feat(flesh-mound): prevent natural spawning of mobs inside flesh mounds

src/main/java/com/github/elenterius/biomancy/event/MobSpawnHandler.java

@@ -0,0 +1,49 @@
+package com.github.elenterius.biomancy.event;
+
+import com.github.elenterius.biomancy.BiomancyMod;
+import com.github.elenterius.biomancy.world.RegionManager;
+import com.github.elenterius.biomancy.world.mound.MoundShape;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.MobSpawnType;
+import net.minecraftforge.event.entity.living.LivingSpawnEvent;
+import net.minecraftforge.eventbus.api.Event;
+import net.minecraftforge.eventbus.api.EventPriority;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+
+import java.util.Set;
+
+@Mod.EventBusSubscriber(modid = BiomancyMod.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE)
+public final class MobSpawnHandler {
+
+	private static final Set<MobSpawnType> NATURAL_SPAWN_TYPE = Set.of(
+			MobSpawnType.EVENT,
+			MobSpawnType.NATURAL,
+			MobSpawnType.CHUNK_GENERATION,
+			MobSpawnType.PATROL
+	);
+
+	private MobSpawnHandler() {}
+
+	@SubscribeEvent(priority = EventPriority.HIGH)
+	public static void onCheckSpawn(LivingSpawnEvent.CheckSpawn event) {
+		if (event.isCanceled()) return;
+
+		boolean isNaturalSpawn = NATURAL_SPAWN_TYPE.contains(event.getSpawnReason());
+
+		if (isNaturalSpawn && event.getLevel() instanceof ServerLevel serverLevel) {
+			BlockPos pos = new BlockPos(event.getX(), event.getY(), event.getZ());
+			//Mob entity = event.getEntity();
+
+			//TODO: implement check with BoundingBox of entity
+			if (RegionManager.getClosestShape(serverLevel, pos) instanceof MoundShape) {
+				//TODO: chamber level mob spawn prevention? --> e.g. spawning chamber for creepers
+				//MoundChamber chamber = moundShape.getChamberAt(pos.getX(), pos.getY(), pos.getZ());
+
+				event.setResult(Event.Result.DENY);
+			}
+		}
+	}
+
+}