecraftforge.fml.common.Loader;
 import net.minecraftforge.fml.common.Mod.EventBusSubscriber;
@@ -14,6 +17,9 @@
 import net.minecraftforge.fml.common.registry.EntityRegistry;
 import net.minecraftforge.fml.common.registry.GameRegistry;
 
+import thaumcraft.common.entities.monster.EntityBrainyZombie;
+import thaumcraft.common.entities.monster.EntityGiantBrainyZombie;
+
 @EventBusSubscriber(modid = NewCrimsonRevelations.MODID)
 @GameRegistry.ObjectHolder(NewCrimsonRevelations.MODID)
 public class CREntities {
@@ -24,8 +30,15 @@ public static void registerEntities(RegistryEvent.Register<EntityEntry> event) {
         //registerEntity("cultist_archer", EntityCultistArcher.class, id++, 64, 3, true, 0x1C1A2F, 0x5649B4);
         registerEntity("primal_arrow", EntityPrimalArrow.class, id++, 64, 1, true);
 
-        if (Loader.isModLoaded("thaumicaugmentation") && CRConfig.mod_integration_settings.TA_INTEGRATION)
+        if (Loader.isModLoaded("thaumicaugmentation") && CRConfig.mod_integration_settings.TA_INTEGRATION) {
             registerEntity("overgrown_taintacle", EntityOvergrownTaintacle.class, id++, 64, 3, true, 0x1C1A2F, 0x5649B4);
+        }
+    }
+
+    public static void registerEntitySpawns() {
+        if (CRConfig.general_settings.FURIOUS_ZOMBIE_SPAWNING) {
+            EntityRegistry.addSpawn(EntityGiantBrainyZombie.class, CRConfig.general_settings.FURIOUS_ZOMBIE_WEIGHT, 1, 1, EnumCreatureType.MONSTER, CRRegistry.getEntityBiomes(EntityBrainyZombie.class));
+        }
     }
 
     public static void registerEntity(String name, Class<? extends Entity> clazz, int id, int trackingRange, int updateFrequency, boolean sendVelocityUpdates, int eggColor1, int eggColor2) {

src/main/java/mod/icarus/crimsonrevelations/init/CRRegistry.java

@@ -1,12 +1,18 @@
 package mod.icarus.crimsonrevelations.init;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import javax.annotation.Nonnull;
 
 import com.google.common.base.Preconditions;
 
 import net.minecraft.block.Block;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EnumCreatureType;
 import net.minecraft.item.Item;
 import net.minecraft.util.ResourceLocation;
+import net.minecraft.world.biome.Biome;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.registries.IForgeRegistryEntry;
 
@@ -32,4 +38,21 @@ public static <T extends IForgeRegistryEntry> T setup(@Nonnull final T entry, @N
             ((Item) entry).setTranslationKey(registryName.getNamespace() + "." + registryName.getPath()).setCreativeTab(NewCrimsonRevelations.tabCR);
         return entry;
     }
+
+    // Gets biomes from selected entity.
+    public static Biome[] getEntityBiomes(Class<? extends Entity> spawn) {
+        List<Biome> biomes = new ArrayList<>();
+
+        for (Biome biome : Biome.REGISTRY) {
+            List<Biome.SpawnListEntry> spawnList = biome.getSpawnableList(EnumCreatureType.MONSTER);
+
+            for (Biome.SpawnListEntry list : spawnList)
+                if (list.entityClass == spawn) {
+                    biomes.add(biome);
+                    break;
+                }
+        }
+
+        return biomes.toArray(new Biome[0]);
+    }
 }

src/main/java/mod/icarus/crimsonrevelations/mixin/entity/EntityGiantBrainyZombieMixin.java

@@ -0,0 +1,24 @@
+package mod.icarus.crimsonrevelations.mixin.entity;
+
+import mod.icarus.crimsonrevelations.config.CRConfig;
+import net.minecraft.entity.monster.EntityMob;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import org.spongepowered.asm.mixin.Mixin;
+import thaumcraft.common.entities.monster.EntityGiantBrainyZombie;
+
+@Mixin(value = EntityGiantBrainyZombie.class, remap = false)
+public class EntityGiantBrainyZombieMixin extends EntityMob {
+    public EntityGiantBrainyZombieMixin(World world) {
+        super(world);
+    }
+
+    @Override
+    public boolean getCanSpawnHere() {
+        if (!CRConfig.general_settings.FURIOUS_ZOMBIE_UNDERGROUND_SPAWNING) {
+            return super.getCanSpawnHere() && this.world.canSeeSky(new BlockPos(this));
+        } else {
+            return super.getCanSpawnHere();
+        }
+    }
+}

src/main/resources/mixins.crimsonrevelations.entities.json

@@ -6,7 +6,8 @@
   "mixins": [
     "EntityCultistClericMixin",
     "EntityCultistKnightMixin",
-    "EntityCultistPortalLesserMixin"
+    "EntityCultistPortalLesserMixin",
+    "EntityGiantBrainyZombieMixin"
   ],
   "client": [],
   "server": []