Interfaces fix

core/src/main/java/mc/core/Location.java

@@ -20,6 +20,10 @@ public class Location {
         );
     }
 
+    public static Location startPointLocation () {
+        return new Location(0,10,0);
+    }
+
     public void set(Location location) {
         this.x = location.x;
         this.y = location.y;

core/src/main/java/mc/core/world/ChunkLoader.java

@@ -0,0 +1,27 @@
+package mc.core.world;
+
+import java.util.Optional;
+
+public interface ChunkLoader {
+
+    /**
+     * Loads chunk from cache. If chunk in cache doesn't exist, loads from file (or other storage)
+     *
+     * @param x chunk position
+     * @param y chunk position
+     * @param z chunk position
+     * @return optional of chunk (nullable)
+     */
+    Optional<Chunk> loadChunk (int x, int y, int z);
+
+    /**
+     *  Tries to load chunk like {@link #loadChunk(int, int, int)}
+     *  If chunk doesn't exist, generates it with selected world generator
+     *
+     * @param x chunk position
+     * @param y chunk position
+     * @param z chunk position
+     * @return chunk
+     */
+    Chunk loadOrGenerateChunk (int x, int y, int z);
+}

core/src/main/java/mc/core/world/World.java

@@ -6,10 +6,14 @@ package mc.core.world;
 
 import mc.core.Location;
 
+import java.util.UUID;
+
 public interface World {
+    UUID getWorldId();
+
     Location getSpawn();
     void setSpawn(Location location);
 
-    Chunk getChunk(int x, int z);
-    void setChunk(int x, int z, Chunk chunk);
+    Chunk getChunk(int x, int y, int z);
+    void setChunk(int x, int y, int z, Chunk chunk);
 }

core/src/main/java/mc/core/world/WorldGenerator.java

@@ -0,0 +1,6 @@
+package mc.core.world;
+
+public interface WorldGenerator {
+
+    Chunk generateChunk (int x, int z, World world);
+}