add config refactor structure

src/entities/Fish.h

@@ -0,0 +1,34 @@
+#pragma once
+#include "../assets/FishAssets.h"
+#include "Entity.h"
+#include <array>
+#include <unordered_map>
+
+class Fish : public Entity {
+private:
+  static constexpr std::array<char, 12> AVAILABLE_COLORS = {
+      'c', 'C', 'r', 'R', 'y', 'Y', 'b', 'B', 'g', 'G', 'm', 'M'};
+
+  const std::vector<std::string> &image;
+  std::vector<std::string> mask;
+  const float speed;
+
+  static std::unordered_map<char, char> color_map;
+
+  explicit Fish(int asset_index);
+  static int getRandomAssetIndex();
+  void randomizeMask();
+
+public:
+  Fish();
+
+  void update() noexcept override;
+  const std::vector<std::string> &getImage() const override { return image; }
+  const std::vector<std::string> &getMask() const override { return mask; }
+  char getDefaultColor() const noexcept override { return 'k'; }
+
+  std::unique_ptr<Entity> createReplacement() const override;
+  int getPreferredLayer() const noexcept override;
+
+  bool shouldSpawnBubble() const;
+};