17 files changed, 233 insertions, 279 deletions

diff --git a/src/crepe/api/BehaviorScript.cpp b/src/crepe/api/BehaviorScript.cpp
index d22afdf..af7572c 100644
--- a/src/crepe/api/BehaviorScript.cpp
+++ b/src/crepe/api/BehaviorScript.cpp
@@ -10,6 +10,6 @@ BehaviorScript::BehaviorScript(game_object_id_t id, Mediator & mediator)
 
 template <>
 BehaviorScript & GameObject::add_component<BehaviorScript>() {
-	ComponentManager & mgr = this->component_manager;
-	return mgr.add_component<BehaviorScript>(this->id, mgr.mediator);
+	ComponentManager & mgr = this->mediator.component_manager;
+	return mgr.add_component<BehaviorScript>(this->id, this->mediator);
 }
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
index 3909b96..02d588a 100644
--- a/src/crepe/api/BehaviorScript.h
+++ b/src/crepe/api/BehaviorScript.h
@@ -9,6 +9,7 @@
 namespace crepe {
 
 class ScriptSystem;
+class Mediator;
 class ComponentManager;
 class Script;
 
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index fb11c8d..48402ae 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -13,7 +13,7 @@ target_sources(crepe PUBLIC
 	Animator.cpp
 	BoxCollider.cpp
 	CircleCollider.cpp
-	LoopManager.cpp
+	Engine.cpp
 	Asset.cpp
 	EventHandler.cpp
 	Script.cpp
@@ -44,7 +44,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	EventHandler.h
 	EventHandler.hpp
 	Event.h
-	LoopManager.h
+	Engine.h
+	Engine.hpp
 	Asset.h
 	Button.h
 	UIObject.h
diff --git a/src/crepe/api/Engine.cpp b/src/crepe/api/Engine.cpp
new file mode 100644
index 0000000..7ae89b9
--- /dev/null
+++ b/src/crepe/api/Engine.cpp
@@ -0,0 +1,61 @@
+#include "../util/Log.h"
+
+#include "Engine.h"
+
+using namespace crepe;
+using namespace std;
+
+void Engine::start() {
+	try {
+		this->setup();
+	} catch (const exception & e) {
+		Log::logf(Log::Level::ERROR, "Uncaught exception in setup: {}\n", e.what());
+		return;
+	}
+
+	try {
+		this->loop();
+	} catch (const exception & e) {
+		Log::logf(Log::Level::ERROR, "Uncaught exception in main loop: {}\n", e.what());
+		this->event_manager.trigger_event<ShutDownEvent>();
+	}
+}
+
+void Engine::setup() {
+	this->game_running = true;
+	this->loop_timer.start();
+	this->scene_manager.load_next_scene();
+
+	this->event_manager.subscribe<ShutDownEvent>([this](const ShutDownEvent & event) {
+		this->game_running = false;
+
+		// propagate to possible user ShutDownEvent listeners
+		return false;
+	});
+}
+
+void Engine::loop() {
+	LoopTimerManager & timer = this->loop_timer;
+	SystemManager & systems = this->system_manager;
+
+	while (game_running) {
+		timer.update();
+
+		while (timer.get_lag() >= timer.get_fixed_delta_time()) {
+			try {
+				systems.fixed_update();
+			} catch (const exception & e) {
+				Log::logf(Log::Level::WARNING, "Uncaught exception in fixed update function: {}\n", e.what());
+			}
+			timer.advance_fixed_elapsed_time();
+		}
+
+		try {
+			systems.frame_update();
+		} catch (const exception & e) {
+			Log::logf(Log::Level::WARNING, "Uncaught exception in frame update function: {}\n", e.what());
+		}
+		timer.enforce_frame_rate();
+	}
+}
+
diff --git a/src/crepe/api/Engine.h b/src/crepe/api/Engine.h
new file mode 100644
index 0000000..5421d60
--- /dev/null
+++ b/src/crepe/api/Engine.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include "../facade/SDLContext.h"
+#include "../manager/ComponentManager.h"
+#include "../manager/ReplayManager.h"
+#include "../manager/ResourceManager.h"
+#include "../manager/ResourceManager.h"
+#include "../manager/SaveManager.h"
+#include "../manager/SceneManager.h"
+#include "../manager/SystemManager.h"
+#include "../manager/LoopTimerManager.h"
+#include "../manager/EventManager.h"
+
+namespace crepe {
+
+/**
+ * \brief Main game entrypoint
+ *
+ * This class is responsible for managing the game loop, including initialization and updating.
+ */
+class Engine {
+public:
+	void start();
+
+	/**
+	 * \brief Add a new concrete scene to the scene manager
+	 *
+	 * \tparam T  Type of concrete scene
+	 */
+	template <typename T>
+	void add_scene();
+
+private:
+	/**
+	 * \brief Setup function for one-time initialization.
+	 *
+	 * This function initializes necessary components for the game.
+	 */
+	void setup();
+	/**
+	 * \brief Main game loop function.
+	 *
+	 * This function runs the main loop, handling game updates and rendering.
+	 */
+	void loop();
+
+	bool game_running = false;
+
+private:
+	//! Global context
+	Mediator mediator;
+
+	//! Component manager instance
+	ComponentManager component_manager{mediator};
+	//! Scene manager instance
+	SceneManager scene_manager{mediator};
+	//! LoopTimerManager instance
+	LoopTimerManager loop_timer{mediator};
+	//! EventManager instance
+	EventManager event_manager{mediator};
+	//! Resource manager instance
+	ResourceManager resource_manager{mediator};
+	//! Save manager instance
+	SaveManager save_manager{mediator};
+	//! SDLContext instance
+	SDLContext sdl_context{mediator};
+	//! ReplayManager instance
+	ReplayManager replay_manager{mediator};
+	//! SystemManager
+	SystemManager system_manager{mediator};
+};
+
+} // namespace crepe
+
+#include "Engine.hpp"
diff --git a/src/crepe/api/Engine.hpp b/src/crepe/api/Engine.hpp
new file mode 100644
index 0000000..f2fdc0a
--- /dev/null
+++ b/src/crepe/api/Engine.hpp
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "Engine.h"
+
+namespace crepe {
+
+template <class T>
+void Engine::add_scene() {
+	this->scene_manager.add_scene<T>();
+}
+
+} // namespace crepe
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
index 9ef4682..68b074e 100644
--- a/src/crepe/api/GameObject.cpp
+++ b/src/crepe/api/GameObject.cpp
@@ -7,20 +7,16 @@
 using namespace crepe;
 using namespace std;
 
-GameObject::GameObject(ComponentManager & component_manager, game_object_id_t id,
+GameObject::GameObject(Mediator & mediator, game_object_id_t id,
 					   const std::string & name, const std::string & tag,
 					   const vec2 & position, double rotation, double scale)
 	: id(id),
-	  component_manager(component_manager) {
-
-	// Add Transform and Metadata components
-	ComponentManager & mgr = this->component_manager;
-	mgr.add_component<Transform>(this->id, position, rotation, scale);
-	mgr.add_component<Metadata>(this->id, name, tag);
-}
+	  mediator(mediator),
+		transform(mediator.component_manager->add_component<Transform>(this->id, position, rotation, scale)),
+		metadata(mediator.component_manager->add_component<Metadata>(this->id, name, tag)) { }
 
 void GameObject::set_parent(const GameObject & parent) {
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 
 	// Set parent on own Metadata component
 	RefVector<Metadata> this_metadata = mgr.get_components_by_id<Metadata>(this->id);
@@ -32,7 +28,7 @@ void GameObject::set_parent(const GameObject & parent) {
 }
 
 void GameObject::set_persistent(bool persistent) {
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 
 	mgr.set_persistent(this->id, persistent);
 }
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
index ff80f49..6203f81 100644
--- a/src/crepe/api/GameObject.h
+++ b/src/crepe/api/GameObject.h
@@ -6,7 +6,9 @@
 
 namespace crepe {
 
-class ComponentManager;
+class Mediator;
+class Transform;
+class Metadata;
 
 /**
  * \brief Represents a GameObject
@@ -20,7 +22,7 @@ private:
 	 * This constructor creates a new GameObject. It creates a new Transform and Metadata
 	 * component and adds them to the ComponentManager.
 	 *
-	 * \param component_manager Reference to component_manager
+	 * \param mediator Reference to mediator
 	 * \param id The id of the GameObject
 	 * \param name The name of the GameObject
 	 * \param tag The tag of the GameObject
@@ -28,13 +30,20 @@ private:
 	 * \param rotation The rotation of the GameObject
 	 * \param scale The scale of the GameObject
 	 */
-	GameObject(ComponentManager & component_manager, game_object_id_t id,
+	GameObject(Mediator & mediator, game_object_id_t id,
 			   const std::string & name, const std::string & tag, const vec2 & position,
 			   double rotation, double scale);
 	//! ComponentManager instances GameObject
 	friend class ComponentManager;
 
 public:
+	//! The id of the GameObject
+	const game_object_id_t id;
+
+	Transform & transform;
+	Metadata & metadata;
+
+public:
 	/**
 	 * \brief Set the parent of this GameObject
 	 *
@@ -68,12 +77,8 @@ public:
 	 */
 	void set_persistent(bool persistent = true);
 
-public:
-	//! The id of the GameObject
-	const game_object_id_t id;
-
 protected:
-	ComponentManager & component_manager;
+	Mediator & mediator;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/GameObject.hpp b/src/crepe/api/GameObject.hpp
index a6b45b0..69f7d73 100644
--- a/src/crepe/api/GameObject.hpp
+++ b/src/crepe/api/GameObject.hpp
@@ -8,7 +8,7 @@ namespace crepe {
 
 template <typename T, typename... Args>
 T & GameObject::add_component(Args &&... args) {
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 	return mgr.add_component<T>(this->id, std::forward<Args>(args)...);
 }
 
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
deleted file mode 100644
index b5e5ff7..0000000
--- a/src/crepe/api/LoopManager.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-#include "../facade/SDLContext.h"
-#include "../manager/EventManager.h"
-#include "../manager/LoopTimerManager.h"
-#include "../system/AISystem.h"
-#include "../system/AnimatorSystem.h"
-#include "../system/AudioSystem.h"
-#include "../system/CollisionSystem.h"
-#include "../system/InputSystem.h"
-#include "../system/ParticleSystem.h"
-#include "../system/PhysicsSystem.h"
-#include "../system/RenderSystem.h"
-#include "../system/ScriptSystem.h"
-#include "../util/Log.h"
-
-#include "LoopManager.h"
-
-using namespace crepe;
-using namespace std;
-
-LoopManager::LoopManager() {
-	this->load_system<AnimatorSystem>();
-	this->load_system<CollisionSystem>();
-	this->load_system<ParticleSystem>();
-	this->load_system<PhysicsSystem>();
-	this->load_system<RenderSystem>();
-	this->load_system<ScriptSystem>();
-	this->load_system<InputSystem>();
-	this->event_manager.subscribe<ShutDownEvent>(
-		[this](const ShutDownEvent & event) { return this->on_shutdown(event); });
-	this->load_system<AudioSystem>();
-	this->load_system<AISystem>();
-}
-void LoopManager::start() {
-	this->setup();
-	this->loop();
-}
-
-void LoopManager::setup() {
-	this->game_running = true;
-	this->loop_timer.start();
-	this->scene_manager.load_next_scene();
-}
-
-void LoopManager::loop() {
-	try {
-		while (game_running) {
-			this->loop_timer.update();
-
-			while (this->loop_timer.get_lag() >= this->loop_timer.get_fixed_delta_time()) {
-				this->fixed_update();
-				this->loop_timer.advance_fixed_elapsed_time();
-			}
-
-			this->frame_update();
-			this->loop_timer.enforce_frame_rate();
-		}
-	} catch (const exception & e) {
-		Log::logf(Log::Level::ERROR, "Exception caught in main loop: {}", e.what());
-		this->event_manager.trigger_event<ShutDownEvent>(ShutDownEvent{});
-	}
-}
-
-// will be called at a fixed interval
-void LoopManager::fixed_update() {
-	this->get_system<InputSystem>().update();
-	this->event_manager.dispatch_events();
-	this->get_system<ScriptSystem>().update();
-	this->get_system<AISystem>().update();
-	this->get_system<PhysicsSystem>().update();
-	this->get_system<CollisionSystem>().update();
-	this->get_system<AudioSystem>().update();
-}
-
-// will be called every frame
-void LoopManager::frame_update() {
-	this->scene_manager.load_next_scene();
-	this->get_system<AnimatorSystem>().update();
-	//render
-	this->get_system<RenderSystem>().update();
-}
-
-bool LoopManager::on_shutdown(const ShutDownEvent & e) {
-	this->game_running = false;
-	// propagate to possible user ShutDownEvent listeners
-	return false;
-}
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
deleted file mode 100644
index 40e6b38..0000000
--- a/src/crepe/api/LoopManager.h
+++ /dev/null
@@ -1,122 +0,0 @@
-#pragma once
-
-#include <memory>
-
-#include "../facade/SDLContext.h"
-#include "../manager/ComponentManager.h"
-#include "../manager/EventManager.h"
-#include "../manager/LoopTimerManager.h"
-#include "../manager/Mediator.h"
-#include "../manager/ResourceManager.h"
-#include "../manager/SaveManager.h"
-#include "../manager/SceneManager.h"
-#include "../system/System.h"
-
-namespace crepe {
-/**
- * \brief Main game loop manager
- *
- * This class is responsible for managing the game loop, including initialization and updating.
- */
-class LoopManager {
-public:
-	LoopManager();
-	/**
-	 * \brief Start the gameloop
-	 *
-	 * This is the start of the engine where the setup is called and then the loop keeps running until the game stops running.
-	 * The Game programmer needs to call this function to run the game. This should be done after creating and adding all scenes.
-	 */
-	void start();
-
-	/**
-	 * \brief Add a new concrete scene to the scene manager
-	 *
-	 * \tparam T  Type of concrete scene
-	 */
-	template <typename T>
-	void add_scene();
-
-private:
-	/**
-	 * \brief Setup function for one-time initialization.
-	 *
-	 * This function initializes necessary components for the game.
-	 */
-	void setup();
-	/**
-	 * \brief Main game loop function.
-	 *
-	 * This function runs the main loop, handling game updates and rendering.
-	 */
-	void loop();
-
-	/**
-	 * \brief Per-frame update.
-	 *
-	 * Updates the game state based on the elapsed time since the last frame.
-	 */
-	virtual void frame_update();
-
-	/**
-	 * \brief Fixed update executed at a fixed rate.
-	 *
-	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
-	 */
-	virtual void fixed_update();
-
-	//! Indicates whether the game is running.
-	bool game_running = false;
-
-private:
-	//! Global context
-	Mediator mediator;
-
-	//! Component manager instance
-	ComponentManager component_manager{mediator};
-	//! Scene manager instance
-	SceneManager scene_manager{mediator};
-	//! LoopTimerManager instance
-	LoopTimerManager loop_timer{mediator};
-	//! EventManager instance
-	EventManager event_manager{mediator};
-	//! Resource manager instance
-	ResourceManager resource_manager{mediator};
-	//! Save manager instance
-	SaveManager save_manager{mediator};
-	//! SDLContext instance
-	SDLContext sdl_context{mediator};
-
-private:
-	/**
-	 * \brief Callback function for ShutDownEvent
-	 *
-	 * This function sets the game_running variable to false, stopping the gameloop and therefor quitting the game.
-	 */
-	bool on_shutdown(const ShutDownEvent & e);
-	/**
-	 * \brief Collection of System instances
-	 *
-	 * This map holds System instances indexed by the system's class typeid. It is filled in the
-	 * constructor of LoopManager using LoopManager::load_system.
-	 */
-	std::unordered_map<std::type_index, std::unique_ptr<System>> systems;
-	/**
-	 * \brief Initialize a system
-	 * \tparam T System type (must be derivative of \c System)
-	 */
-	template <class T>
-	void load_system();
-	/**
-	 * \brief Retrieve a reference to ECS system
-	 * \tparam T System type
-	 * \returns Reference to system instance
-	 * \throws std::runtime_error if the System is not initialized
-	 */
-	template <class T>
-	T & get_system();
-};
-
-} // namespace crepe
-
-#include "LoopManager.hpp"
diff --git a/src/crepe/api/LoopManager.hpp b/src/crepe/api/LoopManager.hpp
deleted file mode 100644
index 266758a..0000000
--- a/src/crepe/api/LoopManager.hpp
+++ /dev/null
@@ -1,48 +0,0 @@
-#pragma once
-
-#include <cassert>
-#include <format>
-#include <memory>
-
-#include "../system/System.h"
-
-#include "LoopManager.h"
-
-namespace crepe {
-
-template <class T>
-void LoopManager::add_scene() {
-	this->scene_manager.add_scene<T>();
-}
-
-template <class T>
-T & LoopManager::get_system() {
-	using namespace std;
-	static_assert(is_base_of<System, T>::value,
-				  "get_system must recieve a derivative class of System");
-
-	const type_info & type = typeid(T);
-	if (!this->systems.contains(type))
-		throw runtime_error(format("LoopManager: {} is not initialized", type.name()));
-
-	System * system = this->systems.at(type).get();
-	T * concrete_system = dynamic_cast<T *>(system);
-	assert(concrete_system != nullptr);
-
-	return *concrete_system;
-}
-
-template <class T>
-void LoopManager::load_system() {
-	using namespace std;
-	static_assert(is_base_of<System, T>::value,
-				  "load_system must recieve a derivative class of System");
-
-	const type_info & type = typeid(T);
-	if (this->systems.contains(type))
-		throw runtime_error(format("LoopManager: {} is already initialized", type.name()));
-	System * system = new T(this->mediator);
-	this->systems[type] = unique_ptr<System>(system);
-}
-
-} // namespace crepe
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
index 753a9e3..8b95cc9 100644
--- a/src/crepe/api/Script.cpp
+++ b/src/crepe/api/Script.cpp
@@ -25,3 +25,24 @@ void Script::set_next_scene(const string & name) {
 }
 
 SaveManager & Script::get_save_manager() const { return this->mediator->save_manager; }
+
+void Script::replay::record_start() {
+	ReplayManager & mgr = this->mediator->replay_manager;
+	return mgr.record_start();
+}
+
+recording_t Script::replay::record_end() {
+	ReplayManager & mgr = this->mediator->replay_manager;
+	return mgr.record_end();
+}
+
+void Script::replay::play(recording_t recording) {
+	ReplayManager & mgr = this->mediator->replay_manager;
+	return mgr.play(recording);
+}
+
+void Script::replay::release(recording_t recording) {
+	ReplayManager & mgr = this->mediator->replay_manager;
+	return mgr.release(recording);
+}
+
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index 668e5d1..c797db0 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -2,6 +2,7 @@
 
 #include <vector>
 
+#include "../manager/ReplayManager.h"
 #include "../manager/EventManager.h"
 #include "../manager/Mediator.h"
 #include "../system/CollisionSystem.h"
@@ -135,6 +136,23 @@ protected:
 	//! Retrieve SaveManager reference
 	SaveManager & get_save_manager() const;
 
+	//! Replay management functions
+	struct replay { // NOLINT
+		//! \copydoc ReplayManager::record_start
+		void record_start();
+		//! \copydoc ReplayManager::record_end
+		recording_t record_end();
+		//! \copydoc ReplayManager::play
+		void play(recording_t);
+		//! \copydoc ReplayManager::release
+		void release(recording_t);
+
+	private:
+		OptionalRef<Mediator> & mediator;
+		replay(OptionalRef<Mediator> & mediator) : mediator(mediator) {}
+		friend class Script;
+	} replay{mediator};
+
 	//! \}
 
 private:
diff --git a/src/crepe/api/Script.hpp b/src/crepe/api/Script.hpp
index 225a51c..547fb8b 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "../manager/ComponentManager.h"
+#include "../manager/ReplayManager.h"
 
 #include "BehaviorScript.h"
 #include "Script.h"
@@ -36,6 +37,8 @@ void Script::subscribe_internal(const EventHandler<EventType> & callback,
 		[this, callback](const EventType & data) -> bool {
 			bool & active = this->active;
 			if (!active) return false;
+			ReplayManager & replay = this->mediator->replay_manager;
+			if (replay.get_state() == ReplayManager::PLAYING) return false;
 			return callback(data);
 		},
 		channel);
diff --git a/src/crepe/api/Transform.cpp b/src/crepe/api/Transform.cpp
index a85b792..5fc886b 100644
--- a/src/crepe/api/Transform.cpp
+++ b/src/crepe/api/Transform.cpp
@@ -3,6 +3,7 @@
 #include "Transform.h"
 
 using namespace crepe;
+using namespace std;
 
 Transform::Transform(game_object_id_t id, const vec2 & point, double rotation, double scale)
 	: Component(id),
@@ -11,3 +12,12 @@ Transform::Transform(game_object_id_t id, const vec2 & point, double rotation, d
 	  scale(scale) {
 	dbg_trace();
 }
+
+unique_ptr<Component> Transform::save() const {
+	return unique_ptr<Component>{new Transform(*this)};
+}
+
+void Transform::restore(const Component & snapshot) {
+	*this = static_cast<const Transform &>(snapshot);
+}
+
diff --git a/src/crepe/api/Transform.h b/src/crepe/api/Transform.h
index 7ee6d65..bbd23e0 100644
--- a/src/crepe/api/Transform.h
+++ b/src/crepe/api/Transform.h
@@ -35,6 +35,13 @@ protected:
 	virtual int get_instances_max() const { return 1; }
 	//! ComponentManager instantiates all components
 	friend class ComponentManager;
+
+protected:
+	virtual std::unique_ptr<Component> save() const;
+	Transform(const Transform &) = default;
+	virtual void restore(const Component & snapshot);
+	virtual Transform & operator=(const Transform &) = default;
+
 };
 
 } // namespace crepe