refactor state management and input handling into separate classes

include/input.hpp

@@ -0,0 +1,43 @@
+#ifndef __INPUT_HPP_
+#define __INPUT_HPP_
+
+#include "renderer.hpp"
+#include "state.hpp"
+
+class InputHandler {
+public:
+  StateManager &state;
+  Renderer &renderer;
+
+  int hov_x;
+  int hov_y;
+  int sel_x;
+  int sel_y;
+
+  bool has_block_add_xy = false;
+  int block_add_x = -1;
+  int block_add_y = -1;
+
+public:
+  InputHandler(StateManager &state, Renderer &renderer)
+      : state(state), renderer(renderer), hov_x(-1), hov_y(-1), sel_x(-1),
+        sel_y(-1), has_block_add_xy(false), block_add_x(-1), block_add_y(-1) {}
+
+  InputHandler(const InputHandler &copy) = delete;
+  InputHandler &operator=(const InputHandler &copy) = delete;
+  InputHandler(InputHandler &&move) = delete;
+  InputHandler &operator=(InputHandler &&move) = delete;
+
+  ~InputHandler() {}
+
+public:
+  auto HandleMouseHover() -> void;
+
+  auto HandleMouse() -> void;
+
+  auto HandleKeys() -> void;
+
+  auto HandleInput() -> void;
+};
+
+#endif