13 files changed, 1132 insertions, 0 deletions

diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 85696c4..edf4250 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -18,8 +18,12 @@ target_sources(crepe PUBLIC
 	Vector2.cpp
 	Camera.cpp
 	Animator.cpp
+	EventManager.cpp
+	IKeyListener.cpp
+	IMouseListener.cpp
 	LoopManager.cpp
 	LoopTimer.cpp
+	EventHandler.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -44,6 +48,13 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	SceneManager.hpp
 	Camera.h
 	Animator.h
+	EventManager.h
+	EventManager.hpp
+	EventHandler.h
+	EventHandler.hpp
+	Event.h
+	IKeyListener.h
+	IMouseListener.h
 	LoopManager.h
 	LoopTimer.h
 )
diff --git a/src/crepe/api/Event.h b/src/crepe/api/Event.h
new file mode 100644
index 0000000..d5ddf0a
--- /dev/null
+++ b/src/crepe/api/Event.h
@@ -0,0 +1,115 @@
+#pragma once
+
+#include <string>
+
+#include "KeyCodes.h"
+
+/**
+ * \brief Base class for all event types in the system.
+ */
+class Event {
+public:
+};
+
+/**
+ * \brief Event triggered when a key is pressed.
+ */
+class KeyPressEvent : public Event {
+public:
+	//! Number of times the key press is repeated (e.g., for long presses).
+	int repeat = 0;
+
+	//! The key that was pressed.
+	Keycode key = Keycode::NONE;
+};
+
+/**
+ * \brief Event triggered when a key is released.
+ */
+class KeyReleaseEvent : public Event {
+public:
+	//! The key that was released.
+	Keycode key = Keycode::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is pressed.
+ */
+class MousePressEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was pressed.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is clicked (press and release).
+ */
+class MouseClickEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was clicked.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when a mouse button is released.
+ */
+class MouseReleaseEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+
+	//! The mouse button that was released.
+	MouseButton button = MouseButton::NONE;
+};
+
+/**
+ * \brief Event triggered when the mouse is moved.
+ */
+class MouseMoveEvent : public Event {
+public:
+	//! X-coordinate of the mouse position at the time of the event.
+	int mouse_x = 0;
+
+	//! Y-coordinate of the mouse position at the time of the event.
+	int mouse_y = 0;
+};
+
+/**
+ * \brief Event triggered during a collision between objects.
+ */
+class CollisionEvent : public Event {
+public:
+	//! Data describing the collision (currently not implemented).
+	// Collision collisionData;
+};
+
+/**
+ * \brief Event triggered when text is submitted, e.g., from a text input.
+ */
+class TextSubmitEvent : public Event {
+public:
+	//! The submitted text.
+	std::string text = "";
+};
+
+/**
+ * \brief Event triggered to indicate the application is shutting down.
+ */
+class ShutDownEvent : public Event {
+public:
+};
diff --git a/src/crepe/api/EventHandler.cpp b/src/crepe/api/EventHandler.cpp
new file mode 100644
index 0000000..186ec9c
--- /dev/null
+++ b/src/crepe/api/EventHandler.cpp
@@ -0,0 +1,6 @@
+#include "EventHandler.h"
+
+using namespace crepe;
+
+// Implementation of IEventHandlerWrapper::exec
+bool IEventHandlerWrapper::exec(const Event & e) { return call(e); }
diff --git a/src/crepe/api/EventHandler.h b/src/crepe/api/EventHandler.h
new file mode 100644
index 0000000..db51d04
--- /dev/null
+++ b/src/crepe/api/EventHandler.h
@@ -0,0 +1,115 @@
+#pragma once
+
+#include <functional>
+#include <string>
+
+#include "Event.h"
+
+namespace crepe {
+/**
+ * \brief A type alias for an event handler function.
+ * 
+ * The EventHandler is a std::function that takes an EventType reference and returns a boolean value 
+ * indicating whether the event is handled.
+ * 
+ * \tparam EventType The type of event this handler will handle.
+ */
+template <typename EventType>
+using EventHandler = std::function<bool(const EventType & e)>;
+
+/**
+ * \class IEventHandlerWrapper
+ * \brief An abstract base class for event handler wrappers.
+ * 
+ * This class provides the interface for handling events. Derived classes must implement the
+ * `call()` method to process events and the `get_type()` method to return the handler's type.
+ */
+class IEventHandlerWrapper {
+public:
+	/**
+     * \brief Virtual destructor for IEventHandlerWrapper.
+     */
+	virtual ~IEventHandlerWrapper() = default;
+
+	/**
+     * \brief Executes the handler with the given event.
+     * 
+     * This method calls the `call()` method of the derived class, passing the event to the handler.
+     * 
+     * \param e The event to be processed.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	bool exec(const Event & e);
+
+	/**
+     * \brief Get the type of the event handler.
+     * 
+     * This method returns the type of the event handler as a string.
+     * 
+     * \return A string representing the handler's type.
+     */
+	virtual std::string get_type() const = 0;
+
+private:
+	/**
+     * \brief The method responsible for handling the event.
+     * 
+     * This method is implemented by derived classes to process the event.
+     * 
+     * \param e The event to be processed.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	virtual bool call(const Event & e) = 0;
+};
+
+/**
+ * \class EventHandlerWrapper
+ * \brief A wrapper for event handler functions.
+ * 
+ * This class wraps an event handler function of a specific event type. It implements the 
+ * `call()` and `get_type()` methods to allow the handler to be executed and its type to be 
+ * queried.
+ * 
+ * \tparam EventType The type of event this handler will handle.
+ */
+template <typename EventType>
+class EventHandlerWrapper : public IEventHandlerWrapper {
+public:
+	/**
+     * \brief Constructs an EventHandlerWrapper with a given handler.
+     * 
+     * The constructor takes an event handler function and stores it in the wrapper.
+     * 
+     * \param handler The event handler function.
+     */
+	explicit EventHandlerWrapper(const EventHandler<EventType> & handler);
+
+private:
+	/**
+     * \brief Calls the stored event handler with the event.
+     * 
+     * This method casts the event to the appropriate type and calls the handler.
+     * 
+     * \param e The event to be handled.
+     * \return A boolean value indicating whether the event is handled.
+     */
+	bool call(const Event & e) override;
+
+	/**
+     * \brief Returns the type of the handler.
+     * 
+     * This method returns a string representing the type of the event handler.
+     * 
+     * \return The handler type as a string.
+     */
+	std::string get_type() const override;
+
+	//! The event handler function.
+	EventHandler<EventType> m_handler;
+	//! The type name of the handler function.
+	const std::string m_handler_type;
+};
+
+} // namespace crepe
+
+#include "EventHandler.hpp"
diff --git a/src/crepe/api/EventHandler.hpp b/src/crepe/api/EventHandler.hpp
new file mode 100644
index 0000000..564d3d7
--- /dev/null
+++ b/src/crepe/api/EventHandler.hpp
@@ -0,0 +1,27 @@
+
+#include <typeindex>
+
+#include "EventHandler.h"
+
+namespace crepe {
+
+// Implementation of EventHandlerWrapper constructor
+template <typename EventType>
+EventHandlerWrapper<EventType>::EventHandlerWrapper(
+	const EventHandler<EventType> & handler)
+	: m_handler(handler),
+	  m_handler_type(m_handler.target_type().name()) {}
+
+// Implementation of EventHandlerWrapper::call
+template <typename EventType>
+bool EventHandlerWrapper<EventType>::call(const Event & e) {
+	return m_handler(static_cast<const EventType &>(e));
+}
+
+// Implementation of EventHandlerWrapper::get_type
+template <typename EventType>
+std::string EventHandlerWrapper<EventType>::get_type() const {
+	return m_handler_type;
+}
+
+} //namespace crepe
diff --git a/src/crepe/api/EventManager.cpp b/src/crepe/api/EventManager.cpp
new file mode 100644
index 0000000..7f47938
--- /dev/null
+++ b/src/crepe/api/EventManager.cpp
@@ -0,0 +1,61 @@
+#include "EventManager.h"
+
+using namespace crepe;
+
+EventManager & EventManager::get_instance() {
+	static EventManager instance;
+	return instance;
+}
+
+void EventManager::dispatch_events() {
+	using HandlersMap = std::unordered_map<
+		int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
+	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
+
+	for (auto event_it = this->events_queue.begin();
+		 event_it != this->events_queue.end();) {
+		std::unique_ptr<Event> & event = std::get<0>(*event_it);
+		int channel = std::get<1>(*event_it);
+		std::type_index event_type = std::get<2>(*event_it);
+
+		bool event_handled = false;
+
+		if (channel) {
+			auto handlers_it = subscribers_by_event_id.find(event_type);
+			if (handlers_it != subscribers_by_event_id.end()) {
+				HandlersMap & handlers_map = handlers_it->second;
+				auto handlers = handlers_map.find(channel);
+				if (handlers != handlers_map.end()) {
+					HandlersVec & callbacks = handlers->second;
+					for (auto handler_it = callbacks.begin();
+						 handler_it != callbacks.end(); ++handler_it) {
+						if ((*handler_it)->exec(*event)) {
+							event_it = events_queue.erase(event_it);
+							event_handled = true;
+							break;
+						}
+					}
+				}
+			}
+		} else {
+			// Handle event for all channels
+			auto handlers_it = this->subscribers.find(event_type);
+			if (handlers_it != this->subscribers.end()) {
+				HandlersVec & handlers = handlers_it->second;
+				for (auto handler_it = handlers.begin();
+					 handler_it != handlers.end(); ++handler_it) {
+					// remove event from queue since and continue when callback returns true
+					if ((*handler_it)->exec(*event)) {
+						event_it = this->events_queue.erase(event_it);
+						event_handled = true;
+						break;
+					}
+				}
+			}
+		}
+
+		if (!event_handled) {
+			++event_it;
+		}
+	}
+}
diff --git a/src/crepe/api/EventManager.h b/src/crepe/api/EventManager.h
new file mode 100644
index 0000000..783db62
--- /dev/null
+++ b/src/crepe/api/EventManager.h
@@ -0,0 +1,112 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <type_traits>
+#include <typeindex>
+#include <unordered_map>
+#include <vector>
+
+#include "Event.h"
+#include "EventHandler.h"
+
+namespace crepe {
+
+/**
+ * \class EventManager
+ * \brief The EventManager class is responsible for managing the subscription, triggering, 
+ * and queueing of events. It handles events and dispatches them to appropriate subscribers.
+ */
+class EventManager {
+public:
+	/**
+     * \brief Get the singleton instance of the EventManager.
+     * 
+     * This method returns the unique instance of the EventManager, creating it on the first call.
+     * 
+     * \return Reference to the EventManager instance.
+     */
+	static EventManager & get_instance();
+
+	/**
+     * \brief Subscribe to an event.
+     * 
+     * This method allows the registration of a callback for a specific event type and channel.
+     * 
+     * \tparam EventType The type of the event to subscribe to.
+     * \param callback The callback function to invoke when the event is triggered.
+     * \param channel The channel number to subscribe to (default is 0).
+     */
+	template <typename EventType>
+	void subscribe(EventHandler<EventType> && callback, int channel = 0);
+
+	/**
+     * \brief Unsubscribe from an event.
+     * 
+     * This method removes a previously registered callback from an event.
+     * 
+     * \tparam EventType The type of the event to unsubscribe from.
+     * \param callback The callback function to remove from the subscription list.
+     * \param channel The event ID to unsubscribe from.
+     */
+	template <typename EventType>
+	void unsubscribe(const EventHandler<EventType> &, int channel);
+
+	/**
+     * \brief Trigger an event.
+     * 
+     * This method invokes the appropriate callback(s) for the specified event.
+     * 
+     * \tparam EventType The type of the event to trigger.
+     * \param event The event data to pass to the callback.
+     * \param channel The channel from which to trigger the event (default is 0).
+     */
+	template <typename EventType>
+	void trigger_event(const EventType & event, int channel);
+
+	/**
+     * \brief Queue an event for later processing.
+     * 
+     * This method adds an event to the event queue, which will be processed in the 
+     * dispatch_events function.
+     * 
+     * \tparam EventType The type of the event to queue.
+     * \param event The event to queue.
+     * \param channel The channel number for the event (default is 0).
+     */
+	template <typename EventType>
+	void queue_event(EventType && event, int channel);
+
+	/**
+     * \brief Dispatch all queued events.
+     * 
+     * This method processes all events in the event queue and triggers the corresponding 
+     * callbacks for each event.
+     */
+	void dispatch_events();
+
+private:
+	/**
+     * \brief Default constructor for the EventManager.
+     * 
+     * This constructor is private to enforce the singleton pattern.
+     */
+	EventManager() = default;
+
+	//! The queue of events to be processed.
+	std::vector<std::tuple<std::unique_ptr<Event>, int, std::type_index>>
+		events_queue;
+	//! Registered event handlers.
+	std::unordered_map<std::type_index,
+					   std::vector<std::unique_ptr<IEventHandlerWrapper>>>
+		subscribers;
+	//! Event handlers indexed by event ID.
+	std::unordered_map<
+		std::type_index,
+		std::unordered_map<int,
+						   std::vector<std::unique_ptr<IEventHandlerWrapper>>>>
+		subscribers_by_event_id;
+};
+
+} // namespace crepe
+#include "EventManager.hpp"
diff --git a/src/crepe/api/EventManager.hpp b/src/crepe/api/EventManager.hpp
new file mode 100644
index 0000000..d901492
--- /dev/null
+++ b/src/crepe/api/EventManager.hpp
@@ -0,0 +1,112 @@
+#include "EventManager.h"
+
+namespace crepe {
+
+template <typename EventType>
+void EventManager::subscribe(EventHandler<EventType> && callback, int channel) {
+	using HandlersMap = std::unordered_map<
+		int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
+	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
+
+	std::type_index event_type = typeid(EventType);
+	std::unique_ptr<EventHandlerWrapper<EventType>> handler
+		= std::make_unique<EventHandlerWrapper<EventType>>(callback);
+
+	if (channel) {
+		HandlersMap & handlers_map = this->subscribers_by_event_id[event_type];
+		auto handlers = handlers_map.find(channel);
+		if (handlers != handlers_map.end()) {
+			handlers->second.emplace_back(std::move(handler));
+		} else {
+			handlers_map[channel].emplace_back(std::move(handler));
+		}
+	} else {
+		HandlersVec & handlers = this->subscribers[event_type];
+		handlers.emplace_back(std::move(handler));
+	}
+}
+
+template <typename EventType>
+void EventManager::queue_event(EventType && event, int channel) {
+	std::type_index event_type = std::type_index(typeid(EventType));
+
+	auto event_ptr
+		= std::make_unique<EventType>(std::forward<EventType>(event));
+
+	std::tuple<std::unique_ptr<Event>, int, std::type_index> tuple(
+		std::move(event_ptr), channel, event_type);
+	this->events_queue.push_back(std::move(tuple));
+}
+
+template <typename EventType>
+void EventManager::trigger_event(const EventType & event, int channel) {
+	using HandlersMap = std::unordered_map<
+		int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
+	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
+
+	std::type_index event_type = std::type_index(typeid(EventType));
+
+	if (channel > 0) {
+		HandlersMap & handlers_map = this->subscribers_by_event_id[event_type];
+		auto handlers_it = handlers_map.find(channel);
+
+		if (handlers_it != handlers_map.end()) {
+			HandlersVec & handlers = handlers_it->second;
+			for (auto it = handlers.begin(); it != handlers.end(); ++it) {
+				// stops when callback returns true
+				if ((*it)->exec(event)) {
+					break;
+				}
+			}
+		}
+	} else {
+		HandlersVec & handlers = this->subscribers[event_type];
+		for (auto it = handlers.begin(); it != handlers.end(); ++it) {
+			// stops when callback returns true
+			if ((*it)->exec(event)) {
+				break;
+			}
+		}
+	}
+}
+
+template <typename EventType>
+void EventManager::unsubscribe(const EventHandler<EventType> & callback,
+							   int channel) {
+	using HandlersMap = std::unordered_map<
+		int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
+	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
+
+	std::type_index event_type(typeid(EventType));
+	std::string handler_name = callback.target_type().name();
+
+	if (channel) {
+		auto subscriber_list = this->subscribers_by_event_id.find(event_type);
+		if (subscriber_list != this->subscribers_by_event_id.end()) {
+			HandlersMap & handlers_map = subscriber_list->second;
+			auto handlers = handlers_map.find(channel);
+			if (handlers != handlers_map.end()) {
+				HandlersVec & callbacks = handlers->second;
+				for (auto it = callbacks.begin(); it != callbacks.end(); ++it) {
+					if ((*it)->get_type() == handler_name) {
+						it = callbacks.erase(it);
+						return;
+					}
+				}
+			}
+		}
+	} else {
+		auto handlers_it = this->subscribers.find(event_type);
+		if (handlers_it != this->subscribers.end()) {
+			HandlersVec & handlers = handlers_it->second;
+			for (auto it = handlers.begin(); it != handlers.end(); ++it) {
+				if ((*it)->get_type() == handler_name) {
+					it = handlers.erase(it);
+					return;
+				}
+			}
+		}
+	}
+}
+
+} // namespace crepe
diff --git a/src/crepe/api/IKeyListener.cpp b/src/crepe/api/IKeyListener.cpp
new file mode 100644
index 0000000..cd255df
--- /dev/null
+++ b/src/crepe/api/IKeyListener.cpp
@@ -0,0 +1,70 @@
+#include "IKeyListener.h"
+
+using namespace crepe;
+
+// Constructor with default channel
+IKeyListener::IKeyListener()
+	: channel(0),
+	  active(true),
+	  event_manager(EventManager::get_instance()) {
+	this->subscribe_events();
+}
+
+// Constructor with specified channel
+IKeyListener::IKeyListener(int channel)
+	: channel(channel),
+	  active(true),
+	  event_manager(EventManager::get_instance()) {
+	this->subscribe_events();
+}
+
+// Destructor, unsubscribe events
+IKeyListener::~IKeyListener() { this->unsubscribe_events(); }
+
+// Subscribe to key events
+void IKeyListener::subscribe_events() {
+	key_pressed_handler = [this](const KeyPressEvent & event) {
+		return this->on_key_pressed(event);
+	};
+	key_released_handler = [this](const KeyReleaseEvent & event) {
+		return this->on_key_released(event);
+	};
+
+	event_manager.subscribe<KeyPressEvent>(std::move(this->key_pressed_handler),
+										   this->channel);
+	event_manager.subscribe<KeyReleaseEvent>(
+		std::move(this->key_released_handler), this->channel);
+}
+
+// Unsubscribe from key events
+void IKeyListener::unsubscribe_events() {
+	event_manager.unsubscribe<KeyPressEvent>(this->key_pressed_handler,
+											 this->channel);
+	event_manager.unsubscribe<KeyReleaseEvent>(this->key_released_handler,
+											   this->channel);
+}
+
+// Activate key listening
+void IKeyListener::activate_keys() {
+	if (this->active) {
+		return;
+	}
+	this->active = true;
+	this->subscribe_events();
+}
+
+// Deactivate key listening
+void IKeyListener::deactivate_keys() {
+	if (!this->active) {
+		return;
+	}
+	this->active = false;
+	this->unsubscribe_events();
+}
+
+// Set a new channel for key events
+void IKeyListener::set_channel(int channel) {
+	this->unsubscribe_events();
+	this->channel = channel;
+	this->subscribe_events();
+}
diff --git a/src/crepe/api/IKeyListener.h b/src/crepe/api/IKeyListener.h
new file mode 100644
index 0000000..e170120
--- /dev/null
+++ b/src/crepe/api/IKeyListener.h
@@ -0,0 +1,84 @@
+#pragma once
+
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventManager.h"
+
+namespace crepe {
+
+/**
+ * \class IKeyListener
+ * \brief Interface for keyboard event handling in the application.
+ */
+class IKeyListener {
+public:
+	/**
+     * \brief Constructs an IKeyListener with a specified channel.
+     * \param channel The channel ID for event handling.
+     */
+	IKeyListener(int channel);
+
+	/**
+     * \brief Default constructor for IKeyListener.
+     */
+	IKeyListener();
+
+	/**
+     * \brief Destructor.
+     */
+	virtual ~IKeyListener();
+
+	/**
+     * \brief Pure virtual function to handle key press events.
+     * \param event The key press event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_key_pressed(const KeyPressEvent & event) = 0;
+
+	/**
+     * \brief Pure virtual function to handle key release events.
+     * \param event The key release event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_key_released(const KeyReleaseEvent & event) = 0;
+
+	/**
+     * \brief Activates key listening.
+     */
+	void activate_keys();
+
+	/**
+     * \brief Deactivates key listening.
+     */
+	void deactivate_keys();
+
+	/**
+     * \brief Sets the channel ID for event handling.
+     * \param channel The channel ID to set.
+     */
+	void set_channel(int channel);
+
+protected:
+	/**
+     * \brief Subscribes to key events.
+     */
+	void subscribe_events();
+
+	/**
+     * \brief Unsubscribes from key events.
+     */
+	void unsubscribe_events();
+
+private:
+	//! Indicates whether key listening is active.
+	bool active = true;
+	//! Channel ID for event handling.
+	int channel = 0;
+	//! Key press event handler.
+	EventHandler<KeyPressEvent> key_pressed_handler;
+	//!< Key release event handler.
+	EventHandler<KeyReleaseEvent> key_released_handler;
+	EventManager & event_manager;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/IMouseListener.cpp b/src/crepe/api/IMouseListener.cpp
new file mode 100644
index 0000000..bfa49f8
--- /dev/null
+++ b/src/crepe/api/IMouseListener.cpp
@@ -0,0 +1,75 @@
+#include "IMouseListener.h"
+
+using namespace crepe;
+
+IMouseListener::IMouseListener(int channel)
+	: event_manager(EventManager::get_instance()),
+	  channel(channel) {
+	this->subscribe_events();
+}
+
+IMouseListener::IMouseListener() : event_manager(EventManager::get_instance()) {
+	this->subscribe_events();
+}
+
+IMouseListener::~IMouseListener() { this->unsubscribe_events(); }
+
+void IMouseListener::subscribe_events() {
+	// Define handler lambdas and subscribe them
+	mouse_click_handler = [this](const MouseClickEvent & event) {
+		return this->on_mouse_clicked(event);
+	};
+	mouse_press_handler = [this](const MousePressEvent & event) {
+		return this->on_mouse_pressed(event);
+	};
+	mouse_release_handler = [this](const MouseReleaseEvent & event) {
+		return this->on_mouse_released(event);
+	};
+	mouse_move_handler = [this](const MouseMoveEvent & event) {
+		return this->on_mouse_moved(event);
+	};
+
+	// Subscribe event handlers (no need for std::move)
+	event_manager.subscribe<MouseClickEvent>(std::move(mouse_click_handler),
+											 this->channel);
+	event_manager.subscribe<MousePressEvent>(std::move(mouse_press_handler),
+											 this->channel);
+	event_manager.subscribe<MouseReleaseEvent>(std::move(mouse_release_handler),
+											   this->channel);
+	event_manager.subscribe<MouseMoveEvent>(std::move(mouse_move_handler),
+											this->channel);
+}
+
+void IMouseListener::unsubscribe_events() {
+	// Unsubscribe event handlers
+	event_manager.unsubscribe<MouseClickEvent>(mouse_click_handler,
+											   this->channel);
+	event_manager.unsubscribe<MousePressEvent>(mouse_press_handler,
+											   this->channel);
+	event_manager.unsubscribe<MouseReleaseEvent>(mouse_release_handler,
+												 this->channel);
+	event_manager.unsubscribe<MouseMoveEvent>(mouse_move_handler,
+											  this->channel);
+}
+
+void IMouseListener::activate_mouse() {
+	if (this->active) {
+		return;
+	}
+	this->subscribe_events();
+	this->active = true;
+}
+
+void IMouseListener::deactivate_mouse() {
+	if (!this->active) {
+		return;
+	}
+	this->unsubscribe_events();
+	this->active = false;
+}
+
+void IMouseListener::set_channel(int channel) {
+	this->unsubscribe_events();
+	this->channel = channel;
+	this->subscribe_events();
+}
diff --git a/src/crepe/api/IMouseListener.h b/src/crepe/api/IMouseListener.h
new file mode 100644
index 0000000..37d2f00
--- /dev/null
+++ b/src/crepe/api/IMouseListener.h
@@ -0,0 +1,122 @@
+#pragma once
+
+#include "Event.h"
+#include "EventHandler.h"
+#include "EventManager.h"
+
+namespace crepe {
+
+/**
+ * \class IMouseListener
+ * \brief Interface for mouse event handling in the application.
+ */
+class IMouseListener {
+public:
+	/**
+     * \brief Default constructor.
+     */
+	IMouseListener();
+
+	/**
+     * \brief Constructs an IMouseListener with a specified channel.
+     * \param channel The channel ID for event handling.
+     */
+	IMouseListener(int channel);
+
+	/**
+     * \brief Destructor.
+     */
+	virtual ~IMouseListener();
+
+	/**
+     * \brief Copy constructor (deleted).
+     */
+	IMouseListener(const IMouseListener &) = delete;
+
+	/**
+     * \brief Copy assignment operator (deleted).
+     */
+	IMouseListener & operator=(const IMouseListener &) = delete;
+
+	/**
+     * \brief Move constructor (deleted).
+     */
+	IMouseListener(IMouseListener &&) = delete;
+
+	/**
+     * \brief Move assignment operator (deleted).
+     */
+	IMouseListener & operator=(IMouseListener &&) = delete;
+
+	/**
+     * \brief Handles a mouse click event.
+     * \param event The mouse click event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_clicked(const MouseClickEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse press event.
+     * \param event The mouse press event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_pressed(const MousePressEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse release event.
+     * \param event The mouse release event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_released(const MouseReleaseEvent & event) = 0;
+
+	/**
+     * \brief Handles a mouse move event.
+     * \param event The mouse move event to handle.
+     * \return True if the event was handled, false otherwise.
+     */
+	virtual bool on_mouse_moved(const MouseMoveEvent & event) = 0;
+
+	/**
+     * \brief Activates mouse listening.
+     */
+	void activate_mouse();
+
+	/**
+     * \brief Deactivates mouse listening.
+     */
+	void deactivate_mouse();
+
+	/**
+     * \brief Sets the channel ID for event handling.
+     * \param channel The channel ID to set.
+     */
+	void set_channel(int channel);
+
+protected:
+	/**
+     * \brief Subscribes to mouse events on the specified channel.
+     */
+	void subscribe_events();
+
+	/**
+     * \brief Unsubscribes from mouse events on the specified channel.
+     */
+	void unsubscribe_events();
+
+private:
+	//! Indicates whether mouse listening is active.
+	bool active = true;
+	//! Channel ID for event handling.
+	int channel = 0;
+	//! Mouse click event handler.
+	EventHandler<MouseClickEvent> mouse_click_handler;
+	//! Mouse press event handler.
+	EventHandler<MousePressEvent> mouse_press_handler;
+	//! Mouse release event handler.
+	EventHandler<MouseReleaseEvent> mouse_release_handler;
+	//! Mouse move event handler.
+	EventHandler<MouseMoveEvent> mouse_move_handler;
+	EventManager & event_manager;
+};
+
+} //namespace crepe
diff --git a/src/crepe/api/KeyCodes.h b/src/crepe/api/KeyCodes.h
new file mode 100644
index 0000000..feed0b2
--- /dev/null
+++ b/src/crepe/api/KeyCodes.h
@@ -0,0 +1,222 @@
+#pragma once
+
+//! \enum MouseButton
+//! \brief Enumeration for mouse button inputs, including standard and extended buttons.
+enum class MouseButton {
+	//! No mouse button input.
+	NONE = 0,
+	//! Left mouse button.
+	LEFT_MOUSE = 1,
+	//! Right mouse button.
+	RIGHT_MOUSE = 2,
+	//! Middle mouse button (scroll wheel press).
+	MIDDLE_MOUSE = 3,
+	//! First extended mouse button.
+	X1_MOUSE = 4,
+	//! Second extended mouse button.
+	X2_MOUSE = 5,
+	//! Scroll wheel upward movement.
+	SCROLL_UP = 6,
+	//! Scroll wheel downward movement.
+	SCROLL_DOWN = 7
+};
+
+//! \enum Keycode
+//! \brief Enumeration for keyboard key inputs, including printable characters, function keys, and keypad keys.
+enum class Keycode : int {
+	//! No key input.
+	NONE = 0,
+	//! Spacebar.
+	SPACE = 32,
+	//! Apostrophe (').
+	APOSTROPHE = 39,
+	//! Comma (,).
+	COMMA = 44,
+	//! Minus (-).
+	MINUS = 45,
+	//! Period (.).
+	PERIOD = 46,
+	//! Slash (/).
+	SLASH = 47,
+	//! Digit 0.
+	D0 = 48,
+	//! Digit 1.
+	D1 = 49,
+	//! Digit 2.
+	D2 = 50,
+	//! Digit 3.
+	D3 = 51,
+	//! Digit 4.
+	D4 = 52,
+	//! Digit 5.
+	D5 = 53,
+	//! Digit 6.
+	D6 = 54,
+	//! Digit 7.
+	D7 = 55,
+	//! Digit 8.
+	D8 = 56,
+	//! Digit 9.
+	D9 = 57,
+	//! Semicolon (;).
+	SEMICOLON = 59,
+	//! Equal sign (=).
+	EQUAL = 61,
+	//! Key 'A'.
+	A = 65,
+	//! Key 'B'.
+	B = 66,
+	//! Key 'C'.
+	C = 67,
+	//! Key 'D'.
+	D = 68,
+	//! Key 'E'.
+	E = 69,
+	//! Key 'F'.
+	F = 70,
+	//! Key 'G'.
+	G = 71,
+	//! Key 'H'.
+	H = 72,
+	//! Key 'I'.
+	I = 73,
+	//! Key 'J'.
+	J = 74,
+	//! Key 'K'.
+	K = 75,
+	//! Key 'L'.
+	L = 76,
+	//! Key 'M'.
+	M = 77,
+	//! Key 'N'.
+	N = 78,
+	//! Key 'O'.
+	O = 79,
+	//! Key 'P'.
+	P = 80,
+	//! Key 'Q'.
+	Q = 81,
+	//! Key 'R'.
+	R = 82,
+	//! Key 'S'.
+	S = 83,
+	//! Key 'T'.
+	T = 84,
+	//! Key 'U'.
+	U = 85,
+	//! Key 'V'.
+	V = 86,
+	//! Key 'W'.
+	W = 87,
+	//! Key 'X'.
+	X = 88,
+	//! Key 'Y'.
+	Y = 89,
+	//! Key 'Z'.
+	Z = 90,
+	//! Left bracket ([).
+	LEFT_BRACKET = 91,
+	//! Backslash (\).
+	BACKSLASH = 92,
+	//! Right bracket (]).
+	RIGHT_BRACKET = 93,
+	//! Grave accent (`).
+	GRAVE_ACCENT = 96,
+	//! Non-US key #1.
+	WORLD1 = 161,
+	//! Non-US key #2.
+	WORLD2 = 162,
+	//! Escape key.
+	ESCAPE = 256,
+	//! Enter key.
+	ENTER = 257,
+	//! Tab key.
+	TAB = 258,
+	//! Backspace key.
+	BACKSPACE = 259,
+	//! Insert key.
+	INSERT = 260,
+	//! Delete key.
+	DELETE = 261,
+	//! Right arrow key.
+	RIGHT = 262,
+	//! Left arrow key.
+	LEFT = 263,
+	//! Down arrow key.
+	DOWN = 264,
+	//! Up arrow key.
+	UP = 265,
+	//! Page Up key.
+	PAGE_UP = 266,
+	//! Page Down key.
+	PAGE_DOWN = 267,
+	//! Home key.
+	HOME = 268,
+	//! End key.
+	END = 269,
+	//! Caps Lock key.
+	CAPS_LOCK = 280,
+	//! Scroll Lock key.
+	SCROLL_LOCK = 281,
+	//! Num Lock key.
+	NUM_LOCK = 282,
+	//! Print Screen key.
+	PRINT_SCREEN = 283,
+	//! Pause key.
+	PAUSE = 284,
+	//! Function keys (F1-F25).
+	F1 = 290,
+	F2 = 291,
+	F3 = 292,
+	F4 = 293,
+	F5 = 294,
+	F6 = 295,
+	F7 = 296,
+	F8 = 297,
+	F9 = 298,
+	F10 = 299,
+	F11 = 300,
+	F12 = 301,
+	F13 = 302,
+	F14 = 303,
+	F15 = 304,
+	F16 = 305,
+	F17 = 306,
+	F18 = 307,
+	F19 = 308,
+	F20 = 309,
+	F21 = 310,
+	F22 = 311,
+	F23 = 312,
+	F24 = 313,
+	F25 = 314,
+	//! Keypad digits and operators.
+	KP0 = 320,
+	KP1 = 321,
+	KP2 = 322,
+	KP3 = 323,
+	KP4 = 324,
+	KP5 = 325,
+	KP6 = 326,
+	KP7 = 327,
+	KP8 = 328,
+	KP9 = 329,
+	KP_DECIMAL = 330,
+	KP_DIVIDE = 331,
+	KP_MULTIPLY = 332,
+	KP_SUBTRACT = 333,
+	KP_ADD = 334,
+	KP_ENTER = 335,
+	KP_EQUAL = 336,
+	//! Modifier keys.
+	LEFT_SHIFT = 340,
+	LEFT_CONTROL = 341,
+	LEFT_ALT = 342,
+	LEFT_SUPER = 343,
+	RIGHT_SHIFT = 344,
+	RIGHT_CONTROL = 345,
+	RIGHT_ALT = 346,
+	RIGHT_SUPER = 347,
+	//! Menu key.
+	MENU = 348
+};