2 files changed, 86 insertions, 2 deletions
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
index 6a212eb..7097ee1 100644
--- a/src/crepe/api/LoopManager.h
+++ b/src/crepe/api/LoopManager.h
@@ -61,7 +61,7 @@ private:
 	 *
 	 * Updates the game state based on the elapsed time since the last frame.
 	 */
-	void update();
+	virtual void update();
 
 	/**
 	 * \brief Late update which is called after update().
@@ -75,7 +75,7 @@ private:
 	 *
 	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
 	 */
-	void fixed_update();
+	virtual void fixed_update();
 	/**
 	 * \brief Function for executing render-related systems.
 	 *
diff --git a/src/crepe/system/InputSystem.h b/src/crepe/system/InputSystem.h
new file mode 100644
index 0000000..0c42bd6
--- /dev/null
+++ b/src/crepe/system/InputSystem.h
@@ -0,0 +1,84 @@
+#pragma once
+
+#include "../facade/SDLContext.h"
+#include "../types.h"
+#include "../util/OptionalRef.h"
+
+#include "System.h"
+
+namespace crepe {
+
+class Camera;
+class Button;
+class Transform;
+
+/**
+ * \brief Handles the processing of input events created by SDLContext
+ *
+ * This system processes events such as mouse clicks, mouse movement, and keyboard
+ * actions. It is responsible for detecting interactions with UI buttons and
+ * passing the corresponding events to the registered listeners.
+ */
+class InputSystem : public System {
+public:
+	using System::System;
+
+	/**
+     * \brief Updates the system, processing all input events.
+     * This method processes all events and triggers corresponding actions.
+     */
+	void update() override;
+
+private:
+	//! Stores the last position of the mouse when the button was pressed.
+	ivec2 last_mouse_down_position;
+
+	//! Stores the last mouse button pressed.
+	MouseButton last_mouse_button = MouseButton::NONE;
+
+	//! The maximum allowable distance between mouse down and mouse up to register as a click.
+	const int click_tolerance = 5;
+
+	/**
+	* \brief Handles the mouse click event.
+	* \param mouse_button The mouse button involved in the click.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	*
+	* This method processes the mouse click event and triggers the corresponding button action.
+	*/
+	void handle_click(const MouseButton & mouse_button, const int world_mouse_x,
+					  const int world_mouse_y);
+
+	/**
+	* \brief Handles the mouse movement event.
+	* \param event_data The event data containing information about the mouse movement.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	*
+	* This method processes the mouse movement event and updates the button hover state.
+	*/
+	void handle_move(const SDLContext::EventData & event_data, const int world_mouse_x,
+					 const int world_mouse_y);
+
+	/**
+	* \brief Checks if the mouse position is inside the bounds of the button.
+	* \param world_mouse_x The X coordinate of the mouse in world space.
+	* \param world_mouse_y The Y coordinate of the mouse in world space.
+	* \param button The button to check.
+	* \param transform The transform component of the button.
+	* \return True if the mouse is inside the button, false otherwise.
+	*/
+	bool is_mouse_inside_button(const int world_mouse_x, const int world_mouse_y,
+								const Button & button, const Transform & transform);
+
+	/**
+	* \brief Handles the button press event, calling the on_click callback if necessary.
+	* \param button The button being pressed.
+	*
+	* This method triggers the on_click action for the button when it is pressed.
+	*/
+	void handle_button_press(Button & button);
+};
+
+} // namespace crepe